patch-2.4.22 linux-2.4.22/arch/ia64/sn/io/l1.c

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diff -urN linux-2.4.21/arch/ia64/sn/io/l1.c linux-2.4.22/arch/ia64/sn/io/l1.c
@@ -1,3143 +0,0 @@
-/* $Id$
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1992-1997, 2000-2002 Silicon Graphics, Inc.  All rights reserved.
- */
-
-/* In general, this file is organized in a hierarchy from lower-level
- * to higher-level layers, as follows:
- *
- *	UART routines
- *	Bedrock/L1 "PPP-like" protocol implementation
- *	System controller "message" interface (allows multiplexing
- *		of various kinds of requests and responses with
- *		console I/O)
- *	Console interface:
- *	  "l1_cons", the glue that allows the L1 to act
- *		as the system console for the stdio libraries
- *
- * Routines making use of the system controller "message"-style interface
- * can be found in l1_command.c.
- */
-
-
-#include <linux/types.h>
-#include <linux/config.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <asm/sn/sgi.h>
-#include <asm/sn/io.h>
-#include <asm/sn/iograph.h>
-#include <asm/sn/invent.h>
-#include <asm/sn/hcl.h>
-#include <asm/sn/hcl_util.h>
-#include <asm/sn/labelcl.h>
-#include <asm/sn/eeprom.h>
-#include <asm/sn/router.h>
-#include <asm/sn/module.h>
-#include <asm/sn/ksys/l1.h>
-#include <asm/sn/nodepda.h>
-#include <asm/sn/clksupport.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/sn/sn_cpuid.h>
-#include <asm/sn/uart16550.h>
-#include <asm/sn/simulator.h>
-
-#if defined(CONFIG_IA64_SGI_SN2)
-#define USE_SAL_CONSOLE_IO	1	/* DON'T un-def this for the simulator... */
-#endif
-
-/* Make all console writes atomic */
-#define SYNC_CONSOLE_WRITE	1
-
-
-/*********************************************************************
- * Hardware-level (UART) driver routines.
- */
-
-/* macros for reading/writing registers */
-
-#define LD(x)			(*(volatile uint64_t *)(x))
-#define SD(x, v)        	(LD(x) = (uint64_t) (v))
-
-/* location of uart receive/xmit data register */
-#if defined(CONFIG_IA64_SGI_SN1)
-#define L1_UART_BASE(n)		((ulong)REMOTE_HSPEC_ADDR((n), 0x00000080))
-#define LOCK_HUB		REMOTE_HUB_ADDR
-#elif defined(CONFIG_IA64_SGI_SN2)
-#define L1_UART_BASE(n)		((ulong)REMOTE_HUB((n), SH_JUNK_BUS_UART0))
-#define LOCK_HUB		REMOTE_HUB
-typedef u64 rtc_time_t;
-#endif
-
-
-#define ADDR_L1_REG(n, r)	( L1_UART_BASE(n) | ( (r) << 3 ) )
-#define READ_L1_UART_REG(n, r)	( LD(ADDR_L1_REG((n), (r))) )
-#define WRITE_L1_UART_REG(n, r, v) ( SD(ADDR_L1_REG((n), (r)), (v)) )
-
-/* upper layer interface calling methods */
-#define SERIAL_INTERRUPT_MODE	0
-#define SERIAL_POLLED_MODE	1
-
-
-/* UART-related #defines */
-
-#define UART_BAUD_RATE		57600
-#define UART_FIFO_DEPTH		16
-#define UART_DELAY_SPAN		10
-#define UART_PUTC_TIMEOUT	50000
-#define UART_INIT_TIMEOUT	100000
-
-/* error codes */
-#define UART_SUCCESS		  0
-#define UART_TIMEOUT		(-1)
-#define UART_LINK		(-2)
-#define UART_NO_CHAR		(-3)
-#define UART_VECTOR		(-4)
-
-#define UART_DELAY(x)		udelay(x)
-
-/* Some debug counters */
-#define L1C_INTERRUPTS		0
-#define L1C_OUR_R_INTERRUPTS	1
-#define L1C_OUR_X_INTERRUPTS	2
-#define L1C_SEND_CALLUPS	3
-#define L1C_RECEIVE_CALLUPS	4
-#define L1C_SET_BAUD		5
-#define L1C_ALREADY_LOCKED	L1C_SET_BAUD
-#define L1C_R_IRQ		6
-#define L1C_R_IRQ_RET		7
-#define L1C_LOCK_TIMEOUTS	8
-#define L1C_LOCK_COUNTER	9
-#define L1C_UNLOCK_COUNTER	10
-#define L1C_REC_STALLS		11
-#define L1C_CONNECT_CALLS	12
-#define L1C_SIZE		L1C_CONNECT_CALLS	/* Set to the last one */
-
-uint64_t L1_collectibles[L1C_SIZE + 1];
-
-
-/*
- *	Some macros for handling Endian-ness
- */
-
-#define COPY_INT_TO_BUFFER(_b, _i, _n)		\
-	{					\
-		_b[_i++] = (_n >> 24) & 0xff;	\
-		_b[_i++] = (_n >> 16) & 0xff;	\
-		_b[_i++] = (_n >>  8) & 0xff;	\
-		_b[_i++] =  _n        & 0xff;	\
-	}
-
-#define COPY_BUFFER_TO_INT(_b, _i, _n)		\
-	{					\
-		_n  = (_b[_i++] << 24) & 0xff;	\
-		_n |= (_b[_i++] << 16) & 0xff;	\
-		_n |= (_b[_i++] <<  8) & 0xff;	\
-		_n |=  _b[_i++]        & 0xff;	\
-	}
-
-#define COPY_BUFFER_TO_BUFFER(_b, _i, _bn)	\
-	{					\
-	    char *_xyz = (char *)_bn;		\
-	    _xyz[3] = _b[_i++];			\
-	    _xyz[2] = _b[_i++];			\
-	    _xyz[1] = _b[_i++];			\
-	    _xyz[0] = _b[_i++];			\
-	}
-
-void snia_kmem_free(void *where, int size);
-
-#define ALREADY_LOCKED		1
-#define NOT_LOCKED		0
-static int early_l1_serial_out(nasid_t, char *, int, int /* defines above*/ );
-
-#define BCOPY(x,y,z)	memcpy(y,x,z)
-
-uint8_t L1_interrupts_connected;		/* Non-zero when we are in interrupt mode */
-
-
-/*
- * Console locking defines and functions.
- *
- */
-
-uint8_t L1_cons_is_inited = 0;			/* non-zero when console is init'd */
-nasid_t Master_console_nasid = (nasid_t)-1;
-extern nasid_t console_nasid;
-
-#if defined(CONFIG_IA64_SGI_SN1)
-u64 ia64_sn_get_console_nasid(void);
-#endif
-
-inline nasid_t
-get_master_nasid(void)
-{
-#if defined(CONFIG_IA64_SGI_SN1)
-	nasid_t nasid = Master_console_nasid;
-
-	if ( nasid == (nasid_t)-1 ) {
-		nasid = (nasid_t)ia64_sn_get_console_nasid();
-		if ( (nasid < 0) || (nasid >= MAX_NASIDS) ) {
-			/* Out of bounds, use local */
-			console_nasid = nasid = get_nasid();
-		}
-		else {
-			/* Got a valid nasid, set the console_nasid */
-			char xx[100];
-/* zzzzzz - force nasid to 0 for now */
-			sprintf(xx, "Master console is set to nasid %d (%d)\n", 0, (int)nasid);
-nasid = 0;
-/* end zzzzzz */
-			xx[99] = (char)0;
-			early_l1_serial_out(nasid, xx, strlen(xx), NOT_LOCKED);
-			Master_console_nasid = console_nasid = nasid;
-		}
-	}
-	return(nasid);
-#else
-	return((nasid_t)0);
-#endif	/* CONFIG_IA64_SGI_SN1 */
-}
-
-
-#if defined(CONFIG_IA64_SGI_SN1)
-
-#define HUB_LOCK		16
-
-#define PRIMARY_LOCK_TIMEOUT    10000000
-#define HUB_LOCK_REG(n)         LOCK_HUB(n, MD_PERF_CNT0)
-
-#define SET_BITS(reg, bits)     SD(reg, LD(reg) |  (bits))
-#define CLR_BITS(reg, bits)     SD(reg, LD(reg) & ~(bits))
-#define TST_BITS(reg, bits)     ((LD(reg) & (bits)) != 0)
-
-#define HUB_TEST_AND_SET(n)	LD(LOCK_HUB(n,LB_SCRATCH_REG3_RZ))
-#define HUB_CLEAR(n)		SD(LOCK_HUB(n,LB_SCRATCH_REG3),0)
-
-#define RTC_TIME_MAX		((rtc_time_t) ~0ULL)
-
-/*
- * primary_lock
- *
- *   Allows CPU's 0-3  to mutually exclude the hub from one another by
- *   obtaining a blocking lock.  Does nothing if only one CPU is active.
- *
- *   This lock should be held just long enough to set or clear a global
- *   lock bit.  After a relatively short timeout period, this routine
- *   figures something is wrong, and steals the lock. It does not set
- *   any other CPU to "dead".
- */
-inline void
-primary_lock(nasid_t nasid)
-{
-	rtc_time_t          expire;
-
-	expire = rtc_time() + PRIMARY_LOCK_TIMEOUT;
-
-	while (HUB_TEST_AND_SET(nasid)) {
-		if (rtc_time() > expire) {
-			HUB_CLEAR(nasid);
-		}
-	}
-}
-
-/*
- * primary_unlock (internal)
- *
- *   Counterpart to primary_lock
- */
-
-inline void
-primary_unlock(nasid_t nasid)
-{
-	HUB_CLEAR(nasid);
-}
-
-/*
- * hub_unlock
- *
- *   Counterpart to hub_lock_timeout and hub_lock
- */
-
-inline void
-hub_unlock(nasid_t nasid, int level)
-{
-	uint64_t mask = 1ULL << level;
-
-	primary_lock(nasid);
-	CLR_BITS(HUB_LOCK_REG(nasid), mask);
-	primary_unlock(nasid);
-}
-
-/*
- * hub_lock_timeout
- *
- *   Uses primary_lock to implement multiple lock levels.
- *
- *   There are 20 lock levels from 0 to 19 (limited by the number of bits
- *   in HUB_LOCK_REG).  To prevent deadlock, multiple locks should be
- *   obtained in order of increasingly higher level, and released in the
- *   reverse order.
- *
- *   A timeout value of 0 may be used for no timeout.
- *
- *   Returns 0 if successful, -1 if lock times out.
- */
-
-inline int
-hub_lock_timeout(nasid_t nasid, int level, rtc_time_t timeout)
-{
-	uint64_t mask = 1ULL << level;
-	rtc_time_t expire = (timeout ?  rtc_time() + timeout : RTC_TIME_MAX);
-	int done    = 0;
-
-	while (! done) {
-		while (TST_BITS(HUB_LOCK_REG(nasid), mask)) {
-			if (rtc_time() > expire)
-				return -1;
-		}
-
-		primary_lock(nasid);
-
-		if (! TST_BITS(HUB_LOCK_REG(nasid), mask)) {
-			SET_BITS(HUB_LOCK_REG(nasid), mask);
-			done = 1;
-		}
-		primary_unlock(nasid);
-	}
-	return 0;
-}
-
-
-#define LOCK_TIMEOUT	(0x1500000 * 1) /* 0x1500000 is ~30 sec */
-
-void
-lock_console(nasid_t nasid)
-{
-	int ret;
-
-	/* If we already have it locked, just return */
-	L1_collectibles[L1C_LOCK_COUNTER]++;
-
-	ret = hub_lock_timeout(nasid, HUB_LOCK, (rtc_time_t)LOCK_TIMEOUT);
-	if ( ret != 0 ) {
-		L1_collectibles[L1C_LOCK_TIMEOUTS]++;
-		/* timeout */
-		hub_unlock(nasid, HUB_LOCK);
-		/* If the 2nd lock fails, just pile ahead.... */
-		hub_lock_timeout(nasid, HUB_LOCK, (rtc_time_t)LOCK_TIMEOUT);
-		L1_collectibles[L1C_LOCK_TIMEOUTS]++;
-	}
-}
-
-inline void
-unlock_console(nasid_t nasid)
-{
-	L1_collectibles[L1C_UNLOCK_COUNTER]++;
-	hub_unlock(nasid, HUB_LOCK);
-}
-
-#else /* SN2 */
-inline void lock_console(nasid_t n)	{}
-inline void unlock_console(nasid_t n)	{}
-
-#endif	/* CONFIG_IA64_SGI_SN1 */
-
-int 
-get_L1_baud(void)
-{
-    return UART_BAUD_RATE;
-}
-
-
-/* uart driver functions */
-
-static inline void
-uart_delay( rtc_time_t delay_span )
-{
-    UART_DELAY( delay_span );
-}
-
-#define UART_PUTC_READY(n)      (READ_L1_UART_REG((n), REG_LSR) & LSR_XHRE)
-
-static int
-uart_putc( l1sc_t *sc ) 
-{
-    WRITE_L1_UART_REG( sc->nasid, REG_DAT, sc->send[sc->sent] );
-    return UART_SUCCESS;
-}
-
-
-static int
-uart_getc( l1sc_t *sc )
-{
-    u_char lsr_reg = 0;
-    nasid_t nasid = sc->nasid;
-
-    if( (lsr_reg = READ_L1_UART_REG( nasid, REG_LSR )) & 
-	(LSR_RCA | LSR_PARERR | LSR_FRMERR) ) 
-    {
-	if( lsr_reg & LSR_RCA ) 
-	    return( (u_char)READ_L1_UART_REG( nasid, REG_DAT ) );
-	else if( lsr_reg & (LSR_PARERR | LSR_FRMERR) ) {
-	    return UART_LINK;
-	}
-    }
-
-    return UART_NO_CHAR;
-}
-
-
-#define PROM_SER_CLK_SPEED	12000000
-#define PROM_SER_DIVISOR(x)	(PROM_SER_CLK_SPEED / ((x) * 16))
-
-static void
-uart_init( l1sc_t *sc, int baud )
-{
-    rtc_time_t expire;
-    int clkdiv;
-    nasid_t nasid;
-
-    clkdiv = PROM_SER_DIVISOR(baud);
-    expire = rtc_time() + UART_INIT_TIMEOUT;
-    nasid = sc->nasid;
-    
-    /* make sure the transmit FIFO is empty */
-    while( !(READ_L1_UART_REG( nasid, REG_LSR ) & LSR_XSRE) ) {
-	uart_delay( UART_DELAY_SPAN );
-	if( rtc_time() > expire ) {
-	    break;
-	}
-    }
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	lock_console(nasid);
-
-    /* Setup for the proper baud rate */
-    WRITE_L1_UART_REG( nasid, REG_LCR, LCR_DLAB );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_L1_UART_REG( nasid, REG_DLH, (clkdiv >> 8) & 0xff );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_L1_UART_REG( nasid, REG_DLL, clkdiv & 0xff );
-	uart_delay( UART_DELAY_SPAN );
-
-    /* set operating parameters and set DLAB to 0 */
-
-    /* 8bit, one stop, clear request to send, auto flow control */
-    WRITE_L1_UART_REG( nasid, REG_LCR, LCR_BITS8 | LCR_STOP1 );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_L1_UART_REG( nasid, REG_MCR, MCR_RTS | MCR_AFE );
-	uart_delay( UART_DELAY_SPAN );
-
-    /* disable interrupts */
-    WRITE_L1_UART_REG( nasid, REG_ICR, 0x0 );
-	uart_delay( UART_DELAY_SPAN );
-
-    /* enable FIFO mode and reset both FIFOs, trigger on 1 */
-    WRITE_L1_UART_REG( nasid, REG_FCR, FCR_FIFOEN );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_L1_UART_REG( nasid, REG_FCR, FCR_FIFOEN | FCR_RxFIFO | FCR_TxFIFO | RxLVL0);
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	unlock_console(nasid);
-}
-
-/* This requires the console lock */
-
-#if	defined(CONFIG_IA64_SGI_SN1)
-
-static void
-uart_intr_enable( l1sc_t *sc, u_char mask )
-{
-    u_char lcr_reg, icr_reg;
-    nasid_t nasid = sc->nasid;
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	lock_console(nasid);
-
-    /* make sure that the DLAB bit in the LCR register is 0
-     */
-    lcr_reg = READ_L1_UART_REG( nasid, REG_LCR );
-    lcr_reg &= ~(LCR_DLAB);
-    WRITE_L1_UART_REG( nasid, REG_LCR, lcr_reg );
-
-    /* enable indicated interrupts
-     */
-    icr_reg = READ_L1_UART_REG( nasid, REG_ICR );
-    icr_reg |= mask;
-    WRITE_L1_UART_REG( nasid, REG_ICR, icr_reg /*(ICR_RIEN | ICR_TIEN)*/ );
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	unlock_console(nasid);
-}
-
-/* This requires the console lock */
-static void
-uart_intr_disable( l1sc_t *sc, u_char mask )
-{
-    u_char lcr_reg, icr_reg;
-    nasid_t nasid = sc->nasid;
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	lock_console(nasid);
-
-    /* make sure that the DLAB bit in the LCR register is 0
-     */
-    lcr_reg = READ_L1_UART_REG( nasid, REG_LCR );
-    lcr_reg &= ~(LCR_DLAB);
-    WRITE_L1_UART_REG( nasid, REG_LCR, lcr_reg );
-
-    /* enable indicated interrupts
-     */
-    icr_reg = READ_L1_UART_REG( nasid, REG_ICR );
-    icr_reg &= mask;
-    WRITE_L1_UART_REG( nasid, REG_ICR, icr_reg /*(ICR_RIEN | ICR_TIEN)*/ );
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	unlock_console(nasid);
-}
-#endif	/* CONFIG_IA64_SGI_SN1 */
-
-#define uart_enable_xmit_intr(sc) \
-	uart_intr_enable((sc), ICR_TIEN)
-
-#define uart_disable_xmit_intr(sc) \
-        uart_intr_disable((sc), ~(ICR_TIEN))
-
-#define uart_enable_recv_intr(sc) \
-        uart_intr_enable((sc), ICR_RIEN)
-
-#define uart_disable_recv_intr(sc) \
-        uart_intr_disable((sc), ~(ICR_RIEN))
-
-
-/*********************************************************************
- * Routines for accessing a remote (router) UART
- */
-
-#define READ_RTR_L1_UART_REG(p, n, r, v)		\
-    {							\
-	if( vector_read_node( (p), (n), 0,		\
-			      RR_JBUS1(r), (v) ) ) {	\
-	    return UART_VECTOR;				\
-	}						\
-    }
-
-#define WRITE_RTR_L1_UART_REG(p, n, r, v)		\
-    {							\
-	if( vector_write_node( (p), (n), 0,		\
-			       RR_JBUS1(r), (v) ) ) {	\
-	    return UART_VECTOR;				\
-	}						\
-    }
-
-#define RTR_UART_PUTC_TIMEOUT	UART_PUTC_TIMEOUT*10
-#define RTR_UART_DELAY_SPAN	UART_DELAY_SPAN
-#define RTR_UART_INIT_TIMEOUT	UART_INIT_TIMEOUT*10
-
-static int
-rtr_uart_putc( l1sc_t *sc )
-{
-    uint64_t regval, c;
-    nasid_t nasid = sc->nasid;
-    net_vec_t path = sc->uart;
-    rtc_time_t expire = rtc_time() + RTR_UART_PUTC_TIMEOUT;
-
-    c = (sc->send[sc->sent] & 0xffULL);
-    
-    while( 1 ) 
-    {
-        /* Check for "tx hold reg empty" bit. */
-	READ_RTR_L1_UART_REG( path, nasid, REG_LSR, &regval );
-	if( regval & LSR_XHRE )
-	{
-	    WRITE_RTR_L1_UART_REG( path, nasid, REG_DAT, c );
-	    return UART_SUCCESS;
-	}
-
-	if( rtc_time() >= expire ) 
-	{
-	    return UART_TIMEOUT;
-	}
-	uart_delay( RTR_UART_DELAY_SPAN );
-    }
-}
-
-
-static int
-rtr_uart_getc( l1sc_t *sc )
-{
-    uint64_t regval;
-    nasid_t nasid = sc->nasid;
-    net_vec_t path = sc->uart;
-
-    READ_RTR_L1_UART_REG( path, nasid, REG_LSR, &regval );
-    if( regval & (LSR_RCA | LSR_PARERR | LSR_FRMERR) )
-    {
-	if( regval & LSR_RCA )
-	{
-	    READ_RTR_L1_UART_REG( path, nasid, REG_DAT, &regval );
-	    return( (int)regval );
-	}
-	else
-	{
-	    return UART_LINK;
-	}
-    }
-
-    return UART_NO_CHAR;
-}
-
-
-static int
-rtr_uart_init( l1sc_t *sc, int baud )
-{
-    rtc_time_t expire;
-    int clkdiv;
-    nasid_t nasid;
-    net_vec_t path;
-    uint64_t regval;
-
-    clkdiv = PROM_SER_DIVISOR(baud);
-    expire = rtc_time() + RTR_UART_INIT_TIMEOUT;
-    nasid = sc->nasid;
-    path = sc->uart;
-
-    /* make sure the transmit FIFO is empty */
-    while(1) {
-	READ_RTR_L1_UART_REG( path, nasid, REG_LSR, &regval );
-	if( regval & LSR_XSRE ) {
-	    break;
-	}
-	if( rtc_time() > expire ) {
-	    break;
-	}
-	uart_delay( RTR_UART_DELAY_SPAN );
-    }
-
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_LCR, LCR_DLAB  );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_DLH, (clkdiv >> 8) & 0xff  );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_DLL, clkdiv & 0xff  );
-	uart_delay( UART_DELAY_SPAN );
-
-    /* set operating parameters and set DLAB to 0 */
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_LCR, LCR_BITS8 | LCR_STOP1  );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_MCR, MCR_RTS | MCR_AFE  );
-	uart_delay( UART_DELAY_SPAN );
-
-    /* disable interrupts */
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_ICR, 0x0  );
-	uart_delay( UART_DELAY_SPAN );
-
-    /* enable FIFO mode and reset both FIFOs */
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_FCR, FCR_FIFOEN  );
-	uart_delay( UART_DELAY_SPAN );
-    WRITE_RTR_L1_UART_REG( path, nasid, REG_FCR,
-	FCR_FIFOEN | FCR_RxFIFO | FCR_TxFIFO );
-
-    return 0;
-}
-
-/*********************************************************************
- * locking macros 
- */
-
-#define L1SC_SEND_LOCK(l,p)   { if ((l)->uart == BRL1_LOCALHUB_UART) spin_lock_irqsave(&((l)->send_lock),p); }
-#define L1SC_SEND_UNLOCK(l,p) { if ((l)->uart == BRL1_LOCALHUB_UART) spin_unlock_irqrestore(&((l)->send_lock), p); }
-#define L1SC_RECV_LOCK(l,p)   { if ((l)->uart == BRL1_LOCALHUB_UART) spin_lock_irqsave(&((l)->recv_lock), p); } 
-#define L1SC_RECV_UNLOCK(l,p) { if ((l)->uart == BRL1_LOCALHUB_UART) spin_unlock_irqrestore(&((l)->recv_lock), p); }
-
-
-/*********************************************************************
- * subchannel manipulation 
- *
- * The SUBCH_[UN]LOCK macros are used to arbitrate subchannel
- * allocation.  SUBCH_DATA_[UN]LOCK control access to data structures
- * associated with particular subchannels (e.g., receive queues).
- *
- */
-#define SUBCH_LOCK(sc, p)		spin_lock_irqsave( &((sc)->subch_lock), p )
-#define SUBCH_UNLOCK(sc, p)		spin_unlock_irqrestore( &((sc)->subch_lock), p )
-#define SUBCH_DATA_LOCK(sbch, p) 	spin_lock_irqsave( &((sbch)->data_lock), p )
-#define SUBCH_DATA_UNLOCK(sbch, p)	spin_unlock_irqrestore( &((sbch)->data_lock), p )
-
-
-/*
- * set a function to be called for subchannel ch in the event of
- * a transmission low-water interrupt from the uart
- */
-void
-subch_set_tx_notify( l1sc_t *sc, int ch, brl1_notif_t func )
-{
-    unsigned long pl = 0;
-
-    L1SC_SEND_LOCK( sc, pl );
-#if	!defined(SYNC_CONSOLE_WRITE)
-    if ( func && !sc->send_in_use )
-	uart_enable_xmit_intr( sc );
-#endif
-    sc->subch[ch].tx_notify = func;
-    L1SC_SEND_UNLOCK(sc, pl );
-}
-
-/*
- * set a function to be called for subchannel ch when data is received
- */
-void
-subch_set_rx_notify( l1sc_t *sc, int ch, brl1_notif_t func )
-{
-    unsigned long pl = 0;
-    brl1_sch_t *subch = &(sc->subch[ch]);
-
-    SUBCH_DATA_LOCK( subch, pl );
-    sc->subch[ch].rx_notify = func;
-    SUBCH_DATA_UNLOCK( subch, pl );
-}
-
-/*********************************************************************
- * Queue manipulation macros
- *
- *
- */
-#define NEXT(p)         (((p) + 1) & (BRL1_QSIZE-1)) /* assume power of 2 */
-
-#define cq_init(q)      bzero((q), sizeof (*(q)))
-#define cq_empty(q)     ((q)->ipos == (q)->opos)
-#define cq_full(q)      (NEXT((q)->ipos) == (q)->opos)
-#define cq_used(q)      ((q)->opos <= (q)->ipos ?                       \
-                         (q)->ipos - (q)->opos :                        \
-                         BRL1_QSIZE + (q)->ipos - (q)->opos)
-#define cq_room(q)      ((q)->opos <= (q)->ipos ?                       \
-                         BRL1_QSIZE - 1 + (q)->opos - (q)->ipos :       \
-                         (q)->opos - (q)->ipos - 1)
-#define cq_add(q, c)    ((q)->buf[(q)->ipos] = (u_char) (c),            \
-                         (q)->ipos = NEXT((q)->ipos))
-#define cq_rem(q, c)    ((c) = (q)->buf[(q)->opos],                     \
-                         (q)->opos = NEXT((q)->opos))
-#define cq_discard(q)	((q)->opos = NEXT((q)->opos))
-
-#define cq_tent_full(q)	(NEXT((q)->tent_next) == (q)->opos)
-#define cq_tent_len(q)	((q)->ipos <= (q)->tent_next ?			\
-			 (q)->tent_next - (q)->ipos :			\
-			 BRL1_QSIZE + (q)->tent_next - (q)->ipos)
-#define cq_tent_add(q, c)						\
-			((q)->buf[(q)->tent_next] = (u_char) (c),	\
-			 (q)->tent_next = NEXT((q)->tent_next))
-#define cq_commit_tent(q)						\
-			((q)->ipos = (q)->tent_next)
-#define cq_discard_tent(q)						\
-			((q)->tent_next = (q)->ipos)
-
-
-
-
-/*********************************************************************
- * CRC-16 (for checking bedrock/L1 packets).
- *
- * These are based on RFC 1662 ("PPP in HDLC-like framing").
- */
-
-static unsigned short fcstab[256] = {
-      0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
-      0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
-      0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
-      0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
-      0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
-      0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
-      0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
-      0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
-      0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
-      0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
-      0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
-      0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
-      0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
-      0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
-      0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
-      0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
-      0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
-      0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
-      0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
-      0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
-      0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
-      0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
-      0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
-      0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
-      0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
-      0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
-      0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
-      0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
-      0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
-      0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
-      0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
-      0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
-};
-
-#define INIT_CRC	0xFFFF	/* initial CRC value	  */
-#define	GOOD_CRC	0xF0B8	/* "good" final CRC value */
-
-static unsigned short crc16_calc( unsigned short crc, u_char c )
-{
-    return( (crc >> 8) ^ fcstab[(crc ^ c) & 0xff] );
-}
-
-
-/***********************************************************************
- * The following functions implement the PPP-like bedrock/L1 protocol
- * layer.
- *
- */
-
-#define BRL1_FLAG_CH	0x7e
-#define BRL1_ESC_CH	0x7d
-#define BRL1_XOR_CH	0x20
-
-/* L1<->Bedrock packet types */
-#define BRL1_REQUEST    0x00
-#define BRL1_RESPONSE   0x20
-#define BRL1_EVENT      0x40
-
-#define BRL1_PKT_TYPE_MASK      0xE0
-#define BRL1_SUBCH_MASK         0x1F
-
-#define PKT_TYPE(tsb)   ((tsb) & BRL1_PKT_TYPE_MASK)
-#define SUBCH(tsb)	((tsb) & BRL1_SUBCH_MASK)
-
-/* timeouts */
-#define BRL1_INIT_TIMEOUT	500000
-
-/*
- * brl1_discard_packet is a dummy "receive callback" used to get rid
- * of packets we don't want
- */
-void brl1_discard_packet( int dummy0, void *dummy1, struct pt_regs *dummy2, l1sc_t *sc, int ch )
-{
-    unsigned long pl = 0;
-    brl1_sch_t *subch = &sc->subch[ch];
-
-    sc_cq_t *q = subch->iqp;
-    SUBCH_DATA_LOCK( subch, pl );
-    q->opos = q->ipos;
-    atomic_set(&(subch->packet_arrived), 0);
-    SUBCH_DATA_UNLOCK( subch, pl );
-}
-
-
-/*
- * brl1_send_chars sends the send buffer in the l1sc_t structure
- * out through the uart.  Assumes that the caller has locked the
- * UART (or send buffer in the kernel).
- *
- * This routine doesn't block-- if you want it to, call it in
- * a loop.
- */
-static int
-brl1_send_chars( l1sc_t *sc )
-{
-    /* We track the depth of the C brick's UART's
-     * fifo in software, and only check if the UART is accepting
-     * characters when our count indicates that the fifo should
-     * be full.
-     *
-     * For remote (router) UARTs, we check with the UART before sending every
-     * character.
-     */
-    if( sc->uart == BRL1_LOCALHUB_UART ) {
-	if( !(sc->fifo_space) && UART_PUTC_READY( sc->nasid ) )
-	    sc->fifo_space = UART_FIFO_DEPTH;
-	
-	while( (sc->sent < sc->send_len) && (sc->fifo_space) ) {
-	    uart_putc( sc );
-	    sc->fifo_space--;
-	    sc->sent++;
-	}
-    }
-    else {
-
-	/* remote (router) UARTs */
-
-	int result;
-	int tries = 0;
-
-	while( sc->sent < sc->send_len ) {
-	    result = sc->putc_f( sc );
-	    if( result >= 0 ) {
-		(sc->sent)++;
-		continue;
-	    }
-	    if( result == UART_TIMEOUT ) {
-		tries++;
-		/* send this character in TIMEOUT_RETRIES... */
-		if( tries < 30 /* TIMEOUT_RETRIES */ ) {
-		    continue;
-		}
-		/* ...or else... */
-		else {
-		    /* ...drop the packet. */
-		    sc->sent = sc->send_len;
-		    return sc->send_len;
-		}
-	    }
-	    if( result < 0 ) {
-		return result;
-	    }
-	}
-    }
-    return sc->sent;
-}
-
-
-/* brl1_send formats up a packet and (at least begins to) send it
- * to the uart.  If the send buffer is in use when this routine obtains
- * the lock, it will behave differently depending on the "wait" parameter.
- * For wait == 0 (most I/O), it will return 0 (as in "zero bytes sent"),
- * hopefully encouraging the caller to back off (unlock any high-level 
- * spinlocks) and allow the buffer some time to drain.  For wait==1 (high-
- * priority I/O along the lines of kernel error messages), we will flush
- * the current contents of the send buffer and beat on the uart
- * until our message has been completely transmitted.
- */
-
-static int
-brl1_send( l1sc_t *sc, char *msg, int len, u_char type_and_subch, int wait )
-{
-    unsigned long pl = 0;
-    int index;
-    int pkt_len = 0;
-    unsigned short crc = INIT_CRC;
-    char *send_ptr = sc->send;
-
-
-    if( sc->send_in_use && !(wait) ) {
-	/* We are in the middle of sending, but can wait until done */
-	return 0;
-    }
-    else if( sc->send_in_use ) {
-	/* buffer's in use, but we're synchronous I/O, so we're going
-	 * to send whatever's in there right now and take the buffer
-	 */
-	int counter = 0;
-
-	if ( sc->uart == BRL1_LOCALHUB_UART )
-		lock_console(sc->nasid);
-	L1SC_SEND_LOCK(sc, pl);
-	while( sc->sent < sc->send_len ) {
-		brl1_send_chars( sc );
-		if ( counter++ > 0xfffff ) {
-			char *str = "Looping waiting for uart to clear (1)\n";
-			early_l1_serial_out(sc->nasid, str, strlen(str), ALREADY_LOCKED);
-			break;
-		}
-	}
-    }
-    else {
-	if ( sc->uart == BRL1_LOCALHUB_UART )
-		lock_console(sc->nasid);
-	L1SC_SEND_LOCK(sc, pl);
-	sc->send_in_use = 1;
-    }
-    *send_ptr++ = BRL1_FLAG_CH;
-    *send_ptr++ = type_and_subch;
-    pkt_len += 2;
-    crc = crc16_calc( crc, type_and_subch );
-
-    /* limit number of characters accepted to max payload size */
-    if( len > (BRL1_QSIZE - 1) )
-	len = (BRL1_QSIZE - 1);
-
-    /* copy in the message buffer (inserting PPP 
-     * framing info where necessary)
-     */
-    for( index = 0; index < len; index++ ) {
-
-	switch( *msg ) {
-	    
-	  case BRL1_FLAG_CH:
-	    *send_ptr++ = BRL1_ESC_CH;
-	    *send_ptr++ = (*msg) ^ BRL1_XOR_CH;
-	    pkt_len += 2;
-	    break;
-	    
-	  case BRL1_ESC_CH:
-	    *send_ptr++ = BRL1_ESC_CH;
-	    *send_ptr++ = (*msg) ^ BRL1_XOR_CH;
-	    pkt_len += 2;
-	    break;
-	    
-	  default:
-	    *send_ptr++ = *msg;
-	    pkt_len++;
-	}
-	crc = crc16_calc( crc, *msg );
-	msg++;
-    }
-    crc ^= 0xffff;
-
-    for( index = 0; index < sizeof(crc); index++ ) {
-	char crc_char = (char)(crc & 0x00FF);
-	if( (crc_char == BRL1_ESC_CH) || (crc_char == BRL1_FLAG_CH) ) {
-	    *send_ptr++ = BRL1_ESC_CH;
-	    pkt_len++;
-	    crc_char ^= BRL1_XOR_CH;
-	}
-	*send_ptr++ = crc_char;
-	pkt_len++;
-	crc >>= 8;
-    }
-    
-    *send_ptr++ = BRL1_FLAG_CH;
-    pkt_len++;
-
-    sc->send_len = pkt_len;
-    sc->sent = 0;
-
-    {
-	int counter = 0;
-	do {
-		brl1_send_chars( sc );
-		if ( counter++ > 0xfffff ) {
-			char *str = "Looping waiting for uart to clear (2)\n";
-			early_l1_serial_out(sc->nasid, str, strlen(str), ALREADY_LOCKED);
-			break;
-		}
-	} while( (sc->sent < sc->send_len) && wait );
-    }
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	unlock_console(sc->nasid);
-
-    if( sc->sent == sc->send_len ) {
-	/* success! release the send buffer and call the callup */
-#if	!defined(SYNC_CONSOLE_WRITE)
-	brl1_notif_t callup;
-#endif
-
-	sc->send_in_use = 0;
-	/* call any upper layer that's asked for notification */
-#if	defined(XX_SYNC_CONSOLE_WRITE)
-	/*
-	 * This is probably not a good idea - since the l1_ write func can be called multiple
-	 * time within the callup function.
-	 */
-	callup = subch->tx_notify;
-	if( callup && (SUBCH(type_and_subch) == SC_CONS_SYSTEM) ) {
-		L1_collectibles[L1C_SEND_CALLUPS]++;
-		(*callup)(sc->subch[SUBCH(type_and_subch)].irq_frame.bf_irq,
-				sc->subch[SUBCH(type_and_subch)].irq_frame.bf_dev_id,
-				sc->subch[SUBCH(type_and_subch)].irq_frame.bf_regs, sc, SUBCH(type_and_subch));
-	}
-#endif	/* SYNC_CONSOLE_WRITE */
-    }
-#if	!defined(SYNC_CONSOLE_WRITE)
-    else if ( !wait ) {
-	/* enable low-water interrupts so buffer will be drained */
-	uart_enable_xmit_intr(sc);
-    }
-#endif
-
-    L1SC_SEND_UNLOCK(sc, pl);
-
-    return len;
-}
-
-/* brl1_send_cont is intended to be called as an interrupt service
- * routine.  It sends until the UART won't accept any more characters,
- * or until an error is encountered (in which case we surrender the
- * send buffer and give up trying to send the packet).  Once the
- * last character in the packet has been sent, this routine releases
- * the send buffer and calls any previously-registered "low-water"
- * output routines.
- */
-
-#if	!defined(SYNC_CONSOLE_WRITE)
-
-int
-brl1_send_cont( l1sc_t *sc )
-{
-    unsigned long pl = 0;
-    int done = 0;
-    brl1_notif_t callups[BRL1_NUM_SUBCHANS];
-    brl1_notif_t *callup;
-    brl1_sch_t *subch;
-    int index;
-
-    /*
-     * I'm not sure how I think this is to be handled - whether the lock is held
-     * over the interrupt - but it seems like it is a bad idea....
-     */
-
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	lock_console(sc->nasid);
-    L1SC_SEND_LOCK(sc, pl);
-    brl1_send_chars( sc );
-    done = (sc->sent == sc->send_len);
-    if( done ) {
-	sc->send_in_use = 0;
-#if	!defined(SYNC_CONSOLE_WRITE)
-	uart_disable_xmit_intr(sc);
-#endif
-    }
-    if ( sc->uart == BRL1_LOCALHUB_UART )
-	unlock_console(sc->nasid);
-    /* Release the lock */
-    L1SC_SEND_UNLOCK(sc, pl);
-
-    return 0;
-}
-#endif	/* SYNC_CONSOLE_WRITE */
-
-/* internal function -- used by brl1_receive to read a character 
- * from the uart and check whether errors occurred in the process.
- */
-static int
-read_uart( l1sc_t *sc, int *c, int *result )
-{
-    *c = sc->getc_f( sc );
-
-    /* no character is available */
-    if( *c == UART_NO_CHAR ) {
-	*result = BRL1_NO_MESSAGE;
-	return 0;
-    }
-
-    /* some error in UART */
-    if( *c < 0 ) {
-	*result = BRL1_LINK;
-	return 0;
-    }
-
-    /* everything's fine */
-    *result = BRL1_VALID;
-    return 1;
-}
-
-
-/*
- * brl1_receive
- *
- * This function reads a Bedrock-L1 protocol packet into the l1sc_t
- * response buffer.
- *
- * The operation of this function can be expressed as a finite state
- * machine:
- *
-
-START STATE			INPUT		TRANSITION
-==========================================================
-BRL1_IDLE (reset or error)	flag		BRL1_FLAG
-				other		BRL1_IDLE@
-
-BRL1_FLAG (saw a flag (0x7e))	flag		BRL1_FLAG
-				escape		BRL1_IDLE@
-				header byte	BRL1_HDR
-				other		BRL1_IDLE@
-
-BRL1_HDR (saw a type/subch byte)(see below)	BRL1_BODY
-						BRL1_HDR
-
-BRL1_BODY (reading packet body)	flag		BRL1_FLAG
-				escape		BRL1_ESC
-				other		BRL1_BODY
-
-BRL1_ESC (saw an escape (0x7d))	flag		BRL1_FLAG@
-				escape		BRL1_IDLE@
-				other		BRL1_BODY
-==========================================================
-
-"@" denotes an error transition.
-
- * The BRL1_HDR state is a transient state which doesn't read input,
- * but just provides a way in to code which decides to whom an
- * incoming packet should be directed.
- *
- * brl1_receive can be used to poll for input from the L1, or as 
- * an interrupt service routine.  It reads as much data as is
- * ready from the junk bus UART and places into the appropriate
- * input queues according to subchannel.  The header byte is
- * stripped from console-type data, but is retained for message-
- * type data (L1 responses).  A length byte will also be
- * prepended to message-type packets.
- *
- * This routine is non-blocking; if the caller needs to block
- * for input, it must call brl1_receive in a loop.
- *
- * brl1_receive returns when there is no more input, the queue
- * for the current incoming message is full, or there is an
- * error (parity error, bad header, bad CRC, etc.).
- */
-
-#define STATE_SET(l,s)		((l)->brl1_state = (s))
-#define STATE_GET(l)		((l)->brl1_state)
-
-#define LAST_HDR_SET(l,h)	((l)->brl1_last_hdr = (h))
-#define LAST_HDR_GET(l)		((l)->brl1_last_hdr)
-
-#define VALID_HDR(c)				\
-    ( SUBCH((c)) <= SC_CONS_SYSTEM		\
-	? PKT_TYPE((c)) == BRL1_REQUEST		\
-	: ( PKT_TYPE((c)) == BRL1_RESPONSE ||	\
-	    PKT_TYPE((c)) == BRL1_EVENT ) )
-
-#define IS_TTY_PKT(l)		( SUBCH(LAST_HDR_GET(l)) <= SC_CONS_SYSTEM ? 1 : 0 )
-
-
-int
-brl1_receive( l1sc_t *sc, int mode )
-{
-    int result;		/* value to be returned by brl1_receive */
-    int c;		/* most-recently-read character	     	*/
-    int done;		/* set done to break out of recv loop	*/
-    unsigned long pl = 0, cpl = 0;
-    sc_cq_t *q;		/* pointer to queue we're working with	*/
-
-    result = BRL1_NO_MESSAGE;
-
-    L1SC_RECV_LOCK(sc, cpl);
-
-    done = 0;
-    while( !done )
-    {
-	switch( STATE_GET(sc) )
-	{
-
-	  case BRL1_IDLE:
-	    /* Initial or error state.  Waiting for a flag character
-             * to resynchronize with the L1.
-             */
-
-	    if( !read_uart( sc, &c, &result ) ) {
-
-		/* error reading uart */
-		done = 1;
-		continue;
-	    }
-	    
-	    if( c == BRL1_FLAG_CH ) {
-		/* saw a flag character */
-		STATE_SET( sc, BRL1_FLAG );
-		continue;
-	    }
-	    break;
-	    
-	  case BRL1_FLAG:
-	    /* One or more flag characters have been read; look for
-	     * the beginning of a packet (header byte).
-	     */
-	    
-	    if( !read_uart( sc, &c, &result ) ) {
-
-		/* error reading uart */
-		if( c != UART_NO_CHAR )
-		    STATE_SET( sc, BRL1_IDLE );
-
-		done = 1;
-		continue;
-	    }
-	    
-	    if( c == BRL1_FLAG_CH ) {
-		/* multiple flags are OK */
-		continue;
-	    }
-
-	    if( !VALID_HDR( c ) ) {
-		/* if c isn't a flag it should have been
-		 * a valid header, so we have an error
-		 */
-		result = BRL1_PROTOCOL;
-		STATE_SET( sc, BRL1_IDLE );
-		done = 1;
-		continue;
-	    }
-
-	    /* we have a valid header byte */
-	    LAST_HDR_SET( sc, c );
-	    STATE_SET( sc, BRL1_HDR );
-
-	    break; 
-
-	  case BRL1_HDR:
-	    /* A header byte has been read. Do some bookkeeping. */
-	    q = sc->subch[ SUBCH( LAST_HDR_GET(sc) ) ].iqp;
-	    ASSERT(q);
-	    
-	    if( !IS_TTY_PKT(sc) ) {
-		/* if this is an event or command response rather
-		 * than console I/O, we need to reserve a couple
-		 * of extra spaces in the queue for the header
-		 * byte and a length byte; if we can't, stay in
-		 * the BRL1_HDR state.
-		 */
-		if( cq_room( q ) < 2 ) {
-		    result = BRL1_FULL_Q;
-		    done = 1;
-		    continue;
-		}
-		cq_tent_add( q, 0 );			/* reserve length byte */
-		cq_tent_add( q, LAST_HDR_GET( sc ) );	/* record header byte  */
-	    }
-	    STATE_SET( sc, BRL1_BODY );
-
-	    break;
-
-	  case BRL1_BODY:
-	    /* A header byte has been read.  We are now attempting
-	     * to receive the packet body.
-	     */
-
-	    q = sc->subch[ SUBCH( LAST_HDR_GET(sc) ) ].iqp;
-	    ASSERT(q);
-
-	    /* if the queue we want to write into is full, don't read from
-	     * the uart (this provides backpressure to the L1 side)
-	     */
-	    if( cq_tent_full( q ) ) {
-		result = BRL1_FULL_Q;
-		done = 1;
-		continue;
-	    }
-	    
-	    if( !read_uart( sc, &c, &result ) ) {
-
-		/* error reading uart */
-		if( c != UART_NO_CHAR )
-		    STATE_SET( sc, BRL1_IDLE );
-		done = 1;
-		continue;
-	    }
-
-	    if( c == BRL1_ESC_CH ) {
-		/* prepare to unescape the next character */
-		STATE_SET( sc, BRL1_ESC );
-		continue;
-	    }
-	    
-	    if( c == BRL1_FLAG_CH ) {
-		/* flag signifies the end of a packet */
-
-		unsigned short crc;	/* holds the crc as we calculate it */
-		int i;			/* index variable */
-		brl1_sch_t *subch;      /* subchannel for received packet */
-		brl1_notif_t callup;	/* "data ready" callup */
-
-		/* whatever else may happen, we've seen a flag and we're
-		 * starting a new packet
-		 */
-		STATE_SET( sc, BRL1_FLAG );
-
-		/* if the packet body has less than 2 characters,
-		 * it can't be a well-formed packet.  Discard it.
-		 */
-		if( cq_tent_len( q ) < /* 2 + possible length byte */
-		    (2 + (IS_TTY_PKT(sc) ? 0 : 1)) )
-		{
-		    result = BRL1_PROTOCOL;
-		    cq_discard_tent( q );
-		    STATE_SET( sc, BRL1_FLAG );
-		    done = 1;
-		    continue;
-		}
-		
-		/* check CRC */
-
-		/* accumulate CRC, starting with the header byte and
-		 * ending with the transmitted CRC.  This should
-		 * result in a known good value.
-		 */
-		crc = crc16_calc( INIT_CRC, LAST_HDR_GET(sc) );
-		for( i = (q->ipos + (IS_TTY_PKT(sc) ? 0 : 2)) % BRL1_QSIZE;
-		     i != q->tent_next;
-		     i = (i + 1) % BRL1_QSIZE )
-		{
-		    crc = crc16_calc( crc, q->buf[i] );
-		}
-
-		/* verify the caclulated crc against the "good" crc value;
-		 * if we fail, discard the bad packet and return an error.
-		 */
-		if( crc != (unsigned short)GOOD_CRC ) {
-		    result = BRL1_CRC;
-		    cq_discard_tent( q );
-		    STATE_SET( sc, BRL1_FLAG );
-		    done = 1;
-		    continue;
-		}
-		
-		/* so the crc check was ok.  Now we discard the CRC
-		 * from the end of the received bytes.
-		 */
-		q->tent_next += (BRL1_QSIZE - 2);
-		q->tent_next %= BRL1_QSIZE;
-
-		/* get the subchannel and lock it */
-		subch = &(sc->subch[SUBCH( LAST_HDR_GET(sc) )]);
-		SUBCH_DATA_LOCK( subch, pl );
-		
-		/* if this isn't a console packet, we need to record
-		 * a length byte
-		 */
-		if( !IS_TTY_PKT(sc) ) {
-		    q->buf[q->ipos] = cq_tent_len( q ) - 1;
-		}
-		
-		/* record packet for posterity */
-		cq_commit_tent( q );
-		result = BRL1_VALID;
-
-		/* notify subchannel owner that there's something
-		 * on the queue for them
-		 */
-		atomic_inc(&(subch->packet_arrived));
-		callup = subch->rx_notify;
-		SUBCH_DATA_UNLOCK( subch, pl );
-
-		if( callup && (mode == SERIAL_INTERRUPT_MODE) ) {
-		    L1SC_RECV_UNLOCK( sc, cpl );
-		    L1_collectibles[L1C_RECEIVE_CALLUPS]++;
-		    (*callup)( sc->subch[SUBCH(LAST_HDR_GET(sc))].irq_frame.bf_irq,
-				sc->subch[SUBCH(LAST_HDR_GET(sc))].irq_frame.bf_dev_id,
-				sc->subch[SUBCH(LAST_HDR_GET(sc))].irq_frame.bf_regs,
-				sc, SUBCH(LAST_HDR_GET(sc)) );
-		    L1SC_RECV_LOCK( sc, cpl );
-		}
-		continue;	/* go back for more! */
-	    }
-	    
-	    /* none of the special cases applied; we've got a normal
-	     * body character
-	     */
-	    cq_tent_add( q, c );
-
-	    break;
-
-	  case BRL1_ESC:
-	    /* saw an escape character.  The next character will need
-	     * to be unescaped.
-	     */
-
-	    q = sc->subch[ SUBCH( LAST_HDR_GET(sc) ) ].iqp;
-	    ASSERT(q);
-
-	    /* if the queue we want to write into is full, don't read from
-	     * the uart (this provides backpressure to the L1 side)
-	     */
-	    if( cq_tent_full( q ) ) {
-		result = BRL1_FULL_Q;
-		done = 1;
-		continue;
-	    }
-	    
-	    if( !read_uart( sc, &c, &result ) ) {
-
-		/* error reading uart */
-		if( c != UART_NO_CHAR ) {
-		    cq_discard_tent( q );
-		    STATE_SET( sc, BRL1_IDLE );
-		}
-		done = 1;
-		continue;
-	    }
-	    
-	    if( c == BRL1_FLAG_CH ) {
-		/* flag after escape is an error */
-		STATE_SET( sc, BRL1_FLAG );
-		cq_discard_tent( q );
-		result = BRL1_PROTOCOL;
-		done = 1;
-		continue;
-	    }
-
-	    if( c == BRL1_ESC_CH ) {
-		/* two consecutive escapes is an error */
-		STATE_SET( sc, BRL1_IDLE );
-		cq_discard_tent( q );
-		result = BRL1_PROTOCOL;
-		done = 1;
-		continue;
-	    }
-	    
-	    /* otherwise, we've got a character that needs
-	     * to be unescaped
-	     */
-	    cq_tent_add( q, (c ^ BRL1_XOR_CH) );
-	    STATE_SET( sc, BRL1_BODY );
-
-	    break;
-
-	} /* end of switch( STATE_GET(sc) ) */
-    } /* end of while(!done) */
-
-    L1SC_RECV_UNLOCK( sc, cpl );
-
-    return result;
-}	    
-
-
-/* brl1_init initializes the Bedrock/L1 protocol layer.  This includes
- * zeroing out the send and receive state information.
- */
-
-void
-brl1_init( l1sc_t *sc, nasid_t nasid, net_vec_t uart )
-{
-    int i;
-    brl1_sch_t *subch;
-
-    bzero( sc, sizeof( *sc ) );
-    sc->nasid = nasid;
-    sc->uart = uart;
-    sc->getc_f = (uart == BRL1_LOCALHUB_UART ? uart_getc : rtr_uart_getc);
-    sc->putc_f = (uart == BRL1_LOCALHUB_UART ? uart_putc : rtr_uart_putc);
-    sc->sol = 1;
-    subch = sc->subch;
-
-    /* initialize L1 subchannels
-     */
-
-    /* assign processor TTY channels */
-    for( i = 0; i < CPUS_PER_NODE; i++, subch++ ) {
-	subch->use = BRL1_SUBCH_RSVD;
-	subch->packet_arrived = ATOMIC_INIT(0);
-	spin_lock_init( &(subch->data_lock) );
-	sv_init( &(subch->arrive_sv), &(subch->data_lock), SV_MON_SPIN | SV_ORDER_FIFO /* | SV_INTS */ );
-	subch->tx_notify = NULL;
-	/* (for now, drop elscuart packets in the kernel) */
-	subch->rx_notify = brl1_discard_packet;
-	subch->iqp = &sc->garbage_q;
-    }
-
-    /* assign system TTY channel (first free subchannel after each
-     * processor's individual TTY channel has been assigned)
-     */
-    subch->use = BRL1_SUBCH_RSVD;
-    subch->packet_arrived = ATOMIC_INIT(0);
-    spin_lock_init( &(subch->data_lock) );
-    sv_init( &(subch->arrive_sv), &subch->data_lock, SV_MON_SPIN | SV_ORDER_FIFO /* | SV_INTS */ );
-    subch->tx_notify = NULL;
-    if( sc->uart == BRL1_LOCALHUB_UART ) {
-	subch->iqp = snia_kmem_zalloc_node( sizeof(sc_cq_t), KM_NOSLEEP, NASID_TO_COMPACT_NODEID(nasid) );
-	ASSERT( subch->iqp );
-	cq_init( subch->iqp );
-	subch->rx_notify = NULL;
-    }
-    else {
-	/* we shouldn't be getting console input from remote UARTs */
-	subch->iqp = &sc->garbage_q;
-	subch->rx_notify = brl1_discard_packet;
-    }
-    subch++; i++;
-
-    /* "reserved" subchannels (0x05-0x0F); for now, throw away
-     * incoming packets
-     */
-    for( ; i < 0x10; i++, subch++ ) {
-	subch->use = BRL1_SUBCH_FREE;
-	subch->packet_arrived = ATOMIC_INIT(0);
-	subch->tx_notify = NULL;
-	subch->rx_notify = brl1_discard_packet;
-	subch->iqp = &sc->garbage_q;
-    }
-
-    /* remaining subchannels are free */
-    for( ; i < BRL1_NUM_SUBCHANS; i++, subch++ ) {
-	subch->use = BRL1_SUBCH_FREE;
-	subch->packet_arrived = ATOMIC_INIT(0);
-	subch->tx_notify = NULL;
-	subch->rx_notify = brl1_discard_packet;
-	subch->iqp = &sc->garbage_q;
-    }
-
-    /* initialize synchronization structures
-     */
-    spin_lock_init( &(sc->subch_lock) );
-    spin_lock_init( &(sc->send_lock) );
-    spin_lock_init( &(sc->recv_lock) );
-
-    if( sc->uart == BRL1_LOCALHUB_UART ) {
-	uart_init( sc, UART_BAUD_RATE );
-    }
-    else {
-	rtr_uart_init( sc, UART_BAUD_RATE );
-    }
-
-    /* Set up remaining fields using L1 command functions-- elsc_module_get
-     * to read the module id, elsc_debug_get to see whether or not we're
-     * in verbose mode.
-     */
-    {
-	extern int elsc_module_get(l1sc_t *);
-
-	sc->modid = elsc_module_get( sc );
-	sc->modid = (sc->modid < 0 ? INVALID_MODULE : sc->modid);
-	sc->verbose = 1;
-    }
-}
-
-/*********************************************************************
- * These are interrupt-related functions used in the kernel to service
- * the L1.
- */
-
-/*
- * brl1_intrd is the function which is called on a console interrupt.
- */
-
-#if defined(CONFIG_IA64_SGI_SN1)
-
-static void
-brl1_intrd(int irq, void *dev_id, struct pt_regs *stuff)
-{
-    u_char isr_reg;
-    l1sc_t *sc = get_elsc();
-    int ret;
-
-    L1_collectibles[L1C_INTERRUPTS]++;
-    isr_reg = READ_L1_UART_REG(sc->nasid, REG_ISR);
-
-    /* Save for callup args in console */
-    sc->subch[SC_CONS_SYSTEM].irq_frame.bf_irq = irq;
-    sc->subch[SC_CONS_SYSTEM].irq_frame.bf_dev_id = dev_id;
-    sc->subch[SC_CONS_SYSTEM].irq_frame.bf_regs = stuff;
-
-#if	defined(SYNC_CONSOLE_WRITE)
-    while( isr_reg & ISR_RxRDY )
-#else
-    while( isr_reg & (ISR_RxRDY | ISR_TxRDY) )
-#endif
-    {
-	if( isr_reg & ISR_RxRDY ) {
-	    L1_collectibles[L1C_OUR_R_INTERRUPTS]++;
-	    ret = brl1_receive(sc, SERIAL_INTERRUPT_MODE);
-	    if ( (ret != BRL1_VALID) && (ret != BRL1_NO_MESSAGE) && (ret != BRL1_PROTOCOL) && (ret != BRL1_CRC) )
-		L1_collectibles[L1C_REC_STALLS] = ret;
-	}
-#if	!defined(SYNC_CONSOLE_WRITE)
-	if( (isr_reg & ISR_TxRDY) || (sc->send_in_use && UART_PUTC_READY(sc->nasid)) ) {
-	    L1_collectibles[L1C_OUR_X_INTERRUPTS]++;
-	    brl1_send_cont(sc);
-	}
-#endif	/* SYNC_CONSOLE_WRITE */
-	isr_reg = READ_L1_UART_REG(sc->nasid, REG_ISR);
-    }
-}
-#endif	/* CONFIG_IA64_SGI_SN1 */
-
-
-/*
- * Install a callback function for the system console subchannel 
- * to allow an upper layer to be notified when the send buffer 
- * has been emptied.
- */
-static inline void
-l1_tx_notif( brl1_notif_t func )
-{
-	subch_set_tx_notify( &NODEPDA(NASID_TO_COMPACT_NODEID(get_master_nasid()))->module->elsc,
-			SC_CONS_SYSTEM, func );
-}
-
-
-/*
- * Install a callback function for the system console subchannel
- * to allow an upper layer to be notified when a packet has been
- * received.
- */
-static inline void
-l1_rx_notif( brl1_notif_t func )
-{
-	subch_set_rx_notify( &NODEPDA(NASID_TO_COMPACT_NODEID(get_master_nasid()))->module->elsc,
-				SC_CONS_SYSTEM, func );
-}
-
-
-/* brl1_intr is called directly from the uart interrupt; after it runs, the
- * interrupt "daemon" xthread is signalled to continue.
- */
-void
-brl1_intr( void )
-{
-}
-
-#define BRL1_INTERRUPT_LEVEL	65	/* linux request_irq() value */
-
-/* Return the current interrupt level */
-
-//#define CONSOLE_POLLING_ALSO
-
-int
-l1_get_intr_value( void )
-{
-#if defined(USE_SAL_CONSOLE_IO)
-	return(0);
-#else
-#if defined(CONSOLE_POLLING_ALSO)
-	return(0);
-#else
-	return(BRL1_INTERRUPT_LEVEL);
-#endif /* CONSOLE_POLLING_ALSO */
-#endif /* USE_SAL_CONSOLE_IO */
-}
-
-/* Disconnect the callup functions - throw away interrupts */
-
-void
-l1_unconnect_intr(void)
-{
-#if !defined(USE_SAL_CONSOLE_IO)
-	/* UnRegister the upper-level callup functions */
-	l1_rx_notif((brl1_notif_t)NULL);
-	l1_tx_notif((brl1_notif_t)NULL);
-	/* We do NOT unregister the interrupts */
-#endif /* !USE_SAL_CONSOLE_IO */
-}
-
-/* Set up uart interrupt handling for this node's uart */
-
-void
-l1_connect_intr(void *rx_notify, void *tx_notify)
-{
-#if defined(USE_SAL_CONSOLE_IO)
-#if 0
-	// Will need code here for sn2 - something like this
-	console_nodepda = NODEPDA(NASID_TO_COMPACT_NODEID(get_master_nasid());
-	intr_connect_level(console_nodepda->node_first_cpu,
-                                SGI_UART_VECTOR, INTPEND0_MAXMASK,
-                                dummy_intr_func);
-	request_irq(SGI_UART_VECTOR | (console_nodepda->node_first_cpu << 8),
-                                intr_func, SA_INTERRUPT | SA_SHIRQ,
-                                "l1_protocol_driver", (void *)sc);
-#endif
-#else
-	l1sc_t *sc;
-	nasid_t nasid;
-#if defined(CONFIG_IA64_SGI_SN1)
-	int tmp;
-#endif
-	nodepda_t *console_nodepda;
-	int intr_connect_level(cpuid_t, int, ilvl_t, intr_func_t);
-
-	if ( L1_interrupts_connected ) {
-		/* Interrupts are connected, so just register the callups */
-		l1_rx_notif((brl1_notif_t)rx_notify);
-		l1_tx_notif((brl1_notif_t)tx_notify);
-
-		L1_collectibles[L1C_CONNECT_CALLS]++;
-		return;
-	}
-	else
-		L1_interrupts_connected = 1;
-
-	nasid = get_master_nasid();
-	console_nodepda = NODEPDA(NASID_TO_COMPACT_NODEID(nasid));
-	sc = &console_nodepda->module->elsc;
-	sc->intr_cpu = console_nodepda->node_first_cpu;
-
-#if defined(CONFIG_IA64_SGI_SN1)
-	if ( intr_connect_level(sc->intr_cpu, UART_INTR, INTPEND0_MAXMASK, (intr_func_t)brl1_intr) ) {
-		L1_interrupts_connected = 0; /* FAILS !! */
-	}
-	else {
-		void synergy_intr_connect(int, int);
-
-		synergy_intr_connect(UART_INTR, sc->intr_cpu);
-		L1_collectibles[L1C_R_IRQ]++;
-		tmp = request_irq(BRL1_INTERRUPT_LEVEL, brl1_intrd, SA_INTERRUPT | SA_SHIRQ, "l1_protocol_driver", (void *)sc);
-		L1_collectibles[L1C_R_IRQ_RET] = (uint64_t)tmp;
-		if ( tmp ) {
-			L1_interrupts_connected = 0; /* FAILS !! */
-		}
-		else {
-			/* Register the upper-level callup functions */
-			l1_rx_notif((brl1_notif_t)rx_notify);
-			l1_tx_notif((brl1_notif_t)tx_notify);
-
-			/* Set the uarts the way we like it */
-			uart_enable_recv_intr( sc );
-			uart_disable_xmit_intr( sc );
-		}
-	}
-#endif	/* CONFIG_IA64_SGI_SN1 */
-#endif	/* USE_SAL_CONSOLE_IO */
-}
-
-
-/* These are functions to use from serial_in/out when in protocol
- * mode to send and receive uart control regs. These are external
- * interfaces into the protocol driver.
- */
-
-void
-l1_control_out(int offset, int value)
-{
-#if defined(USE_SAL_CONSOLE_IO)
-	/* quietly ignore unless simulator */
-	if ( IS_RUNNING_ON_SIMULATOR() ) {
-		extern u64 master_node_bedrock_address;
-		if ( master_node_bedrock_address != (u64)0 ) {
-			writeb(value, (unsigned long)master_node_bedrock_address +
-				(offset<< 3));
-		}
-		return;
-	}
-#else
-	nasid_t nasid = get_master_nasid();
-	WRITE_L1_UART_REG(nasid, offset, value); 
-#endif
-}
-
-/* Console input exported interface. Return a register value.  */
-
-int
-l1_control_in_polled(int offset)
-{
-	static int l1_control_in_local(int, int);
-
-	return(l1_control_in_local(offset, SERIAL_POLLED_MODE));
-}
-
-int
-l1_control_in(int offset)
-{
-	static int l1_control_in_local(int, int);
-
-	return(l1_control_in_local(offset, SERIAL_INTERRUPT_MODE));
-}
-
-static int
-l1_control_in_local(int offset, int mode)
-{
-#if defined(USE_SAL_CONSOLE_IO)
-	int sal_call_status = 0, input;
-	int ret = 0;
-
-	if ( offset == REG_LSR ) {
-		ret = (LSR_XHRE | LSR_XSRE);	/* can send anytime */
-		sal_call_status = ia64_sn_console_check(&input);
-		if ( !sal_call_status && input ) {
-			/* input pending */
-			ret |= LSR_RCA;
-		}
-	}
-
-	/* If the sal call failed, do it the old-fashioned way */
-	if ( sal_call_status ) {
-		if ( IS_RUNNING_ON_SIMULATOR() ) {
-			extern u64 master_node_bedrock_address;
-			ret = readb((unsigned long)master_node_bedrock_address +
-					(offset<< 3));
-		}		
-		else {
-#endif	/* USE_SAL_CONSOLE_IO */
-			nasid_t nasid;
-			int ret, input;
-			static int l1_poll(l1sc_t *, int);
-
-			nasid = get_master_nasid();
-			ret = READ_L1_UART_REG(nasid, offset); 
-
-			if ( offset == REG_LSR ) {
-				ret |= (LSR_XHRE | LSR_XSRE);	/* can send anytime */
-				if ( L1_cons_is_inited ) {
-					if ( NODEPDA(NASID_TO_COMPACT_NODEID(nasid))->module != (module_t *)0 ) {
-						input = l1_poll(&NODEPDA(NASID_TO_COMPACT_NODEID(nasid))->module->elsc, mode);
-						if ( input ) {
-							ret |= LSR_RCA;
-						}
-					}
-				}
-			}
-#if defined(USE_SAL_CONSOLE_IO)
-		}
-	}
-#endif
-	return(ret);
-}
-
-/*
- * Console input exported interface. Return a character (if one is available)
- */
-
-int
-l1_serial_in_polled(void)
-{
-	static int l1_serial_in_local(int mode);
-
-	return(l1_serial_in_local(SERIAL_POLLED_MODE));
-}
-
-int
-l1_serial_in(void)
-{
-	static int l1_serial_in_local(int mode);
-
-	return(l1_serial_in_local(SERIAL_INTERRUPT_MODE));
-}
-
-static int
-l1_serial_in_local(int mode)
-{
-#if defined(USE_SAL_CONSOLE_IO)
-	int sal_call_status;
-	int ch;
-
-	sal_call_status = ia64_sn_console_getc(&ch);
-	if ( !sal_call_status ) {
-		return(ch);
-	}
-	else {
-		/* If the sal called failed - do it the old-fashioned way */
-		if ( IS_RUNNING_ON_SIMULATOR() ) {
-			extern u64 master_node_bedrock_address;
-			return(readb((unsigned long)master_node_bedrock_address + (REG_DAT<< 3)));
-		}		
-		else {
-#endif	/* USE_SAL_CONSOLE_IO */
-			nasid_t nasid;
-			l1sc_t *sc;
-			int value;
-			static int l1_getc( l1sc_t *, int );
-			static inline l1sc_t *early_sc_init(nasid_t);
-
-			nasid = get_master_nasid();
-			sc = early_sc_init(nasid);
-			if ( L1_cons_is_inited ) {
-				if ( NODEPDA(NASID_TO_COMPACT_NODEID(nasid))->module != (module_t *)0 ) {
-					sc = &NODEPDA(NASID_TO_COMPACT_NODEID(nasid))->module->elsc;
-				}
-			}
-			value = l1_getc(sc, mode);
-			return(value);
-#if defined(USE_SAL_CONSOLE_IO)
-		}
-	}
-#endif
-}
-
-/* Console output exported interface. Write message to the console.  */
-
-int
-l1_serial_out( char *str, int len )
-{
-#if defined(USE_SAL_CONSOLE_IO)
-	int sal_call_status = 0;
-	int counter = len;
-
-	/* Attempt to write things out thru the sal */
-	while ( counter > 0 ) {
-		if ( (sal_call_status = ia64_sn_console_putc(*str)) ) {
-			break;
-		}
-		counter--;
-		str++;
-	}
-	if ( sal_call_status ) {
-		/* If the sal called failed - do it the old-fashioned way */
-		if ( IS_RUNNING_ON_SIMULATOR() ) {
-			extern u64 master_node_bedrock_address;
-                        if (!master_node_bedrock_address)
-                                early_sn_setup();
-			if ( master_node_bedrock_address != (u64)0 ) {
-#ifdef FLAG_DIRECT_CONSOLE_WRITES
-				/* This is an easy way to pre-pend the output to know whether the output
-				 * was done via sal or directly */
-				writeb('[', (unsigned long)master_node_bedrock_address + (REG_DAT<< 3));
-				writeb('+', (unsigned long)master_node_bedrock_address + (REG_DAT<< 3));
-				writeb(']', (unsigned long)master_node_bedrock_address + (REG_DAT<< 3));
-				writeb(' ', (unsigned long)master_node_bedrock_address + (REG_DAT<< 3));
-#endif	/* FLAG_DIRECT_CONSOLE_WRITES */
-				while ( counter > 0 ) {
-					writeb(*str, (unsigned long)master_node_bedrock_address + (REG_DAT<< 3));
-					counter--;
-					str++;
-				}
-			}
-		}
-		else {
-#endif	/* USE_SAL_CONSOLE_IO */
-			nasid_t nasid = get_master_nasid();
-			int l1_write(l1sc_t *, char *, int, int);
-
-			if ( L1_cons_is_inited ) {
-				if ( NODEPDA(NASID_TO_COMPACT_NODEID(nasid))->module != (module_t *)0 )
-					return(l1_write(&NODEPDA(NASID_TO_COMPACT_NODEID(nasid))->module->elsc, str, len,
-#if	defined(SYNC_CONSOLE_WRITE)
-							1
-#else
-							!L1_interrupts_connected
-#endif
-									));
-			}
-			return(early_l1_serial_out(nasid, str, len, NOT_LOCKED));
-#if defined(USE_SAL_CONSOLE_IO)
-		}
-	}
-	return((counter <= 0) ? 0 : (len - counter));
-#endif
-}
-
-
-/*
- * These are the 'early' functions - when we need to do things before we have
- * all the structs setup.
- */
-
-
-static l1sc_t Early_console;		/* fake l1sc_t */
-static int Early_console_inited = 0;
-
-static void
-early_brl1_init( l1sc_t *sc, nasid_t nasid, net_vec_t uart )
-{
-    int i;
-    brl1_sch_t *subch;
-
-    bzero( sc, sizeof( *sc ) );
-    sc->nasid = nasid;
-    sc->uart = uart;
-    sc->getc_f = (uart == BRL1_LOCALHUB_UART ? uart_getc : rtr_uart_getc);
-    sc->putc_f = (uart == BRL1_LOCALHUB_UART ? uart_putc : rtr_uart_putc);
-    sc->sol = 1;
-    subch = sc->subch;
-
-    /* initialize L1 subchannels
-     */
-
-    /* assign processor TTY channels */
-    for( i = 0; i < CPUS_PER_NODE; i++, subch++ ) {
-	subch->use = BRL1_SUBCH_RSVD;
-	subch->packet_arrived = ATOMIC_INIT(0);
-	subch->tx_notify = NULL;
-	subch->rx_notify = NULL;
-	subch->iqp = &sc->garbage_q;
-    }
-
-    /* assign system TTY channel (first free subchannel after each
-     * processor's individual TTY channel has been assigned)
-     */
-    subch->use = BRL1_SUBCH_RSVD;
-    subch->packet_arrived = ATOMIC_INIT(0);
-    subch->tx_notify = NULL;
-    subch->rx_notify = NULL;
-    if( sc->uart == BRL1_LOCALHUB_UART ) {
-	static sc_cq_t x_iqp;
-
-	subch->iqp = &x_iqp;
-	ASSERT( subch->iqp );
-	cq_init( subch->iqp );
-    }
-    else {
-	/* we shouldn't be getting console input from remote UARTs */
-	subch->iqp = &sc->garbage_q;
-    }
-    subch++; i++;
-
-    /* "reserved" subchannels (0x05-0x0F); for now, throw away
-     * incoming packets
-     */
-    for( ; i < 0x10; i++, subch++ ) {
-	subch->use = BRL1_SUBCH_FREE;
-	subch->packet_arrived = ATOMIC_INIT(0);
-	subch->tx_notify = NULL;
-	subch->rx_notify = NULL;
-	subch->iqp = &sc->garbage_q;
-    }
-
-    /* remaining subchannels are free */
-    for( ; i < BRL1_NUM_SUBCHANS; i++, subch++ ) {
-	subch->use = BRL1_SUBCH_FREE;
-	subch->packet_arrived = ATOMIC_INIT(0);
-	subch->tx_notify = NULL;
-	subch->rx_notify = NULL;
-	subch->iqp = &sc->garbage_q;
-    }
-}
-
-static inline l1sc_t *
-early_sc_init(nasid_t nasid)
-{
-	/* This is for early I/O */
-	if ( Early_console_inited == 0 ) {
-    		early_brl1_init(&Early_console, nasid,  BRL1_LOCALHUB_UART);
-		Early_console_inited = 1;
-	}
-	return(&Early_console);
-}
-
-#define PUTCHAR(ch) \
-    { \
-        while( (!(READ_L1_UART_REG( nasid, REG_LSR ) & LSR_XHRE)) || \
-                (!(READ_L1_UART_REG( nasid, REG_MSR ) & MSR_CTS)) ); \
-        WRITE_L1_UART_REG( nasid, REG_DAT, (ch) ); \
-    }
-
-static int
-early_l1_serial_out( nasid_t nasid, char *str, int len, int lock_state )
-{
-	int ret, sent = 0;
-	char *msg = str;
-	static int early_l1_send( nasid_t nasid, char *str, int len, int lock_state );
-
-	while ( sent < len ) {
-		ret = early_l1_send(nasid, msg, len - sent, lock_state);
-		sent += ret;
-		msg += ret;
-	}
-	return(len);
-}
-
-static inline int
-early_l1_send( nasid_t nasid, char *str, int len, int lock_state )
-{
-    int sent;
-    char crc_char;
-    unsigned short crc = INIT_CRC;
-
-    if( len > (BRL1_QSIZE - 1) )
-	len = (BRL1_QSIZE - 1);
-
-    sent = len;
-    if ( lock_state == NOT_LOCKED )
-    	lock_console(nasid);
-
-    PUTCHAR( BRL1_FLAG_CH );
-    PUTCHAR( BRL1_EVENT | SC_CONS_SYSTEM );
-    crc = crc16_calc( crc, (BRL1_EVENT | SC_CONS_SYSTEM) );
-
-    while( len ) {
-
-	if( (*str == BRL1_FLAG_CH) || (*str == BRL1_ESC_CH) ) {
-	    PUTCHAR( BRL1_ESC_CH );
-	    PUTCHAR( (*str) ^ BRL1_XOR_CH );
-	}
-	else {
-	    PUTCHAR( *str );
-	}
-	
-	crc = crc16_calc( crc, *str );
-
-	str++; len--;
-    }
-    
-    crc ^= 0xffff;
-    crc_char = crc & 0xff;
-    if( (crc_char == BRL1_ESC_CH) || (crc_char == BRL1_FLAG_CH) ) {
-	crc_char ^= BRL1_XOR_CH;
-	PUTCHAR( BRL1_ESC_CH );
-    }
-    PUTCHAR( crc_char );
-    crc_char = (crc >> 8) & 0xff;
-    if( (crc_char == BRL1_ESC_CH) || (crc_char == BRL1_FLAG_CH) ) {
-	crc_char ^= BRL1_XOR_CH;
-	PUTCHAR( BRL1_ESC_CH );
-    }
-    PUTCHAR( crc_char );
-    PUTCHAR( BRL1_FLAG_CH );
-
-    if ( lock_state == NOT_LOCKED )
-    	unlock_console(nasid);
-    return sent;
-}
-
-/*********************************************************************
- * l1_cons functions
- *
- * These allow the L1 to act as the system console.  They're intended
- * to abstract away most of the br/l1 internal details from the
- * _L1_cons_* functions (in the prom-- see "l1_console.c") and
- * l1_* functions (in the kernel-- see "sio_l1.c") that they support.
- *
- */
-
-static int
-l1_poll( l1sc_t *sc, int mode )
-{
-    int ret;
-
-    /* in case this gets called before the l1sc_t structure for the module_t
-     * struct for this node is initialized (i.e., if we're called with a
-     * zero l1sc_t pointer)...
-     */
-
-
-    if( !sc ) {
-	return 0;
-    }
-
-    if( atomic_read(&sc->subch[SC_CONS_SYSTEM].packet_arrived) ) {
-	return 1;
-    }
-
-    ret = brl1_receive( sc, mode );
-    if ( (ret != BRL1_VALID) && (ret != BRL1_NO_MESSAGE) && (ret != BRL1_PROTOCOL) && (ret != BRL1_CRC) )
-	L1_collectibles[L1C_REC_STALLS] = ret;
-
-    if( atomic_read(&sc->subch[SC_CONS_SYSTEM].packet_arrived) ) {
-	return 1;
-    }
-    return 0;
-}
-
-
-/* pull a character off of the system console queue (if one is available)
- */
-static int
-l1_getc( l1sc_t *sc, int mode )
-{
-    unsigned long pl = 0;
-    int c;
-
-    brl1_sch_t *subch = &(sc->subch[SC_CONS_SYSTEM]);
-    sc_cq_t *q = subch->iqp;
-
-    if( !l1_poll( sc, mode ) ) {
-	return 0;
-    }
-
-    SUBCH_DATA_LOCK( subch, pl );
-    if( cq_empty( q ) ) {
-	atomic_set(&subch->packet_arrived, 0);
-	SUBCH_DATA_UNLOCK( subch, pl );
-	return 0;
-    }
-    cq_rem( q, c );
-    if( cq_empty( q ) )
-	atomic_set(&subch->packet_arrived, 0);
-    SUBCH_DATA_UNLOCK( subch, pl );
-
-    return c;
-}
-
-/*
- * Write a message to the L1 on the system console subchannel.
- *
- * Danger: don't use a non-zero value for the wait parameter unless you're
- * someone important (like a kernel error message).
- */
-
-int
-l1_write( l1sc_t *sc, char *msg, int len, int wait )
-{
-	int sent = 0, ret = 0;
-
-	if ( wait ) {
-		while ( sent < len ) {
-			ret = brl1_send( sc, msg, len - sent, (SC_CONS_SYSTEM | BRL1_EVENT), wait );
-			sent += ret;
-			msg += ret;
-		}
-		ret = len;
-	}
-	else {
-		ret = brl1_send( sc, msg, len, (SC_CONS_SYSTEM | BRL1_EVENT), wait );
-	}
-	return(ret);
-}
-
-/* initialize the system console subchannel
- */
-void
-l1_init(void)
-{
-	/* All we do now is remember that we have been called */
-	L1_cons_is_inited = 1;
-}
-
-
-/*********************************************************************
- * The following functions and definitions implement the "message"-
- * style interface to the L1 system controller.
- *
- * Note that throughout this file, "sc" generally stands for "system
- * controller", while "subchannels" tend to be represented by
- * variables with names like subch or ch.
- *
- */
-
-#ifdef L1_DEBUG
-#define L1_DBG_PRF(x) printf x
-#else
-#define L1_DBG_PRF(x)
-#endif
-
-/*
- * sc_data_ready is called to signal threads that are blocked on l1 input.
- */
-void
-sc_data_ready( int dummy0, void *dummy1, struct pt_regs *dummy2, l1sc_t *sc, int ch )
-{
-    unsigned long pl = 0;
-
-    brl1_sch_t *subch = &(sc->subch[ch]);
-    SUBCH_DATA_LOCK( subch, pl );
-    sv_signal( &(subch->arrive_sv) );
-    SUBCH_DATA_UNLOCK( subch, pl );
-}
-
-/* sc_open reserves a subchannel to send a request to the L1 (the
- * L1's response will arrive on the same channel).  The number
- * returned by sc_open is the system controller subchannel
- * acquired.
- */
-int
-sc_open( l1sc_t *sc, uint target )
-{
-    /* The kernel version implements a locking scheme to arbitrate
-     * subchannel assignment.
-     */
-    int ch;
-    unsigned long pl = 0;
-    brl1_sch_t *subch;
-
-    SUBCH_LOCK( sc, pl );
-
-    /* Look for a free subchannel. Subchannels 0-15 are reserved
-     * for other purposes.
-     */
-    for( subch = &(sc->subch[BRL1_CMD_SUBCH]), ch = BRL1_CMD_SUBCH; 
-			ch < BRL1_NUM_SUBCHANS; subch++, ch++ ) {
-        if( subch->use == BRL1_SUBCH_FREE )
-            break;
-    }
-
-    if( ch == BRL1_NUM_SUBCHANS ) {
-        /* there were no subchannels available! */
-        SUBCH_UNLOCK( sc, pl );
-        return SC_NSUBCH;
-    }
-
-    subch->use = BRL1_SUBCH_RSVD;
-    SUBCH_UNLOCK( sc, pl );
-
-    atomic_set(&subch->packet_arrived, 0);
-    subch->target = target;
-    spin_lock_init( &(subch->data_lock) );
-    sv_init( &(subch->arrive_sv), &(subch->data_lock), SV_MON_SPIN | SV_ORDER_FIFO /* | SV_INTS */);
-    subch->tx_notify = NULL;
-    subch->rx_notify = sc_data_ready;
-    subch->iqp = snia_kmem_zalloc_node( sizeof(sc_cq_t), KM_NOSLEEP,
-				   NASID_TO_COMPACT_NODEID(sc->nasid) );
-    ASSERT( subch->iqp );
-    cq_init( subch->iqp );
-
-    return ch;
-}
-
-
-/* sc_close frees a Bedrock<->L1 subchannel.
- */
-int
-sc_close( l1sc_t *sc, int ch )
-{
-    unsigned long pl = 0;
-    brl1_sch_t *subch;
-
-    SUBCH_LOCK( sc, pl );
-    subch = &(sc->subch[ch]);
-    if( subch->use != BRL1_SUBCH_RSVD ) {
-        /* we're trying to close a subchannel that's not open */
-	SUBCH_UNLOCK( sc, pl );
-        return SC_NOPEN;
-    }
-
-    atomic_set(&subch->packet_arrived, 0);
-    subch->use = BRL1_SUBCH_FREE;
-
-    sv_broadcast( &(subch->arrive_sv) );
-    sv_destroy( &(subch->arrive_sv) );
-    spin_lock_destroy( &(subch->data_lock) );
-
-    ASSERT( subch->iqp && (subch->iqp != &sc->garbage_q) );
-    snia_kmem_free( subch->iqp, sizeof(sc_cq_t) );
-    subch->iqp = &sc->garbage_q;
-    subch->tx_notify = NULL;
-    subch->rx_notify = brl1_discard_packet;
-
-    SUBCH_UNLOCK( sc, pl );
-
-    return SC_SUCCESS;
-}
-
-
-/* sc_construct_msg builds a bedrock-to-L1 request in the supplied
- * buffer.  Returns the length of the message.  The
- * safest course when passing a buffer to be filled in is to use
- * BRL1_QSIZE as the buffer size.
- *
- * Command arguments are passed as type/argument pairs, i.e., to
- * pass the number 5 as an argument to an L1 command, call
- * sc_construct_msg as follows:
- *
- *    char msg[BRL1_QSIZE];
- *    msg_len = sc_construct_msg( msg,
- *				  BRL1_QSIZE,
- *				  target_component,
- *                                L1_ADDR_TASK_BOGUSTASK,
- *                                L1_BOGUSTASK_REQ_BOGUSREQ,
- *                                2,
- *                                L1_ARG_INT, 5 );
- *
- * To pass an additional ASCII argument, you'd do the following:
- *
- *    char *str;
- *    ... str points to a null-terminated ascii string ...
- *    msg_len = sc_construct_msg( msg,
- *                                BRL1_QSIZE,
- *				  target_component,
- *                                L1_ADDR_TASK_BOGUSTASK,
- *                                L1_BOGUSTASK_REQ_BOGUSREQ,
- *                                4,
- *                                L1_ARG_INT, 5,
- *                                L1_ARG_ASCII, str );
- *
- * Finally, arbitrary data of unknown type is passed using the argtype
- * code L1_ARG_UNKNOWN, a data length, and a buffer pointer, e.g.
- *
- *    msg_len = sc_construct_msg( msg,
- *                                BRL1_QSIZE,
- *				  target_component,
- *                                L1_ADDR_TASK_BOGUSTASK,
- *                                L1_BOGUSTASK_REQ_BOGUSREQ,
- *                                3,
- *                                L1_ARG_UNKNOWN, 32, bufptr );
- *
- * ...passes 32 bytes of data starting at bufptr.  Note that no string or
- * "unknown"-type argument should be long enough to overflow the message
- * buffer.
- *
- * To construct a message for an L1 command that requires no arguments,
- * you'd use the following:
- *
- *    msg_len = sc_construct_msg( msg,
- *                                BRL1_QSIZE,
- *				  target_component,
- *                                L1_ADDR_TASK_BOGUSTASK,
- *                                L1_BOGUSTASK_REQ_BOGUSREQ,
- *                                0 );
- *
- * The final 0 means "no varargs".  Notice that this parameter is used to hold
- * the number of additional arguments to sc_construct_msg, _not_ the actual
- * number of arguments used by the L1 command (so 2 per L1_ARG_[INT,ASCII]
- * type argument, and 3 per L1_ARG_UNKOWN type argument).  A call to construct
- * an L1 command which required three integer arguments and two arguments of
- * some arbitrary (unknown) type would pass 12 as the value for this parameter.
- *
- * ENDIANNESS WARNING: The following code does a lot of copying back-and-forth
- * between byte arrays and four-byte big-endian integers.  Depending on the
- * system controller connection and endianness of future architectures, some
- * rewriting might be necessary.
- */
-int
-sc_construct_msg( l1sc_t  *sc,		/* system controller struct */
-		  int	   ch,           /* subchannel for this message */
-		  char    *msg,          /* message buffer */
-		  int      msg_len,      /* size of message buffer */
-                  l1addr_t addr_task,    /* target system controller task */
-                  short    req_code,     /* 16-bit request code */
-                  int      req_nargs,    /* # of arguments (varargs) passed */
-                  ... )                 /* any additional parameters */
-{
-    uint32_t buf32;   /* 32-bit buffer used to bounce things around */
-    void *bufptr;       /* used to hold command argument addresses */
-    va_list al;         /* variable argument list */
-    int index;          /* current index into msg buffer */
-    int argno;          /* current position in varargs list */
-    int l1_argno;       /* running total of arguments to l1 */
-    int l1_arg_t;       /* argument type/length */
-    int l1_argno_byte;  /* offset of argument count byte */
-
-    index = argno = 0;
-
-    /* set up destination address */
-    if( (msg_len -= sizeof( buf32 )) < 0 )
-	return -1;
-    L1_ADDRESS_TO_TASK( &buf32, sc->subch[ch].target, addr_task );
-    COPY_INT_TO_BUFFER(msg, index, buf32);
-
-    /* copy request code */
-    if( (msg_len -= 2) < 0 )
-	return( -1 );
-    msg[index++] = ((req_code >> 8) & 0xff);
-    msg[index++] = (req_code & 0xff);
-
-    if( !req_nargs ) {
-        return index;
-    }
-
-    /* reserve a byte for the argument count */
-    if( (msg_len -= 1) < 0 )
-	return( -1 );
-    l1_argno_byte = index++;
-    l1_argno = 0;
-
-    /* copy additional arguments */
-    va_start( al, req_nargs );
-    while( argno < req_nargs ) {
-        l1_argno++;
-        l1_arg_t = va_arg( al, int ); argno++;
-        switch( l1_arg_t )
-        {
-          case L1_ARG_INT:
-	    if( (msg_len -= (sizeof( buf32 ) + 1)) < 0 )
-		return( -1 );
-            msg[index++] = L1_ARG_INT;
-            buf32 = (unsigned)va_arg( al, int ); argno++;
-	    COPY_INT_TO_BUFFER(msg, index, buf32);
-            break;
-
-          case L1_ARG_ASCII:
-            bufptr = va_arg( al, char* ); argno++;
-	    if( (msg_len -= (strlen( bufptr ) + 2)) < 0 )
-		return( -1 );
-            msg[index++] = L1_ARG_ASCII;
-            strcpy( (char *)&(msg[index]), (char *)bufptr );
-            index += (strlen( bufptr ) + 1); /* include terminating null */
-            break;
-
-	  case L1_ARG_UNKNOWN:
-              {
-                  int arglen;
-		  
-                  arglen = va_arg( al, int ); argno++;
-                  bufptr = va_arg( al, void* ); argno++;
-		  if( (msg_len -= (arglen + 1)) < 0 )
-		      return( -1 );
-                  msg[index++] = L1_ARG_UNKNOWN | arglen;
-                  BCOPY( bufptr, &(msg[index]), arglen  );
-                  index += arglen;
-		  break;
-              }
-	  
-	  default: /* unhandled argument type */
-	    return -1;
-        }
-    }
-
-    va_end( al );
-    msg[l1_argno_byte] = l1_argno;
-
-    return index;
-}
-
-
-
-/* sc_interpret_resp verifies an L1 response to a bedrock request, and
- * breaks the response data up into the constituent parts.  If the
- * response message indicates error, or if a mismatch is found in the
- * expected number and type of arguments, an error is returned.  The
- * arguments to this function work very much like the arguments to
- * sc_construct_msg, above, except that L1_ARG_INTs must be followed
- * by a _pointer_ to an integer that can be filled in by this function.
- */
-int
-sc_interpret_resp( char *resp,          /* buffer received from L1 */
-                   int   resp_nargs,    /* number of _varargs_ passed in */
-                   ... )
-{
-    uint32_t buf32;   /* 32-bit buffer used to bounce things around */
-    void *bufptr;       /* used to hold response field addresses */
-    va_list al;         /* variable argument list */
-    int index;          /* current index into response buffer */
-    int argno;          /* current position in varargs list */
-    int l1_fldno;       /* number of resp fields received from l1 */
-    int l1_fld_t;       /* field type/length */
-
-    index = argno = 0;
-
-#if defined(L1_DEBUG)
-#define DUMP_RESP							  \
-    {									  \
-	int ix;								  \
-        char outbuf[512];						  \
-        sprintf( outbuf, "sc_interpret_resp error line %d: ", __LINE__ ); \
-	for( ix = 0; ix < 16; ix++ ) {					  \
-	    sprintf( &outbuf[strlen(outbuf)], "%x ", resp[ix] );	  \
-	}								  \
-	printk( "%s\n", outbuf );					  \
-    }
-#else
-#define DUMP_RESP
-#endif /* L1_DEBUG */
-
-    /* check response code */
-    COPY_BUFFER_TO_INT(resp, index, buf32);
-    if( buf32 != L1_RESP_OK ) {
-	DUMP_RESP;
-        return buf32;
-    }
-
-    /* get number of response fields */
-    l1_fldno = resp[index++];
-
-    va_start( al, resp_nargs );
-
-    /* copy out response fields */
-    while( argno < resp_nargs ) {
-        l1_fldno--;
-        l1_fld_t = va_arg( al, int ); argno++;
-        switch( l1_fld_t )
-        {
-          case L1_ARG_INT:
-            if( resp[index++] != L1_ARG_INT ) {
-                /* type mismatch */
-		va_end( al );
-		DUMP_RESP;
-		return -1;
-            }
-            bufptr = va_arg( al, int* ); argno++;
-	    COPY_BUFFER_TO_BUFFER(resp, index, bufptr);
-            break;
-
-          case L1_ARG_ASCII:
-            if( resp[index++] != L1_ARG_ASCII ) {
-                /* type mismatch */
-		va_end( al );
-		DUMP_RESP;
-                return -1;
-            }
-            bufptr = va_arg( al, char* ); argno++;
-            strcpy( (char *)bufptr, (char *)&(resp[index]) );
-            /* include terminating null */
-            index += (strlen( &(resp[index]) ) + 1);
-            break;
-
-          default:
-	    if( (l1_fld_t & L1_ARG_UNKNOWN) == L1_ARG_UNKNOWN )
-	    {
-		int *arglen;
-		
-		arglen = va_arg( al, int* ); argno++;
-		bufptr = va_arg( al, void* ); argno++;
-		*arglen = ((resp[index++] & ~L1_ARG_UNKNOWN) & 0xff);
-		BCOPY( &(resp[index]), bufptr, *arglen  );
-		index += (*arglen);
-	    }
-	    
-	    else {
-		/* unhandled type */
-		va_end( al );
-		DUMP_RESP;
-		return -1;
-	    }
-        }
-    }
-    va_end( al );
-  
-    if( (l1_fldno != 0) || (argno != resp_nargs) ) {
-        /* wrong number of arguments */
-	DUMP_RESP;
-        return -1;
-    }
-    return 0;
-}
-
-/* sc_send takes as arguments a system controller struct, a
- * buffer which contains a Bedrock<->L1 "request" message,
- * the message length, and the subchannel (presumably obtained
- * from an earlier invocation of sc_open) over which the
- * message is to be sent.  The final argument ("wait") indicates
- * whether the send is to be performed synchronously or not.
- *
- * sc_send returns either zero or an error value.  Synchronous sends 
- * (wait != 0) will not return until the data has actually been sent
- * to the UART.  Synchronous sends generally receive privileged
- * treatment.  The intent is that they be used sparingly, for such
- * purposes as kernel printf's (the "ducons" routines).  Run-of-the-mill
- * console output and L1 requests should NOT use a non-zero value
- * for wait.
- */
-int
-sc_send( l1sc_t *sc, int ch, char *msg, int len, int wait )
-{
-    char type_and_subch;
-    int result;
-
-    if( (ch < 0) || ( ch >= BRL1_NUM_SUBCHANS) ) {
-        return SC_BADSUBCH;
-    }
-
-    /* Verify that this is an open subchannel
-     */
-    if( sc->subch[ch].use == BRL1_SUBCH_FREE ) {
-        return SC_NOPEN;
-    }
-
-    type_and_subch = (BRL1_REQUEST | ((u_char)ch));
-    result = brl1_send( sc, msg, len, type_and_subch, wait );
-
-    /* If we sent as much as we asked to, return "ok". */
-    if( result == len )
-	return( SC_SUCCESS );
-
-    /* Or, if we sent less, than either the UART is busy or
-     * we're trying to send too large a packet anyway.
-     */
-    else if( result >= 0 && result < len )
-	return( SC_BUSY );
-
-    /* Or, if something else went wrong (result < 0), then
-     * return that error value.
-     */
-    else
-	return( result );
-}
-
-/* subch_pull_msg pulls a message off the receive queue for subch
- * and places it the buffer pointed to by msg.  This routine should only
- * be called when the caller already knows a message is available on the
- * receive queue (and, in the kernel, only when the subchannel data lock
- * is held by the caller).
- */
-static void
-subch_pull_msg( brl1_sch_t *subch, char *msg, int *len )
-{
-    sc_cq_t *q;         /* receive queue */
-    int before_wrap,    /* packet may be split into two different       */
-        after_wrap;     /*   pieces to acommodate queue wraparound      */
-
-    /* pull message off the receive queue */
-    q = subch->iqp;
-
-    cq_rem( q, *len );   /* remove length byte and store */
-    cq_discard( q );     /* remove type/subch byte and discard */
-
-    if ( *len > 0 )
-	(*len)--;        /* don't count type/subch byte in length returned */
-
-    if( (q->opos + (*len)) > BRL1_QSIZE ) {
-        before_wrap = BRL1_QSIZE - q->opos;
-        after_wrap = (*len) - before_wrap;
-    }
-    else {
-        before_wrap = (*len);
-        after_wrap = 0;
-    }
-
-    BCOPY( q->buf + q->opos, msg, before_wrap  );
-    if( after_wrap ) {
-        BCOPY( q->buf, msg + before_wrap, after_wrap  );
-	q->opos = after_wrap;
-    }
-    else {
-	q->opos = ((q->opos + before_wrap) & (BRL1_QSIZE - 1));
-    }
-    atomic_dec(&(subch->packet_arrived));
-}
-
-
-/* sc_recv_poll can be called as a blocking or non-blocking function;
- * it attempts to pull a message off of the subchannel specified
- * in the argument list (ch).
- *
- * The "block" argument, if non-zero, is interpreted as a timeout
- * delay (to avoid permanent waiting).
- */
-
-int
-sc_recv_poll( l1sc_t *sc, int ch, char *msg, int *len, uint64_t block )
-{
-    int is_msg = 0;
-    unsigned long pl = 0;
-    brl1_sch_t *subch = &(sc->subch[ch]);
-
-    rtc_time_t exp_time = rtc_time() + block;
-
-    /* sanity check-- make sure this is an open subchannel */
-    if( subch->use == BRL1_SUBCH_FREE )
-	return( SC_NOPEN );
-
-    do {
-
-        /* kick the next lower layer and see if it pulls anything in
-         */
-	brl1_receive( sc, SERIAL_POLLED_MODE );
-	is_msg = atomic_read(&subch->packet_arrived);
-
-    } while( block && !is_msg && (rtc_time() < exp_time) );
-
-    if( !is_msg ) {
-	/* no message and we didn't care to wait for one */
-	return( SC_NMSG );
-    }
-
-    SUBCH_DATA_LOCK( subch, pl );
-    subch_pull_msg( subch, msg, len );
-    SUBCH_DATA_UNLOCK( subch, pl );
-
-    return( SC_SUCCESS );
-}
-    
-
-/* Like sc_recv_poll, sc_recv_intr can be called in either a blocking
- * or non-blocking mode.  Rather than polling until an appointed timeout,
- * however, sc_recv_intr sleeps on a syncrhonization variable until a
- * signal from the lower layer tells us that a packet has arrived.
- *
- * sc_recv_intr can't be used with remote (router) L1s.
- */
-int
-sc_recv_intr( l1sc_t *sc, int ch, char *msg, int *len, uint64_t block )
-{
-    int is_msg = 0;
-    unsigned long pl = 0;
-    brl1_sch_t *subch = &(sc->subch[ch]);
-
-    do {
-	SUBCH_DATA_LOCK(subch, pl);
-	is_msg = atomic_read(&subch->packet_arrived);
-	if( !is_msg && block ) {
-	    /* wake me when you've got something */
-	    subch->rx_notify = sc_data_ready;
-	    sv_wait( &(subch->arrive_sv), 0, 0);
-	    if( subch->use == BRL1_SUBCH_FREE ) {
-		/* oops-- somebody closed our subchannel while we were
-		 * sleeping!
-		 */
-
-		/* no need to unlock since the channel's closed anyhow */
-		return( SC_NOPEN );
-	    }
-	}
-    } while( !is_msg && block );
-
-    if( !is_msg ) {
-	/* no message and we didn't care to wait for one */
-	SUBCH_DATA_UNLOCK( subch, pl );
-	return( SC_NMSG );
-    }
-
-    subch_pull_msg( subch, msg, len );
-    SUBCH_DATA_UNLOCK( subch, pl );
-
-    return( SC_SUCCESS );
-}
-
-/* sc_command implements a (blocking) combination of sc_send and sc_recv.
- * It is intended to be the SN1 equivalent of SN0's "elsc_command", which
- * issued a system controller command and then waited for a response from
- * the system controller before returning.
- *
- * cmd points to the outgoing command; resp points to the buffer in
- * which the response is to be stored.  Both buffers are assumed to
- * be the same length; if there is any doubt as to whether the
- * response buffer is long enough to hold the L1's response, then
- * make it BRL1_QSIZE bytes-- no Bedrock<->L1 message can be any
- * bigger.
- *
- * Be careful using the same buffer for both cmd and resp; it could get
- * hairy if there were ever an L1 command reqeuest that spanned multiple
- * packets.  (On the other hand, that would require some additional
- * rewriting of the L1 command interface anyway.)
- */
-#define __RETRIES	50
-#define __WAIT_SEND	1	// ( sc->uart != BRL1_LOCALHUB_UART )
-#define __WAIT_RECV	10000000
-
-
-int
-sc_command( l1sc_t *sc, int ch, char *cmd, char *resp, int *len )
-{
-    int result;
-    int retries;
-
-    if ( IS_RUNNING_ON_SIMULATOR() )
-    	return SC_NMSG;
-
-    retries = __RETRIES;
-
-    while( (result = sc_send( sc, ch, cmd, *len, __WAIT_SEND )) < 0 ) {
-	if( result == SC_BUSY ) {
-	    retries--;
-	    if( retries <= 0 )
-		return result;
-	    uart_delay(500);
-	}
-	else {
-	    return result;
-	}
-    }
-    
-    /* block on sc_recv_* */
-    if( (sc->uart == BRL1_LOCALHUB_UART) && L1_interrupts_connected ) {
-	return( sc_recv_intr( sc, ch, resp, len, __WAIT_RECV ) );
-    }
-    else {
-	return( sc_recv_poll( sc, ch, resp, len, __WAIT_RECV ) );
-    }
-}
-
-/* sc_command_kern is a knuckle-dragging, no-patience version of sc_command
- * used in situations where the kernel has a command that shouldn't be
- * delayed until the send buffer clears.  sc_command should be used instead
- * under most circumstances.
- */
-
-int
-sc_command_kern( l1sc_t *sc, int ch, char *cmd, char *resp, int *len )
-{
-    int result;
-
-    if ( IS_RUNNING_ON_SIMULATOR() )
-    	return SC_NMSG;
-
-    if( (result = sc_send( sc, ch, cmd, *len, 1 )) < 0 ) {
-	return result;
-    }
-
-    return( sc_recv_poll( sc, ch, resp, len, __WAIT_RECV ) );
-}
-
-
-
-/* sc_poll checks the queue corresponding to the given
- * subchannel to see if there's anything available.  If
- * not, it kicks the brl1 layer and then checks again.
- *
- * Returns 1 if input is available on the given queue,
- * 0 otherwise.
- */
-
-int
-sc_poll( l1sc_t *sc, int ch )
-{
-    brl1_sch_t *subch = &(sc->subch[ch]);
-
-    if( atomic_read(&subch->packet_arrived) )
-	return 1;
-
-    brl1_receive( sc, SERIAL_POLLED_MODE );
-
-    if( atomic_read(&subch->packet_arrived) )
-	return 1;
-
-    return 0;
-}
-
-/* for now, sc_init just calls brl1_init */
-
-void
-sc_init( l1sc_t *sc, nasid_t nasid, net_vec_t uart )
-{
-    if ( !IS_RUNNING_ON_SIMULATOR() )
-    	brl1_init( sc, nasid, uart );
-}
-
-/* sc_dispatch_env_event handles events sent from the system control
- * network's environmental monitor tasks.
- */
-
-#if	defined(LINUX_KERNEL_THREADS)
-
-static void
-sc_dispatch_env_event( uint code, int argc, char *args, int maxlen )
-{
-    int j, i = 0;
-    uint32_t ESPcode;
-
-    switch( code ) {
-	/* for now, all codes do the same thing: grab two arguments
-	 * and print a cmn_err_tag message */
-      default:
-	/* check number of arguments */
-	if( argc != 2 ) {
-	    L1_DBG_PRF(( "sc_dispatch_env_event: "
-			 "expected 2 arguments, got %d\n", argc ));
-	    return;
-	}
-	
-	/* get ESP code (integer argument) */
-	if( args[i++] != L1_ARG_INT ) {
-	    L1_DBG_PRF(( "sc_dispatch_env_event: "
-			 "expected integer argument\n" ));
-	    return;
-	}
-	/* WARNING: highly endian */
-	COPY_BUFFER_TO_INT(args, i, ESPcode);
-
-	/* verify string argument */
-	if( args[i++] != L1_ARG_ASCII ) {
-	    L1_DBG_PRF(( "sc_dispatch_env_event: "
-			 "expected an ASCII string\n" ));
-	    return;
-	}
-	for( j = i; j < maxlen; j++ ) {
-	    if( args[j] == '\0' ) break; /* found string termination */
-	}
-	if( j == maxlen ) {
-	    j--;
-	    L1_DBG_PRF(( "sc_dispatch_env_event: "
-			 "message too long-- truncating\n" ));
-	}
-
-	/* strip out trailing cr/lf */
-	for( ; 
-	     j > 1 && ((args[j-1] == 0xd) || (args[j-1] == 0xa)); 
-	     j-- );
-	args[j] = '\0';
-	
-	/* strip out leading cr/lf */
-	for( ;
-	     i < j && ((args[i] == 0xd) || (args[i] == 0xa));
-	     i++ );
-    }
-}
-
-
-/* sc_event waits for events to arrive from the system controller, and
- * prints appropriate messages to the syslog.
- */
-
-static void
-sc_event( l1sc_t *sc, int ch )
-{
-    char event[BRL1_QSIZE];
-    int i;
-    int result;
-    int event_len;
-    uint32_t ev_src;
-    uint32_t ev_code;
-    int ev_argc;
-
-    while(1) {
-	
-	bzero( event, BRL1_QSIZE );
-
-	/*
-	 * wait for an event 
-	 */
-	result = sc_recv_intr( sc, ch, event, &event_len, 1 );
-	if( result != SC_SUCCESS ) {
-	    printk(KERN_WARNING  "Error receiving sysctl event on nasid %d\n",
-		     sc->nasid );
-	}
-	else {
-	    /*
-	     * an event arrived; break it down into useful pieces
-	     */
-#if defined(L1_DEBUG) && 0
-	    int ix;
-	    printf( "Event packet received:\n" );
-	    for (ix = 0; ix < 64; ix++) {
-		printf( "%x%x ", ((event[ix] >> 4) & ((uint64_t)0xf)),
-			(event[ix] & ((uint64_t)0xf)) );
-		if( (ix % 16) == 0xf ) printf( "\n" );
-	    }
-#endif /* L1_DEBUG */
-
-	    i = 0;
-
-	    /* get event source */
-	    COPY_BUFFER_TO_INT(event, i, ev_src);
-	    COPY_BUFFER_TO_INT(event, i, ev_code);
-
-	    /* get arg count */
-	    ev_argc = (event[i++] & 0xffUL);
-	    
-	    /* dispatch events by task */
-	    switch( (ev_src & L1_ADDR_TASK_MASK) >> L1_ADDR_TASK_SHFT )
-	    {
-	      case L1_ADDR_TASK_ENV: /* environmental monitor event */
-		sc_dispatch_env_event( ev_code, ev_argc, &(event[i]), 
-				       BRL1_QSIZE - i );
-		break;
-
-	      default: /* unhandled task type */
-		L1_DBG_PRF(( "Unhandled event type received from system "
-			     "controllers: source task %x\n",
-			     (ev_src & L1_ADDR_TASK_MASK) >> L1_ADDR_TASK_SHFT
-			   ));
-	    }
-	}
-	
-    }			
-}
-
-/* sc_listen sets up a service thread to listen for incoming events.
- */
-
-void
-sc_listen( l1sc_t *sc )
-{
-    int result;
-    unsigned long pl = 0;
-    brl1_sch_t *subch;
-
-    char        msg[BRL1_QSIZE];
-    int         len;    /* length of message being sent */
-    int         ch;     /* system controller subchannel used */
-
-    extern int msc_shutdown_pri;
-
-    /* grab the designated "event subchannel" */
-    SUBCH_LOCK( sc, pl );
-    subch = &(sc->subch[BRL1_EVENT_SUBCH]);
-    if( subch->use != BRL1_SUBCH_FREE ) {
-	SUBCH_UNLOCK( sc, pl );
-	printk(KERN_WARNING  "sysctl event subchannel in use! "
-		 "Not monitoring sysctl events.\n" );
-	return;
-    }
-    subch->use = BRL1_SUBCH_RSVD;
-    SUBCH_UNLOCK( sc, pl );
-
-    atomic_set(&subch->packet_arrived, 0);
-    subch->target = BRL1_LOCALHUB_UART;
-    spin_lock_init( &(subch->data_lock) );
-    sv_init( &(subch->arrive_sv), &(subch->data_lock), SV_MON_SPIN | SV_ORDER_FIFO /* | SV_INTS */);
-    subch->tx_notify = NULL;
-    subch->rx_notify = sc_data_ready;
-    subch->iqp = snia_kmem_zalloc_node( sizeof(sc_cq_t), KM_NOSLEEP,
-				   NASID_TO_COMPACT_NODEID(sc->nasid) );
-    ASSERT( subch->iqp );
-    cq_init( subch->iqp );
-
-    /* set up a thread to listen for events */
-    sthread_create( "sysctl event handler", 0, 0, 0, msc_shutdown_pri,
-		    KT_PS, (st_func_t *) sc_event,
-		    (void *)sc, (void *)(uint64_t)BRL1_EVENT_SUBCH, 0, 0 );
-
-    /* signal the L1 to begin sending events */
-    bzero( msg, BRL1_QSIZE );
-    ch = sc_open( sc, L1_ADDR_LOCAL );
-
-    if( (len = sc_construct_msg( sc, ch, msg, BRL1_QSIZE,
-				 L1_ADDR_TASK_GENERAL,
-				 L1_REQ_EVENT_SUBCH, 2,
-				 L1_ARG_INT, BRL1_EVENT_SUBCH )) < 0 )
-    {
-	sc_close( sc, ch );
-	L1_DBG_PRF(( "Failure in sc_construct_msg (%d)\n", len ));
-	goto err_return;
-    }
-
-    result = sc_command_kern( sc, ch, msg, msg, &len );
-    if( result < 0 )
-    {
-	sc_close( sc, ch );
-	L1_DBG_PRF(( "Failure in sc_command_kern (%d)\n", result ));
-	goto err_return;
-    }
-
-    sc_close( sc, ch );
-
-    result = sc_interpret_resp( msg, 0 );
-    if( result < 0 )
-    {
-	L1_DBG_PRF(( "Failure in sc_interpret_resp (%d)\n", result ));
-	goto err_return;
-    }
-
-    /* everything went fine; just return */
-    return;
-	
-err_return:
-    /* there was a problem; complain */
-    printk(KERN_WARNING  "failed to set sysctl event-monitoring subchannel.  "
-	     "Sysctl events will not be monitored.\n" );
-}
-
-#endif	/* LINUX_KERNEL_THREADS */

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)