patch-2.4.22 linux-2.4.22/arch/ppc/mm/4xx_tlb.c

• Lines: 359
• Date: 1969-12-31 16:00:00.000000000 -0800
• Orig file: linux-2.4.21/arch/ppc/mm/4xx_tlb.c
• Orig date: 2003-06-13 07:51:31.000000000 -0700

diff -urN linux-2.4.21/arch/ppc/mm/4xx_tlb.c linux-2.4.22/arch/ppc/mm/4xx_tlb.c
@@ -1,358 +0,0 @@
-/*
- *
- *    Copyright (c) 1998-1999 TiVo, Inc.
- *      Original implementation.
- *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
- *      Minor rework.
- *
- *    Module name: 4xx_tlb.c
- *
- *    Description:
- *      Routines for manipulating the TLB on PowerPC 400-class processors.
- *
- */
-
-#include <linux/mm.h>
-
-#include <asm/processor.h>
-#include <asm/io.h>
-#include <asm/mmu.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-
-
-/* Preprocessor Defines */
-
-#if !defined(TRUE) || TRUE != 1
-#define TRUE    1
-#endif
-
-#if !defined(FALSE) || FALSE != 0
-#define FALSE   0
-#endif
-
-
-/* Global Variables */
-
-static int pinned = 0;
-
-
-/* Function Prototypes */
-
-static int PPC4xx_tlb_miss(struct pt_regs *, unsigned long, int);
-
-extern void do_page_fault(struct pt_regs *, unsigned long, unsigned long);
-
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-static inline void
-PPC4xx_tlb_write(unsigned long tag, unsigned long data, unsigned int index)
-{
-	asm("tlbwe %0,%1,1" : : "r" (data), "r" (index));
-	asm("tlbwe %0,%1,0" : : "r" (tag), "r" (index));
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-void
-PPC4xx_flush_tlb_all(void)
-{
-	int i;
-	unsigned long flags, pid;
-
-	save_flags(flags);
-	cli();
-
-	pid = mfspr(SPRN_PID);
-	mtspr(SPRN_PID, 0);
-
-	for (i = pinned; i < PPC4XX_TLB_SIZE; i++) {
-		PPC4xx_tlb_write(0, 0, i);
-	}
-	asm("sync;isync");
-
-	mtspr(SPRN_PID, pid);
-	restore_flags(flags);
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-void
-PPC4xx_dtlb_miss(struct pt_regs *regs)
-{
-	unsigned long addr = mfspr(SPRN_DEAR);
-	int write = mfspr(SPRN_ESR) & ESR_DST;
-
-	if (PPC4xx_tlb_miss(regs, addr, write) < 0) {
-		sti();
-		do_page_fault(regs, addr, write);
-		cli();
-	}
-	
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-void
-PPC4xx_itlb_miss(struct pt_regs *regs)
-{
-	unsigned long addr = regs->nip;
-
-	if (PPC4xx_tlb_miss(regs, addr, 0) < 0) {
-		sti();
-		do_page_fault(regs, addr, 0);
-		cli();
-	}
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-void
-PPC4xx_tlb_pin(unsigned long va, unsigned long pa, int pagesz, int cache)
-{
-	unsigned long tag, data;
-	unsigned long opid;
-
-	if (pinned >= PPC4XX_TLB_SIZE)
-		return;
-
-	opid = mfspr(SPRN_PID);
-	mtspr(SPRN_PID, 0);
-
-	data = (pa & TLB_RPN_MASK) | TLB_WR;
-
-	if (cache)
-		data |= (TLB_EX);
-	else
-		data |= (TLB_G | TLB_I);
-
-	tag = (va & TLB_EPN_MASK) | TLB_VALID | pagesz;
-
-	PPC4xx_tlb_write(tag, data, pinned++);
-
-	mtspr(SPRN_PID, opid);
-	return;
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-void
-PPC4xx_tlb_unpin(unsigned long va, unsigned long pa, int size)
-{
-	/* XXX - To be implemented. */
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-static inline void
-PPC4xx_tlb_update(unsigned long addr, pte_t *pte)
-{
-        unsigned long data, tag, rand;
-        int i, found = 1;
-
-        /* Construct the hardware TLB entry from the Linux-style PTE */
-
-        tag = tag = (addr & PAGE_MASK) | TLB_VALID | TLB_PAGESZ(PAGESZ_4K);
-        data = data = (pte_val(*pte) & PAGE_MASK) | TLB_EX | TLB_WR;
-
-#if 0
-        if (pte_val(*pte) & _PAGE_HWWRITE)
-                data |= TLB_WR;
-#endif
-
-        if (pte_val(*pte) & _PAGE_NO_CACHE)
-                data |= TLB_I;
-
-        if (pte_val(*pte) & _PAGE_GUARDED)
-                data |= TLB_G;
-
-        if (addr < KERNELBASE)
-                data |= TLB_ZSEL(1);
-
-        /* Attempt to match the new tag to an existing entry in the TLB. */
-
-        asm("tlbsx. %0,0,%2;"
-	    "beq 1f;"
-	    "li %1,0;1:" : "=r" (i), "=r" (found) : "r" (tag));
-
-	/*
-	 * If we found a match for the tag, reuse the entry index and update
-	 * the tag and data portions. Otherwise, we did not find a match. Use
-	 * the lower 5 bits of the lower time base register as a pseudo-random
-	 * index into the TLB and replace the entry at that index.
-	 */
-
-        if (found) {
-		PPC4xx_tlb_write(tag, data, i);
-        } else {
-		rand = mfspr(SPRN_TBLO) & (PPC4XX_TLB_SIZE - 1);
-		rand += pinned;
-		if (rand >= PPC4XX_TLB_SIZE)
-			rand -= pinned;
-
-		PPC4xx_tlb_write(tag, data, rand);
-		asm("isync;sync");
-        }
-}
-
-/*
- * ()
- *
- * Description:
- *   This routine...
- *
- * Input(s):
- *
- *
- * Output(s):
- *
- *
- * Returns:
- *
- *
- */
-static int
-PPC4xx_tlb_miss(struct pt_regs *regs, unsigned long addr, int write)
-{
-        unsigned long spid, ospid;
-        struct mm_struct *mm;
-        pgd_t *pgd;
-        pmd_t *pmd;
-        pte_t *pte;
-
-        if (!user_mode(regs) && (addr >= KERNELBASE)) {
-                mm = &init_mm;
-                spid = 0;
-        } else {
-                mm = current->mm;
-                spid = mfspr(SPRN_PID);
-        }
-
-        pgd = pgd_offset(mm, addr);
-        if (pgd_none(*pgd))
-                goto bad;
-
-        pmd = pmd_offset(pgd, addr);
-        if (pmd_none(*pmd))
-                goto bad;
-
-        pte = pte_offset(pmd, addr);
-        if (pte_none(*pte) || !pte_present(*pte))
-                goto bad;
-
-        if (write) {
-                if (!pte_write(*pte))
-                        goto bad;
-
-                set_pte(pte, pte_mkdirty(*pte));
-        }
-        set_pte(pte, pte_mkyoung(*pte));
-
-        ospid = mfspr(SPRN_PID);
-        mtspr(SPRN_PID, spid);
-        PPC4xx_tlb_update(addr, pte);
-        mtspr(SPRN_PID, ospid);
-
-	return (0);
-bad:
-	return (-1);
-}