patch-1.3.5 linux/include/asm-sparc/wim.h

• Lines: 57
• Date: Thu Jan 1 02:00:00 1970
• Orig file: v1.3.4/linux/include/asm-sparc/wim.h
• Orig date: Mon Mar 6 11:22:08 1995

diff -u --recursive --new-file v1.3.4/linux/include/asm-sparc/wim.h linux/include/asm-sparc/wim.h
@@ -1,56 +0,0 @@
-/* wim.h: Defines the layout of the "Window Invalid Register" on
-          Version 8 of the Sparc Architecture.
-
-   Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
-*/
-
-#ifndef __LINUX_SPARC_WIM_H
-#define __LINUX_SPARC_WIM_H
-
-#ifdef __LINUX_SPARC_V8     /* register doesn't exist on the V9 */
-
-/* The Window Invalid Register %wim, holds a set of which register
-   windows are 'valid' at this point in time.
-
-   ------------------------------------------------------------
-   |W31|W30|W29|W28|W27|W26|W25|W24|W23|....|W5|W4|W3|W2|W1|W0|
-   ------------------------------------------------------------
-
-   Each register window on the chip gets one bit. If the bit is
-   set then the window is currently 'invalid' and hardware will
-   trap if that window is entered via a 'save', 'restore', or
-   'rett' instruction. Privileged software is responsible for
-   updating this on trap fills/spills etc. Therefore if a 'save'
-   instruction is executed and it causes the Current Window
-   Pointer to equal a register window which has its bit set in
-   %wim we get a 'overflow' trap, a restore into such a register
-   invokes a window 'spill' trap.
-*/
-
-#define __LINUX_SPARC_HAS_WIM
-
-/* Macro to fine the %wim bit mask for the current window pointer */
-#define CWP_TO_WIM_MASK(cwp)  (1<<(cwp))
-
-/* Assembly version of above macro, 'cwp' and 'wimask' must be registers */
-#define ASM_CWP_TO_WIM_MASK(cwp,wimask) \
-          or  %g0, 0x1, wimask \
-          sll wimask, cwp, wimask
-
-/* Assembly macro to find if the given window is set to invalid in the %wim.
-   Again 'window', 'result', and 'scratch' must be in registers. This leaves 
-   a non-zero value in result if the window is indeed invalid. This routine
-   works because we keep exactly one window invalid at all times to maximize
-   register utilization, which means both kernel and user windows can be in
-   the register file at the same time in certain trap situations.
-*/
-#define ASM_REG_WIN_INVAL(window,result,scratch) \
-         rd  %wim, result \
-         or  %g0, 0x1, scratch \
-         sll scratch, window, scratch \
-         and scratch, result, result
-
-#endif /* !(__LINUX_SPARC_V8) */
-
-#endif  /* !(__LINUX_SPARC_WIM_H) */
-