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Hand-tuned pmap_zero_page().

This commit is contained in:
thorpej 1999-12-17 07:24:05 +00:00
parent be68900e77
commit 6926d0d4b1
1 changed files with 38 additions and 5 deletions
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43
sys/arch/alpha/alpha/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.122 1999/12/02 23:40:27 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.123 1999/12/17 07:24:05 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@ -154,7 +154,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.122 1999/12/02 23:40:27 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.123 1999/12/17 07:24:05 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -2331,14 +2331,47 @@ void
pmap_zero_page(phys)
paddr_t phys;
{
caddr_t p;
u_long *p0, *p1, *pend;
#ifdef DEBUG
if (pmapdebug & PDB_FOLLOW)
printf("pmap_zero_page(%lx)\n", phys);
#endif
p = (caddr_t)ALPHA_PHYS_TO_K0SEG(phys);
bzero(p, PAGE_SIZE);
p0 = (u_long *)ALPHA_PHYS_TO_K0SEG(phys);
pend = (u_long *)((u_long)p0 + PAGE_SIZE);
/*
* Unroll the loop a bit, doing 16 quadwords per iteration.
* Do only 8 back-to-back stores, and alternate registers.
*/
do {
__asm __volatile(
"# BEGIN loop body\n"
" addq %2, (8 * 8), %1 \n"
" stq $31, (0 * 8)(%0) \n"
" stq $31, (1 * 8)(%0) \n"
" stq $31, (2 * 8)(%0) \n"
" stq $31, (3 * 8)(%0) \n"
" stq $31, (4 * 8)(%0) \n"
" stq $31, (5 * 8)(%0) \n"
" stq $31, (6 * 8)(%0) \n"
" stq $31, (7 * 8)(%0) \n"
" \n"
" addq %3, (8 * 8), %0 \n"
" stq $31, (0 * 8)(%1) \n"
" stq $31, (1 * 8)(%1) \n"
" stq $31, (2 * 8)(%1) \n"
" stq $31, (3 * 8)(%1) \n"
" stq $31, (4 * 8)(%1) \n"
" stq $31, (5 * 8)(%1) \n"
" stq $31, (6 * 8)(%1) \n"
" stq $31, (7 * 8)(%1) \n"
" # END loop body"
: "=r" (p0), "=r" (p1)
: "0" (p0), "1" (p1)
: "memory");
} while (p0 < pend);
}
/*