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/* $Id: blockops.S,v 1.8 1998/01/30 10:58:44 jj Exp $
* blockops.S: Common block zero optimized routines.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#include <asm/page.h>
/* Zero out 64 bytes of memory at (buf + offset).
* Assumes %g1 contains zero.
*/
#define BLAST_BLOCK(buf, offset) \
std %g0, [buf + offset + 0x38]; \
std %g0, [buf + offset + 0x30]; \
std %g0, [buf + offset + 0x28]; \
std %g0, [buf + offset + 0x20]; \
std %g0, [buf + offset + 0x18]; \
std %g0, [buf + offset + 0x10]; \
std %g0, [buf + offset + 0x08]; \
std %g0, [buf + offset + 0x00];
/* Copy 32 bytes of memory at (src + offset) to
* (dst + offset).
*/
#define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
ldd [src + offset + 0x18], t0; \
ldd [src + offset + 0x10], t2; \
ldd [src + offset + 0x08], t4; \
ldd [src + offset + 0x00], t6; \
std t0, [dst + offset + 0x18]; \
std t2, [dst + offset + 0x10]; \
std t4, [dst + offset + 0x08]; \
std t6, [dst + offset + 0x00];
/* Profiling evidence indicates that memset() is
* commonly called for blocks of size PAGE_SIZE,
* and (2 * PAGE_SIZE) (for kernel stacks)
* and with a second arg of zero. We assume in
* all of these cases that the buffer is aligned
* on at least an 8 byte boundary.
*
* Therefore we special case them to make them
* as fast as possible.
*/
.text
.align 4
.globl bzero_1page, __copy_1page
bzero_1page:
/* NOTE: If you change the number of insns of this routine, please check
* arch/sparc/mm/hypersparc.S */
/* %o0 = buf */
or %g0, %g0, %g1
or %o0, %g0, %o1
or %g0, (PAGE_SIZE >> 8), %g2
1:
BLAST_BLOCK(%o0, 0x00)
BLAST_BLOCK(%o0, 0x40)
BLAST_BLOCK(%o0, 0x80)
BLAST_BLOCK(%o0, 0xc0)
subcc %g2, 1, %g2
bne 1b
add %o0, 0x100, %o0
retl
nop
__copy_1page:
/* NOTE: If you change the number of insns of this routine, please check
* arch/sparc/mm/hypersparc.S */
/* %o0 = dst, %o1 = src */
or %g0, (PAGE_SIZE >> 8), %g1
1:
MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
subcc %g1, 1, %g1
add %o0, 0x100, %o0
bne 1b
add %o1, 0x100, %o1
retl
nop
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