90 строки
2.5 KiB
ArmAsm
90 строки
2.5 KiB
ArmAsm
/*
|
|
* 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
|