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