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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * blockops.S: Common block zero optimized routines.
| *
| * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
| */
|
| #include <linux/linkage.h>
| #include <asm/page.h>
| #include <asm/export.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
| ENTRY(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
| ENDPROC(bzero_1page)
| EXPORT_SYMBOL(bzero_1page)
|
| ENTRY(__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
| ENDPROC(__copy_1page)
| EXPORT_SYMBOL(__copy_1page)
|
|
