1/* 2 * blockops.S: Common block zero optimized routines. 3 * 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 5 */ 6 7#include <linux/linkage.h> 8#include <asm/page.h> 9 10 /* Zero out 64 bytes of memory at (buf + offset). 11 * Assumes %g1 contains zero. 12 */ 13#define BLAST_BLOCK(buf, offset) \ 14 std %g0, [buf + offset + 0x38]; \ 15 std %g0, [buf + offset + 0x30]; \ 16 std %g0, [buf + offset + 0x28]; \ 17 std %g0, [buf + offset + 0x20]; \ 18 std %g0, [buf + offset + 0x18]; \ 19 std %g0, [buf + offset + 0x10]; \ 20 std %g0, [buf + offset + 0x08]; \ 21 std %g0, [buf + offset + 0x00]; 22 23 /* Copy 32 bytes of memory at (src + offset) to 24 * (dst + offset). 25 */ 26#define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \ 27 ldd [src + offset + 0x18], t0; \ 28 ldd [src + offset + 0x10], t2; \ 29 ldd [src + offset + 0x08], t4; \ 30 ldd [src + offset + 0x00], t6; \ 31 std t0, [dst + offset + 0x18]; \ 32 std t2, [dst + offset + 0x10]; \ 33 std t4, [dst + offset + 0x08]; \ 34 std t6, [dst + offset + 0x00]; 35 36 /* Profiling evidence indicates that memset() is 37 * commonly called for blocks of size PAGE_SIZE, 38 * and (2 * PAGE_SIZE) (for kernel stacks) 39 * and with a second arg of zero. We assume in 40 * all of these cases that the buffer is aligned 41 * on at least an 8 byte boundary. 42 * 43 * Therefore we special case them to make them 44 * as fast as possible. 45 */ 46 47 .text 48ENTRY(bzero_1page) 49/* NOTE: If you change the number of insns of this routine, please check 50 * arch/sparc/mm/hypersparc.S */ 51 /* %o0 = buf */ 52 or %g0, %g0, %g1 53 or %o0, %g0, %o1 54 or %g0, (PAGE_SIZE >> 8), %g2 551: 56 BLAST_BLOCK(%o0, 0x00) 57 BLAST_BLOCK(%o0, 0x40) 58 BLAST_BLOCK(%o0, 0x80) 59 BLAST_BLOCK(%o0, 0xc0) 60 subcc %g2, 1, %g2 61 bne 1b 62 add %o0, 0x100, %o0 63 64 retl 65 nop 66ENDPROC(bzero_1page) 67 68ENTRY(__copy_1page) 69/* NOTE: If you change the number of insns of this routine, please check 70 * arch/sparc/mm/hypersparc.S */ 71 /* %o0 = dst, %o1 = src */ 72 or %g0, (PAGE_SIZE >> 8), %g1 731: 74 MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 75 MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 76 MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 77 MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 78 MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 79 MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 80 MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 81 MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 82 subcc %g1, 1, %g1 83 add %o0, 0x100, %o0 84 bne 1b 85 add %o1, 0x100, %o1 86 87 retl 88 nop 89ENDPROC(__copy_1page) 90