Commit | Line | Data |
---|---|---|
88278ca2 | 1 | /* |
1da177e4 LT |
2 | * blockops.S: Common block zero optimized routines. |
3 | * | |
4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | */ | |
6 | ||
7 | #include <asm/page.h> | |
8 | ||
9 | /* Zero out 64 bytes of memory at (buf + offset). | |
10 | * Assumes %g1 contains zero. | |
11 | */ | |
12 | #define BLAST_BLOCK(buf, offset) \ | |
13 | std %g0, [buf + offset + 0x38]; \ | |
14 | std %g0, [buf + offset + 0x30]; \ | |
15 | std %g0, [buf + offset + 0x28]; \ | |
16 | std %g0, [buf + offset + 0x20]; \ | |
17 | std %g0, [buf + offset + 0x18]; \ | |
18 | std %g0, [buf + offset + 0x10]; \ | |
19 | std %g0, [buf + offset + 0x08]; \ | |
20 | std %g0, [buf + offset + 0x00]; | |
21 | ||
22 | /* Copy 32 bytes of memory at (src + offset) to | |
23 | * (dst + offset). | |
24 | */ | |
25 | #define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \ | |
26 | ldd [src + offset + 0x18], t0; \ | |
27 | ldd [src + offset + 0x10], t2; \ | |
28 | ldd [src + offset + 0x08], t4; \ | |
29 | ldd [src + offset + 0x00], t6; \ | |
30 | std t0, [dst + offset + 0x18]; \ | |
31 | std t2, [dst + offset + 0x10]; \ | |
32 | std t4, [dst + offset + 0x08]; \ | |
33 | std t6, [dst + offset + 0x00]; | |
34 | ||
35 | /* Profiling evidence indicates that memset() is | |
36 | * commonly called for blocks of size PAGE_SIZE, | |
37 | * and (2 * PAGE_SIZE) (for kernel stacks) | |
38 | * and with a second arg of zero. We assume in | |
39 | * all of these cases that the buffer is aligned | |
40 | * on at least an 8 byte boundary. | |
41 | * | |
42 | * Therefore we special case them to make them | |
43 | * as fast as possible. | |
44 | */ | |
45 | ||
46 | .text | |
47 | .align 4 | |
48 | .globl bzero_1page, __copy_1page | |
49 | ||
50 | bzero_1page: | |
51 | /* NOTE: If you change the number of insns of this routine, please check | |
52 | * arch/sparc/mm/hypersparc.S */ | |
53 | /* %o0 = buf */ | |
54 | or %g0, %g0, %g1 | |
55 | or %o0, %g0, %o1 | |
56 | or %g0, (PAGE_SIZE >> 8), %g2 | |
57 | 1: | |
58 | BLAST_BLOCK(%o0, 0x00) | |
59 | BLAST_BLOCK(%o0, 0x40) | |
60 | BLAST_BLOCK(%o0, 0x80) | |
61 | BLAST_BLOCK(%o0, 0xc0) | |
62 | subcc %g2, 1, %g2 | |
63 | bne 1b | |
64 | add %o0, 0x100, %o0 | |
65 | ||
66 | retl | |
67 | nop | |
68 | ||
69 | __copy_1page: | |
70 | /* NOTE: If you change the number of insns of this routine, please check | |
71 | * arch/sparc/mm/hypersparc.S */ | |
72 | /* %o0 = dst, %o1 = src */ | |
73 | or %g0, (PAGE_SIZE >> 8), %g1 | |
74 | 1: | |
75 | MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
76 | MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
77 | MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
78 | MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
79 | MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
80 | MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
81 | MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
82 | MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) | |
83 | subcc %g1, 1, %g1 | |
84 | add %o0, 0x100, %o0 | |
85 | bne 1b | |
86 | add %o1, 0x100, %o1 | |
87 | ||
88 | retl | |
89 | nop |