1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 /* 1 /*
3 * blockops.S: Common block zero optimized rou 2 * blockops.S: Common block zero optimized routines.
4 * 3 *
5 * Copyright (C) 1996 David S. Miller (davem@c 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 */ 5 */
7 6
8 #include <linux/export.h> <<
9 #include <linux/linkage.h> <<
10 #include <asm/page.h> 7 #include <asm/page.h>
11 8
12 /* Zero out 64 bytes of memory at (buf 9 /* Zero out 64 bytes of memory at (buf + offset).
13 * Assumes %g1 contains zero. 10 * Assumes %g1 contains zero.
14 */ 11 */
15 #define BLAST_BLOCK(buf, offset) \ 12 #define BLAST_BLOCK(buf, offset) \
16 std %g0, [buf + offset + 0x38]; \ 13 std %g0, [buf + offset + 0x38]; \
17 std %g0, [buf + offset + 0x30]; \ 14 std %g0, [buf + offset + 0x30]; \
18 std %g0, [buf + offset + 0x28]; \ 15 std %g0, [buf + offset + 0x28]; \
19 std %g0, [buf + offset + 0x20]; \ 16 std %g0, [buf + offset + 0x20]; \
20 std %g0, [buf + offset + 0x18]; \ 17 std %g0, [buf + offset + 0x18]; \
21 std %g0, [buf + offset + 0x10]; \ 18 std %g0, [buf + offset + 0x10]; \
22 std %g0, [buf + offset + 0x08]; \ 19 std %g0, [buf + offset + 0x08]; \
23 std %g0, [buf + offset + 0x00]; 20 std %g0, [buf + offset + 0x00];
24 21
25 /* Copy 32 bytes of memory at (src + o 22 /* Copy 32 bytes of memory at (src + offset) to
26 * (dst + offset). 23 * (dst + offset).
27 */ 24 */
28 #define MIRROR_BLOCK(dst, src, offset, t0, t1, 25 #define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
29 ldd [src + offset + 0x18], t0; \ 26 ldd [src + offset + 0x18], t0; \
30 ldd [src + offset + 0x10], t2; \ 27 ldd [src + offset + 0x10], t2; \
31 ldd [src + offset + 0x08], t4; \ 28 ldd [src + offset + 0x08], t4; \
32 ldd [src + offset + 0x00], t6; \ 29 ldd [src + offset + 0x00], t6; \
33 std t0, [dst + offset + 0x18]; \ 30 std t0, [dst + offset + 0x18]; \
34 std t2, [dst + offset + 0x10]; \ 31 std t2, [dst + offset + 0x10]; \
35 std t4, [dst + offset + 0x08]; \ 32 std t4, [dst + offset + 0x08]; \
36 std t6, [dst + offset + 0x00]; 33 std t6, [dst + offset + 0x00];
37 34
38 /* Profiling evidence indicates that m 35 /* Profiling evidence indicates that memset() is
39 * commonly called for blocks of size 36 * commonly called for blocks of size PAGE_SIZE,
40 * and (2 * PAGE_SIZE) (for kernel sta 37 * and (2 * PAGE_SIZE) (for kernel stacks)
41 * and with a second arg of zero. We 38 * and with a second arg of zero. We assume in
42 * all of these cases that the buffer 39 * all of these cases that the buffer is aligned
43 * on at least an 8 byte boundary. 40 * on at least an 8 byte boundary.
44 * 41 *
45 * Therefore we special case them to m 42 * Therefore we special case them to make them
46 * as fast as possible. 43 * as fast as possible.
47 */ 44 */
48 45
49 .text 46 .text
50 ENTRY(bzero_1page) !! 47 .align 4
>> 48 .globl bzero_1page, __copy_1page
>> 49
>> 50 bzero_1page:
51 /* NOTE: If you change the number of insns of 51 /* NOTE: If you change the number of insns of this routine, please check
52 * arch/sparc/mm/hypersparc.S */ 52 * arch/sparc/mm/hypersparc.S */
53 /* %o0 = buf */ 53 /* %o0 = buf */
54 or %g0, %g0, %g1 54 or %g0, %g0, %g1
55 or %o0, %g0, %o1 55 or %o0, %g0, %o1
56 or %g0, (PAGE_SIZE >> 8), %g2 56 or %g0, (PAGE_SIZE >> 8), %g2
57 1: 57 1:
58 BLAST_BLOCK(%o0, 0x00) 58 BLAST_BLOCK(%o0, 0x00)
59 BLAST_BLOCK(%o0, 0x40) 59 BLAST_BLOCK(%o0, 0x40)
60 BLAST_BLOCK(%o0, 0x80) 60 BLAST_BLOCK(%o0, 0x80)
61 BLAST_BLOCK(%o0, 0xc0) 61 BLAST_BLOCK(%o0, 0xc0)
62 subcc %g2, 1, %g2 62 subcc %g2, 1, %g2
63 bne 1b 63 bne 1b
64 add %o0, 0x100, %o0 64 add %o0, 0x100, %o0
65 65
66 retl 66 retl
67 nop 67 nop
68 ENDPROC(bzero_1page) <<
69 EXPORT_SYMBOL(bzero_1page) <<
70 68
71 ENTRY(__copy_1page) !! 69 __copy_1page:
72 /* NOTE: If you change the number of insns of 70 /* NOTE: If you change the number of insns of this routine, please check
73 * arch/sparc/mm/hypersparc.S */ 71 * arch/sparc/mm/hypersparc.S */
74 /* %o0 = dst, %o1 = src */ 72 /* %o0 = dst, %o1 = src */
75 or %g0, (PAGE_SIZE >> 8), %g1 73 or %g0, (PAGE_SIZE >> 8), %g1
76 1: 74 1:
77 MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, 75 MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
78 MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, 76 MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
79 MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, 77 MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
80 MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, 78 MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
81 MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, 79 MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
82 MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, 80 MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
83 MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, 81 MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
84 MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, 82 MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5)
85 subcc %g1, 1, %g1 83 subcc %g1, 1, %g1
86 add %o0, 0x100, %o0 84 add %o0, 0x100, %o0
87 bne 1b 85 bne 1b
88 add %o1, 0x100, %o1 86 add %o1, 0x100, %o1
89 87
90 retl 88 retl
91 nop 89 nop
92 ENDPROC(__copy_1page) <<
93 EXPORT_SYMBOL(__copy_1page) <<
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.