Root/arch/sparc/lib/GENpage.S

1/* GENpage.S: Generic clear and copy page.
2 *
3 * Copyright (C) 2007 (davem@davemloft.net)
4 */
5#include <asm/page.h>
6
7    .text
8    .align 32
9
10GENcopy_user_page:
11    set PAGE_SIZE, %g7
121: ldx [%o1 + 0x00], %o2
13    ldx [%o1 + 0x08], %o3
14    ldx [%o1 + 0x10], %o4
15    ldx [%o1 + 0x18], %o5
16    stx %o2, [%o0 + 0x00]
17    stx %o3, [%o0 + 0x08]
18    stx %o4, [%o0 + 0x10]
19    stx %o5, [%o0 + 0x18]
20    ldx [%o1 + 0x20], %o2
21    ldx [%o1 + 0x28], %o3
22    ldx [%o1 + 0x30], %o4
23    ldx [%o1 + 0x38], %o5
24    stx %o2, [%o0 + 0x20]
25    stx %o3, [%o0 + 0x28]
26    stx %o4, [%o0 + 0x30]
27    stx %o5, [%o0 + 0x38]
28    subcc %g7, 64, %g7
29    add %o1, 64, %o1
30    bne,pt %xcc, 1b
31     add %o0, 64, %o0
32    retl
33     nop
34
35GENclear_page:
36GENclear_user_page:
37    set PAGE_SIZE, %g7
381: stx %g0, [%o0 + 0x00]
39    stx %g0, [%o0 + 0x08]
40    stx %g0, [%o0 + 0x10]
41    stx %g0, [%o0 + 0x18]
42    stx %g0, [%o0 + 0x20]
43    stx %g0, [%o0 + 0x28]
44    stx %g0, [%o0 + 0x30]
45    stx %g0, [%o0 + 0x38]
46    subcc %g7, 64, %g7
47    bne,pt %xcc, 1b
48     add %o0, 64, %o0
49
50#define BRANCH_ALWAYS 0x10680000
51#define NOP 0x01000000
52#define GEN_DO_PATCH(OLD, NEW) \
53    sethi %hi(NEW), %g1; \
54    or %g1, %lo(NEW), %g1; \
55    sethi %hi(OLD), %g2; \
56    or %g2, %lo(OLD), %g2; \
57    sub %g1, %g2, %g1; \
58    sethi %hi(BRANCH_ALWAYS), %g3; \
59    sll %g1, 11, %g1; \
60    srl %g1, 11 + 2, %g1; \
61    or %g3, %lo(BRANCH_ALWAYS), %g3; \
62    or %g3, %g1, %g3; \
63    stw %g3, [%g2]; \
64    sethi %hi(NOP), %g3; \
65    or %g3, %lo(NOP), %g3; \
66    stw %g3, [%g2 + 0x4]; \
67    flush %g2;
68
69    .globl generic_patch_pageops
70    .type generic_patch_pageops,#function
71generic_patch_pageops:
72    GEN_DO_PATCH(copy_user_page, GENcopy_user_page)
73    GEN_DO_PATCH(_clear_page, GENclear_page)
74    GEN_DO_PATCH(clear_user_page, GENclear_user_page)
75    retl
76     nop
77    .size generic_patch_pageops,.-generic_patch_pageops
78

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