1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* GENpage.S: Generic clear and copy page.
3 *
4 * Copyright (C) 2007 (davem@davemloft.net)
5 */
6 #include <asm/page.h>
7
8 .text
9 .align 32
10
11 GENcopy_user_page:
12 set PAGE_SIZE, %g7
13 1: ldx [%o1 + 0x00], %o2
14 ldx [%o1 + 0x08], %o3
15 ldx [%o1 + 0x10], %o4
16 ldx [%o1 + 0x18], %o5
17 stx %o2, [%o0 + 0x00]
18 stx %o3, [%o0 + 0x08]
19 stx %o4, [%o0 + 0x10]
20 stx %o5, [%o0 + 0x18]
21 ldx [%o1 + 0x20], %o2
22 ldx [%o1 + 0x28], %o3
23 ldx [%o1 + 0x30], %o4
24 ldx [%o1 + 0x38], %o5
25 stx %o2, [%o0 + 0x20]
26 stx %o3, [%o0 + 0x28]
27 stx %o4, [%o0 + 0x30]
28 stx %o5, [%o0 + 0x38]
29 subcc %g7, 64, %g7
30 add %o1, 64, %o1
31 bne,pt %xcc, 1b
32 add %o0, 64, %o0
33 retl
34 nop
35
36 GENclear_page:
37 GENclear_user_page:
38 set PAGE_SIZE, %g7
39 1: stx %g0, [%o0 + 0x00]
40 stx %g0, [%o0 + 0x08]
41 stx %g0, [%o0 + 0x10]
42 stx %g0, [%o0 + 0x18]
43 stx %g0, [%o0 + 0x20]
44 stx %g0, [%o0 + 0x28]
45 stx %g0, [%o0 + 0x30]
46 stx %g0, [%o0 + 0x38]
47 subcc %g7, 64, %g7
48 bne,pt %xcc, 1b
49 add %o0, 64, %o0
50
51 #define BRANCH_ALWAYS 0x10680000
52 #define NOP 0x01000000
53 #define GEN_DO_PATCH(OLD, NEW) \
54 sethi %hi(NEW), %g1; \
55 or %g1, %lo(NEW), %g1; \
56 sethi %hi(OLD), %g2; \
57 or %g2, %lo(OLD), %g2; \
58 sub %g1, %g2, %g1; \
59 sethi %hi(BRANCH_ALWAYS), %g3; \
60 sll %g1, 11, %g1; \
61 srl %g1, 11 + 2, %g1; \
62 or %g3, %lo(BRANCH_ALWAYS), %g3;
63 or %g3, %g1, %g3; \
64 stw %g3, [%g2]; \
65 sethi %hi(NOP), %g3; \
66 or %g3, %lo(NOP), %g3; \
67 stw %g3, [%g2 + 0x4]; \
68 flush %g2;
69
70 .globl generic_patch_pageops
71 .type generic_patch_pageops,#functio
72 generic_patch_pageops:
73 GEN_DO_PATCH(copy_user_page, GENcopy_u
74 GEN_DO_PATCH(_clear_page, GENclear_pag
75 GEN_DO_PATCH(clear_user_page, GENclear
76 retl
77 nop
78 .size generic_patch_pageops,.-generi
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.