/* GENpage.S: Generic clear and copy page. | |
* | |
* Copyright (C) 2007 (davem@davemloft.net) | |
*/ | |
#include <asm/page.h> | |
.text | |
.align 32 | |
GENcopy_user_page: | |
set PAGE_SIZE, %g7 | |
1: ldx [%o1 + 0x00], %o2 | |
ldx [%o1 + 0x08], %o3 | |
ldx [%o1 + 0x10], %o4 | |
ldx [%o1 + 0x18], %o5 | |
stx %o2, [%o0 + 0x00] | |
stx %o3, [%o0 + 0x08] | |
stx %o4, [%o0 + 0x10] | |
stx %o5, [%o0 + 0x18] | |
ldx [%o1 + 0x20], %o2 | |
ldx [%o1 + 0x28], %o3 | |
ldx [%o1 + 0x30], %o4 | |
ldx [%o1 + 0x38], %o5 | |
stx %o2, [%o0 + 0x20] | |
stx %o3, [%o0 + 0x28] | |
stx %o4, [%o0 + 0x30] | |
stx %o5, [%o0 + 0x38] | |
subcc %g7, 64, %g7 | |
add %o1, 64, %o1 | |
bne,pt %xcc, 1b | |
add %o0, 64, %o0 | |
retl | |
nop | |
GENclear_page: | |
GENclear_user_page: | |
set PAGE_SIZE, %g7 | |
1: stx %g0, [%o0 + 0x00] | |
stx %g0, [%o0 + 0x08] | |
stx %g0, [%o0 + 0x10] | |
stx %g0, [%o0 + 0x18] | |
stx %g0, [%o0 + 0x20] | |
stx %g0, [%o0 + 0x28] | |
stx %g0, [%o0 + 0x30] | |
stx %g0, [%o0 + 0x38] | |
subcc %g7, 64, %g7 | |
bne,pt %xcc, 1b | |
add %o0, 64, %o0 | |
#define BRANCH_ALWAYS 0x10680000 | |
#define NOP 0x01000000 | |
#define GEN_DO_PATCH(OLD, NEW) \ | |
sethi %hi(NEW), %g1; \ | |
or %g1, %lo(NEW), %g1; \ | |
sethi %hi(OLD), %g2; \ | |
or %g2, %lo(OLD), %g2; \ | |
sub %g1, %g2, %g1; \ | |
sethi %hi(BRANCH_ALWAYS), %g3; \ | |
sll %g1, 11, %g1; \ | |
srl %g1, 11 + 2, %g1; \ | |
or %g3, %lo(BRANCH_ALWAYS), %g3; \ | |
or %g3, %g1, %g3; \ | |
stw %g3, [%g2]; \ | |
sethi %hi(NOP), %g3; \ | |
or %g3, %lo(NOP), %g3; \ | |
stw %g3, [%g2 + 0x4]; \ | |
flush %g2; | |
.globl generic_patch_pageops | |
.type generic_patch_pageops,#function | |
generic_patch_pageops: | |
GEN_DO_PATCH(copy_user_page, GENcopy_user_page) | |
GEN_DO_PATCH(_clear_page, GENclear_page) | |
GEN_DO_PATCH(clear_user_page, GENclear_user_page) | |
retl | |
nop | |
.size generic_patch_pageops,.-generic_patch_pageops |