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