1/* NGpage.S: Niagara optimize clear and copy page. 2 * 3 * Copyright (C) 2006 (davem@davemloft.net) 4 */ 5 6#include <asm/asi.h> 7#include <asm/page.h> 8 9 .text 10 .align 32 11 12 /* This is heavily simplified from the sun4u variants 13 * because Niagara does not have any D-cache aliasing issues 14 * and also we don't need to use the FPU in order to implement 15 * an optimal page copy/clear. 16 */ 17 18NGcopy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */ 19 save %sp, -192, %sp 20 rd %asi, %g3 21 wr %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi 22 set PAGE_SIZE, %g7 23 prefetch [%i1 + 0x00], #one_read 24 prefetch [%i1 + 0x40], #one_read 25 261: prefetch [%i1 + 0x80], #one_read 27 prefetch [%i1 + 0xc0], #one_read 28 ldda [%i1 + 0x00] %asi, %o2 29 ldda [%i1 + 0x10] %asi, %o4 30 ldda [%i1 + 0x20] %asi, %l2 31 ldda [%i1 + 0x30] %asi, %l4 32 stxa %o2, [%i0 + 0x00] %asi 33 stxa %o3, [%i0 + 0x08] %asi 34 stxa %o4, [%i0 + 0x10] %asi 35 stxa %o5, [%i0 + 0x18] %asi 36 stxa %l2, [%i0 + 0x20] %asi 37 stxa %l3, [%i0 + 0x28] %asi 38 stxa %l4, [%i0 + 0x30] %asi 39 stxa %l5, [%i0 + 0x38] %asi 40 ldda [%i1 + 0x40] %asi, %o2 41 ldda [%i1 + 0x50] %asi, %o4 42 ldda [%i1 + 0x60] %asi, %l2 43 ldda [%i1 + 0x70] %asi, %l4 44 stxa %o2, [%i0 + 0x40] %asi 45 stxa %o3, [%i0 + 0x48] %asi 46 stxa %o4, [%i0 + 0x50] %asi 47 stxa %o5, [%i0 + 0x58] %asi 48 stxa %l2, [%i0 + 0x60] %asi 49 stxa %l3, [%i0 + 0x68] %asi 50 stxa %l4, [%i0 + 0x70] %asi 51 stxa %l5, [%i0 + 0x78] %asi 52 add %i1, 128, %i1 53 subcc %g7, 128, %g7 54 bne,pt %xcc, 1b 55 add %i0, 128, %i0 56 wr %g3, 0x0, %asi 57 membar #Sync 58 ret 59 restore 60 61 .align 32 62NGclear_page: /* %o0=dest */ 63NGclear_user_page: /* %o0=dest, %o1=vaddr */ 64 rd %asi, %g3 65 wr %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi 66 set PAGE_SIZE, %g7 67 681: stxa %g0, [%o0 + 0x00] %asi 69 stxa %g0, [%o0 + 0x08] %asi 70 stxa %g0, [%o0 + 0x10] %asi 71 stxa %g0, [%o0 + 0x18] %asi 72 stxa %g0, [%o0 + 0x20] %asi 73 stxa %g0, [%o0 + 0x28] %asi 74 stxa %g0, [%o0 + 0x30] %asi 75 stxa %g0, [%o0 + 0x38] %asi 76 stxa %g0, [%o0 + 0x40] %asi 77 stxa %g0, [%o0 + 0x48] %asi 78 stxa %g0, [%o0 + 0x50] %asi 79 stxa %g0, [%o0 + 0x58] %asi 80 stxa %g0, [%o0 + 0x60] %asi 81 stxa %g0, [%o0 + 0x68] %asi 82 stxa %g0, [%o0 + 0x70] %asi 83 stxa %g0, [%o0 + 0x78] %asi 84 stxa %g0, [%o0 + 0x80] %asi 85 stxa %g0, [%o0 + 0x88] %asi 86 stxa %g0, [%o0 + 0x90] %asi 87 stxa %g0, [%o0 + 0x98] %asi 88 stxa %g0, [%o0 + 0xa0] %asi 89 stxa %g0, [%o0 + 0xa8] %asi 90 stxa %g0, [%o0 + 0xb0] %asi 91 stxa %g0, [%o0 + 0xb8] %asi 92 stxa %g0, [%o0 + 0xc0] %asi 93 stxa %g0, [%o0 + 0xc8] %asi 94 stxa %g0, [%o0 + 0xd0] %asi 95 stxa %g0, [%o0 + 0xd8] %asi 96 stxa %g0, [%o0 + 0xe0] %asi 97 stxa %g0, [%o0 + 0xe8] %asi 98 stxa %g0, [%o0 + 0xf0] %asi 99 stxa %g0, [%o0 + 0xf8] %asi 100 subcc %g7, 256, %g7 101 bne,pt %xcc, 1b 102 add %o0, 256, %o0 103 wr %g3, 0x0, %asi 104 membar #Sync 105 retl 106 nop 107 108#define BRANCH_ALWAYS 0x10680000 109#define NOP 0x01000000 110#define NG_DO_PATCH(OLD, NEW) \ 111 sethi %hi(NEW), %g1; \ 112 or %g1, %lo(NEW), %g1; \ 113 sethi %hi(OLD), %g2; \ 114 or %g2, %lo(OLD), %g2; \ 115 sub %g1, %g2, %g1; \ 116 sethi %hi(BRANCH_ALWAYS), %g3; \ 117 sll %g1, 11, %g1; \ 118 srl %g1, 11 + 2, %g1; \ 119 or %g3, %lo(BRANCH_ALWAYS), %g3; \ 120 or %g3, %g1, %g3; \ 121 stw %g3, [%g2]; \ 122 sethi %hi(NOP), %g3; \ 123 or %g3, %lo(NOP), %g3; \ 124 stw %g3, [%g2 + 0x4]; \ 125 flush %g2; 126 127 .globl niagara_patch_pageops 128 .type niagara_patch_pageops,#function 129niagara_patch_pageops: 130 NG_DO_PATCH(copy_user_page, NGcopy_user_page) 131 NG_DO_PATCH(_clear_page, NGclear_page) 132 NG_DO_PATCH(clear_user_page, NGclear_user_page) 133 retl 134 nop 135 .size niagara_patch_pageops,.-niagara_patch_pageops 136