diff options
Diffstat (limited to 'arch/sparc/lib/bzero.S')
| -rw-r--r-- | arch/sparc/lib/bzero.S | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/arch/sparc/lib/bzero.S b/arch/sparc/lib/bzero.S new file mode 100644 index 000000000000..c7bbae8c590f --- /dev/null +++ b/arch/sparc/lib/bzero.S | |||
| @@ -0,0 +1,158 @@ | |||
| 1 | /* bzero.S: Simple prefetching memset, bzero, and clear_user | ||
| 2 | * implementations. | ||
| 3 | * | ||
| 4 | * Copyright (C) 2005 David S. Miller <davem@davemloft.net> | ||
| 5 | */ | ||
| 6 | |||
| 7 | .text | ||
| 8 | |||
| 9 | .globl __memset | ||
| 10 | .type __memset, #function | ||
| 11 | __memset: /* %o0=buf, %o1=pat, %o2=len */ | ||
| 12 | |||
| 13 | .globl memset | ||
| 14 | .type memset, #function | ||
| 15 | memset: /* %o0=buf, %o1=pat, %o2=len */ | ||
| 16 | and %o1, 0xff, %o3 | ||
| 17 | mov %o2, %o1 | ||
| 18 | sllx %o3, 8, %g1 | ||
| 19 | or %g1, %o3, %o2 | ||
| 20 | sllx %o2, 16, %g1 | ||
| 21 | or %g1, %o2, %o2 | ||
| 22 | sllx %o2, 32, %g1 | ||
| 23 | ba,pt %xcc, 1f | ||
| 24 | or %g1, %o2, %o2 | ||
| 25 | |||
| 26 | .globl __bzero | ||
| 27 | .type __bzero, #function | ||
| 28 | __bzero: /* %o0=buf, %o1=len */ | ||
| 29 | clr %o2 | ||
| 30 | 1: mov %o0, %o3 | ||
| 31 | brz,pn %o1, __bzero_done | ||
| 32 | cmp %o1, 16 | ||
| 33 | bl,pn %icc, __bzero_tiny | ||
| 34 | prefetch [%o0 + 0x000], #n_writes | ||
| 35 | andcc %o0, 0x3, %g0 | ||
| 36 | be,pt %icc, 2f | ||
| 37 | 1: stb %o2, [%o0 + 0x00] | ||
| 38 | add %o0, 1, %o0 | ||
| 39 | andcc %o0, 0x3, %g0 | ||
| 40 | bne,pn %icc, 1b | ||
| 41 | sub %o1, 1, %o1 | ||
| 42 | 2: andcc %o0, 0x7, %g0 | ||
| 43 | be,pt %icc, 3f | ||
| 44 | stw %o2, [%o0 + 0x00] | ||
| 45 | sub %o1, 4, %o1 | ||
| 46 | add %o0, 4, %o0 | ||
| 47 | 3: and %o1, 0x38, %g1 | ||
| 48 | cmp %o1, 0x40 | ||
| 49 | andn %o1, 0x3f, %o4 | ||
| 50 | bl,pn %icc, 5f | ||
| 51 | and %o1, 0x7, %o1 | ||
| 52 | prefetch [%o0 + 0x040], #n_writes | ||
| 53 | prefetch [%o0 + 0x080], #n_writes | ||
| 54 | prefetch [%o0 + 0x0c0], #n_writes | ||
| 55 | prefetch [%o0 + 0x100], #n_writes | ||
| 56 | prefetch [%o0 + 0x140], #n_writes | ||
| 57 | 4: prefetch [%o0 + 0x180], #n_writes | ||
| 58 | stx %o2, [%o0 + 0x00] | ||
| 59 | stx %o2, [%o0 + 0x08] | ||
| 60 | stx %o2, [%o0 + 0x10] | ||
| 61 | stx %o2, [%o0 + 0x18] | ||
| 62 | stx %o2, [%o0 + 0x20] | ||
| 63 | stx %o2, [%o0 + 0x28] | ||
| 64 | stx %o2, [%o0 + 0x30] | ||
| 65 | stx %o2, [%o0 + 0x38] | ||
| 66 | subcc %o4, 0x40, %o4 | ||
| 67 | bne,pt %icc, 4b | ||
| 68 | add %o0, 0x40, %o0 | ||
| 69 | brz,pn %g1, 6f | ||
| 70 | nop | ||
| 71 | 5: stx %o2, [%o0 + 0x00] | ||
| 72 | subcc %g1, 8, %g1 | ||
| 73 | bne,pt %icc, 5b | ||
| 74 | add %o0, 0x8, %o0 | ||
| 75 | 6: brz,pt %o1, __bzero_done | ||
| 76 | nop | ||
| 77 | __bzero_tiny: | ||
| 78 | 1: stb %o2, [%o0 + 0x00] | ||
| 79 | subcc %o1, 1, %o1 | ||
| 80 | bne,pt %icc, 1b | ||
| 81 | add %o0, 1, %o0 | ||
| 82 | __bzero_done: | ||
| 83 | retl | ||
| 84 | mov %o3, %o0 | ||
| 85 | .size __bzero, .-__bzero | ||
| 86 | .size __memset, .-__memset | ||
| 87 | .size memset, .-memset | ||
| 88 | |||
| 89 | #define EX_ST(x,y) \ | ||
| 90 | 98: x,y; \ | ||
| 91 | .section .fixup; \ | ||
| 92 | .align 4; \ | ||
| 93 | 99: retl; \ | ||
| 94 | mov %o1, %o0; \ | ||
| 95 | .section __ex_table,"a";\ | ||
| 96 | .align 4; \ | ||
| 97 | .word 98b, 99b; \ | ||
| 98 | .text; \ | ||
| 99 | .align 4; | ||
| 100 | |||
| 101 | .globl __clear_user | ||
| 102 | .type __clear_user, #function | ||
| 103 | __clear_user: /* %o0=buf, %o1=len */ | ||
| 104 | brz,pn %o1, __clear_user_done | ||
| 105 | cmp %o1, 16 | ||
| 106 | bl,pn %icc, __clear_user_tiny | ||
| 107 | EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes) | ||
| 108 | andcc %o0, 0x3, %g0 | ||
| 109 | be,pt %icc, 2f | ||
| 110 | 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) | ||
| 111 | add %o0, 1, %o0 | ||
| 112 | andcc %o0, 0x3, %g0 | ||
| 113 | bne,pn %icc, 1b | ||
| 114 | sub %o1, 1, %o1 | ||
| 115 | 2: andcc %o0, 0x7, %g0 | ||
| 116 | be,pt %icc, 3f | ||
| 117 | EX_ST(stwa %g0, [%o0 + 0x00] %asi) | ||
| 118 | sub %o1, 4, %o1 | ||
| 119 | add %o0, 4, %o0 | ||
| 120 | 3: and %o1, 0x38, %g1 | ||
| 121 | cmp %o1, 0x40 | ||
| 122 | andn %o1, 0x3f, %o4 | ||
| 123 | bl,pn %icc, 5f | ||
| 124 | and %o1, 0x7, %o1 | ||
| 125 | EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes) | ||
| 126 | EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes) | ||
| 127 | EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes) | ||
| 128 | EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes) | ||
| 129 | EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes) | ||
| 130 | 4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes) | ||
| 131 | EX_ST(stxa %g0, [%o0 + 0x00] %asi) | ||
| 132 | EX_ST(stxa %g0, [%o0 + 0x08] %asi) | ||
| 133 | EX_ST(stxa %g0, [%o0 + 0x10] %asi) | ||
| 134 | EX_ST(stxa %g0, [%o0 + 0x18] %asi) | ||
| 135 | EX_ST(stxa %g0, [%o0 + 0x20] %asi) | ||
| 136 | EX_ST(stxa %g0, [%o0 + 0x28] %asi) | ||
| 137 | EX_ST(stxa %g0, [%o0 + 0x30] %asi) | ||
| 138 | EX_ST(stxa %g0, [%o0 + 0x38] %asi) | ||
| 139 | subcc %o4, 0x40, %o4 | ||
| 140 | bne,pt %icc, 4b | ||
| 141 | add %o0, 0x40, %o0 | ||
| 142 | brz,pn %g1, 6f | ||
| 143 | nop | ||
| 144 | 5: EX_ST(stxa %g0, [%o0 + 0x00] %asi) | ||
| 145 | subcc %g1, 8, %g1 | ||
| 146 | bne,pt %icc, 5b | ||
| 147 | add %o0, 0x8, %o0 | ||
| 148 | 6: brz,pt %o1, __clear_user_done | ||
| 149 | nop | ||
| 150 | __clear_user_tiny: | ||
| 151 | 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) | ||
| 152 | subcc %o1, 1, %o1 | ||
| 153 | bne,pt %icc, 1b | ||
| 154 | add %o0, 1, %o0 | ||
| 155 | __clear_user_done: | ||
| 156 | retl | ||
| 157 | clr %o0 | ||
| 158 | .size __clear_user, .-__clear_user | ||