1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* bzero.S: Simple prefetching memset, bzero, and clear_user 3 * implementations. 4 * 5 * Copyright (C) 2005 David S. Miller <davem@davemloft.net> 6 */ 7 8 #include <linux/export.h> 9 #include <linux/linkage.h> 10 11 .text 12 13 ENTRY(memset) /* %o0=buf, %o1=pat, %o2=len */ 14 and %o1, 0xff, %o3 15 mov %o2, %o1 16 sllx %o3, 8, %g1 17 or %g1, %o3, %o2 18 sllx %o2, 16, %g1 19 or %g1, %o2, %o2 20 sllx %o2, 32, %g1 21 ba,pt %xcc, 1f 22 or %g1, %o2, %o2 23 24 ENTRY(__bzero) /* %o0=buf, %o1=len */ 25 clr %o2 26 1: mov %o0, %o3 27 brz,pn %o1, __bzero_done 28 cmp %o1, 16 29 bl,pn %icc, __bzero_tiny 30 prefetch [%o0 + 0x000], #n_writes 31 andcc %o0, 0x3, %g0 32 be,pt %icc, 2f 33 1: stb %o2, [%o0 + 0x00] 34 add %o0, 1, %o0 35 andcc %o0, 0x3, %g0 36 bne,pn %icc, 1b 37 sub %o1, 1, %o1 38 2: andcc %o0, 0x7, %g0 39 be,pt %icc, 3f 40 stw %o2, [%o0 + 0x00] 41 sub %o1, 4, %o1 42 add %o0, 4, %o0 43 3: and %o1, 0x38, %g1 44 cmp %o1, 0x40 45 andn %o1, 0x3f, %o4 46 bl,pn %icc, 5f 47 and %o1, 0x7, %o1 48 prefetch [%o0 + 0x040], #n_writes 49 prefetch [%o0 + 0x080], #n_writes 50 prefetch [%o0 + 0x0c0], #n_writes 51 prefetch [%o0 + 0x100], #n_writes 52 prefetch [%o0 + 0x140], #n_writes 53 4: prefetch [%o0 + 0x180], #n_writes 54 stx %o2, [%o0 + 0x00] 55 stx %o2, [%o0 + 0x08] 56 stx %o2, [%o0 + 0x10] 57 stx %o2, [%o0 + 0x18] 58 stx %o2, [%o0 + 0x20] 59 stx %o2, [%o0 + 0x28] 60 stx %o2, [%o0 + 0x30] 61 stx %o2, [%o0 + 0x38] 62 subcc %o4, 0x40, %o4 63 bne,pt %icc, 4b 64 add %o0, 0x40, %o0 65 brz,pn %g1, 6f 66 nop 67 5: stx %o2, [%o0 + 0x00] 68 subcc %g1, 8, %g1 69 bne,pt %icc, 5b 70 add %o0, 0x8, %o0 71 6: brz,pt %o1, __bzero_done 72 nop 73 __bzero_tiny: 74 1: stb %o2, [%o0 + 0x00] 75 subcc %o1, 1, %o1 76 bne,pt %icc, 1b 77 add %o0, 1, %o0 78 __bzero_done: 79 retl 80 mov %o3, %o0 81 ENDPROC(__bzero) 82 ENDPROC(memset) 83 EXPORT_SYMBOL(__bzero) 84 EXPORT_SYMBOL(memset) 85 86 #define EX_ST(x,y) \ 87 98: x,y; \ 88 .section __ex_table,"a";\ 89 .align 4; \ 90 .word 98b, __retl_o1; \ 91 .text; \ 92 .align 4; 93 94 ENTRY(__clear_user) /* %o0=buf, %o1=len */ 95 brz,pn %o1, __clear_user_done 96 cmp %o1, 16 97 bl,pn %icc, __clear_user_tiny 98 EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes) 99 andcc %o0, 0x3, %g0 100 be,pt %icc, 2f 101 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) 102 add %o0, 1, %o0 103 andcc %o0, 0x3, %g0 104 bne,pn %icc, 1b 105 sub %o1, 1, %o1 106 2: andcc %o0, 0x7, %g0 107 be,pt %icc, 3f 108 EX_ST(stwa %g0, [%o0 + 0x00] %asi) 109 sub %o1, 4, %o1 110 add %o0, 4, %o0 111 3: and %o1, 0x38, %g1 112 cmp %o1, 0x40 113 andn %o1, 0x3f, %o4 114 bl,pn %icc, 5f 115 and %o1, 0x7, %o1 116 EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes) 117 EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes) 118 EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes) 119 EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes) 120 EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes) 121 4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes) 122 EX_ST(stxa %g0, [%o0 + 0x00] %asi) 123 EX_ST(stxa %g0, [%o0 + 0x08] %asi) 124 EX_ST(stxa %g0, [%o0 + 0x10] %asi) 125 EX_ST(stxa %g0, [%o0 + 0x18] %asi) 126 EX_ST(stxa %g0, [%o0 + 0x20] %asi) 127 EX_ST(stxa %g0, [%o0 + 0x28] %asi) 128 EX_ST(stxa %g0, [%o0 + 0x30] %asi) 129 EX_ST(stxa %g0, [%o0 + 0x38] %asi) 130 subcc %o4, 0x40, %o4 131 bne,pt %icc, 4b 132 add %o0, 0x40, %o0 133 brz,pn %g1, 6f 134 nop 135 5: EX_ST(stxa %g0, [%o0 + 0x00] %asi) 136 subcc %g1, 8, %g1 137 bne,pt %icc, 5b 138 add %o0, 0x8, %o0 139 6: brz,pt %o1, __clear_user_done 140 nop 141 __clear_user_tiny: 142 1: EX_ST(stba %g0, [%o0 + 0x00] %asi) 143 subcc %o1, 1, %o1 144 bne,pt %icc, 1b 145 add %o0, 1, %o0 146 __clear_user_done: 147 retl 148 clr %o0 149 ENDPROC(__clear_user) 150 EXPORT_SYMBOL(__clear_user)
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.