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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /* * atomic64_t for 386/486 * * Copyright © 2010 Luca Barbieri */ #include <linux/linkage.h> #include <asm/alternative.h> /* if you want SMP support, implement these with real spinlocks */ .macro IRQ_SAVE reg pushfl cli .endm .macro IRQ_RESTORE reg popfl .endm #define BEGIN_IRQ_SAVE(op) \ .macro endp; \ SYM_FUNC_END(atomic64_##op##_386); \ .purgem endp; \ .endm; \ SYM_FUNC_START(atomic64_##op##_386); \ IRQ_SAVE v; #define ENDP endp #define RET_IRQ_RESTORE \ IRQ_RESTORE v; \ RET #define v %ecx BEGIN_IRQ_SAVE(read) movl (v), %eax movl 4(v), %edx RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(set) movl %ebx, (v) movl %ecx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(xchg) movl (v), %eax movl 4(v), %edx movl %ebx, (v) movl %ecx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %ecx BEGIN_IRQ_SAVE(add) addl %eax, (v) adcl %edx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %ecx BEGIN_IRQ_SAVE(add_return) addl (v), %eax adcl 4(v), %edx movl %eax, (v) movl %edx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %ecx BEGIN_IRQ_SAVE(sub) subl %eax, (v) sbbl %edx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %ecx BEGIN_IRQ_SAVE(sub_return) negl %edx negl %eax sbbl $0, %edx addl (v), %eax adcl 4(v), %edx movl %eax, (v) movl %edx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(inc) addl $1, (v) adcl $0, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(inc_return) movl (v), %eax movl 4(v), %edx addl $1, %eax adcl $0, %edx movl %eax, (v) movl %edx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(dec) subl $1, (v) sbbl $0, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(dec_return) movl (v), %eax movl 4(v), %edx subl $1, %eax sbbl $0, %edx movl %eax, (v) movl %edx, 4(v) RET_IRQ_RESTORE ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(add_unless) addl %eax, %ecx adcl %edx, %edi addl (v), %eax adcl 4(v), %edx cmpl %eax, %ecx je 3f 1: movl %eax, (v) movl %edx, 4(v) movl $1, %eax 2: RET_IRQ_RESTORE 3: cmpl %edx, %edi jne 1b xorl %eax, %eax jmp 2b ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(inc_not_zero) movl (v), %eax movl 4(v), %edx testl %eax, %eax je 3f 1: addl $1, %eax adcl $0, %edx movl %eax, (v) movl %edx, 4(v) movl $1, %eax 2: RET_IRQ_RESTORE 3: testl %edx, %edx jne 1b jmp 2b ENDP #undef v #define v %esi BEGIN_IRQ_SAVE(dec_if_positive) movl (v), %eax movl 4(v), %edx subl $1, %eax sbbl $0, %edx js 1f movl %eax, (v) movl %edx, 4(v) 1: RET_IRQ_RESTORE ENDP #undef v |