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| /*
| * atomic64_t for 386/486
| *
| * Copyright © 2010 Luca Barbieri
| *
| * This program is free software; you can redistribute it and/or modify
| * it under the terms of the GNU General Public License as published by
| * the Free Software Foundation; either version 2 of the License, or
| * (at your option) any later version.
| */
|
| #include <linux/linkage.h>
| #include <asm/alternative-asm.h>
|
| /* if you want SMP support, implement these with real spinlocks */
| .macro LOCK reg
| pushfl
| cli
| .endm
|
| .macro UNLOCK reg
| popfl
| .endm
|
| #define BEGIN(op) \
| .macro endp; \
| ENDPROC(atomic64_##op##_386); \
| .purgem endp; \
| .endm; \
| ENTRY(atomic64_##op##_386); \
| LOCK v;
|
| #define ENDP endp
|
| #define RET \
| UNLOCK v; \
| ret
|
| #define RET_ENDP \
| RET; \
| ENDP
|
| #define v %ecx
| BEGIN(read)
| movl (v), %eax
| movl 4(v), %edx
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(set)
| movl %ebx, (v)
| movl %ecx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(xchg)
| movl (v), %eax
| movl 4(v), %edx
| movl %ebx, (v)
| movl %ecx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %ecx
| BEGIN(add)
| addl %eax, (v)
| adcl %edx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %ecx
| BEGIN(add_return)
| addl (v), %eax
| adcl 4(v), %edx
| movl %eax, (v)
| movl %edx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %ecx
| BEGIN(sub)
| subl %eax, (v)
| sbbl %edx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %ecx
| BEGIN(sub_return)
| negl %edx
| negl %eax
| sbbl $0, %edx
| addl (v), %eax
| adcl 4(v), %edx
| movl %eax, (v)
| movl %edx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(inc)
| addl $1, (v)
| adcl $0, 4(v)
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(inc_return)
| movl (v), %eax
| movl 4(v), %edx
| addl $1, %eax
| adcl $0, %edx
| movl %eax, (v)
| movl %edx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(dec)
| subl $1, (v)
| sbbl $0, 4(v)
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(dec_return)
| movl (v), %eax
| movl 4(v), %edx
| subl $1, %eax
| sbbl $0, %edx
| movl %eax, (v)
| movl %edx, 4(v)
| RET_ENDP
| #undef v
|
| #define v %esi
| BEGIN(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
| 3:
| cmpl %edx, %edi
| jne 1b
| xorl %eax, %eax
| jmp 2b
| ENDP
| #undef v
|
| #define v %esi
| BEGIN(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
| 3:
| testl %edx, %edx
| jne 1b
| jmp 2b
| ENDP
| #undef v
|
| #define v %esi
| BEGIN(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_ENDP
| #undef v
|
|
