1/*
2 * Copyright (c) 2009 Corey Tabaka
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23#include <asm.h>
24
25.text
26
27/* int _atomic_and(int *ptr, int val); */
28FUNCTION(_atomic_and)
29    movl 4(%esp), %edx
30    movl (%edx), %eax
310:
32    movl %eax, %ecx
33    andl 8(%esp), %ecx
34    lock
35    cmpxchgl %ecx, (%edx)
36    jnz 1f                  /* static prediction: branch forward not taken */
37    ret
381:
39    jmp 0b
40
41
42/* int _atomic_or(int *ptr, int val); */
43FUNCTION(_atomic_or)
44movl 4(%esp), %edx
45    movl (%edx), %eax
460:
47    movl %eax, %ecx
48    orl 8(%esp), %ecx
49    lock
50    cmpxchgl %ecx, (%edx)
51    jnz 1f                  /* static prediction: branch forward not taken */
52    ret
531:
54    jmp 0b
55
56/* void arch_idle(); */
57FUNCTION(arch_idle)
58    pushf
59    popl %eax
60    andl $0x200, %eax
61    test %eax, %eax
62    je 1f                   /* don't halt if local interrupts are disabled */
63    hlt
641:
65    ret
66
67