| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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); */ |
| 28 | FUNCTION(_atomic_and) |
| 29 | movl 4(%esp), %edx |
| 30 | movl (%edx), %eax |
| 31 | 0: |
| 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 |
| 38 | 1: |
| 39 | jmp 0b |
| 40 | |
| 41 | |
| 42 | /* int _atomic_or(int *ptr, int val); */ |
| 43 | FUNCTION(_atomic_or) |
| 44 | movl 4(%esp), %edx |
| 45 | movl (%edx), %eax |
| 46 | 0: |
| 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 |
| 53 | 1: |
| 54 | jmp 0b |
| 55 | |
| 56 | /* void arch_idle(); */ |
| 57 | FUNCTION(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 |
| 64 | 1: |
| 65 | ret |
| 66 | |