| /* |
| * Copyright (c) 2009 Corey Tabaka |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| #include <asm.h> |
| |
| .text |
| |
| /* This follows the x86-64 ABI, the parameters are stored in registers in the following order*/ |
| /* |
| %rdi used to pass 1st argument |
| %rsi used to pass 2nd argument |
| %rdx used to pass 3rd argument and 2nd return register |
| %rcx used to pass 4th argument |
| %r8 used to pass 5th argument |
| %r9 used to pass 6th argument |
| %rax 1st return register |
| */ |
| |
| /* int _atomic_and(int *ptr, int val); */ |
| FUNCTION(_atomic_and) |
| movq (%rdi), %rax |
| 0: |
| movq %rax, %rcx |
| andq %rsi, %rcx |
| lock |
| cmpxchgq %rcx, (%rdi) |
| jnz 1f /* static prediction: branch forward not taken */ |
| ret |
| 1: |
| jmp 0b |
| |
| |
| /* int _atomic_or(int *ptr, int val); */ |
| FUNCTION(_atomic_or) |
| |
| movq (%rdi), %rax |
| 0: |
| movq %rax, %rcx |
| orq %rsi, %rcx |
| lock |
| cmpxchgq %rcx, (%rdi) |
| jnz 1f /* static prediction: branch forward not taken */ |
| ret |
| 1: |
| jmp 0b |
| |
| /* void arch_idle(); */ |
| FUNCTION(arch_idle) |
| pushf |
| popq %rax |
| andq $0x200, %rax |
| test %rax, %rax |
| je 1f /* don't halt if local interrupts are disabled */ |
| hlt |
| 1: |
| ret |
| |