| /* |
| * 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 |
| |
| /* void arch_enable_ints(void); */ |
| FUNCTION(arch_enable_ints) |
| sti |
| ret |
| |
| /* void arch_disable_ints(void); */ |
| FUNCTION(arch_disable_ints) |
| cli |
| ret |
| |
| /* int atomic_swap(int *ptr, int val); */ |
| FUNCTION(atomic_swap) |
| movl 4(%esp), %edx |
| movl 8(%esp), %eax |
| xchgl %eax, (%edx) |
| ret |
| |
| /* int atomic_add(int *ptr, int val); */ |
| FUNCTION(atomic_add) |
| movl 4(%esp), %edx |
| movl 8(%esp), %eax |
| lock |
| xadd %eax, (%edx) |
| ret |
| |
| /* int atomic_and(int *ptr, int val); */ |
| FUNCTION(atomic_and) |
| movl 4(%esp), %edx |
| movl (%edx), %eax |
| 0: |
| movl %eax, %ecx |
| andl 8(%esp), %ecx |
| lock |
| cmpxchgl %ecx, (%edx) |
| jnz 1f /* static prediction: branch forward not taken */ |
| ret |
| 1: |
| jmp 0b |
| |
| |
| /* int atomic_or(int *ptr, int val); */ |
| FUNCTION(atomic_or) |
| movl 4(%esp), %edx |
| movl (%edx), %eax |
| 0: |
| movl %eax, %ecx |
| orl 8(%esp), %ecx |
| lock |
| cmpxchgl %ecx, (%edx) |
| jnz 1f /* static prediction: branch forward not taken */ |
| ret |
| 1: |
| jmp 0b |
| |
| /* void arch_idle(); */ |
| FUNCTION(arch_idle) |
| pushf |
| popl %eax |
| andl $0x200, %eax |
| test %eax, %eax |
| je 1f /* don't halt if local interrupts are disabled */ |
| hlt |
| 1: |
| ret |
| |
| /* void arch_switch_stacks_and_call(addr_t call, addr_t stack) */ |
| FUNCTION(arch_switch_stacks_and_call) |
| movl 4(%esp), %eax |
| movl 8(%esp), %edx |
| movl %edx, %esp |
| call *%eax /* perhaps this should be a jmp? it's not used anywhere so I don't know. */ |