blob: 9a97948afe440d71ec3be3c96adc22a77651b67c [file] [log] [blame]
/*
* 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. */