98 lines
2.4 KiB
ArmAsm
98 lines
2.4 KiB
ArmAsm
/*
|
|
* 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. */
|