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- /*
- * 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. */
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