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sortix--sortix/kernel/x86/kthread.S
2014-03-01 14:37:40 +01:00

109 lines
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ArmAsm

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
x86/kthread.S
Utilities and synchronization mechanisms for x86 kernel threads.
*******************************************************************************/
.section .text
.global kthread_mutex_trylock
.type kthread_mutex_trylock, @function
kthread_mutex_trylock:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
movl $-1, %eax
xchgl (%edx), %eax
not %eax
leavel
retl
.size kthread_mutex_trylock, . - kthread_mutex_trylock
.global kthread_mutex_lock
.type kthread_mutex_lock, @function
kthread_mutex_lock:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
kthread_mutex_lock_retry:
movl $-1, %eax
xchgl (%edx), %eax
testl %eax, %eax
jnz kthread_mutex_lock_failed
leavel
retl
kthread_mutex_lock_failed:
int $0x81 # Yield the CPU.
jmp kthread_mutex_lock_retry
.size kthread_mutex_lock, . - kthread_mutex_lock
.global kthread_mutex_lock_signal
.type kthread_mutex_lock_signal, @function
kthread_mutex_lock_signal:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
kthread_mutex_lock_signal_retry:
movl asm_signal_is_pending, %eax
testl %eax, %eax
jnz kthread_mutex_lock_signal_pending
movl $-1, %eax
xchgl (%edx), %eax
testl %eax, %eax
jnz kthread_mutex_lock_signal_failed
inc %eax
kthread_mutex_lock_signal_out:
leavel
retl
kthread_mutex_lock_signal_failed:
int $0x81 # Yield the CPU.
jmp kthread_mutex_lock_signal_retry
kthread_mutex_lock_signal_pending:
xorl %eax, %eax
jmp kthread_mutex_lock_signal_out
.global kthread_mutex_unlock
.type kthread_mutex_unlock, @function
kthread_mutex_unlock:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
movl $0, (%edx)
leavel
retl
.size kthread_mutex_lock_signal, . - kthread_mutex_lock_signal
.global asm_call_BootstrapKernelThread
.type asm_call_BootstrapKernelThread, @function
asm_call_BootstrapKernelThread:
pushl %esi
pushl %edi
call BootstrapKernelThread
# BootstrapKernelThread is noreturn, no need for code here.
.size asm_call_BootstrapKernelThread, . - asm_call_BootstrapKernelThread
.global asm_call_Thread__OnSigKill
.type asm_call_Thread__OnSigKill, @function
asm_call_Thread__OnSigKill:
pushl %edi
call Thread__OnSigKill
# Thread__OnSigKill is noreturn, no need for code here.
.size asm_call_Thread__OnSigKill, . - asm_call_Thread__OnSigKill