mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
89 lines
2.4 KiB
ArmAsm
89 lines
2.4 KiB
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/>.
|
|
|
|
x64/kthread.S
|
|
Utilities and synchronization mechanisms for x64 kernel threads.
|
|
|
|
*******************************************************************************/
|
|
|
|
.section .text
|
|
|
|
.global kthread_mutex_trylock
|
|
.type kthread_mutex_trylock, @function
|
|
kthread_mutex_trylock:
|
|
pushq %rbp
|
|
movq %rsp, %rbp
|
|
movl $-1, %eax
|
|
xchgl (%rdi), %eax
|
|
not %eax
|
|
leaveq
|
|
retq
|
|
.size kthread_mutex_trylock, . - kthread_mutex_trylock
|
|
|
|
.global kthread_mutex_lock
|
|
.type kthread_mutex_lock, @function
|
|
kthread_mutex_lock:
|
|
pushq %rbp
|
|
movq %rsp, %rbp
|
|
kthread_mutex_lock_retry:
|
|
movl $-1, %eax
|
|
xchgl (%rdi), %eax
|
|
testl %eax, %eax
|
|
jnz kthread_mutex_lock_failed
|
|
leaveq
|
|
retq
|
|
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:
|
|
pushq %rbp
|
|
movq %rsp, %rbp
|
|
kthread_mutex_lock_signal_retry:
|
|
movq asm_signal_is_pending, %rax
|
|
testq %rax, %rax
|
|
jnz kthread_mutex_lock_signal_pending
|
|
movl $-1, %eax
|
|
xchgl (%rdi), %eax
|
|
testl %eax, %eax
|
|
jnz kthread_mutex_lock_signal_failed
|
|
inc %eax
|
|
kthread_mutex_lock_signal_out:
|
|
leaveq
|
|
retq
|
|
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
|
|
.size kthread_mutex_lock_signal, . - kthread_mutex_lock_signal
|
|
|
|
.global kthread_mutex_unlock
|
|
.type kthread_mutex_unlock, @function
|
|
kthread_mutex_unlock:
|
|
pushq %rbp
|
|
movq %rsp, %rbp
|
|
movl $0, (%rdi)
|
|
leaveq
|
|
retq
|
|
.size kthread_mutex_unlock, . - kthread_mutex_unlock
|