2b72262b4f
I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
85 lines
2.3 KiB
ArmAsm
85 lines
2.3 KiB
ArmAsm
/*
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* Copyright (c) 2012 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x64/kthread.S
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* Utilities and synchronization mechanisms for x64 kernel threads.
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*/
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.section .text
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.global kthread_mutex_trylock
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.type kthread_mutex_trylock, @function
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kthread_mutex_trylock:
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pushq %rbp
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movq %rsp, %rbp
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movl $-1, %eax
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xchgl (%rdi), %eax
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not %eax
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leaveq
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retq
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.size kthread_mutex_trylock, . - kthread_mutex_trylock
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.global kthread_mutex_lock
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.type kthread_mutex_lock, @function
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kthread_mutex_lock:
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pushq %rbp
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movq %rsp, %rbp
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kthread_mutex_lock_retry:
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movl $-1, %eax
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xchgl (%rdi), %eax
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testl %eax, %eax
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jnz kthread_mutex_lock_failed
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leaveq
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retq
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kthread_mutex_lock_failed:
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int $0x81 # Yield the CPU.
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jmp kthread_mutex_lock_retry
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.size kthread_mutex_lock, . - kthread_mutex_lock
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.global kthread_mutex_lock_signal
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.type kthread_mutex_lock_signal, @function
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kthread_mutex_lock_signal:
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pushq %rbp
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movq %rsp, %rbp
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kthread_mutex_lock_signal_retry:
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movq asm_signal_is_pending, %rax
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testq %rax, %rax
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jnz kthread_mutex_lock_signal_pending
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movl $-1, %eax
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xchgl (%rdi), %eax
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testl %eax, %eax
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jnz kthread_mutex_lock_signal_failed
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inc %eax
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kthread_mutex_lock_signal_out:
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leaveq
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retq
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kthread_mutex_lock_signal_failed:
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int $0x81 # Yield the CPU.
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jmp kthread_mutex_lock_signal_retry
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kthread_mutex_lock_signal_pending:
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xorl %eax, %eax
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jmp kthread_mutex_lock_signal_out
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.size kthread_mutex_lock_signal, . - kthread_mutex_lock_signal
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.global kthread_mutex_unlock
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.type kthread_mutex_unlock, @function
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kthread_mutex_unlock:
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pushq %rbp
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movq %rsp, %rbp
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movl $0, (%rdi)
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leaveq
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retq
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.size kthread_mutex_unlock, . - kthread_mutex_unlock
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