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