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71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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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
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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syscall.h
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Handles system calls from userspace safely.
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******************************************************************************/
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#ifndef SORTIX_SYSCALL_H
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#define SORTIX_SYSCALL_H
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#include "syscallnum.h"
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namespace Sortix
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{
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class Thread;
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namespace Syscall
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{
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void Init();
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void Register(size_t index, void* funcptr);
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// Aborts the current system call such that the current thread is marked
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// as blocking, and control is transferred to the next runnable thread.
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// This allows the thread to wait for an condition that makes the thread
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// runnable again and stores the return value in the proper register.
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// Once called, you may safely return from the system call in good faith
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// that its return value shall be discarded.
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void Incomplete();
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// Call this prior to Incomplete() to signal that the scheduler should
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// go run something else for a moment. The current thread will not be
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// marked as blocking.
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void Yield();
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// For when you want the syscall exit code not to modify registers.
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void AsIs();
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// Retries a system call by making the thread runnable and then calling
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// the system call code whenever the thread is scheduled to run.
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void ScheduleResumption(Thread* thread);
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// Retries a system call based on the Thread::sc* values of the current
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// thread and if it succeeds, sets the proper registers.
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void Resume(CPU::InterruptRegisters* regs);
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CPU::InterruptRegisters* InterruptRegs();
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CPU::SyscallRegisters* SyscallRegs();
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}
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}
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extern "C" void syscall_handler();
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#endif
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