288 lines
8.4 KiB
C
288 lines
8.4 KiB
C
/*! \file syscall.h
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\brief Nachos system call interface.
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These are Nachos kernel operations
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that can be invoked from user programs, by trapping to the kernel
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via the "syscall" instruction.
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This file is included by user programs and by the Nachos kernel.
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Each of these is invoked by a user program by simply calling the
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procedure; an assembly language stub stuffs the system call code
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into a register, and traps to the kernel. The kernel procedures
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are then invoked in the Nachos kernel, after appropriate error checking,
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from the system call entry point in exception.cc.
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* -----------------------------------------------------
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* This file is part of the Nachos-RiscV distribution
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* Copyright (c) 2022 University of Rennes 1.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details
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* (see see <http://www.gnu.org/licenses/>).
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* -----------------------------------------------------
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*/
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#ifndef SYSCALLS_H
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#define SYSCALLS_H
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//#include "kernel/copyright.h"
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/* system call codes -- used by the stubs to tell the kernel which system call
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* is being asked for
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*/
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#define SC_HALT 0
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#define SC_EXIT 1
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#define SC_EXEC 2
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#define SC_JOIN 3
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#define SC_CREATE 4
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#define SC_OPEN 5
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#define SC_READ 6
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#define SC_WRITE 7
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#define SC_SEEK 8
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#define SC_CLOSE 9
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#define SC_NEW_THREAD 10
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#define SC_YIELD 11
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#define SC_PERROR 12
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#define SC_P 13
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#define SC_V 14
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#define SC_SEM_CREATE 15
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#define SC_SEM_DESTROY 16
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#define SC_LOCK_CREATE 17
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#define SC_LOCK_DESTROY 18
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#define SC_LOCK_ACQUIRE 19
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#define SC_LOCK_RELEASE 20
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#define SC_COND_CREATE 21
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#define SC_COND_DESTROY 22
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#define SC_COND_WAIT 23
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#define SC_COND_SIGNAL 24
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#define SC_COND_BROADCAST 25
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#define SC_TTY_SEND 26
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#define SC_TTY_RECEIVE 27
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#define SC_MKDIR 28
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#define SC_RMDIR 29
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#define SC_REMOVE 30
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#define SC_FSLIST 31
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#define SC_SYS_TIME 32
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#define SC_MMAP 33
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#define SC_DEBUG 34
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#ifndef IN_ASM
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/* The system call interface. These are the operations the Nachos
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* kernel needs to support, to be able to run user programs.
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*
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*/
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typedef int t_error;
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/* Stop Nachos, and print out performance stats */
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void Halt();
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/* Return the time spent running Nachos */
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/*! \brief Defines the Nachos basic time unit */
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typedef struct {
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long seconds;
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long nanos;
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} Nachos_Time;
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void SysTime(Nachos_Time *t);
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/* Address space control operations: Exit, Exec, and Join */
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/* This user program is done (status = 0 means exited normally). */
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void Exit(int status);
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/* A unique identifier for a thread executed within a user program */
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typedef unsigned long ThreadId;
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/* Run the executable, stored in the Nachos file "name", and return the
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* master thread identifier
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*/
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ThreadId Exec(char *name);
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/* Create a new thread in the current process
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* Return thread identifier
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*/
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ThreadId newThread(char * debug_name, int func, int arg);
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/* Only return once the the thread "id" has finished.
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*/
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t_error Join(ThreadId id);
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/* Yield the CPU to another runnable thread, whether in this address space
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* or not.
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*/
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void Yield();
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/*! Print the last error message with the personalized one "mess" */
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void PError(char *mess);
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/* File system operations: Create, Open, Read, Write, Seek, Close
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* These functions are patterned after UNIX -- files represent
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* both files *and* hardware I/O devices.
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*
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* If this assignment is done before doing the file system assignment,
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* note that the Nachos file system has a stub implementation, which
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* will work for the purposes of testing out these routines.
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*/
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/* A unique identifier for an open Nachos file. */
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typedef unsigned long OpenFileId;
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/* when an address space starts up, it has two open files, representing
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* keyboard input and display output (in UNIX terms, stdin and stdout).
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* Read and Write can be used directly on these, without first opening
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* the console device.
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*/
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#define CONSOLE_INPUT 0
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#define CONSOLE_OUTPUT 1
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/* Create a Nachos file, with "name" */
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t_error Create(char *name,int size);
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/* Open the Nachos file "name", and return an "OpenFileId" that can
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* be used to read and write to the file.
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*/
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OpenFileId Open(char *name);
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/* Write "size" bytes from "buffer" to the open file. */
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t_error Write(char *buffer, int size, OpenFileId id);
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/* Read "size" bytes from the open file into "buffer".
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* Return the number of bytes actually read -- if the open file isn't
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* long enough, or if it is an I/O device, and there aren't enough
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* characters to read, return whatever is available (for I/O devices,
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* you should always wait until you can return at least one character).
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*/
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t_error Read(char *buffer, int size, OpenFileId id);
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/* Seek to a specified offset into an opened file */
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t_error Seek(int offset, OpenFileId id);
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#ifndef SYSDEP_H
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/* Close the file, we're done reading and writing to it. */
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t_error Close(OpenFileId id);
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#endif // SYSDEP_H
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/* Remove the file */
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t_error Remove(char* name);
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/******************************************************************/
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/* system calls concerning directory management */
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/* Create a new repertory
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Return a negative number if an error ocurred.
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*/
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t_error Mkdir(char* name);
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/* Destroy a repertory, which must be empty.
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Return a negative number if an error ocurred.
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*/
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t_error Rmdir(char* name);
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/* List the content of NachOS FileSystem */
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t_error FSList();
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/******************************************************************/
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/* User-level synchronization operations : */
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/* System calls concerning semaphores management */
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typedef unsigned long SemId;
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/* Create a semaphore, initialising it at count.
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Return a Semid, which will enable to do operations on this
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semaphore */
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SemId SemCreate(char * debug_name, int count);
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/* Destroy a semaphore identified by sema.
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Return a negative number if an error occured during the destruction */
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t_error SemDestroy(SemId sema);
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/* Do the operation P() on the semaphore sema */
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t_error P(SemId sema);
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/* Do the operation V() on the semaphore sema */
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t_error V(SemId sema);
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/* System calls concerning locks management */
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typedef unsigned long LockId;
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/* Create a lock.
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Return an identifier */
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LockId LockCreate(char * debug_name);
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/* Destroy a lock.
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Return a negative number if an error ocurred
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during the destruction. */
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t_error LockDestroy(LockId id);
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/* Do the operation Acquire on the lock id.
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Return a negative number if an error ocurred. */
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t_error LockAcquire(LockId id);
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/* Do the operation Release on the lock id.
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Return a negative number if an error ocurred.
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*/
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t_error LockRelease(LockId id);
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/* System calls concerning conditions variables. */
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typedef unsigned long CondId;
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/* Create a new condition variable */
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CondId CondCreate(char * debug_name);
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/* Destroy a condition variable.
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Return a negative number if an error ocurred.
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*/
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t_error CondDestroy(CondId id);
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/* Do the operation Wait on a condition variable.
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Returns a negative number if an error ocurred.
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*/
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t_error CondWait(CondId cond);
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/* Do the operation Signal on a condition variable (wake up only one thread).
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Return a negative number if an error ocurred.
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*/
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t_error CondSignal(CondId cond);
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/* Do the operation Signal on a condition variable (wake up all threads).
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Return a negative number if an error ocurred.
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*/
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t_error CondBroadcast(CondId cond);
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/******************************************************************/
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/* System calls concerning serial port and console */
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/* Send the message on the serial communication link.
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Returns the number of bytes successfully sent.
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*/
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int TtySend(char *mess);
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/* Wait for a message comming from the serial communication link.
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The length of the buffer where the bytes will be copied is given as a parameter.
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Returns the number of characters actually received.
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*/
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int TtyReceive(char *mess,int length);
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/* Map an opened file in memory. Size is the size to be mapped in bytes.
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*/
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void *Mmap(OpenFileId f, int size);
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/* For debug purpose
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*/
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void Debug(int param);
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#endif // IN_ASM
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#endif // SYSCALL_H
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