console.h

一个用在mips体系结构中的操作系统

/*
 * Copyright (C) 1996-1998 by the Board of Trustees
 *    of Leland Stanford Junior University.
 * 
 * This file is part of the SimOS distribution. 
 * See LICENSE file for terms of the license. 
 *
 */

/*****************************************************************
 * sim_console.h
 *
 * Very simple console device emulation.
 * Dan Teodosiu, 07/96
 *
 ****************************************************************/

#ifndef _SIM_CONSOLE_H
#define _SIM_CONSOLE_H
#include "checkpoint.h"

#define MAX_CONSOLES 32

extern int ConsolePort;         /* console socket no. for slave consoles */
extern int SlaveConsoleTimeOut; /* slave console timeout */


/*** SimOS interface ***/

/* Initialize n consoles. When a console wishes to post/clear an interrupt,
 * it will call the int_f (if any provided). The argument to the function
 * is 1 if an interrupt is raised, 0 otherwise.
 */
extern void sim_console_init(int n, void (*int_f)(int n, int on));

/* Poll all console inputs. Should be called periodically.
 */
extern void sim_console_poll(void);

/* Signal a character is available. This function is used by expect to
 * tell the console (or actually, the OS) it has a character ready for it.
 */
extern void sim_console_has_char(int n);

/* Console state checkpointing. Called from startup.c.
 * version refers to checkpoint version number
 */
extern void sim_console_ckpt(CptDescriptor *cptd);


/*** OS interface ***/

/* Output a character to the console. This never fails, as this device
 * doesn't model finite buffering capacity.
 */
extern void sim_console_out(int n, char c);
/* Outputs a character to the console, without raising any interrupts
 * - used by the Alpha firmware (not by the OS itself)
 */
extern void sim_console_simpleIO(int n, char c);
/* Uses sim_console_out to perform functionality similar to 'write'
 */
extern void sim_console_write(int console, char *buf, unsigned int nbytes);

/* Input a character from the console. Returns the character (if any)
 * or -1 if there is no character pending on this console. If no further
 * characters are pending, the (input) interrupt is cleared.
 */
extern int  sim_console_in(int n);

#define CONS_INT_TX   0x01  /* interrupt enable / state bits */
#define CONS_INT_RX   0x02

/* Read the current interrupt status of this console.
 * NOTE: calling this routine has the side effect of clearing any pending
 * TX interrupt. 
 * The _noSE version does not have this side-effect
 */
extern int  sim_console_int_status(int n);
extern int  sim_console_int_status_noSE(int n);

/* Set the interrupt enable bits.
 */
extern void sim_console_int_set(int n, int bits);


#endif /* _SIMPROM_H */