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/*
* file: mpx.h
*
* Header file for the MPX Operating System.
*
* This file contains constant, structure and function
* prototypes for the MPX Operating System
*/
/* MPX System request numbers. */
#define EXIT_CODE 0 /* Process requesting termination. code. */
#define CON 1 /* The console device - keyboard & monitor. */
#define PRT 2 /* The printer device - LPT1. */
#define COM 3 /* The serial port - COM1. */
/* MPX System request types. */
#define READ 0 /* Read from device. */
#define WRITE 1 /* Write to device. */
#define WAIT 2 /* Semaphore P operation for device. */
#define SIGNAL 3 /* Semaphore V operation for device. */
#define MAXSIZE 20 /* Size of the directory array. */
struct dirstruct { /* Data type for a directory entry. */
char dirnam[9]; /* The name of a .mpx file. */
int dirsiz; /* The size of the file (in bytes). */
};
typedef struct dirstruct dir; /* Use dir as the data typer name. */
/**
* PCB
*/
#define FREE 0
#define SYS_PROCESS 1
#define APP_PROCESS 2
#define READY 0
#define RUNNING 1
#define BLOCKED 2
#define NOT_SUSPENDED 0
#define SUSPENDED 1
struct pcbstruct {
struct pcbstruct * chain;
struct pcbstruct * next;
struct pcbstruct * prev;
char name[9];
short type;
short priority;
short state;
short suspend;
unsigned stack_ptr;
unsigned stack[400];
unsigned loadaddr;
int mem_size;
};
typedef struct pcbstruct pcb;
/* Function prototypes. */
/* main.c */
int main(void);
/* comhan.c */
void comhan(void); /* The MPX/OS command handler. */
int get_cmd(char args[]);
void cmd_version(void);
void cmd_date(char *[]);
void cmd_directory(void);
int cmd_stop(void);
void cmd_help(char *[]);
void cmd_prompt(char *[]);
void cmd_alias(char *[]);
void cmd_show(char *[]);
void cmd_allocate(char *[]);
void cmd_free(char *[]);
void sys_req(int,int,char *,int *); /* MPX system request function. */
int directory(dir *, int); /* Support function to load the */
/* directory array. */
/**
* PCB.C
*/
pcb * search_pcb(pcb *, char[]);
pcb * get_pcb(pcb *);
int free_pcb(pcb *, pcb *);
int build_pcb(pcb *, char[], int, int, int, int);
int insert_pcb(pcb**, pcb *, int);
int remove_pcb(pcb**, pcb *);
/*
* Global variable EXTERN directives.
*
* These extern declarations allow the variables to be
* accessed from any source code file which includes
* this header file. The memory space for the variables
* is declared in a *.c file.
*/
#define DIR_SIZE 20
extern dir direct[]; /* Array of directory entries - see direct.c */
extern int directory(dir *direct, int dir_size);
extern pcb * pcb_list;
extern pcb * ready_queue;
extern pcb * io_init_queue;
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