as of 2013-11-182013-11-18

1 files changed, 73 insertions, 10 deletions

diff --git a/mpx.h b/mpx.h
index 70e70a1..305e2a0 100644
--- a/mpx.h
+++ b/mpx.h
@@ -12,8 +12,7 @@
 #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.         
-#define */

+#define  COM  3       /* The serial port - COM1.                  */

 

 /* MPX System request types. */

 

@@ -63,6 +62,43 @@ struct pcbstruct {
 };

 typedef struct pcbstruct pcb;

 

+#define INPUT_BUFFER_MAX 40

+#define NO_OP 0

+#define READ_OP 1

+#define WRITE_OP 2

+

+#define MCR 0x3fc

+#define IER 0x3f9

+#define LCR 0x3fb

+#define RBR 0x3f8

+#define THR 0x3f8

+#define BRDR_LSB 0x3f8

+#define BRDR_MSB 0x3f9

+#define IIR 0x3fa

+

+#define IMR  0x21                   /* Port address of IMR     */

+#define CMR  0x43                   /* Command mode register   */

+#define IRQ0 0x01                   /* Mask for Timer          */

+#define CLOCK_ENABLE (0xff - IRQ0)  /* Mask to clear Timer bit */

+#define CLOCK_DISABLE (0x00 + 1)    /* Mask to set Timer bit   */

+

+/* Device Control Block */

+struct dcb_struct {

+  unsigned current_op;

+  unsigned * event_flag;

+  far int * length;

+  far char * buffer;

+  int count;

+  far char * c_buffer;

+  char ring[INPUT_BUFFER_MAX];

+  int ring_front;

+  int ring_rear;

+  int ring_count;

+  int ring_size;

+};

+

+typedef struct dcb_struct dcb;

+

 /* Function prototypes. */

 

 /* main.c */

@@ -89,6 +125,7 @@ void cmd_suspend(char *[]);
 void cmd_terminate(char *[]);

 void cmd_setpri(char *[]);

 void cmd_dispatch();

+void cmd_clock(char *[]);

 

 void sys_req(int,int,char *,int *);   /* MPX system request function. */

 int  directory(dir *, int);           /* Support function to load the */

@@ -107,27 +144,53 @@ int insert_pcb(pcb**, pcb *, int);
 int remove_pcb(pcb**, pcb *);

 

 /**

- * TestN.C

+ * DCB.c

  */

-void test1(void);

-void test2(void);

-void test3(void);

-void test4(void);

-void test5(void);

-

+void dcb_enqueue(dcb*, char);

+char dcb_dequeue(dcb*);

+void dcb_init(dcb*);

 /**

  * Sys_sppt.c

  */

 void sys_inti(void);

 void sys_exit(void);

+void clock_open(void);

+void clock_close(void);

+void stop_clock(void);

+void start_clock(void);

+int  set_clock(int, int, int);

+void read_clock(int*, int*, int*);

 void interrupt dispatch(void);

 void interrupt sys_call(void);

+void interrupt clock_int(void);

 

 /**

  * Load.c

  */

 int load(unsigned *,char []);

 

+/**

+ * Com.c

+ */

+int com_open(int *, int);

+void com_close(void);

+void interrupt com_int(void);

+int com_read(char far *, int far *);

+int com_write(char far *, int far *);

+int com_read_int();

+int com_write_int();

+

+/**

+ * Printer.c

+ */

+#define PCR 0x3be

+#define PDR 0x3bc

+

+int prt_open(int *);

+int prt_write(char far *, int *);

+int prt_close(void);

+void interrupt prt_int(void);

+

 /*

  *   Global variable EXTERN directives.

  *

@@ -137,7 +200,7 @@ int load(unsigned *,char []);
  *       is declared in a *.c file.

  */

 #define DIR_SIZE 20

-

+extern dcb com;

 extern dir direct[];  /* Array of directory entries -     see direct.c */

 extern int directory(dir *direct, int dir_size);

 extern pcb * pcb_list;