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/* This file is part of test microkernel for OpenRISC 1000. */

/* (C) 2000 Damjan Lampret, lampret@opencores.org */

/* Length of the IPC message's useful data. */

#define MAX_MSGLEN 100

/* Number of user tasks in the system. */

#define MAX_TASKS 8

/* Number of IPC messages in the system. */

#define MAX_MSGS 16

/* Number of general purpose registers (not counting r0 and r1). */

#define GPRS 30

/* Size of kernel and user task stacks. Size for individual task. */

#define STACK_SIZE 2048 

/* Define this if you want kernel debug output. Note that you must

   assemble except_or32.S with KERNEL_OUTPUT defined in Makefile. This

   definition is only for main uos.c. */

#define KERNEL_OUTPUT 0

/* Define this if you want task switch at every system call. */

#define KERNEL_SYSCALL_SCHED 0

/* System tick timer period */

#define TICK_PERIOD 0x500

/* Task ID type (if we would have processes then we would call it PID) */

typedef int tid_t;

/* System call numbers */

#define IPC_MSGSND 1

#define IPC_MSGRCV 2

/* Message Control Block structure */

struct mcb {

        char msg[MAX_MSGLEN];           /* Message's data */

        int length;                     /* Message's length */

        tid_t origin;                   /* TID of message's origin task */

        struct mcb *next;               /* Next message in linked list */

};

/* Task Control Block structure */

struct tcb {

        struct regs {

                unsigned long pc;               /* Task's PC */

                unsigned long sp;               /* Task's stack (r1)*/

                unsigned long gprs[GPRS];       /* Task's GPRs r2-r15 */

                unsigned long sr;               /* Task's supervision register */

        } regs;

        struct mcb *waiting_msgs;       /* Waiting messages */

};

extern void dispatch();

/* Called by kernel_init to collect all tasks entries. */

extern void tasks_entries();