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/* uos.h. Microkernel header for Or1ksim
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Copyright (C) 2000 Damjan Lampret
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Copyright (C) 2010 Embecosm Limited
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Contributor Damjan Lampret <lampret@opencores.org>
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http: www.gnu.org/licenses/>. */
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/* ----------------------------------------------------------------------------
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This code is commented throughout for use with Doxygen.
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--------------------------------------------------------------------------*/
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/* This file is part of test microkernel for OpenRISC 1000. */
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/* Length of the IPC message's useful data. */
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#define MAX_MSGLEN 100
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/* Number of user tasks in the system. */
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#define MAX_TASKS 8
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/* Number of IPC messages in the system. */
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#define MAX_MSGS 16
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/* Number of general purpose registers (not counting r0 and r1). */
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#define GPRS 30
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/* Size of kernel and user task stacks. Size for individual task. */
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#define STACK_SIZE 2048
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/* Define this if you want kernel debug output. Note that you must
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assemble except_or32.S with KERNEL_OUTPUT defined in Makefile. This
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definition is only for main uos.c. */
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#define KERNEL_OUTPUT 0
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/* Define this if you want task switch at every system call. */
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#define KERNEL_SYSCALL_SCHED 0
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/* System tick timer period */
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#define TICK_PERIOD 0x500
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/* Task ID type (if we would have processes then we would call it PID) */
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typedef int tid_t;
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/* System call numbers */
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#define IPC_MSGSND 1
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#define IPC_MSGRCV 2
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/* Message Control Block structure */
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struct mcb {
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char msg[MAX_MSGLEN]; /* Message's data */
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int length; /* Message's length */
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tid_t origin; /* TID of message's origin task */
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struct mcb *next; /* Next message in linked list */
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};
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/* Task Control Block structure */
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struct tcb {
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struct regs {
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unsigned long pc; /* Task's PC */
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unsigned long sp; /* Task's stack (r1)*/
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unsigned long gprs[GPRS]; /* Task's GPRs r2-r15 */
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unsigned long sr; /* Task's supervision register */
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} regs;
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struct mcb *waiting_msgs; /* Waiting messages */
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};
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extern void dispatch();
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/* Called by kernel_init to collect all tasks entries. */
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extern void tasks_entries();
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