root / prex-0.9.0 / sys / kern / system.c @ 03e9c04a
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/*-
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* Copyright (c) 2005-2007, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* system.c - system services
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*/
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#include <kernel.h> |
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#include <thread.h> |
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#include <sched.h> |
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#include <task.h> |
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#include <vm.h> |
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#include <irq.h> |
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#include <page.h> |
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#include <device.h> |
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#include <system.h> |
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#include <hal.h> |
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#include <sys/dbgctl.h> |
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static char infobuf[MAXINFOSZ]; /* common information buffer */ |
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static const struct kerninfo kerninfo = { |
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"Prex", HOSTNAME, VERSION, __DATE__, MACHINE
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}; |
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/*
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* Get system information.
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*/
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int
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sysinfo(int type, void *buf) |
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{ |
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int error = 0; |
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sched_lock(); |
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switch (type) {
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case INFO_KERNEL:
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memcpy(buf, &kerninfo, sizeof(kerninfo));
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break;
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case INFO_MEMORY:
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page_info(buf); |
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break;
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case INFO_TIMER:
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timer_info(buf); |
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break;
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case INFO_THREAD:
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error = thread_info(buf); |
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break;
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case INFO_DEVICE:
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error = device_info(buf); |
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break;
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case INFO_TASK:
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error = task_info(buf); |
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break;
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case INFO_VM:
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error = vm_info(buf); |
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break;
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case INFO_IRQ:
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error = irq_info(buf); |
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break;
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default:
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error = EINVAL; |
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break;
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} |
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sched_unlock(); |
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return error;
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} |
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/*
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* System call to get system information.
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*/
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int
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sys_info(int type, void *buf) |
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{ |
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int error;
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size_t bufsz = 0;
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if (buf == NULL || !user_area(buf)) |
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return EFAULT;
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sched_lock(); |
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switch (type) {
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case INFO_KERNEL:
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bufsz = sizeof(struct kerninfo); |
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break;
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case INFO_MEMORY:
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bufsz = sizeof(struct meminfo); |
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break;
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case INFO_TIMER:
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bufsz = sizeof(struct timerinfo); |
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break;
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case INFO_THREAD:
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bufsz = sizeof(struct threadinfo); |
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break;
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case INFO_DEVICE:
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bufsz = sizeof(struct devinfo); |
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break;
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case INFO_TASK:
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bufsz = sizeof(struct taskinfo); |
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break;
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case INFO_VM:
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bufsz = sizeof(struct vminfo); |
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break;
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case INFO_IRQ:
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bufsz = sizeof(struct irqinfo); |
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break;
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default:
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sched_unlock(); |
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return EINVAL;
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} |
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error = copyin(buf, &infobuf, bufsz); |
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if (!error) {
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error = sysinfo(type, &infobuf); |
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if (!error) {
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error = copyout(&infobuf, buf, bufsz); |
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} |
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} |
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sched_unlock(); |
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return error;
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} |
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/*
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* Logging system call.
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*
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* Write a message to the logging device. The log
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* function is available only when kernel is built
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* with debug option.
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*/
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int
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sys_log(const char *str) |
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{ |
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#ifdef DEBUG
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char buf[DBGMSGSZ];
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if (copyinstr(str, buf, DBGMSGSZ))
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return EINVAL;
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printf("%s", buf);
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return 0; |
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#else
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return ENOSYS;
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#endif
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} |
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/*
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* Kernel debug service.
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*/
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int
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sys_debug(int cmd, void *data) |
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{ |
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#ifdef DEBUG
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int error = EINVAL;
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task_t task = 0;
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switch (cmd) {
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case DBGC_LOGSIZE:
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case DBGC_GETLOG:
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error = dbgctl(cmd, data); |
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break;
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case DBGC_TRACE:
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task = (task_t)data; |
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if (!task_valid(task)) {
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error = ESRCH; |
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break;
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} |
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dbgctl(cmd, (void *)task);
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error = 0;
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break;
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} |
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return error;
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#else
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return ENOSYS;
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#endif
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} |
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/*
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* Panic system call.
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*/
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int
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sys_panic(const char *str) |
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{ |
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#ifdef DEBUG
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char buf[DBGMSGSZ];
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sched_lock(); |
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copyinstr(str, buf, DBGMSGSZ - 20);
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printf("User panic: %s\n", str);
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printf(" task=%s thread=%lx\n", curtask->name, (long)curthread); |
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machine_abort(); |
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/* NOTREACHED */
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#else
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task_terminate(curtask); |
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#endif
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return 0; |
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} |
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/*
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* Get system time - return ticks since OS boot.
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*/
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int
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sys_time(u_long *ticks) |
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{ |
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u_long t; |
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t = timer_ticks(); |
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return copyout(&t, ticks, sizeof(t)); |
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} |
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/*
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* nonexistent system call.
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*/
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int
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sys_nosys(void)
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{ |
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return EINVAL;
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} |