Initial Spring 2016 commit.
This commit is contained in:
Geoffrey Challen
216
kern/main/main.c
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216
kern/main/main.c
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/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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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 University nor the names of its 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 UNIVERSITY 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 UNIVERSITY 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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* Main.
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*/
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#include <types.h>
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#include <kern/errno.h>
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#include <kern/reboot.h>
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#include <kern/unistd.h>
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#include <lib.h>
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#include <spl.h>
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#include <clock.h>
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#include <thread.h>
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#include <proc.h>
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#include <current.h>
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#include <synch.h>
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#include <vm.h>
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#include <mainbus.h>
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#include <vfs.h>
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#include <device.h>
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#include <syscall.h>
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#include <test.h>
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#include <version.h>
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#include "autoconf.h" // for pseudoconfig
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/*
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* These two pieces of data are maintained by the makefiles and build system.
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* buildconfig is the name of the config file the kernel was configured with.
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* buildversion starts at 1 and is incremented every time you link a kernel.
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*
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* The purpose is not to show off how many kernels you've linked, but
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* to make it easy to make sure that the kernel you just booted is the
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* same one you just built.
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*/
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extern const int buildversion;
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extern const char buildconfig[];
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/*
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* Copyright message for the OS/161 base code.
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*/
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static const char harvard_copyright[] =
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"Copyright (c) 2000, 2001-2005, 2008-2011, 2013, 2014\n"
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" President and Fellows of Harvard College. All rights reserved.\n";
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/*
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* Initial boot sequence.
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*/
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static
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void
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boot(void)
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{
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/*
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* The order of these is important!
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* Don't go changing it without thinking about the consequences.
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*
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* Among other things, be aware that console output gets
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* buffered up at first and does not actually appear until
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* mainbus_bootstrap() attaches the console device. This can
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* be remarkably confusing if a bug occurs at this point. So
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* don't put new code before mainbus_bootstrap if you don't
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* absolutely have to.
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*
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* Also note that the buffer for this is only 1k. If you
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* overflow it, the system will crash without printing
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* anything at all. You can make it larger though (it's in
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* dev/generic/console.c).
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*/
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kprintf("\n");
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kprintf("OS/161 base system version %s\n", BASE_VERSION);
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kprintf("%s", harvard_copyright);
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kprintf("\n");
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kprintf("Put-your-group-name-here's system version %s (%s #%d)\n",
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GROUP_VERSION, buildconfig, buildversion);
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kprintf("\n");
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/* Early initialization. */
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ram_bootstrap();
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proc_bootstrap();
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thread_bootstrap();
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hardclock_bootstrap();
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vfs_bootstrap();
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kheap_nextgeneration();
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/* Probe and initialize devices. Interrupts should come on. */
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kprintf("Device probe...\n");
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KASSERT(curthread->t_curspl > 0);
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mainbus_bootstrap();
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KASSERT(curthread->t_curspl == 0);
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/* Now do pseudo-devices. */
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pseudoconfig();
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kprintf("\n");
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kheap_nextgeneration();
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/* Late phase of initialization. */
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vm_bootstrap();
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kprintf_bootstrap();
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thread_start_cpus();
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/* Default bootfs - but ignore failure, in case emu0 doesn't exist */
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vfs_setbootfs("emu0");
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kheap_nextgeneration();
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/*
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* Make sure various things aren't screwed up.
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*/
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COMPILE_ASSERT(sizeof(userptr_t) == sizeof(char *));
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COMPILE_ASSERT(sizeof(*(userptr_t)0) == sizeof(char));
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}
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/*
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* Shutdown sequence. Opposite to boot().
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*/
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static
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void
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shutdown(void)
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{
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kprintf("Shutting down.\n");
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vfs_clearbootfs();
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vfs_clearcurdir();
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vfs_unmountall();
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thread_shutdown();
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splhigh();
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}
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/*****************************************/
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/*
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* reboot() system call.
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*
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* Note: this is here because it's directly related to the code above,
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* not because this is where system call code should go. Other syscall
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* code should probably live in the "syscall" directory.
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*/
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int
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sys_reboot(int code)
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{
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switch (code) {
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case RB_REBOOT:
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case RB_HALT:
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case RB_POWEROFF:
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break;
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default:
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return EINVAL;
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}
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shutdown();
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switch (code) {
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case RB_HALT:
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kprintf("The system is halted.\n");
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mainbus_halt();
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break;
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case RB_REBOOT:
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kprintf("Rebooting...\n");
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mainbus_reboot();
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break;
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case RB_POWEROFF:
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kprintf("The system is halted.\n");
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mainbus_poweroff();
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break;
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}
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panic("reboot operation failed\n");
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return 0;
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}
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/*
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* Kernel main. Boot up, then fork the menu thread; wait for a reboot
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* request, and then shut down.
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*/
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void
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kmain(char *arguments)
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{
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boot();
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menu(arguments);
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/* Should not get here */
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}
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