jos/kern/init.c
2019-03-31 23:09:16 -07:00

93 lines
1.8 KiB
C

/* See COPYRIGHT for copyright information. */
#include <inc/stdio.h>
#include <inc/string.h>
#include <inc/assert.h>
#include <kern/monitor.h>
#include <kern/console.h>
// Test the stack backtrace function (lab 1 only)
void
test_backtrace(int x)
{
cprintf("entering test_backtrace %d\n", x);
if (x > 0)
test_backtrace(x-1);
else
mon_backtrace(0, 0, 0);
cprintf("leaving test_backtrace %d\n", x);
}
void
i386_init(void)
{
extern char edata[], end[];
// Before doing anything else, complete the ELF loading process.
// Clear the uninitialized global data (BSS) section of our program.
// This ensures that all static/global variables start out zero.
memset(edata, 0, end - edata);
// Initialize the console.
// Can't call cprintf until after we do this!
cons_init();
cprintf("444544 decimal is %o octal!\n", 444544);
// Test the stack backtrace function (lab 1 only)
test_backtrace(5);
// Drop into the kernel monitor.
while (1)
monitor(NULL);
}
/*
* Variable panicstr contains argument to first call to panic; used as flag
* to indicate that the kernel has already called panic.
*/
const char *panicstr;
/*
* Panic is called on unresolvable fatal errors.
* It prints "panic: mesg", and then enters the kernel monitor.
*/
void
_panic(const char *file, int line, const char *fmt,...)
{
va_list ap;
if (panicstr)
goto dead;
panicstr = fmt;
// Be extra sure that the machine is in as reasonable state
asm volatile("cli; cld");
va_start(ap, fmt);
cprintf("kernel panic at %s:%d: ", file, line);
vcprintf(fmt, ap);
cprintf("\n");
va_end(ap);
dead:
/* break into the kernel monitor */
while (1)
monitor(NULL);
}
/* like panic, but don't */
void
_warn(const char *file, int line, const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
cprintf("kernel warning at %s:%d: ", file, line);
vcprintf(fmt, ap);
cprintf("\n");
va_end(ap);
}