109 lines
2.3 KiB
C
109 lines
2.3 KiB
C
/* See COPYRIGHT for copyright information. */
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#include <inc/stdio.h>
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#include <inc/string.h>
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#include <inc/assert.h>
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#include <inc/x86.h>
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#include <kern/monitor.h>
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#include <kern/console.h>
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#include <kern/pmap.h>
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#include <kern/kclock.h>
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#include <kern/env.h>
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#include <kern/trap.h>
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void sysenter_handler();
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void
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i386_init(void)
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{
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extern char edata[], end[];
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// Before doing anything else, complete the ELF loading process.
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// Clear the uninitialized global data (BSS) section of our program.
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// This ensures that all static/global variables start out zero.
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memset(edata, 0, end - edata);
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// Initialize the console.
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// Can't call cprintf until after we do this!
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cons_init();
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cprintf("444544 decimal is %o octal!\n", 444544);
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cprintf("\33[31m" "C"
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"\33[33m" "o"
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"\33[32m" "l"
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"\33[36m" "o"
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"\33[34m" "r"
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"\33[0m" " Works!" "\n");
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write_msr(MSR_IA32_SYSENTER_EIP, (uint32_t) sysenter_handler, 0);
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write_msr(MSR_IA32_SYSENTER_ESP, KSTACKTOP, 0);
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write_msr(MSR_IA32_SYSENTER_CS, GD_KT, 0);
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// Lab 2 memory management initialization functions
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mem_init();
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// Lab 3 user environment initialization functions
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env_init();
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trap_init();
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#if defined(TEST)
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// Don't touch -- used by grading script!
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ENV_CREATE(TEST, ENV_TYPE_USER);
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#else
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// Touch all you want.
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ENV_CREATE(user_hello, ENV_TYPE_USER);
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#endif // TEST*
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// We only have one user environment for now, so just run it.
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env_run(&envs[0]);
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}
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/*
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* Variable panicstr contains argument to first call to panic; used as flag
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* to indicate that the kernel has already called panic.
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*/
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const char *panicstr;
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/*
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* Panic is called on unresolvable fatal errors.
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* It prints "panic: mesg", and then enters the kernel monitor.
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*/
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void
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_panic(const char *file, int line, const char *fmt,...)
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{
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va_list ap;
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if (panicstr)
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goto dead;
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panicstr = fmt;
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// Be extra sure that the machine is in as reasonable state
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asm volatile("cli; cld");
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va_start(ap, fmt);
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cprintf("kernel panic at %s:%d: ", file, line);
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vcprintf(fmt, ap);
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cprintf("\n");
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va_end(ap);
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dead:
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/* break into the kernel monitor */
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while (1)
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monitor(NULL);
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}
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/* like panic, but don't */
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void
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_warn(const char *file, int line, const char *fmt,...)
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{
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va_list ap;
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va_start(ap, fmt);
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cprintf("kernel warning at %s:%d: ", file, line);
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vcprintf(fmt, ap);
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cprintf("\n");
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va_end(ap);
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}
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