kern/init.c

   1 /* See COPYRIGHT for copyright information. */
   2
   3 #include <inc/stdio.h>
   4 #include <inc/string.h>
   5 #include <inc/assert.h>
   6
   7 #include <kern/monitor.h>
   8 #include <kern/console.h>
   9 #include <kern/pmap.h>
  10 #include <kern/kclock.h>
  11 #include <kern/env.h>
  12 #include <kern/trap.h>
  13
  14 void
  15 i386_init(void)
  16 {
  17         extern char edata[], end[];
  18
  19         // Before doing anything else, complete the ELF loading process.
  20         // Clear the uninitialized global data (BSS) section of our program.
  21         // This ensures that all static/global variables start out zero.
  22         memset(edata, 0, end - edata);
  23
  24         // Initialize the console.
  25         // Can't call cprintf until after we do this!
  26         cons_init();
  27
  28         cprintf("6828 decimal is %o octal!\n", 6828);
  29
  30         // Lab 2 memory management initialization functions
  31         i386_detect_memory();
  32         i386_vm_init();
  33
  34         // Lab 3 user environment initialization functions
  35         env_init();
  36         idt_init();
  37
  38         // Temporary test code specific to LAB 3
  39 #if defined(TEST)
  40         // Don't touch -- used by grading script!
  41         ENV_CREATE2(TEST, TESTSIZE);
  42 #else
  43         // Touch all you want.
  44         ENV_CREATE(user_hello);
  45 #endif // TEST*
  46
  47         // We only have one user environment for now, so just run it.
  48         env_run(&envs[0]);
  49 }
  50
  51
  52 /*
  53  * Variable panicstr contains argument to first call to panic; used as flag
  54  * to indicate that the kernel has already called panic.
  55  */
  56 static const char *panicstr;
  57
  58 /*
  59  * Panic is called on unresolvable fatal errors.
  60  * It prints "panic: mesg", and then enters the kernel monitor.
  61  */
  62 void
  63 _panic(const char *file, int line, const char *fmt,...)
  64 {
  65         va_list ap;
  66
  67         if (panicstr)
  68                 goto dead;
  69         panicstr = fmt;
  70
  71         va_start(ap, fmt);
  72         cprintf("kernel panic at %s:%d: ", file, line);
  73         vcprintf(fmt, ap);
  74         cprintf("\n");
  75         va_end(ap);
  76
  77 dead:
  78         /* break into the kernel monitor */
  79         while (1)
  80                 monitor(NULL);
  81 }
  82
  83 /* like panic, but don't */
  84 void
  85 _warn(const char *file, int line, const char *fmt,...)
  86 {
  87         va_list ap;
  88
  89         va_start(ap, fmt);
  90         cprintf("kernel warning at %s:%d: ", file, line);
  91         vcprintf(fmt, ap);
  92         cprintf("\n");
  93         va_end(ap);
  94 }