i386/ucla/src/lab1/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
  10 // Test the stack backtrace function (lab 1 only)
  11 void
  12 test_backtrace(int x)
  13 {
  14         cprintf("entering test_backtrace %d\n", x);
  15         if (x > 0)
  16                 test_backtrace(x-1);
  17         else
  18                 mon_backtrace(0, 0, 0);
  19         cprintf("leaving test_backtrace %d\n", x);
  20 }
  21
  22 asmlinkage void
  23 i386_init(void)
  24 {
  25         extern char edata[], end[];
  26         extern const uintptr_t sctors[], ectors[];
  27         const uintptr_t *ctorva;
  28
  29         // Initialize the console.
  30         // Can't call cprintf until after we do this!
  31         cons_init();
  32
  33         // Then call any global constructors (e.g., defined by C++).
  34         // This relies on linker script magic to define the 'sctors' and
  35         // 'ectors' symbols; see kern/kernel.ld.
  36         // Call after cons_init() so we can cprintf() if necessary.
  37         for (ctorva = ectors; ctorva > sctors; )
  38                 ((void(*)()) *--ctorva)();
  39
  40         cprintf("6828 decimal is %o octal!\n", 6828);
  41
  42
  43
  44
  45
  46
  47
  48         // Test the stack backtrace function (lab 1 only)
  49         test_backtrace(5);
  50
  51         // Drop into the kernel monitor.
  52         while (1)
  53                 monitor(NULL);
  54 }
  55
  56
  57 /*
  58  * Variable panicstr contains argument to first call to panic; used as flag
  59  * to indicate that the kernel has already called panic.
  60  */
  61 static const char *panicstr;
  62
  63 /*
  64  * Panic is called on unresolvable fatal errors.
  65  * It prints "panic: mesg", and then enters the kernel monitor.
  66  */
  67 void
  68 _panic(const char *file, int line, const char *fmt, ...)
  69 {
  70         va_list ap;
  71
  72         if (panicstr)
  73                 goto dead;
  74         panicstr = fmt;
  75
  76         // Be extra sure that the machine is in as reasonable state
  77         __asm __volatile("cli; cld");
  78
  79         va_start(ap, fmt);
  80         cprintf("kernel panic at %s:%d: ", file, line);
  81         vcprintf(fmt, ap);
  82         cprintf("\n");
  83         va_end(ap);
  84
  85 dead:
  86         /* break into the kernel monitor */
  87         while (1)
  88                 monitor(NULL);
  89 }
  90
  91 /* like panic, but don't */
  92 void
  93 _warn(const char *file, int line, const char *fmt, ...)
  94 {
  95         va_list ap;
  96
  97         va_start(ap, fmt);
  98         cprintf("kernel warning at %s:%d: ", file, line);
  99         vcprintf(fmt, ap);
 100         cprintf("\n");
 101         va_end(ap);
 102 }