#include <stddef.h>
#include <limits.h>
#include "debug.h"
-#include "gdt.h"
#include "interrupt.h"
#include "io.h"
#include "kbd.h"
#include "thread.h"
#include "timer.h"
#include "vga.h"
+#ifdef USERPROG
+#include "exception.h"
+#include "syscall.h"
+#include "gdt.h"
+#include "tss.h"
+#endif
#ifdef FILESYS
#include "filesys.h"
#include "disk.h"
static void ram_init (void);
static void argv_init (void);
-static void
-main_thread (void *aux UNUSED)
-{
-#ifdef FILESYS
- disk_init ();
- filesys_init (format_filesys);
- fsutil_run ();
-#endif
-
-#ifdef USERPROG
- if (initial_program != NULL)
- thread_execute (initial_program);
- else
- PANIC ("no initial program specified");
-#endif
-}
+int main (void) NO_RETURN;
int
main (void)
{
- /* Initialize prerequisites for calling printk(). */
+ /* Needed by printk(), so initialize them very early. */
ram_init ();
vga_init ();
serial_init ();
/* Parse command line. */
argv_init ();
- /* Initialize memory system. */
+ /* Initialize memory system, segments, paging. */
+ thread_init ();
palloc_init ();
paging_init ();
+#ifdef USERPROG
+ tss_init ();
gdt_init ();
+#endif
malloc_init ();
+ /* Set random seed if not already done. */
random_init (0);
/* Initialize interrupt handlers. */
intr_init ();
timer_init ();
kbd_init ();
+#ifdef USERPROG
+ exception_init ();
+ syscall_init ();
+#endif
- /* Do everything else in a system thread. */
- thread_init ();
- thread_create ("main", main_thread, NULL);
+ /* Start thread scheduler and enable interrupts. */
thread_start ();
-}
+#ifdef FILESYS
+ /* Initialize filesystem. */
+ disk_init ();
+ filesys_init (format_filesys);
+ fsutil_run ();
+#endif
+
+ printk ("Boot complete.\n");
+#ifdef USERPROG
+ /* Run a user program. */
+ if (initial_program != NULL)
+ {
+ printk ("\nExecuting '%s':\n", initial_program);
+ thread_execute (initial_program);
+ }
+#endif
+
+ /* Terminate this thread. */
+ thread_exit ();
+}
+\f
+/* Clear BSS and obtain RAM size from loader. */
static void
ram_init (void)
{
extern char _start_bss, _end_bss;
memset (&_start_bss, 0, &_end_bss - &_start_bss);
- /* Get RAM size from loader. */
+ /* Get RAM size from loader. See loader.S. */
ram_pages = *(uint32_t *) ptov (LOADER_RAM_PAGES);
}
-\f
+
+/* Parses the command line. */
static void
argv_init (void)
{
" -p FILENAME Print the contents of FILENAME\n"
" -r FILENAME Delete FILENAME\n"
" -ls List the files in the filesystem\n"
- " -D Dump complete filesystem contents\n");
+ " -D Dump complete filesystem contents\n"
#endif
+ );
}
else
PANIC ("unknown option `%s'", argv[i]);