Small loader cleanups.

[pintos-anon] / src / threads / init.c

diff --git a/src/threads/init.c b/src/threads/init.c
index 54a98d256236eb54fa2ba1a515949285b10d8085..79cd3d0309bcb7823c3aa2ef7d48055782df1047 100644 (file)
--- a/src/threads/init.c
+++ b/src/threads/init.c
@@ -7,6 +7,7 @@
 #include "io.h"
 #include "kbd.h"
 #include "lib.h"
+#include "loader.h"
 #include "malloc.h"
 #include "mmu.h"
 #include "paging.h"
@@ -27,54 +28,52 @@ size_t kernel_pages;
 /* Amount of physical memory, in 4 kB pages. */
 size_t ram_pages;
 
+static void ram_init (void);
 static void gdt_init (void);
+static void argv_init (void);
 void power_off (void);
 
 static void
 main_thread (void *aux UNUSED) 
 {
+#ifdef FILESYS
   disk_init ();
-  thread_execute ("a.out");
+  filesys_init (true);
+  filesys_self_test ();
+#endif
 }
 
 int
 main (void)
 {
-  extern char _text, _end, __bss_start;
   struct thread *t;
 
-  /* Clear out the BSS segment. */
-  memset (&__bss_start, 0, &_end - &__bss_start);
-
+  /* Initialize components needed by printk() very early. */
+  ram_init ();
   vga_init ();
   serial_init ();
+  printk ("Booting cnachos86...\n");
 
   /* Calculate how much RAM the kernel uses, and find out from
      the bootloader how much RAM this machine has. */
-  kernel_pages = (&_end - &_text + 4095) / 4096;
-  ram_pages = *(uint32_t *) (0x7e00 - 6);
-
-  printk ("Initializing nachos-x86, %d kB RAM detected.\n",
-          ram_pages * 4);
+  printk ("ram: detected %'d kB main memory.\n", ram_pages * 4);
 
   /* Memory from the end of the kernel through the end of memory
      is free.  Give it to the page allocator. */
-  palloc_init ((void *) (KERN_BASE + kernel_pages * PGSIZE),
-               (void *) (PHYS_BASE + ram_pages * PGSIZE));
+  palloc_init (ptov (LOADER_KERN_BASE + kernel_pages * PGSIZE),
+               ptov (ram_pages * PGSIZE));
   paging_init ();
   gdt_init ();
 
   malloc_init ();
   random_init ();
 
+  argv_init ();
+
   intr_init ();
   timer_init ();
   kbd_init ();
 
-#ifdef FILESYS
-  filesys_init (false);
-#endif
-
   thread_init ();
 
   t = thread_create ("main", main_thread, NULL);
@@ -159,6 +158,33 @@ gdt_init (void)
   asm volatile ("lgdt %0" :: "m" (gdtr_operand));
   asm volatile ("ltr %w0" :: "r" (SEL_TSS));
 }
+
+static void
+ram_init (void) 
+{
+  /* Start and end of kernel image,
+     and start and end of BSS segment.
+     These are created by kernel.lds. */
+  extern char _start, _end;
+  extern char _start_bss, _end_bss;
+
+  /* The "BSS" is a segment that should be initialized to zeros.
+     It isn't actually stored on disk or zeroed by the kernel
+     loader, so we have to zero it ourselves. */
+  memset (&_start_bss, 0, &_end_bss - &_start_bss);
+
+  /* Calculate how much RAM the kernel uses,
+     and find out from the bootloader how much RAM this machine
+     has. */
+  kernel_pages = (&_end - &_start + 4095) / 4096;
+  ram_pages = *(uint32_t *) ptov (LOADER_BASE + LOADER_RAM_PAGES);
+}
+
+void
+argv_init (void) 
+{
+  char *cmd_line = ptov (LOADER_BASE + LOADER_CMD_LINE);
+}
 \f
 void
 power_off (void)