#include "io.h"
#include "kbd.h"
#include "lib.h"
+#include "loader.h"
#include "malloc.h"
#include "mmu.h"
#include "paging.h"
#include "disk.h"
#endif
-/* Size of kernel static code and data, in 4 kB pages. */
-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)
{
- struct disk *hda;
+#ifdef FILESYS
disk_init ();
- hda = disk_get (1);
- if (hda != NULL)
- {
- char buf[DISK_SECTOR_SIZE];
- disk_read (hda, 0, buf);
- //hex_dump (buf, sizeof buf);
- }
- else
- printk ("no hda\n");
- 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. */
+ /* Initialize prerequisites for calling printk(). */
+ 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 ("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));
+
+ /* Greet user. */
+ printk ("Booting cnachos86 with %'d kB RAM...\n", ram_pages * 4);
+
+ /* Initialize memory system. */
+ palloc_init ();
paging_init ();
gdt_init ();
-
malloc_init ();
+
random_init ();
+ argv_init ();
+ /* Initialize interrupt handlers. */
intr_init ();
timer_init ();
kbd_init ();
-#ifdef FILESYS
- filesys_init (false);
-#endif
-
+ /* Do everything else in a system thread. */
thread_init ();
-
- t = thread_create ("main", main_thread, NULL);
- thread_start (t);
-
- printk ("Done!\n");
- return 0;
+ thread_start (thread_create ("main", main_thread, NULL));
}
static uint64_t
asm volatile ("lgdt %0" :: "m" (gdtr_operand));
asm volatile ("ltr %w0" :: "r" (SEL_TSS));
}
+
+static void
+ram_init (void)
+{
+ /* 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.
+
+ The start and end of the BSS segment is recorded by the
+ linker as _start_bss and _end_bss. See kernel.lds. */
+ extern char _start_bss, _end_bss;
+ memset (&_start_bss, 0, &_end_bss - &_start_bss);
+
+ /* Get RAM size from loader. */
+ ram_pages = *(uint32_t *) ptov (LOADER_RAM_PAGES);
+}
+\f
+/* This should be sufficient because the command line buffer is
+ only 128 bytes and arguments are space-delimited. */
+#define ARGC_MAX 64
+
+int argc;
+char *argv[ARGC_MAX + 1];
+
+static void
+argv_init (void)
+{
+ char *cmd_line = ptov (LOADER_CMD_LINE);
+ char *arg, *pos;
+
+ for (arg = strtok_r (cmd_line, " \t\r\n\v", &pos); arg != NULL;
+ arg = strtok_r (NULL, " \t\r\n\v", &pos))
+ {
+ ASSERT (argc < ARGC_MAX);
+ argv[argc++] = arg;
+ }
+ argv[argc] = NULL;
+}
\f
void
power_off (void)