+#include "init.h"
#include <stdint.h>
#include <stddef.h>
#include <limits.h>
#include "io.h"
#include "kbd.h"
#include "lib.h"
+#include "loader.h"
#include "malloc.h"
#include "mmu.h"
+#include "paging.h"
#include "palloc.h"
#include "random.h"
#include "serial.h"
#include "vga.h"
#ifdef FILESYS
#include "filesys.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 init_page_table (void);
-static void setup_gdt (void);
-void power_off (void);
-
-struct thread *a, *b;
+static void ram_init (void);
+static void gdt_init (void);
+static void argv_init (void);
static void
-tfunc (void *aux UNUSED)
+main_thread (void *aux UNUSED)
{
- for (;;)
- {
- size_t count, i;
- if (random_ulong () % 5 == 0)
- {
- printk ("%s exiting\n", thread_current ()->name);
- break;
- }
- count = random_ulong () % 25 * 10000;
- printk ("%s waiting %zu: ", thread_current ()->name, count);
- for (i = 0; i < count; i++);
- printk ("%s\n", thread_current ()->name);
- }
+#ifdef FILESYS
+ disk_init ();
+ filesys_init (true);
+ filesys_self_test ();
+#endif
}
int
main (void)
{
- extern char _text, _end, __bss_start;
-
- /* Clear out the BSS segment. */
- memset (&__bss_start, 0, &_end - &__bss_start);
-
+ /* Initialize prerequisites for calling printk(). */
+ ram_init ();
vga_init ();
serial_init ();
- /* 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 - 8);
-
- printk ("Initializing nachos-x86, %d kB RAM detected.\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 * NBPG),
- (void *) (PHYS_BASE + ram_pages * NBPG));
-
- init_page_table ();
- setup_gdt ();
+ /* 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
-
- thread_init ();
-
- {
- struct thread *t;
- int i;
-
- for (i = 0; i < 4; i++)
- {
- char name[2];
- name[0] = 'a' + i;
- name[1] = 0;
- t = thread_create (name, tfunc, NULL);
- }
- thread_start (t);
- }
-
- printk ("Done!\n");
- return 0;
-}
-
-/* Populates the page directory and page table with the kernel
- virtual mapping. */
-static void
-init_page_table (void)
-{
- uint32_t *pd, *pt;
- uint32_t paddr;
-
- pd = palloc_get (PAL_ASSERT | PAL_ZERO);
- pt = NULL;
- for (paddr = 0; paddr < NBPG * ram_pages; paddr += NBPG)
- {
- uint32_t vaddr = paddr + PHYS_BASE;
- size_t pde_idx = PDENO(vaddr);
- size_t pte_idx = PTENO(vaddr);
-
- if (pd[pde_idx] == 0)
- {
- pt = palloc_get (PAL_ASSERT | PAL_ZERO);
- pd[pde_idx] = (uint32_t) vtop (pt) | PG_U | PG_W | PG_P;
- }
-
- pt[pte_idx] = paddr | PG_U | PG_W | PG_P;
- }
-
- /* Set the page table. */
- asm volatile ("movl %0,%%cr3" :: "r" (vtop (pd)));
+ /* Do everything else in a system thread. */
+ thread_init ("main", main_thread, NULL);
}
static uint64_t
uint32_t e0 = ((limit & 0xffff) /* Limit 15:0. */
| (base << 16)); /* Base 15:0. */
uint32_t e1 = (((base >> 16) & 0xff) /* Base 23:16. */
- | ( system << 12) /* 0=system, 1=code/data. */
- | ( type << 8) /* Segment type. */
+ | (system << 12) /* 0=system, 1=code/data. */
+ | (type << 8) /* Segment type. */
| (dpl << 13) /* Descriptor privilege. */
| (1 << 15) /* Present. */
| (limit & 0xf0000) /* Limit 16:19. */
| (1 << 22) /* 32-bit segment. */
- | ( granularity << 23) /* Byte/page granularity. */
+ | (granularity << 23) /* Byte/page granularity. */
| (base & 0xff000000)); /* Base 31:24. */
return e0 | ((uint64_t) e1 << 32);
}
}
static uint64_t
-make_tss_desc (uint32_t base)
+make_tss_desc (void *vaddr)
{
- return make_seg_desc (base, 0x67, SYS_SYSTEM, TYPE_TSS_32_A, 0, GRAN_BYTE);
+ return make_seg_desc ((uint32_t) vaddr,
+ 0x67, SYS_SYSTEM, TYPE_TSS_32_A, 0, GRAN_BYTE);
}
-uint64_t gdt[SEL_CNT];
+static uint64_t gdt[SEL_CNT];
struct tss *tss;
/* Sets up a proper GDT. The bootstrap loader's GDT didn't
include user-mode selectors or a TSS. */
static void
-setup_gdt (void)
+gdt_init (void)
{
uint64_t gdtr_operand;
few fields of it are ever referenced, and those are the only
ones we initialize. */
tss = palloc_get (PAL_ASSERT | PAL_ZERO);
- tss->esp0 = (uint32_t) ptov(0xc0020000);
+ tss->esp0 = (uint32_t) ptov(0x20000);
tss->ss0 = SEL_KDSEG;
tss->bitmap = 0xdfff;
gdt[SEL_KDSEG / sizeof *gdt] = make_data_desc (0);
gdt[SEL_UCSEG / sizeof *gdt] = make_code_desc (3);
gdt[SEL_UDSEG / sizeof *gdt] = make_data_desc (3);
- gdt[SEL_TSS / sizeof *gdt] = make_tss_desc (vtop (tss));
+ gdt[SEL_TSS / sizeof *gdt] = make_tss_desc (tss);
/* Load GDTR, TR. */
gdtr_operand = make_dtr_operand (sizeof gdt - 1, gdt);
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
-void
-power_off (void)
+/* 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)
{
- const char s[] = "Shutdown";
- const char *p;
+ char *cmd_line = ptov (LOADER_CMD_LINE);
+ char *arg, *pos;
- printk ("Powering off...\n");
- for (p = s; *p != '\0'; p++)
- outb (0x8900, *p);
- for (;;);
+ 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;
}
projects / pintos-anon / blobdiff