int
main ()
{
int *p;
p = get_gd ();
set_gd (3);
if (*p != 3 || !test_gd (3))
abort ();
p = get_ld ();
set_ld (4);
if (*p != 4 || !test_ld (4))
abort ();
printf ("PASS\n");
return 0;
}
static int
do_test (void)
{
int *p;
p = get_gd ();
set_gd (3);
if (*p != 3 || !test_gd (3))
abort ();
p = get_ld ();
set_ld (4);
if (*p != 4 || !test_ld (4))
abort ();
printf ("PASS\n");
return 0;
}
// Kernel
void kernel(dword magic, dword addr) {
dword * t;
byte * buffer;
multiboot_info_t * multiboot_info;
// Print something
clrscr();
puts("Starting...\n");
// MBoot check
if(magic != MULTIBOOT_BOOTLOADER_MAGIC) {
puts("Invalid magic number!\n");
for(;;);
}
multiboot_info = (multiboot_info_t *)addr;
if (CHECK_FLAG(multiboot_info -> flags, 4) && CHECK_FLAG(multiboot_info -> flags, 5)) {
puts("Invalid! Both bits 4 and 5 are set!\n");
for(;;);
}
printf("multiboot_info_flags = 0x%x\n", multiboot_info -> flags);
if(CHECK_FLAG(multiboot_info -> flags, 0)) {
printf("mem_lower = 0x%x KiB\n", multiboot_info -> mem_lower);
printf("mem_upper = 0x%x KiB\n", multiboot_info -> mem_upper);
}
if(CHECK_FLAG(multiboot_info -> flags, 1)) {
printf("boot_device = 0x%x\n", multiboot_info -> boot_device);
}
if(CHECK_FLAG(multiboot_info -> flags, 2)) {
printf("cmdline = %s\n", (char *)multiboot_info -> cmdline);
}
// Init GDT
set_gd(gd + 0, 0x0, 0x0, 0x0); // zero
set_gd(gd + 1, 0x0, 0xcfffff, 0x9a); // cs
set_gd(gd + 2, 0x0, 0xcfffff, 0x92); // ds
gdtr.limit = 0x2000;
gdtr.gd = gd;
asm("lgdt %0"::"m"(gdtr));
// Init IRQ
init_irq();
// Init IDT
populate_idt(id);
idtr.limit = 0x7ff;
idtr.id = id;
asm("lidt %0"::"m"(idtr));
// Init paging
init_paging();
asm ("" : :"a"(pdbr));
asm("mov %eax, %cr3");
asm("mov %cr0, %eax");
asm("bts $0x1f, %eax");
asm("mov %eax, %cr0");
asm("jmp . + 2");
// Test FAT
fat_init(& media_read, 30);
buffer = malloc(512);
fat_loadfile("test", buffer, 512);
puts((char *)buffer);
// Permit int
asm("sti");
// Test paging
t = (dword *)0x900000;
*t = 7;
// LOOP
for(;;);
}
