/* Initializes the kernel TSS. */
void
tss_init (void)
{
/* Our TSS is never used in a call gate or task gate, so only a
few fields of it are ever referenced, and those are the only
ones we initialize. */
tss = palloc_get_page (PAL_ASSERT | PAL_ZERO);
tss->ss0 = SEL_KDSEG;
tss->bitmap = 0xdfff;
tss_update ();
}
void boot_64(uint32_t magic, uint32_t multiboot) {
// checking multiboot magic variable.
VGA_AT(0,0) = VGA_ENTRY('H', WHITE_ON_BLACK);
if (magic != MULTIBOOT_BOOTLOADER_MAGIC) {
VGA_AT(0,1) = VGA_ENTRY('!', WHITE_ON_BLACK);
kernel_panic();
}
// copying multiboot data.
VGA_AT(0,1) = VGA_ENTRY('E', WHITE_ON_BLACK);
multiboot_info_t *info = (multiboot_info_t *)kernel_p2v((uintptr_t)multiboot);
switch (multiboot_copy(info)) {
case MULTIBOOT_TOO_MANY_MEMORY_MAPS:
VGA_AT(0,2) = VGA_ENTRY('?', WHITE_ON_BLACK);
kernel_panic();
case MULTIBOOT_TOO_MANY_MODULES:
VGA_AT(0,2) = VGA_ENTRY('?', WHITE_ON_BLACK);
kernel_panic();
case MULTIBOOT_TOO_MANY_ELF_HEADERS:
VGA_AT(0,2) = VGA_ENTRY('.', WHITE_ON_BLACK);
kernel_panic();
}
// we no longer need the original memory map at zero address.
VGA_AT(0,2) = VGA_ENTRY('L', WHITE_ON_BLACK);
page_set_pdpt(0, 0, 0);
page_invalidate_all();
// initialize page allocators.
VGA_AT(0,3) = VGA_ENTRY('L', WHITE_ON_BLACK);
lomem_init();
himem_init();
// initialize CPUs.
VGA_AT(0,4) = VGA_ENTRY('B', WHITE_ON_BLACK);
cpu_enable_features();
cpu_init();
service_init();
gdt_init(); // adds per-cpu TSS into GDT.
tss_update();
// initialize interrupt handling.
VGA_AT(0,5) = VGA_ENTRY('E', WHITE_ON_BLACK);
pic_init();
idt_init();
// kick-start the core service.
VGA_AT(0,6) = VGA_ENTRY('N', WHITE_ON_BLACK);
kernel_start_core();
// start scheduler and do stuff.
VGA_AT(0,7) = VGA_ENTRY('D', WHITE_ON_BLACK);
kernel_main();
}
