| 31,6 → 31,9 |
|---|
| .section K_TEXT_START |
| .global kernel_image_start |
| |
| KTEXT=8 |
| KDATA=16 |
| |
| .code16 |
| # |
| # This is where we require any SPARTAN-kernel-compatible boot loader |
| 44,18 → 47,18 |
|---|
| cli |
| xorw %ax, %ax |
| movw %ax, %ds |
| movw %ax, %ss # initialize stack segment register |
| movl $0x7c00, %esp # initialize stack pointer |
| movw %ax, %ss # initialize stack segment register |
| movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
| |
| call memmap_arch_init |
| |
| lgdt gdtr # initialize Global Descriptor Table register |
| lgdt bsp_bootstrap_gdtr # initialize Global Descriptor Table register |
| |
| movl %cr0, %eax |
| orl $0x1, %eax |
| movl %eax, %cr0 # switch to protected mode |
| movl %eax, %cr0 # switch to protected mode |
| |
| jmpl $8, $boot_image_start |
| jmpl $KTEXT, $boot_image_start |
| |
| .code32 |
| .align 4 |
| 70,7 → 73,7 |
|---|
| .long multiboot_image_start + BOOT_OFFSET |
| |
| boot_image_start: |
| movw $16, %ax |
| movw $KDATA, %ax |
| movw %ax, %es |
| movw %ax, %gs |
| movw %ax, %fs |
| 84,8 → 87,8 |
|---|
| movb $0xdf, %al |
| outb %al, $0x60 |
| |
| movl $0x8000, %esi |
| movl $0x8000 + BOOT_OFFSET, %edi |
| movl $BOOTSTRAP_OFFSET, %esi |
| movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
| movl $_hardcoded_kernel_size, %ecx |
| cld |
| rep movsb |
| 93,21 → 96,21 |
|---|
| jmp protected |
| |
| multiboot_image_start: |
| movl $0x7c00, %esp # initialize stack pointer |
| movl BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
| |
| lgdt gdtr |
| lgdt gdtr # initialize Global Descriptor Table register |
| |
| movw $16, %ax |
| movw $KDATA, %ax |
| movw %ax, %es |
| movw %ax, %gs |
| movw %ax, %fs |
| movw %ax, %ds # kernel data + stack |
| movw %ax, %ds # kernel data + stack |
| movw %ax, %ss |
| |
| call map_kernel # map kernel and turn paging on |
| call map_kernel # map kernel and turn paging on |
| |
| protected: |
| call main_bsp # never returns |
| call main_bsp # never returns |
| |
| cli |
| hlt |