| .code16gcc |
| #include "assembly.h" |
| .section .init |
| ENTRY(pm_entry) |
| xor %ax, %ax |
| mov %ax, %ds |
| mov %ax, %es |
| mov %ax, %ss |
| mov $0x7c00, %sp |
| |
| mov %cr0, %eax |
| or $1, %eax |
| mov %eax, %cr0 |
| lgdtl %cs:0xff80 + gdt32_descr - pm_entry |
| ljmpl $8, $0xffffff80 + 2f - pm_entry |
| 2: |
| .code32 |
| mov $16, %ax |
| mov %ax, %ds |
| mov %ax, %es |
| mov %ax, %ss |
| ljmp $8, $0xffff0000 |
| |
| gdt32: |
| .quad 0 |
| .quad 0x00cf9b000000ffff // flat 32-bit code segment |
| .quad 0x00cf93000000ffff // flat 32-bit data segment |
| gdt32_end: |
| |
| gdt32_descr: |
| .word gdt32_end - gdt32 - 1 |
| .long 0xffffff80 + gdt32 - pm_entry |
| ENTRY_END(pm_entry) |
| |
| .code16gcc |
| .section .resetvector |
| jmp pm_entry |
| |
