| 103,18 → 103,50 |
|---|
| |
| lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
| |
| movw $KDATA, %ax |
| movw %ax, %es |
| movw %ax, %gs |
| movw %ax, %fs |
| movw %ax, %ds # kernel data + stack |
| movw %ax, %ss |
| movw $KDATA, %cx |
| movw %cx, %es |
| movw %cx, %gs |
| movw %cx, %fs |
| movw %cx, %ds # kernel data + stack |
| movw %cx, %ss |
| |
| jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
| multiboot_meeting_point: |
| |
| pushl %ebx |
| pushl %eax |
| |
| call map_kernel # map kernel and turn paging on |
| |
| popl %eax |
| popl %ebx |
| cmpl $MULTIBOOT_LOADER_MAGIC, %eax |
| je valid_boot |
| |
| # ... |
| |
| jmp invalid_boot |
| |
| valid_boot: |
| |
| movl (%ebx), %eax |
| |
| # ... check flags in eax |
| |
| movl 4(%ebx), %ecx |
| addl 8(%ebx), %ecx |
| movl %ecx, e801memorysize |
| |
| # movl 44(%ebx), %ecx |
| xorl %ecx, %ecx |
| movl %ecx, e820counter |
| # movl 48(%ebx), %esi |
| # movl $e820table, %edi |
| # cld |
| # rep movsb |
| |
| invalid_boot: |
| |
| call main_bsp - BOOT_OFFSET # never returns |
| |
| cli |