| 27,6 → 27,7 |
|---|
| # |
| |
| #include <arch/boot/boot.h> |
| #include <arch/boot/memmapasm.h> |
| |
| .section K_TEXT_START |
| .global kernel_image_start |
| 80,8 → 81,6 |
|---|
| movw %ax, %ds # kernel data + stack |
| movw %ax, %ss |
| |
| call map_kernel # map kernel and turn paging on |
| |
| movb $0xd1, %al # enable A20 using the keyboard controller |
| outb %al, $0x64 |
| movb $0xdf, %al |
| 93,6 → 92,8 |
|---|
| cld |
| rep movsb |
| |
| call map_kernel # map kernel and turn paging on |
| |
| call main_bsp # never returns |
| |
| cli |
| 113,38 → 114,89 |
|---|
| jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
| multiboot_meeting_point: |
| |
| pushl %ebx |
| pushl %ebx # save parameters from GRUB |
| pushl %eax |
| |
| movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi |
| movl $BOOTSTRAP_OFFSET, %edi |
| movl $_hardcoded_unmapped_size, %ecx |
| cld |
| rep movsb |
| |
| call map_kernel # map kernel and turn paging on |
| |
| popl %eax |
| popl %ebx |
| cmpl $MULTIBOOT_LOADER_MAGIC, %eax |
| cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature |
| je valid_boot |
| |
| # ... |
| |
| xorl %ecx, %ecx # no memory size or map available |
| movl %ecx, e801memorysize |
| movl %ecx, e820counter |
| |
| jmp invalid_boot |
| |
| |
| valid_boot: |
| |
| movl (%ebx), %eax |
| movl (%ebx), %eax # ebx = physical address of struct multiboot_info |
| |
| # ... check flags in eax |
| bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid) |
| jc mem_valid |
| |
| xorl %ecx, %ecx |
| jmp mem_invalid |
| |
| mem_valid: |
| movl 4(%ebx), %ecx # mbi->mem_lower |
| addl 8(%ebx), %ecx # mbi->mem_upper |
| |
| movl 4(%ebx), %ecx |
| addl 8(%ebx), %ecx |
| mem_invalid: |
| movl %ecx, e801memorysize |
| |
| # movl 44(%ebx), %ecx |
| xorl %ecx, %ecx |
| movl %ecx, e820counter |
| # movl 48(%ebx), %esi |
| # movl $e820table, %edi |
| # cld |
| # rep movsb |
| bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid) |
| jc mmap_valid |
| |
| xorl %edx, %edx |
| jmp mmap_invalid |
| |
| mmap_valid: |
| movl 44(%ebx), %ecx # mbi->mmap_length |
| movl 48(%ebx), %esi # mbi->mmap_addr |
| movl $e820table, %edi |
| xorl %edx, %edx |
| |
| mmap_loop: |
| cmpl $0, %ecx |
| jle mmap_end |
| |
| movl 4(%esi), %eax # mmap->base_addr_low |
| movl %eax, (%edi) |
| |
| movl 8(%esi), %eax # mmap->base_addr_high |
| movl %eax, 4(%edi) |
| |
| movl 12(%esi), %eax # mmap->length_low |
| movl %eax, 8(%edi) |
| |
| movl 16(%esi), %eax # mmap->length_high |
| movl %eax, 12(%edi) |
| |
| movl 20(%esi), %eax # mmap->type |
| movl %eax, 16(%edi) |
| |
| movl (%esi), %eax # mmap->size |
| addl $0x4, %eax |
| addl %eax, %esi |
| subl %eax, %ecx |
| addl $MEMMAP_E820_RECORD_SIZE, %edi |
| incl %edx |
| jmp mmap_loop |
| |
| mmap_end: |
| |
| mmap_invalid: |
| movl %edx, e820counter |
| |
| invalid_boot: |
| |
| call main_bsp - BOOT_OFFSET # never returns |