| 101,33 → 101,117 |
|---|
| shr $16, %ebx |
| mov %bx, KA2PA(vesa_bpp) |
| #endif |
| |
| |
| call map_kernel # map kernel and turn paging on |
| |
| |
| movl grub_eax, %eax |
| movl grub_ebx, %ebx |
| cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature |
| je valid_boot |
| |
| |
| xorl %ecx, %ecx # no memory map available |
| movl %ecx, e820counter |
| |
| |
| jmp invalid_boot |
| |
| |
| valid_boot: |
| |
| movl (%ebx), %eax # ebx = physical address of struct multiboot_info |
| |
| bt $3, %eax # mbi->flags[3] (mods_count, mods_addr valid) |
| jc mods_valid |
| |
| xorl %ecx, %ecx |
| movl %ecx, init |
| jmp mods_end |
| |
| mods_valid: |
| |
| movl 20(%ebx), %ecx # mbi->mods_count |
| movl %ecx, init |
| |
| cmpl $0, %ecx |
| je mods_end |
| |
| movl 24(%ebx), %esi # mbi->mods_addr |
| movl $init, %edi |
| |
| mods_loop: |
| |
| movl 0(%esi), %edx # mods->mod_start |
| addl $0x80000000, %edx |
| movl %edx, 4(%edi) |
| |
| movl 4(%esi), %edx |
| subl 0(%esi), %edx # mods->mod_end - mods->mod_start |
| movl %edx, 8(%edi) |
| |
| addl $16, %esi |
| addl $8 , %edi |
| |
| loop mods_loop |
| |
| mods_end: |
| |
| 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: |
| |
| #ifdef CONFIG_SMP |
| |
| # copy AP bootstrap routines below 1 MB |
| |
| movl $BOOT_OFFSET, %esi |
| movl $AP_BOOT_OFFSET, %edi |
| movl $_hardcoded_unmapped_size, %ecx |
| rep movsb |
| |
| #endif |
| |
| movl grub_eax, %eax |
| movl grub_ebx, %ebx |
| call main_bsp # never returns |
| |
| # ia32_boot(grub_eax, grub_ebx) |
| pushl %ebx |
| pushl %eax |
| call ia32_cboot # Does not return. |
| |
| # Not reached. |
| |
| invalid_boot: |
| |
| cli |
| hlt |
| |