| 39,8 → 39,8 |
|---|
| # switch to protected mode. |
| # |
| kernel_image_start: |
| cli |
| call memmap_arch_init |
| cli |
| xorw %ax,%ax |
| movw %ax,%ds |
| lgdt gdtr |
| 62,8 → 62,39 |
|---|
| |
| lidt idtr |
| |
| call main_bsp # never returns |
| # |
| # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
| # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
| # |
| movl %cr4, %ecx |
| orl $(1<<4), %ecx |
| movl %ecx, %cr4 # turn PSE on |
| |
| movl $((1<<7)|(1<<0)), %eax |
| movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
| |
| movl $(page_directory+(4096/2)), %edx |
| movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
| |
| leal page_directory, %eax |
| movl %eax, %cr3 |
| |
| # turn on paging |
| movl %cr0, %ebx |
| orl $(1<<31), %ebx |
| movl %ebx, %cr0 |
| |
| movl $_hardcoded_ktext_size, hardcoded_ktext_size |
| movl $_hardcoded_kdata_size, hardcoded_kdata_size |
| movl $_hardcoded_load_address, hardcoded_load_address |
| |
| call main_bsp # never returns |
| |
| cli |
| hlt |
| |
| .section K_DATA_START |
| |
| .align 4096 |
| page_directory: |
| .space 4096, 0 |