| 213,20 → 213,28 |
|---|
| map_kernel: |
| # |
| # 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. |
| # For simplicity, we map the entire 4G space. |
| # |
| movl %cr4, %ecx |
| orl $(1<<4), %ecx |
| movl %ecx, %cr4 # turn PSE on |
| |
| movl $(page_directory+0), %esi |
| movl $(page_directory+2048), %edi |
| xorl %ecx, %ecx |
| xorl %ebx, %ebx |
| 0: |
| movl $((1<<7)|(1<<0)), %eax |
| movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
| orl %ebx, %eax |
| movl %eax, (%esi,%ecx,4) # mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M |
| movl %eax, (%edi,%ecx,4) # mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M |
| addl $(4*1024*1024), %ebx |
| |
| movl $(page_directory+2048), %edx |
| movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
| incl %ecx |
| cmpl $512, %ecx |
| jl 0b |
| |
| leal page_directory, %eax |
| movl %eax, %cr3 |
| movl %esi, %cr3 |
| |
| # turn paging on |
| movl %cr0, %ebx |