| 23,7 → 23,6 |
|---|
| LIP_BUFFER_SIZE = 0x100 |
| FILE_BUFFER_SIZE = 0x1000 |
| |
| KERNEL_TRAMPOLINE = 0x8f80 ; just before BOOT_LO |
| KERNEL_BASE = 0x10000 |
| RAMDISK_BASE = 0x100000 |
| MAX_FILE_SIZE = 0x10000000 |
| 819,15 → 818,8 |
|---|
| mov ecx, 0x17 |
| rep movsb |
| |
| ; kernel trampoline |
| mov rsi, kernel_trampoline |
| mov rdi, KERNEL_TRAMPOLINE |
| mov ecx, kernel_trampoline.size |
| rep movsb |
| lgdt [cs:GDTR] |
| |
| mov rax, GDTR |
| lgdt [cs:rax] |
| |
| mov ax, DATA_32_SELECTOR |
| mov ds, ax |
| mov es, ax |
| 836,10 → 828,29 |
|---|
| mov ss, ax |
| |
| push CODE_32_SELECTOR |
| mov rax, KERNEL_TRAMPOLINE |
| lea rax, [.next] |
| push rax |
| retf |
| use32 |
| align 16 |
| .next: |
| mov eax, cr0 |
| and eax, not CR0_PG |
| mov cr0, eax |
| |
| mov ecx, MSR_AMD_EFER |
| rdmsr |
| btr eax, 8 ; LME |
| wrmsr |
| |
| mov eax, cr4 |
| and eax, not CR4_PAE |
| mov cr4, eax |
| |
| push KERNEL_BASE |
| retn |
| |
| use64 |
| .error: |
| mov rbx, [efi_table] |
| mov rbx, [rbx+EFI_SYSTEM_TABLE.ConOut] |
| 1075,25 → 1086,7 |
|---|
| pop rdi rsi rdx rcx rbx rax |
| ret |
| |
| use32 |
| kernel_trampoline: |
| org KERNEL_TRAMPOLINE |
| mov eax, cr0 |
| and eax, not CR0_PG |
| mov cr0, eax |
| |
| mov ecx, MSR_AMD_EFER |
| rdmsr |
| btr eax, 8 ; LME |
| wrmsr |
| |
| mov eax, cr4 |
| and eax, not CR4_PAE |
| mov cr4, eax |
| |
| push KERNEL_BASE |
| retn |
| |
| section '.rodata' data readable |
| align 16 |
| GDTR: |
| dw 4*8-1 |
| 1104,10 → 1097,7 |
|---|
| dw 0FFFFh,0,9A00h,0CFh ; 32-bit code |
| dw 0FFFFh,0,9200h,0CFh ; flat data |
| dw 0FFFFh,0,9A00h,0AFh ; 64-bit code |
| assert $ < BOOT_LO |
| kernel_trampoline.size = $ - KERNEL_TRAMPOLINE |
| |
| section '.rodata' data readable |
| gopuuid db EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID |
| lipuuid db EFI_LOADED_IMAGE_PROTOCOL_GUID |
| sfspguid db EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID |