mirror of
https://github.com/Fennix-Project/Kernel.git
synced 2025-05-27 15:04:33 +00:00
131 lines
2.8 KiB
NASM
131 lines
2.8 KiB
NASM
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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[bits 16]
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TRAMPOLINE_BASE equ 0x2000
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extern StartCPU
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global _trampoline_start
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_trampoline_start:
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cli
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mov ax, 0x0
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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o32 lgdt [ProtectedMode_gdtr - _trampoline_start + TRAMPOLINE_BASE]
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mov eax, cr0
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or al, 0x1
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mov cr0, eax
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jmp 0x8:(Trampoline32 - _trampoline_start + TRAMPOLINE_BASE)
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[bits 32]
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section .text
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Trampoline32:
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mov bx, 0x10
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mov ds, bx
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mov es, bx
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mov ss, bx
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mov eax, dword [0x500]
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mov cr3, eax
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mov eax, cr4
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or eax, 1 << 5 ; Set the PAE-bit, which is the 6th bit (bit 5).
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or eax, 1 << 7
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mov cr4, eax
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mov ecx, 0xc0000080
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rdmsr
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or eax,1 << 8 ; LME
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wrmsr
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mov eax, cr0
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or eax, 1 << 31
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mov cr0, eax
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lgdt [LongMode_gdtr - _trampoline_start + TRAMPOLINE_BASE]
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jmp 0x8:(Trampoline64 - _trampoline_start + TRAMPOLINE_BASE)
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[bits 64]
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Trampoline64:
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov ax, 0x0
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mov fs, ax
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mov gs, ax
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lgdt [0x580]
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lidt [0x590]
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mov rsp, [0x570]
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mov rbp, 0x0 ; Terminate stack traces here.
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; Reset RFLAGS.
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push 0x0
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popf
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mov rax, qword vcode64
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call vcode64
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vcode64:
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push rbp
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; Set up SSE
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mov rax, cr0
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; btr eax, 2
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; bts eax, 1
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; mov cr0, rax
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mov rax, cr4
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bts eax, 9
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bts eax, 10
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mov cr4, rax
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mov rax, qword TrampolineExit
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call rax
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align 16
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LongMode_gdtr:
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dw LongModeGDTEnd - LongModeGDTStart - 1
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dq LongModeGDTStart - _trampoline_start + TRAMPOLINE_BASE
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align 16
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LongModeGDTStart:
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dq 0 ; NULL segment
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dq 0x00AF98000000FFFF ; Code segment
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dq 0x00CF92000000FFFF ; Data segment
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LongModeGDTEnd:
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align 16
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ProtectedMode_gdtr:
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dw ProtectedModeGDTEnd - ProtectedModeGDTStart - 1
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dd ProtectedModeGDTStart - _trampoline_start + TRAMPOLINE_BASE
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align 16
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ProtectedModeGDTStart:
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dq 0 ; NULL segment
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dq 0x00CF9A000000FFFF ; Code segment
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dq 0x00CF92000000FFFF ; Data segment
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ProtectedModeGDTEnd:
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align 16
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ProtectedMode_idtr:
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dw 0
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dd 0
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dd 0
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align 16
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global _trampoline_end
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_trampoline_end:
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TrampolineExit:
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call StartCPU
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times 512 - ($-$$) db 0
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