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https://github.com/Fennix-Project/Kernel.git
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80 lines
1.5 KiB
ArmAsm
80 lines
1.5 KiB
ArmAsm
/*
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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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.code32
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KERNEL_STACK_SIZE = 0x4000 /* 16KB */
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.extern DetectCPUID
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.extern DetectPSE
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.extern multiboot_main
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.extern LoadGDT32
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.extern BootPageTable
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.section .bootstrap.data, "a"
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MB_HeaderMagic:
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.quad 0
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MB_HeaderInfo:
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.quad 0
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.section .bootstrap.text, "a"
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.global Multiboot_start
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Multiboot_start:
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cli
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mov %eax, [MB_HeaderMagic]
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mov %ebx, [MB_HeaderInfo]
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call DetectCPUID
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cmp $0, %eax
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je .
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call DetectPSE
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cmp $0, %eax
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je .
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mov %cr4, %ecx
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or $0x00000010, %ecx /* PSE */
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mov %ecx, %cr4
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call LoadGDT32
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mov $BootPageTable, %ecx
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mov %ecx, %cr3
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mov %cr0, %ecx
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or $0x80000000, %ecx /* PG */
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mov %ecx, %cr0
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mov $(KernelStack + KERNEL_STACK_SIZE), %esp
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mov $0x0, %ebp
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mov [MB_HeaderMagic], %eax
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mov [MB_HeaderInfo], %ebx
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push %ebx
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push %eax
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call multiboot_main
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.Hang:
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hlt
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jmp .Hang
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.section .bootstrap.bss, "a"
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.align 16
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KernelStack:
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.space KERNEL_STACK_SIZE
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