70 lines
1.2 KiB
ArmAsm
70 lines
1.2 KiB
ArmAsm
;; File: head.s
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[BITS 32]
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%include "machdep.inc"
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%include "sys/multiboot.inc"
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%include "sys/i386/registers.inc"
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%include "sys/i386/mmu.inc"
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;; Define: MB_HDR_FLAGS
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MB_HDR_FLAGS equ MB_HDR_ALIGN | MB_HDR_MEMINFO | MB_HDR_VIDEO
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section .multiboot.data
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align 4
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istruc mb_header
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at mb_header.magic, dd MB_HDR_MAGIC
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at mb_header.flags, dd MB_HDR_FLAGS
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at mb_header.checksum, dd -(MB_HDR_MAGIC + MB_HDR_FLAGS)
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; video mode info
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at mb_header.mode_type, dd 0
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at mb_header.width, dd 1024
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at mb_header.height, dd 768
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at mb_header.depth, dd 32
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iend
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section .multiboot.text
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;; Function: entry
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;;
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;;
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;; in:
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;; EAX - Multiboot magic
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;; EBX - Multiboot structure
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;;
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;; out:
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;; none
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;;
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global entry
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entry:
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extern stack_top
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mov esp, V2P(stack_top)
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;; save boot params
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mov edi, eax
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mov esi, ebx
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extern feat_detect
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call feat_detect
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;; setup 4MB paging
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;; TODO: check if 4MB paging is available
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mov eax, cr4
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or eax, CR4_PSE
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mov cr4, eax
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extern page_directory
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mov eax, V2P(page_directory)
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mov cr3, eax
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;; enable paging
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mov eax, cr0
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or eax, CR0_PG | CR0_PE | CR0_WP
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mov cr0, eax
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extern page_directory
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mov eax, page_directory - KERNBASE
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extern kernel_start
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mov ebx, kernel_start
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