83 lines
1.2 KiB
NASM
83 lines
1.2 KiB
NASM
;; File: kernel.asm
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format binary
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include 'const.inc'
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org KBASE
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use32
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jmp short kmain
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db 'STPDKRNL'
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db 32 dup(0)
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;; Function: kmain
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;;
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;; Parameters:
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;;
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;; EAX - Boot Magic
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;; EBX - Boot structure address
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;;
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kmain:
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mov esp, stack_top
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cmp eax, STPDBOOT_MAGIC
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jne .error_magic
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; Copy boot structure
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mov ecx, sizeof.BootInfo
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mov esi, ebx
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mov edi, boot_structure
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rep movsb
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; print hello world
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mov [0xC00B8000], dword 0x08740953
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mov [0xC00B8004], dword 0x05700675
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mov [0xC00B8008], dword 0x03640469
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mov [0xC00B800C], dword 0x0153024F
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mov esi, szMsgKernelAlive
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call klog
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; init pmm (kend, 0x400000)
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mov eax, kend
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mov ebx, 0xC0400000
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call pmm_init
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; init vmm
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call mm_init
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mov eax, 0xC0400000
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mov ebx, [boot_structure.high_mem]
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add ebx, KERNEL_VIRT_BASE
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call pmm_free_range
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; idt, gdt
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.halt:
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hlt
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jmp $
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.error_magic:
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mov esi, szErrorBootProtocol
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.error:
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call klog
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jmp .halt
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include 'sys/bootinfo.inc'
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include 'klog.inc'
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include 'dev/vga_console.inc'
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include 'mm/mm.inc'
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szMsgKernelAlive db "Kernel is alive", 0
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szErrorBootProtocol db "Error: wrong magic number", 0
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boot_structure BootInfo
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align 4096
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stack_bottom:
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rb 0x4000
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stack_top:
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kend:
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