129 lines
4.3 KiB
ArmAsm
129 lines
4.3 KiB
ArmAsm
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Authors: spectral` ;
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; NeoX ;
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; ;
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; Desc: Master Boot Record for OS/K ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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[BITS 16] ; real mode
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[ORG 0x7C00] ; address where the BIOS/UEFI CSM is loading us
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jmp 0x0000:Start ; far-jump to avoid loading address issues with older BIOSes
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; some older BIOSes could load bootloader.bin at 0x7C00:0x0000
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; while newer ones would load it at 0x0000:0x7C00...
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; here the far-jump sets CS to 0
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bootdb db 'GNUOS/K ' ;Fabricant + n°série Formatage
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sizec dw 512 ;octet/secteur
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db 1 ;secteur/cluster
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reserv dw 1 ;secteur reserv
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nbfat db 2 ;nb de copie de la FAT
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nbfit dw 224 ;taille rep racine
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allclu dw 2880 ;nb secteur du volume si < 32 még
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db 0F0h ;Descripteur de média
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fatsize dw 9 ;secteur/FAT
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nbtrack dw 18 ;secteur/piste
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head dw 2 ;nb de tteb de lecture/écriture
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hidden dd 0 ;nombre de secteur cachs
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dd 0 ;si nbsecteur = 0 nbsect ; the number of sectors
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bootdrv db 0 ;Lecteur de dmarrage
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bootsig db 0 ;NA
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db 29h ;boot signature 29h
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bootsig2 dd 01020304h ;no de serie
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pope db 'COS2000 ' ;nom de volume
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db 'FAT12 ' ;FAT
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;; DATA
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Bootdrv db 0x00
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Starting db 0x0A, 0x0D, 0x07, " GNU GPL OS/K ", 0x0A, 0x0D, 0x0A, 0x0D, 0
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NoLongMode db 0x0A, 0x0D, "ERROR: Your computer is not designed for x64 OS", 0
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A20ERR db 0x0A, 0x0D, "ERROR: Failed to enable A20 line!", 0
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SwErr db 0x0A, 0x0D, "ERROR: Loading failed!", 0
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Init db 0x09, " Checking CPUID", 0
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EnA20 db 0x09, " Enabling A20 line", 0
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Switch db 0x09, " Loading Second Stage", 0
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Pass db " OK", 0x0A, 0x0D, 0
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%define SECOND_STAGE 0x100
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;; INCLUDES
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%include "boot/mbr.inc" ; for Is64Bits
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%include "boot/common.inc" ; for PrintB
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Start:
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pushad
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pushfd
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pushf
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mov [Bootdrv], dl ; dl contains the boot drive. Saving it.
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;; hello world
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push si
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mov si, Starting
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call PrintB
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;; compatibility check
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mov si, Init
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call PrintB
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pop si
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call Is64bits ; in mbr.inc
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jc ErrorNo64
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push si
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mov si, Pass
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call PrintB
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;; enabling A20
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mov si, EnA20
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call PrintB
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pop si
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in al, 0x92
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or al, 2
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out 0x92, al
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jc A20Fail
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push si
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mov si, Pass
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call PrintB
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;; switch to second stage
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mov si, Switch
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call PrintB
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pop si
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;; Reset floppy drive and load second stage
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call LoadSec ; Loading from boot disk
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jc SwFail
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popf
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popfd
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popad
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mov ax, [Bootdrv]
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push ax
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jmp dword SECOND_STAGE:0000 ; Jumping to second stage loader.
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;;END OF MBR
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;;----------------------------------------------------------------------------;;
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A20Fail:
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mov si, A20ERR
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call PrintB
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jmp Die
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SwFail:
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mov si, SwErr
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call PrintB
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jmp Die
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ErrorNo64:
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mov si, NoLongMode
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call PrintB
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Die:
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cli
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hlt ; die nooooow
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jmp Die
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End:
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times 510-($-$$) db 144 ; NOP until 510
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dw 0xAA55 ; magic word
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