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assembly - 如何从软盘运行简单的操作系统?

转载 作者:行者123 更新时间:2023-12-04 04:45:34 25 4
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我最近一直在尝试在 Assembly 中制作操作系统,但是我遇到了一些问题。我可以在 VirtualBox 中运行我的操作系统,但是一旦我尝试从软盘驱动器运行它,它只会告诉我从软盘驱动器中删除媒体。我已经在多台计算机上尝试过,但它们都说相同。我不知道还能尝试什么,我会把我的源代码放在下面,以防它对你有帮助。
提前致谢,
jack ·扎卡里亚·尼克松。

BITS 16

jmp short start ;jump to start of os, past disk description
nop ;pad out before description

OEMLabel db "FIRSTBOOT" ; Disk label
BytesPerSector dw 512 ; Bytes per sector
SectorsPerCluster db 1 ; Sectors per cluster
ReservedForBoot dw 1 ; Reserved sectors for boot record
NumberOfFats db 2 ; Number of copies of the FAT
RootDirEntries dw 224 ; Number of entries in root dir
LogicalSectors dw 2880 ; Number of logical sectors
MediumByte db 0F0h ; Medium descriptor byte
SectorsPerFat dw 9 ; Sectors per FAT
SectorsPerTrack dw 18 ; Sectors per track (36/cylinder)
Sides dw 2 ; Number of sides/heads
HiddenSectors dd 0 ; Number of hidden sectors
LargeSectors dd 0 ; Number of LBA sectors
DriveNo dw 0 ; Drive No: 0
Signature db 41 ; Drive signature: 41 for floppy
VolumeID dd 00000000h ; Volume ID: any number
VolumeLabel db "FIRSTOS "; Volume Label: any 11 chars
FileSystem db "FAT12 " ; File system type: don't change!

start:
mov ax, 07C0h ;4k stack space after bootloader
add ax, 288 ;4096 + 512 devided by 16 bytes per paragraph
mov ss, ax
mov sp, 4096

mov ax, 07C0h ;set data segment to where we are loaded
mov ds, ax

mov si, text_string ;put string position in SI
call print_string ;calls print string routine

jmp $ ;Jumps here to make infinate loop


text_string db 'This is my awesome OS called FirstOS! I am currently building it from the ground up!', 0

print_string: ;routine to outpu string in SI to screen
mov ah, 0Eh ;int 10h 'print char' function

.repeat:
lodsb ;get char from string
cmp al, 0
je .done ;if char = 0 then jump to .done
int 10h ;else print char
jmp .repeat ;then repeat process

.done:
ret ;return to other code


times 510-($-$$) db 0 ;pad remainder of boot sector with 0s
dw 0AA55h ;The standard pc boot signature

再次感谢:)

最佳答案

它正在工作!我发现问题只是我没有正确地将图像写入软盘!谢谢你的帮助。如果其他人有同样的问题,我找到的最好的软件叫做 rawwrite .它非常易于使用且非常快速。
再次感谢,
jack ·扎卡里亚·尼克松。

关于assembly - 如何从软盘运行简单的操作系统?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18235964/

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