midgard/tabs
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Read all the sectors

Browse source
This commit is contained in:
Robbe Van Herck 2019-12-27 17:57:36 +01:00
parent bd62352513
commit 2d21f3114f
No known key found for this signature in database
GPG key ID: A66F76F7B81BD784
2 changed files with 18 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

BIN
drive.bin
View file

Binary file not shown.

22
main.asm
View file

@ -1,3 +1,5 @@
DISK_ID EQU 0x81
org 0x7C00 org 0x7C00
bits 16 bits 16
@ -75,7 +77,7 @@ ret
; reset disk system ; reset disk system
mov ah, 0x00 mov ah, 0x00
mov dl, 0x81 mov dl, DISK_ID
int 0x13 int 0x13
; print result on error ; print result on error
@ -84,16 +86,23 @@ mov bl, ah
call .puthex call .puthex
.reset_disk_no_error: .reset_disk_no_error:
; Read sector 1 into memory push byte 0
.read_disk_loop
pop cx
inc cl
push cx
; Read sector dl into memory
mov ah, 0x02 mov ah, 0x02
mov al, 0x01 ; number of sectors mov al, 0x01 ; number of sectors
mov ch, 0x00 ; cylinder number, low 8 bits mov ch, 0x00 ; cylinder number, low 8 bits
mov cl, 0x01 ; cylinder number, high 2 bits + sector number (6 bits) ; mov cl, 0x01 ; cylinder number, high 2 bits + sector number (6 bits)
mov dh, 0x00 ; head number mov dh, 0x00 ; head number
mov dl, 0x81 ; drive number mov dl, DISK_ID ; drive number
mov bx, .data ; data buffer mov bx, .data ; data buffer
int 0x13 int 0x13
jc .read_disk_error
; print result on error ; print result on error
jnc .read_disk_no_error jnc .read_disk_no_error
mov bl, ah mov bl, ah
@ -103,11 +112,16 @@ call .puthex
; print string ; print string
mov bx, .data mov bx, .data
call .puts call .puts
jmp .read_disk_loop
.read_disk_error:
.end: .end:
hlt hlt
.data: .data:
; print padding nullbytes
times 510 - ($ - $$) db 0 times 510 - ($ - $$) db 0
; write magic string
dw 0xAA55 dw 0xAA55