mirror of https://github.com/E-Almqvist/eOS
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
870 B
45 lines
870 B
disk_read:
|
|
push dx ; store dx on stack so that we can compare later
|
|
|
|
mov ah, BIOS_DISK_READ ; specify function
|
|
|
|
mov al, dh ; read dh amount of sectors
|
|
mov ch, 0x00 ; CYLINDER
|
|
mov dh, 0x00 ; HEAD
|
|
mov cl, 0x02 ; SECTOR
|
|
|
|
int BIOS_DISK_INT ; interrupt
|
|
|
|
; Error checks
|
|
jc read_error ; carry flag set -> error
|
|
|
|
pop dx
|
|
cmp dh, al ; if dh != al then error
|
|
jne sector_error
|
|
|
|
ret
|
|
|
|
sector_error:
|
|
mov bx, sector_error_string
|
|
call println
|
|
|
|
read_error:
|
|
; Inform the user
|
|
mov bx, read_error_string
|
|
call println
|
|
|
|
; Print the error
|
|
mov bx, error_code_string
|
|
call print
|
|
|
|
mov dh, ah
|
|
call print_hex
|
|
|
|
mov bx, [ASCII_END]
|
|
call println
|
|
|
|
jmp $
|
|
|
|
read_error_string: db ASCII_CARRIAGE_RETURN, ASCII_LINEBREAK, "ERROR! Disk read failed.", ASCII_END
|
|
error_code_string: db "Error code: ", ASCII_END
|
|
sector_error_string: db "Invalid number of sectors read!", ASCII_END
|
|
|