161 lines
2.6 KiB
NASM
161 lines
2.6 KiB
NASM
|
USE16
|
||
|
|
format binary as 'bin'
|
||
|
|
|
||
|
|
include 'macros.asm'
|
||
|
|
include 'constants.asm'
|
||
|
|
|
||
|
|
org 7C00h
|
||
|
|
|
||
|
|
start:
|
||
|
|
mov byte [BOOT_DRIVE], dl
|
||
|
|
mov ax, [0410h]
|
||
|
|
mov word [DETECTED_HARDWARE], ax
|
||
|
|
|
||
|
|
cli
|
||
|
|
xor ax, ax
|
||
|
|
mov ds, ax
|
||
|
|
mov es, ax
|
||
|
|
mov ss, ax
|
||
|
|
mov sp, 1000h
|
||
|
|
sti
|
||
|
|
|
||
|
|
mov ax, 3
|
||
|
|
int 10h
|
||
|
|
|
||
|
|
mov ax, 1301h
|
||
|
|
mov cx, 10
|
||
|
|
mov bp, loadingdb
|
||
|
|
xor dx, dx
|
||
|
|
mov bx, 7
|
||
|
|
int 10h
|
||
|
|
|
||
|
|
mov ah, 02h
|
||
|
|
; Number of sectors to load
|
||
|
|
; mov al, PROGRAM_LENGTH
|
||
|
|
mov al, 4
|
||
|
|
mov dl, [BOOT_DRIVE]
|
||
|
|
; Cylinder
|
||
|
|
mov ch, 0
|
||
|
|
; Head
|
||
|
|
mov dh, 0
|
||
|
|
; Start sector number
|
||
|
|
mov cl, 2
|
||
|
|
; Where load
|
||
|
|
mov bx, functable
|
||
|
|
int 13h
|
||
|
|
|
||
|
|
jc booterror
|
||
|
|
|
||
|
|
; call main
|
||
|
|
jmp secstage
|
||
|
|
|
||
|
|
; call dbg_halt_cpu
|
||
|
|
|
||
|
|
loadingdb db "Loading..."
|
||
|
|
|
||
|
|
; Print unsigned int
|
||
|
|
;
|
||
|
|
; AX - Num to convert
|
||
|
|
; SI - Where save string
|
||
|
|
; ---
|
||
|
|
; SI - Pointer to string with converted num
|
||
|
|
its:
|
||
|
|
push cx
|
||
|
|
push bx
|
||
|
|
push di
|
||
|
|
push ax
|
||
|
|
|
||
|
|
mov cx, 0
|
||
|
|
mov bx, 10
|
||
|
|
mov di, si
|
||
|
|
|
||
|
|
its.push:
|
||
|
|
mov dx, 0
|
||
|
|
div bx
|
||
|
|
inc cx
|
||
|
|
push dx
|
||
|
|
test ax, ax
|
||
|
|
jnz its.push
|
||
|
|
its.pop:
|
||
|
|
pop dx
|
||
|
|
add dl, '0'
|
||
|
|
push ax
|
||
|
|
mov ah, 0Eh
|
||
|
|
mov al, dl
|
||
|
|
int 10h
|
||
|
|
pop ax
|
||
|
|
inc di
|
||
|
|
dec cx
|
||
|
|
jnz its.pop
|
||
|
|
|
||
|
|
pop ax
|
||
|
|
pop di
|
||
|
|
pop bx
|
||
|
|
pop cx
|
||
|
|
ret
|
||
|
|
|
||
|
|
errcode db 0
|
||
|
|
booterror:
|
||
|
|
mov [errcode], ah
|
||
|
|
mov ax, 3
|
||
|
|
int 10h
|
||
|
|
mov ax, 1301h
|
||
|
|
mov bx, 7
|
||
|
|
xor dx, dx
|
||
|
|
mov cx, 13
|
||
|
|
mov bp, booterror.message
|
||
|
|
int 10h
|
||
|
|
xor ax, ax
|
||
|
|
mov al, [errcode]
|
||
|
|
call its
|
||
|
|
cli
|
||
|
|
hlt
|
||
|
|
|
||
|
|
booterror.message db "Error! Code: "
|
||
|
|
|
||
|
|
; times 507-($-$$) db 0
|
||
|
|
; MBR partition table starting at byte 446
|
||
|
|
times 443-($-$$) db 0
|
||
|
|
DETECTED_HARDWARE dw 0
|
||
|
|
BOOT_DRIVE db 0
|
||
|
|
|
||
|
|
; partition 1 (contains the kernel code)
|
||
|
|
boot_indicator: db 0x80 ; mark as bootable
|
||
|
|
starting_head: db 0x0
|
||
|
|
starting_sector: db 0x1 ; bits 5-0 for sector and bits 7-6 are upper bits of cylinder
|
||
|
|
starting_cylinder: db 0x0
|
||
|
|
system_id: db 0x7f ; just some ID that has not been used for anything else by standard
|
||
|
|
; the last sector of the partition should be 2880
|
||
|
|
ending_head: db 1 ; here I assume the maximum number of heads as 255
|
||
|
|
ending_sector: db 4
|
||
|
|
ending_cylinder: db 0x0
|
||
|
|
first_sector_lba: dd 0x1 ; first sector after the bootsector
|
||
|
|
total_sectors_in_partition: dd 21 ; 2880-1 because first sector is bootsector
|
||
|
|
|
||
|
|
; partitions 2-4 are unused and therefore set to 0
|
||
|
|
times 16 db 0
|
||
|
|
times 16 db 0
|
||
|
|
times 16 db 0
|
||
|
|
|
||
|
|
db 0x55, 0xAA
|
||
|
|
|
||
|
|
|
||
|
|
include 'functable.asm'
|
||
|
|
|
||
|
|
include 'filetable.asm'
|
||
|
|
|
||
|
|
include 'secstage.asm'
|
||
|
|
|
||
|
|
include 'kernel.asm'
|
||
|
|
|
||
|
|
include 'funcs.asm'
|
||
|
|
|
||
|
|
include 'data.asm'
|
||
|
|
|
||
|
|
VIDEO_MODE db 0
|
||
|
|
|
||
|
|
times 8192-($-$$) db 0
|
||
|
|
; times 8400h-($-$$) db 0
|
||
|
|
|
||
|
|
; include 'programs/calculator.asm'
|