diff options
Diffstat (limited to 'src/boot/boot.stage1.asm')
| -rw-r--r-- | src/boot/boot.stage1.asm | 50 |
1 files changed, 34 insertions, 16 deletions
diff --git a/src/boot/boot.stage1.asm b/src/boot/boot.stage1.asm index 801860e..5fa3b7a 100644 --- a/src/boot/boot.stage1.asm +++ b/src/boot/boot.stage1.asm @@ -1,11 +1,11 @@ ;; boot.stage1.asm - %include "boot.common.asm" - %include "boot.stage1.print.asm" [org 0x7c00] [bits 16] - %define READ_SECTORS_NUM 64 + %include "boot.common.asm" + + %define READ_SECTORS_NUM 1 %define BOOT_LOAD_ADDR 0x7c00 %define SECTOR_SIZE 512 @@ -26,9 +26,10 @@ _start: clc + mov [drive], dl mov si, disk_addr_packet mov ah, 0x42 ; BIOS extended read function - mov dl, 0x80 ; Drive number + mov dl, [drive] ; Drive number int 0x13 ; BIOS disk services jc _disk_read_err @@ -44,21 +45,38 @@ _disk_read_err: hlt jmp _disk_read_err +_print_string: + pusha + mov ah, 0x0e + mov bh, 0x00 + +.print_loop: + lodsb + test al, al + je .print_return + int 0x10 + jmp .print_loop + +.print_return: + popa + ret + _end: - hlt - jmp _end + hlt + jmp _end +drive: db 0 disk_read_err_msg: db "Failed to read disk", 13, 10, 0 disk_read_success_msg: db "Read the disk successfully", 13, 10, 0 disk_addr_packet: - db 0x10 - db 0x00 - dw READ_SECTORS_NUM - dw 0x0000 - dw 0x7e00 - dq 1 + db 0x10 + db 0x00 + dw READ_SECTORS_NUM + dw 0x7e00 + dw 0x0000 + dq 1 - ;; Padding and magic number - times 510 - ($ - $$) db 0 - dw 0xaa55 - + ;; Padding and magic number + times 510 - ($ - $$) db 0 + dw 0xaa55 + |