diff options
Diffstat (limited to 'bootloader.asm')
| -rw-r--r-- | bootloader.asm | 42 |
1 files changed, 1 insertions, 41 deletions
diff --git a/bootloader.asm b/bootloader.asm index 40bf2b6..bf3afb4 100644 --- a/bootloader.asm +++ b/bootloader.asm @@ -27,40 +27,10 @@ step2: ; Intel implements a full descending stack sti ; Enable interrupts - - mov si, load_msg - call print - - ; Load sector from disk - - mov ah, 2 ; Read sector into memory - mov al, 1 ; Read 1 sector - - mov ch, 0 ; Cylinder number - mov cl, 2 ; Sector number to start reading from - - mov dh, 0 ; Head number - ;DL ; Drive number (Already set by bios) - - ; Sector will be loaded at ES:BX. We already have ES set, - ; just set the BX to an address after the end of the bootloader. This - ; avoids the risk of corrupting any data from our bootloader. - mov bx, kbuf_sector - int 0x13 - - ; Jump if CF is set - jc kload_failure ; On I/O error, CF is set - - ; Kernel loaded succesfully (hopefully) - mov si, kbuf_sector - call print jmp $ -kload_failure: - mov si, err_msg - call print - jmp $ +; Message Print routines print: mov bx, 0 .loop @@ -77,16 +47,6 @@ print_char: int 0x10 ret - -; Static data - load_msg: db 'Starting bootloader...', 0x0A, 0x0D, 0 - divzero_msg: db 'Interrupts working properly...', 0x0A, 0x0D, 0 - err_msg: db 'Failed to load kernel...', 0x0A, 0x0D, 0 - ; Fill in to the end and add bootloader signature times 510 - ($ - $$) db 0 dw 0xAA55 - -; This just labels an address after the bootloader. Just makes it easier -; to refer to the loaded sector from int 0x13. -kbuf_sector: |