| ;--------------------------------------------------------------------------␊ |
| ; Boot code is loaded at 0:7C00h.␊ |
| ;␊ |
| start␊ |
| start:␊ |
| ;␊ |
| ; Set up the stack to grow down from kBoot0Segment:kBoot0Stack.␊ |
| ; Interrupts should be off while the stack is being manipulated.␊ |
|
| ␊ |
| jmp .continue␊ |
| ␊ |
| .found␊ |
| .found:␊ |
| DebugChar('*')␊ |
| ␊ |
| ;␊ |
|
| jnc .exit␊ |
| loop .chs_loop␊ |
| ␊ |
| .exit␊ |
| .exit:␊ |
| DebugChar('R')␊ |
| pop cx␊ |
| ret␊ |
|
| ; Clobber list:␊ |
| ; AX, BX, SI␊ |
| ;␊ |
| print_string␊ |
| print_string:␊ |
| mov bx, 1 ; BH=0, BL=1 (blue)␊ |
| cld ; increment SI after each lodsb call␊ |
| .loop␊ |
| .loop:␊ |
| lodsb ; load a byte from DS:SI into AL␊ |
| cmp al, 0 ; Is it a NULL?␊ |
| je .exit ; yes, all done␊ |
| mov ah, 0xE ; INT10 Func 0xE␊ |
| int 0x10 ; display byte in tty mode␊ |
| jmp short .loop␊ |
| .exit␊ |
| .exit:␊ |
| ret␊ |
| ␊ |
| ␊ |
|
| ebios_lba dd 0 ; starting LBA of the intial extended partition.␊ |
| ebios_present db 0 ; 1 if EBIOS is supported, 0 otherwise.␊ |
| ␊ |
| pad_boot␊ |
| pad_boot:␊ |
| times 446-($-$$) db 0␊ |
| ␊ |
| pad_table_and_sig␊ |
| pad_table_and_sig:␊ |
| times 510-($-$$) db 0␊ |
| dw kBootSignature␊ |
| ␊ |
| END␊ |
| ;END␊ |
