Load stage2 from boot drive rather than fixed hard disk

diff --git a/stage1/boot.asm b/stage1/boot.asm
index 2e995a0ace3c99056300eb5a9b9590d6c5023854..6144c2acabe828915e12ad434883445b9673680b 100644 (file)
--- a/stage1/boot.asm
+++ b/stage1/boot.asm
@@ -13,10 +13,12 @@ mov ss, ax
 
 ; Initialize the stack
 ; It grows down, overwriting this code
-; I have no idea what this does exactly
+; I have no idea what this does exactly (note by Lizzy: bp is base pointer, sp is stack pointer)
 mov bp, STAGE2START
 mov sp, bp
 
+push dx ; Save boot drive (will be restored when making the int 0x13 ah=0x02 call)
+
 jmp boot
 
 ; Print al register
@@ -78,8 +80,8 @@ boot:
        mov al, STAGE2SECTORS ; Stage 2 size in sectors
        xor ch, ch            ; Cylinder 0
        mov cl, 2             ; Second sector, they start at 1
+       pop dx                ; Restore boot drive
        xor dh, dh            ; Head 0
-       mov dl, 0x80          ; Hard Drive 1
        mov bx, STAGE2START   ; Memory address to load stage 2 into
        int 0x13