X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=kern%2Fsrc%2Fboot.asm;fp=kern%2Fsrc%2Fboot.asm;h=25486e63f4fbdd8a386d8508cbaf4a4b623aafe0;hb=88e57cf7f2581900eb31cb835a18ad414e37786c;hp=5be618b007a57f605d1095f24bd8b647d8bd45f7;hpb=5145ed1e2adefc9c66e20681532a3a7cd6c2de01;p=eightysix

diff --git a/kern/src/boot.asm b/kern/src/boot.asm
index 5be618b..25486e6 100644
--- a/kern/src/boot.asm
+++ b/kern/src/boot.asm
@@ -3,18 +3,19 @@
 	bits 16
 	section .bootsect
 
+extern _bootsect_start
 extern _kern_start_seg
 extern _kern_size
 
-boot_driveno	equ 7b00h
-num_read_tries	equ 7b06h	; 2 bytes
-sect_pending	equ 7b08h	; 2 bytes
-sect_per_track	equ 7b0ah	; 2 bytes
-cur_head	equ 7b0ch	; 2 bytes - current head
-start_sect	equ 7b0eh	; 2 bytes - start sector in track
-destptr		equ 7b10h	; 2 bytes - destination pointer
-num_heads	equ 7b12h	; 2 bytes - number of heads
-cur_cyl		equ 7b14h	; 2 bytes - current cylinder
+boot_driveno	equ 0500h
+num_read_tries	equ 0506h	; 2 bytes
+sect_pending	equ 0508h	; 2 bytes
+sect_per_track	equ 050ah	; 2 bytes
+cur_head	equ 050ch	; 2 bytes - current head
+start_sect	equ 050eh	; 2 bytes - start sector in track
+destptr		equ 0510h	; 2 bytes - destination pointer
+num_heads	equ 0512h	; 2 bytes - number of heads
+cur_cyl		equ 0514h	; 2 bytes - current cylinder
 
 %macro floppy_motor_off 0
 	pushf
@@ -66,10 +67,17 @@ start:
 	mov ds, ax
 	mov es, ax
 	mov ss, ax
+	mov [boot_driveno], dl	; save boot drive number
+
+	; relocate boot sector to 600h
+	mov si, 0x7c00
+	mov di, _bootsect_start
+	mov cx, 256
+	rep movsw
+
 	jmp 00:.setcs
 .setcs:
-	mov sp, 0x7b00	; temp stack below our vars
-	mov [boot_driveno], dl
+	mov sp, _bootsect_start	; temp stack below our relocated address
 
 	; query sectors per track
 	mov ah, 8	; get drive parameters call, dl already has the drive