Relocate kernel to 0x01000 per convention

boot/floppy.asm

@@ -44,26 +44,16 @@ fdc:		; FDC Descriptor as per ECMA-107
   times (62 - ($-$$)) db " "
 
 _startup:
-  mov ax, 0x1050
-  ; setup relocated stack area
+  xor ax, ax
+  ; setup stack area growing down from 0x10000
   mov ss, ax
-  xor sp, sp
+  mov sp, ax
   ; backup important values
   push bx
   push cx
   push dx
-  ; setup relocated code area
-  mov es, ax
-  mov di, 0x0000
-  ; setup start code area
-  xor ax, ax
-  mov ds, ax
-  mov si, 0x7C00
-  ; relocate 256 words
-  mov cx, 0x0100
-  rep movsw
   ; adjust CS
-  jmp 0x1050:main
+  jmp 0x07C0:main
 
 ; non-fdc variables
 rootdir:
@@ -73,8 +63,8 @@ rootdir:
   dw 0
 
 main:
-  ; setup buffer area directly after the BDA
-  mov ax, 0x0050
+  ; setup buffer area directly at 4k
+  mov ax, 0x0100
   mov ds, ax
   mov es, ax
 
@@ -94,7 +84,7 @@ main:
   pop dx
   pop cx
   pop bx
-  jmp 0x0050:0000
+  jmp 0x0100:0000
 
 ; Write AX, a string and bail out
 ; Return pointer is the string start