Adjust CS at startup and HLT-loop after main

main.asm

@@ -1,16 +1,42 @@
+; assumptions about the starting envionment
 cpu 8086
+org 0x0000 ;	if we are not at CS:0000, CS adjustment will fix it for us
+; dl		probable drive number
+; ds:si		probable pointer to partition structure
+; es:bx		probable pxeenv+ structure
+; ss:sp		functional stack
 
-org 0x0100
-jmp main
+; during PXE, CS=0000 and IP=7C00
+; adjust CS so our offsets match org setting above
+push bx ; offset register for calculations
+call near __startup_push_ip ; push ip
+__startup_push_ip:
+pop bx
+sub bx, __startup_push_ip ; subtract expected value ...
+shr bx,1 ; shift it to 4 bits to the right
+shr bx,1
+shr bx,1
+shr bx,1
+mov ax,cs
+add ax,bx ; so we can add it to cs
+pop bx
+push ax ; cs
+mov ax, main
+push ax ; ip
+retf ; jump
 
-str1:
-  db "Hello!", 0
+string_halt:
+  db "Halted: Waiting for poweroff...", 0
 
 main:
+  call dumpreg
   mov ax,cs
   mov ds,ax
-  mov si,str1
+  mov si, string_halt
   call kprintf
-  ret
+.loop:
+  hlt
+  jmp .loop
 
+%include "dumpreg.asm"
 %include "kprintf.asm"