cpu 8086
	org 0x0000

	; interrupt vector we store addr of data segment in
bssvec:	equ 0xB6

	db 0x55, 0xAA
	db 0x00
	jmp near init

	times (0x18 - ($-$$)) db 0
	dw 0
	dw pnp

pnp:	db "$PnP"
	db 1 ; version 1
	db 2 ; 2 * 16 length
	dw 0 ; offset of next header
	db 0
	db 0 ; checksum (filled by fix-rom)
	dd 0 ; device identifier
	dw 0 ; manufacturer string
	dw name ; product name string
	db 0,0,0 ; device type string
	db 0x20 ; device indicator, bit for "read cacheable" set
	dw 0 ; boot connection vector
	dw 0 ; boot disconnect vector
	dw 0 ; bootstrap entry point
	dw 0 ; reserved
zero:	dw 0

name:	db "rdos debug", 0

init:	push ds
	push ax
	push cx

	; DS := 0
	xor ax, ax
	mov ds, ax
	; allocate a single kilobyte from end of lowmem
	dec word [0x413]
	; calculate segment from kilobytes
	mov ax, [0x413]
	mov cl, 6
	shl ax, cl
	; store ptr to our data segment in B6h vector
	mov word [bssvec*4], ax
	; set entry points vectors
	mov word [1*4], int3entry
	mov word [1*4+2], cs
	mov word [3*4], int3entry
	mov word [3*4+2], cs

	pop cx
	pop ax
	pop ds
	retf

	; Expects DI to mark end of command
runcmd:	mov si, inbuf
	lodsb
	cmp al, 'G'
	je cmd_g
	cmp al, 'H'
	je cmd_h
	cmp al, 'R'
	je cmd_r
	cmp al, 'T'
	je cmd_t
	cmp al, '?'
	je cmd_?
cerr:	mov al, '?'
	call putc
	jmp crlf

	%include "debug/chario.asm"
	%include "debug/parse.asm"
	%include "debug/names.asm"

	%include "debug/edit.asm"
	%include "debug/run.asm"
	%include "debug/util.asm"
	%include "debug/asm.asm"

	align 512

absolute 0
reg_ax:	resw 1
reg_cx:	resw 1
reg_dx:	resw 1
reg_bx:	resw 1
reg_sp:	resw 1
reg_bp:	resw 1
reg_si:	resw 1
reg_di:	resw 1

reg_es:	resw 1
reg_cs:	resw 1
reg_ss:	resw 1
reg_ds:	resw 1

reg_ip:	resw 1
reg_fl:	resw 1

ingetc:	resw 1
inmin:	resb 1
inmax:	resb 1
inbuf:  resb 0x20

	; reserve at least 80h words for stack
	resw 0x80
	alignb 1024
stack: