%if 0

 2019, by C. Masloch

Usage of the works is permitted provided that this
instrument is retained with the works, so that any entity
that uses the works is notified of this instrument.

DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.

%endif


%include "lmacros3.mac"

	defaulting
	sectalign off

	numdef SPI, (1024 * 1024 * 1024 * 1024 * 4 / 512)
				; sectors per image
	numdef CHS_SECTORS, 63	; CHS geometry field for sectors
	numdef CHS_HEADS, 255	; CHS geometry field for heads

	numdef MBR,			1
	numdef MBR_DOSEMU_IMAGE_HEADER,	1


	struc DOSEMU_IMAGE_HEADER
; This structure is parsed when determining the geometry for
;  a hard disk image. It is documented in the dosemu2 sources at:
; https://github.com/dosemu2/dosemu2/blob/f41c0f267fec/src/include/disks.h#L132
dihSig:		resb 7		; "DOSEMU",0 or 0Eh,"DEXE"
dihCHSHeads:	resd 1		; (note the misalignment for these)
dihCHSSectors:	resd 1
dihCHSCylinders:resd 1
dihHeaderSize:	resd 1
dihDummy:	resb 1
dihDEXEFlags:	resd 1
	endstruc
dih_our_size:	equ 8192	; (16 * 512)


%define STARTSFOLLOWS start=0

%if _MBR
CYLINDERS equ (_SPI) \
	/ (_CHS_HEADS * _CHS_SECTORS)


 %if _MBR_DOSEMU_IMAGE_HEADER
	addsection dosemu_image_header, STARTSFOLLOWS
  %define STARTSFOLLOWS follows=dosemu_image_header
	istruc DOSEMU_IMAGE_HEADER
at dihSig,		asciz "DOSEMU"
at dihCHSHeads,		dd _CHS_HEADS
at dihCHSSectors,	dd _CHS_SECTORS
at dihCHSCylinders,	dd CYLINDERS
at dihHeaderSize,	dd dih_our_size
	iend
	times dih_our_size - ($ - $$) db 0
 %endif

%endif