gfxboot: remove 16-bit gfxboot module

Get rid of the 16-bit gfxboot module; use gfxboot.c32 instead.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 1 insertions, 1085 deletions

diff --git a/modules/Makefile b/modules/Makefile
index 77020ea0..f3183641 100644
--- a/modules/Makefile
+++ b/modules/Makefile
@@ -19,7 +19,7 @@ include $(topdir)/MCONFIG.embedded
 
 INCLUDES   = -I$(com32)/include
 
-BINS = pxechain.com gfxboot.com poweroff.com int18.com
+BINS = pxechain.com poweroff.com int18.com
 
 all: $(BINS)
 
diff --git a/modules/gfxboot.asm b/modules/gfxboot.asm
deleted file mode 100644
index 5c7b118b..00000000
--- a/modules/gfxboot.asm
+++ /dev/null
@@ -1,1084 +0,0 @@
-; ****************************************************************************
-;
-;  gfxboot.asm
-;
-;   Copyright 2008-2009 Sebastian Herbszt
-;
-;  This module is based on the gfxboot integration patch by Steffen Winterfeldt:
-;
-;   Copyright 2001-2008 Steffen Winterfeldt
-;
-;  Some parts borrowed from Syslinux core:
-;
-;   Copyright 1994-2009 H. Peter Anvin - All Rights Reserved
-;
-;  This program is free software; you can redistribute it and/or modify
-;  it under the terms of the GNU General Public License as published by
-;  the Free Software Foundation, Inc., 53 Temple Place Ste 330,
-;  Boston MA 02111-1307, USA; either version 2 of the License, or
-;  (at your option) any later version; incorporated herein by reference.
-;
-; ****************************************************************************
-
-		[map all gfxboot.map]
-
-		absolute 0
-pspInt20:	resw 1
-pspNextP:	resw 1
-		resb 124
-pspCmdLen:	resb 1
-pspCmdArg:	resb 127
-
-;%define DEBUG
-
-		section .text
-		org 100h
-
-_start:
-		; Zero memory from the start of .bss to the stack
-		cld
-		mov di,section..bss.start
-		mov cx,sp
-		sub cx,di
-		shr cx,2
-		xor eax,eax
-		rep stosd
-
-		mov ax,2
-		mov bx, msg_progname
-		int 22h
-
-		mov ax,2
-		mov bx, msg_crlf
-		int 22h
-
-		push es
-		mov ax,0ah
-		mov cl,9
-		int 22h
-		pop es
-		cmp al,32h
-		jnz not_pxelinux
-
-		mov dl,0 ; fake drive number
-		mov cl,11 ; fake sector size 2048 bytes
-
-not_pxelinux:
-		mov [derivative_id],al
-		mov [drivenumber],dl
-		mov [sectorshift],cl
-		mov ax,1
-		shl ax,cl
-		mov [sectorsize],ax
-		mov ax,trackbufsize
-		shr ax,cl
-		mov [BufSafe],ax
-
-		xor cx,cx
-		mov cl,[pspCmdLen]
-		dec cx
-		and cx,cx
-		jne continue
-
-		mov ax,2
-		mov bx, msg_usage
-		int 22h
-		ret
-continue:
-		mov di,pspCmdArg+1
-		add di,cx
-		dec di
-		std
-		mov al,' '
-		repe scasb
-		inc cx
-		cld
-		mov [pspCmdLen],cl
-		mov si,pspCmdArg+1
-		mov di,si
-		add di,cx
-		xor al,al
-		stosb
-		mov si,pspCmdArg+1
-
-; get config file name
-		mov ax,0eh
-		int 22h
-
-; open config file
-		mov si,bx ; es:bx config file name
-		mov ax,6
-		int 22h
-		jc no_config_file
-		and eax,eax
-		jz no_config_file
-		jmp got_config_file
-no_config_file:
-		push es
-		push bx
-		push cs
-		pop es
-		mov bx, msg_config_file
-		mov ax,2
-		int 22h
-		mov bx, msg_space
-		mov ax,2
-		int 22h
-		pop bx
-		pop es
-		mov ax,2
-		int 22h
-		push cs
-		pop es
-		mov bx, msg_space
-		mov ax,2
-		int 22h
-		mov bx, msg_missing
-		mov ax,2
-		int 22h
-		mov ax,2
-		mov bx, msg_crlf
-		int 22h
-		ret
-got_config_file:
-		push cs
-		pop es
-		call parse_config
-		cmp word [label_cnt],0
-		ja labels_defined
-
-		mov bx,msg_no_labels_defined
-		mov ax,2
-		int 22h
-		ret
-
-labels_defined:
-; get_gfx_file
-		mov ax,cs
-		add ax,2000h
-		mov word [gfx_mem_start_seg],ax
-		mov ax,[pspNextP]
-		mov word [gfx_mem_end_seg],ax
-
-		call gfx_init
-		jc error
-
-		call gfx_setup_menu
-		jc exit
-
-input:
-		call gfx_input
-		jc exit
-
-		cmp eax,1
-		jz exit
-
-		cmp eax,2
-		jz boot
-
-		jmp input
-
-boot:
-		call far [gfx_bc_done]
-		mov ax,cs
-		mov es,ax
-		mov bx,command_line
-		mov ax,3
-		int 22h
-exit:
-		call far [gfx_bc_done]
-error:
-		ret
-
-cb_table	dw cb_status		; 0
-		dw cb_fopen		; 1
-		dw cb_fread		; 2
-		dw cb_getcwd		; 3
-		dw cb_chdir		; 4
-		dw cb_readsector	; 5
-cb_len		equ ($-cb_table)/2
-
-gfx_cb:
-		push cs
-		pop ds
-
-		cmp al,cb_len
-		jae gfx_cb_error
-
-		movzx bx,al
-		add bx,bx
-		call word [bx+cb_table]
-		jmp gfx_cb_end
-gfx_cb_error:
-		mov al,0ffh
-gfx_cb_end:
-		retf
-
-; Return status info
-;
-; return:
-;  edx		filename buffer (64 bytes)
-;
-cb_status:
-		mov edx,cs
-		shl edx,4
-		add edx,fname_buf
-
-		xor al,al
-		ret
-
-; Open file
-;
-; return:
-;    al		0: ok, 1: file not found
-;   ecx		file length (al = 0)
-;
-cb_fopen:
-		push ds
-		pop es
-		mov ax,6
-		mov si,fname_buf
-		int 22h
-		jnc cb_fopen_ok
-cb_fopen_failed:
-		mov al,1
-		jmp cb_fopen_end
-cb_fopen_ok:
-		mov ecx,eax
-		mov [f_handle],si
-		mov [f_size],ecx
-		xor al,al
-cb_fopen_end:
-		ret
-
-; Read next chunk
-;
-; return:
-;   edx		buffer address (linear)
-;   ecx		data length (< 64k)
-;
-cb_fread:
-		cmp dword [f_size],0
-		jz cb_fread_eof
-		push ds
-		pop es
-		mov ax,7
-		mov si,[f_handle]
-		mov bx,trackbuf
-		mov cx,[BufSafe]
-		int 22h
-		mov al,1
-		jc cb_fread_end
-		sub [f_size], ecx
-		or si,si
-		jnz cb_fread_noeof
-		and dword [f_size],0
-cb_fread_noeof:
-		mov edx,cs
-		shl edx,4
-		add edx,trackbuf
-		jmp cb_fread_ok
-cb_fread_eof:
-		xor ecx,ecx
-cb_fread_ok:
-		xor al,al
-cb_fread_end:
-		ret
-
-; Return current working directory
-;
-; return:
-;  edx		filename
-;
-cb_getcwd:
-		mov edx,cs
-		shl edx,4
-		add edx,gfx_slash
-		xor al,al
-		ret
-
-; Set current working directory
-;
-cb_chdir:
-		xor al,al
-		ret
-
-; Read sector
-;
-;   edx		sector
-;
-; return:
-;  edx		buffer (linear address)
-;
-;  Note: does not return on error!
-;
-cb_readsector:
-		push esi
-		push edi
-		push ds
-		pop es
-		mov ax,19h
-		xor esi,esi
-		xor edi,edi
-		mov cx,1
-		mov bx,trackbuf
-		int 22h
-		pop edi
-		pop esi
-		mov al,1
-		jc cb_readsector_end
-		mov edx,ds
-		shl dx,4
-		add edx,trackbuf
-		xor al,al
-cb_readsector_end:
-		ret
-
-gfx_init:
-		mov ax,0e801h
-		xor bx,bx
-		xor cx,cx
-		xor dx,dx
-		int 15h
-		jnc got_e801
-
-		mov ax,2
-		mov bx, msg_memory
-		int 22h
-		stc
-		ret
-
-got_e801:
-		cmp ax,3c00h
-		jb mem_below_16mb
-		shl ebx,6
-		add eax,ebx
-
-mem_below_16mb:
-		shl eax,10
-		mov [gfx_bios_mem_size],eax
-		shr eax,20
-		cmp ax,16
-		jb skip_extended
-
-		mov word [gfx_xmem_0],88h       ; 8MB at 8MB
-		mov dword [gfx_save_area1],7f0000h      ; 8MB-64k
-
-skip_extended:
-		movzx ebx,word [gfx_mem_start_seg]
-		shl ebx,4
-
-		movzx ecx,word [gfx_mem_end_seg]
-		shl ecx,4
-
-		mov dword [gfx_mem],ebx
-		mov dword [gfx_mem0_start],ebx
-		mov dword [gfx_mem0_end],ecx
-
-		call gfx_read_file
-		jc gfx_init_end
-
-		call gfx_get_sysconfig
-
-		; align 4
-		mov eax,[gfx_mem0_start]
-		add eax,3
-		and eax,~3
-		mov [gfx_mem0_start],eax
-
-; setup jump table
-		les bx,[gfx_bc_jt]
-
-		mov ax,[es:bx]
-		mov [gfx_bc_init],ax
-		mov [gfx_bc_init+2],es
-
-		mov ax,[es:bx+2]
-		mov [gfx_bc_done],ax
-		mov [gfx_bc_done+2],es
-
-		mov ax,[es:bx+4]
-		mov [gfx_bc_input],ax
-		mov [gfx_bc_input+2],es
-
-		mov ax,[es:bx+6]
-		mov [gfx_bc_menu_init],ax
-		mov [gfx_bc_menu_init+2],es
-
-; ...
-
-		mov esi,cs
-		shl esi,4
-		add esi,gfx_sysconfig
-		call far [gfx_bc_init]
-
-gfx_init_end:
-		ret
-
-gfx_read_file:
-; open file
-; es:si - file name
-
-		push cs
-		pop es
-		mov ax,6
-		mov si,pspCmdArg+1
-		int 22h
-		jnc gfx_file_read
-
-		mov ax,2
-		mov bx,pspCmdArg+1
-		int 22h
-
-		mov ax,2
-		mov bx,msg_not_found
-		int 22h
-		stc
-		ret
-
-gfx_file_read:
-; si - file handle
-; eax - length of file in bytes, or -1
-; cx - file block size
-
-		mov edx,[gfx_mem0_end]
-		sub edx,[gfx_mem0_start]
-		sub edx,0fh		; space to allow for aligning later
-		; edx: max allowed size
-
-		cmp eax,-1		; unknown file size -> set to max allowed size
-		jnz .has_size
-		mov eax,edx
-.has_size:
-		cmp eax,edx
-		jbe read_bootlogo
-
-gfx_file_too_big:
-		mov ax,2
-		mov bx,msg_bootlogo_toobig
-		int 22h
-		stc
-		ret
-
-read_bootlogo:
-		mov [file_length],eax
-		mov edi,[gfx_mem]
-
-; read file
-; si - file handle
-; es:bx - buffer
-; cx - number of blocks to read
-
-read:
-		push eax
-		mov ax,7
-		mov bx,trackbuf
-		mov cx,[BufSafe]
-		int 22h
-
-		push edi
-		push ecx
-		push si
-		push es
-
-		mov si,trackbuf
-		push edi
-		call gfx_l2so
-		pop di
-		pop es
-
-		rep movsb ; move ds:si -> es:di, length ecx
-		pop es
-		pop si
-		pop ecx
-		pop edi
-
-		pop eax
-
-		; si == 0: EOF
-		or si,si
-		jz gfx_read_done
-		add edi,ecx
-		sub eax,ecx
-		ja read
-		jmp gfx_file_too_big
-gfx_read_done:
-		sub eax,ecx
-		mov edx,[file_length]
-		sub edx,eax
-		; edx = real file size
-		mov [gfx_archive_end],edx
-		add edx,[gfx_mem0_start]
-		add edx,0fh		; for alignment
-		mov [gfx_mem0_start],edx
-
-bootlogo_read_done:
-		call find_file
-		or eax,eax
-		jnz found_bootlogo
-		stc
-		ret
-
-found_bootlogo:
-		push edi
-		push eax
-		add eax,edi
-		push dword [gfx_mem]
-		pop dword [gfx_archive_start]
-		neg al
-		and eax,byte 0fh
-		jz no_align
-		add [gfx_archive_start],eax
-
-no_align:
-		pop eax
-		pop edi
-		sub edi,[gfx_mem]
-		mov ecx,[gfx_archive_start]
-		add edi,ecx
-		mov [gfx_file],edi
-		add [gfx_archive_end],ecx
-		add eax,edi
-		shr eax,4
-		mov [gfx_bc_jt+2],ax
-		ret
-
-gfx_get_sysconfig:
-		mov ah,0
-		cmp byte [derivative_id],33h
-		jnz not_isolinux
-		mov ah,2
-not_isolinux:
-		mov al,[drivenumber]
-		mov [gfx_boot_drive],al
-		cmp al,80h	; floppy ?
-		jae not_floppy
-		mov ah,1
-not_floppy:
-		mov byte [gfx_media_type],ah
-		mov ah,[sectorshift]
-		mov byte [gfx_sector_shift],ah
-		mov ax,cs
-		mov [gfx_bootloader_seg],ax
-		ret
-
-gfx_setup_menu:
-		push es
-		push ds
-		pop es
-
-		mov word [menu_desc+menu_ent_list],0
-		mov di,[menu_seg]
-		mov [menu_desc+menu_ent_list+2],di
-
-		mov word [menu_desc+menu_default],dentry_buf
-		mov [menu_desc+menu_default+2],cs
-
-		mov di,256
-		mov [menu_desc+menu_arg_list],di
-		mov di,[menu_seg]
-		mov [menu_desc+menu_arg_list+2],di
-
-		mov cx,[label_cnt]
-		mov [menu_desc+menu_entries],cx
-
-		mov cx,256*2
-		mov [menu_desc+menu_ent_size],cx
-		mov [menu_desc+menu_arg_size],cx
-
-		mov esi,ds
-		shl esi,4
-		add esi,menu_desc
-
-		call far [gfx_bc_menu_init]
-		pop es
-		ret
-
-magic_ok:
-		xor eax,eax
-		cmp dword [es:bx],0b2d97f00h    ; header.magic_id
-		jnz magic_ok_end
-		cmp byte [es:bx+4],8            ; header.version
-		jnz magic_ok_end
-		mov eax,[es:bx+8]
-magic_ok_end:
-		ret
-
-find_file:
-		mov edi,[gfx_mem]
-		push edi
-		call gfx_l2so
-		pop bx
-		pop es
-		call magic_ok
-		or eax,eax
-		jnz find_file_end
-
-find_file_loop:
-		mov ecx,[gfx_mem0_start]
-		sub ecx,26 + 12                 ; min cpio header + gfx header
-		cmp edi,ecx
-		jae find_file_end
-		push edi
-		call gfx_l2so
-		pop bx
-		pop es
-		cmp word [es:bx],71c7h
-		jnz find_file_end
-		mov ax,[es:bx+20]               ; file name size
-		movzx esi,ax
-
-		inc si
-		and si,~1                       ; align
-
-		mov eax,[es:bx+22]              ; data size
-		rol eax,16                      ; get word order right
-		mov ecx,eax
-
-		inc ecx
-		and ecx,byte ~1                 ; align
-
-		add si,26                       ; skip header
-
-		add edi,esi
-		add bx,si
-		call magic_ok
-		or eax,eax
-		jnz find_file_end
-
-		add edi,ecx
-		jmp find_file_loop
-
-find_file_end:
-		ret
-
-gfx_input:
-		mov edi,cs
-		shl edi,4
-		add edi, command_line ; buffer (0: no buffer)
-		mov ecx, max_cmd_len ; buffer size
-		mov eax,[menu_timeout] ; timeout value (0: no timeout)
-
-		call far [gfx_bc_input]
-		ret
-
-gfx_l2so:
-		push eax
-		mov eax,[esp + 6]
-		shr eax,4
-		mov [esp + 8],ax
-		and word [esp + 6],byte 0fh
-		pop eax
-		ret
-
-parse_config:
-		mov [f_handle],si
-		push es
-		mov ax,cs
-		add ax,1000h
-		mov es,ax
-		mov word [menu_seg],ax
-		xor eax,eax
-		mov cx,4000h
-		mov di,0
-		rep stosd
-		pop es
-.read:
-		call skipspace
-		jz .eof
-		jc .read
-		cmp al,'#'
-		je .nextline
-		or al,20h ; convert to lower case
-		mov di,configbuf
-		stosb
-.read_loop:
-		call getc
-		jc .eof
-		cmp al,' '
-		jbe .done
-		or al,20h ; convert to lower case
-		stosb
-		jmp .read_loop
-.done:
-		call ungetc
-
-		xor ax,ax
-		stosb
-%ifdef DEBUG
-		mov ax,2
-		mov bx, configbuf
-		int 22h
-
-		mov ax,2
-		mov bx, msg_crlf
-		int 22h
-%endif
-		mov bx,keywords
-		mov cx,[keyword_cnt]
-.keywords_loop:
-		push cx
-		push si
-		push di
-		xor cx,cx
-		mov si,configbuf
-		mov di,[bx]
-		mov cl,byte [di]
-		inc di
-		call memcmp
-		pop di
-		pop si
-		jnz .not_found
-		pop cx
-		call [bx+2] ; call keyword handler
-		jmp .read
-
-.not_found:
-		add bx,4
-		pop cx
-		loop .keywords_loop
-
-.nextline:
-		call skipline
-		jmp .read
-
-.eof:
-.noparm:
-		ret
-
-do_label:
-		call skipspace
-		jz .eof
-		jc .noparm
-		call ungetc
-		push es
-		push di
-		mov ax,[menu_seg]
-		mov es,ax
-		mov di,[menu_off]
-		call getline
-		mov di,[menu_off]
-		add di,512
-		mov [menu_off],di
-		pop di
-		pop es
-		inc word [label_cnt]
-.eof:
-.noparm:
-		ret
-
-do_default:
-		call skipspace
-		jz .eof
-		jc .noparm
-		call ungetc
-		push es
-		push di
-		push cs
-		pop es
-		mov di,dentry_buf
-		call getline
-		pop di
-		pop es
-
-.eof:
-.noparm:
-		ret
-
-do_timeout:
-		call skipspace
-		jz .eof
-		jc .noparm
-		call ungetc
-		push es
-		push di
-		push cs
-		pop es
-		mov di,NumBuf
-.getnum:
-		cmp di,NumBufEnd
-		jae .loaded
-		call getc
-		stosb
-		cmp al,'-'
-		jnb .getnum
-		call ungetc
-		dec di
-.loaded:
-		mov byte [di],0
-		pop di
-		pop es
-		push cs
-		pop ds
-		mov si,NumBuf
-		push ebx
-		call parseint
-		jc .err
-		mov [menu_timeout],ebx
-.err:
-		pop ebx
-.eof:
-.noparm:
-		ret
-
-skipline:
-		cmp al,10
-		je .end
-		call getc
-		jc .end
-		jmp skipline
-.end:
-		ret
-
-skipspace:
-.loop:
-		call getc
-		jc .eof
-		cmp al,0Ah
-		je .eoln
-		cmp al,' '
-		jbe .loop
-		ret
-.eof:
-		cmp al,al
-		stc
-		ret
-.eoln:
-		add al,0FFh
-		ret
-
-ungetc:
-		mov byte [ungetc_cnt],1
-		mov byte [ungetcdata],al
-		ret
-
-getc:
-		cmp byte [ungetc_cnt],1
-		jne .noungetc
-		mov byte [ungetc_cnt],0
-		mov al,[ungetcdata]
-		clc
-		ret
-.noungetc:
-		sub word [bufbytes],1
-		jc .get_data
-		mov si,trackbuf
-		add si,[bufdata]
-		mov al,[si]
-		inc word [bufdata]
-		clc
-		ret
-.get_data:
-		mov si,[f_handle]
-		and si,si
-		jz .empty
-		mov ax,7
-		mov bx,trackbuf
-		mov cx,[BufSafe]
-		int 22h
-		mov word [bufdata],0
-		jc .empty
-		mov [f_handle],si
-		mov [bufbytes],cx
-		jmp getc
-.empty:
-		mov word [f_handle],0
-		mov word [bufbytes],0
-		stc
-		ret
-
-getline:
-		call skipspace
-		jz .eof
-		jc .eoln
-		call ungetc
-.loop:
-		call getc
-		jc .ret
-		cmp al,' '
-		jna .ctrl
-.store:
-		stosb
-		jmp .loop
-.ctrl:
-		cmp al,10
-		je .ret
-		mov al,' '
-		jmp .store
-.eoln:
-		clc
-		jmp .ret
-.eof:
-		stc
-.ret:
-		xor al,al
-		stosb
-		ret
-
-
-memcmp:
-		push si
-		push di
-		push ax
-.loop:
-		mov al,[si]
-		mov ah,[di]
-		inc si
-		inc di
-		cmp al,ah
-		loope .loop
-		pop ax
-		pop di
-		pop si
-		ret
-
-parseint:
-		push eax
-		push ecx
-		xor eax,eax
-		xor ebx,ebx
-		xor ecx,ecx
-		mov cl,10
-.loop:
-		lodsb
-		and al,al
-		jz .done
-		cmp al,'0'
-		jb .err
-		cmp al,'9'
-		ja .err
-		sub al,'0'
-		imul ebx,ecx
-		add ebx,eax
-		jmp short .loop
-.done:
-		clc
-.ret:
-		pop ecx
-		pop eax
-		ret
-.err:
-		stc
-		jmp short .ret
-
-		section .data
-msg_progname		db 'gfxboot: ',0
-msg_config_file		db 'Configuration file',0
-msg_missing		db 'missing',0
-msg_usage		db 'Usage: gfxboot.com <bootlogo>',0dh,0ah,0
-msg_memory		db 'Could not detect available memory size',0dh,0ah,0
-msg_bootlogo_toobig	db 'bootlogo file too big',0dh,0ah,0
-msg_unknown_file_size	db 'unknown file size',0dh,0ah,0
-msg_not_found		db ' not found',0dh,0ah,0
-msg_no_labels_defined	db 'No labels defined in config file',0dh,0ah,0
-msg_space		db ' ',0
-msg_crlf		db 0dh,0ah,0
-
-gfx_slash		db '/', 0
-db0			db 0
-menu_timeout		dd 100
-
-keyword_text_label	db 6,'label',0
-keyword_text_default	db 7,'default',0
-keyword_text_timeout	db 7,'timeout',0
-keywords		equ $
-			dw keyword_text_label
-			dw do_label
-			dw keyword_text_default
-			dw do_default
-			dw keyword_text_timeout
-			dw do_timeout
-keyword_cnt		dw ($-keywords)/4
-
-; menu entry descriptor
-menu_entries		equ 0
-menu_default		equ 2		; seg:ofs
-menu_ent_list		equ 6		; seg:ofs
-menu_ent_size		equ 10
-menu_arg_list		equ 12		; seg:ofs
-menu_arg_size		equ 16
-sizeof_menu_desc	equ 18
-
-; system config data (52 bytes)
-gfx_sysconfig		equ $
-gfx_bootloader		db 1			;  0: boot loader type (0: lilo, 1: syslinux, 2: grub)
-gfx_sector_shift	db 9			;  1: sector shift
-gfx_media_type		db 0			;  2: media type (0: disk, 1: floppy, 2: cdrom)
-gfx_failsafe		db 0			;  3: turn on failsafe mode (bitmask)
-						;     0: SHIFT pressed
-						;     1: skip gfxboot
-						;     2: skip monitor detection
-gfx_sysconfig_size	db gfx_sysconfig_end-gfx_sysconfig	;  4: size of sysconfig data
-gfx_boot_drive		db 0			;  5: BIOS boot drive
-gfx_callback		dw gfx_cb		;  6: offset to callback handler
-gfx_bootloader_seg	dw 0			;  8: code/data segment used by bootloader; must follow gfx_callback
-gfx_reserved_1		dw 0			; 10
-gfx_user_info_0		dd 0			; 12: data for info box
-gfx_user_info_1		dd 0			; 16: data for info box
-gfx_bios_mem_size	dd 0			; 20: BIOS memory size (in bytes)
-gfx_xmem_0		dw 0			; 24: extended mem area 0 (start:size in MB; 12:4 bits)
-gfx_xmem_1		dw 0			; 26: extended mem area 1
-gfx_xmem_2		dw 0			; 28: extended mem area 2
-gfx_xmem_3		dw 0			; 20: extended mem area 3
-gfx_file		dd 0			; 32: start of gfx file
-gfx_archive_start	dd 0			; 36: start of cpio archive
-gfx_archive_end		dd 0			; 40: end of cpio archive
-gfx_mem0_start		dd 0			; 44: low free memory start
-gfx_mem0_end		dd 0			; 48: low free memory end
-gfx_sysconfig_end	equ $
-
-			section .bss align=4096
-trackbufsize		equ 16384
-trackbuf		resb trackbufsize
-configbuf		resb trackbufsize
-
-dentry_buf		resb 512
-dentry_buf_len		equ $ - dentry_buf
-
-max_cmd_len		equ 2047
-command_line		resb max_cmd_len+2
-
-NumBuf			resb 15
-NumBufEnd		resb 1
-
-			alignb 4
-derivative_id		resb 1
-drivenumber		resb 1
-sectorshift		resb 1
-			resb 1			; Pad
-sectorsize		resw 1
-BufSafe			resw 1
-file_length		resd 1
-
-bufbytes		resw 1
-bufdata			resw 1
-ungetc_cnt		resb 1
-ungetcdata		resb 1
-
-f_handle		resw 1
-f_size			resd 1
-fname_buf		resb 64
-fname_buf_len		equ $ - fname_buf
-
-label_cnt		resw 1
-
-menu_desc		resb sizeof_menu_desc
-menu_seg		resw 1
-menu_off		resw 1
-
-gfx_mem_start_seg	resw 1
-gfx_mem_end_seg		resw 1
-
-			alignb 4
-gfx_mem			resd 1		; linear address
-gfx_save_area1		resd 1		; 64k
-gfx_save_area1_used	resb 1		; != 0 if area1 is in use
-
-			alignb 4
-; interface to loadable gfx extension (seg:ofs values)
-gfx_bc_jt		resd 1
-
-gfx_bc_init		resd 1
-gfx_bc_done		resd 1
-gfx_bc_input		resd 1
-gfx_bc_menu_init	resd 1