#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"io.h"#include	"../port/error.h" #include	<libg.h>#include	<gnot.h>#include	"devtab.h"#include	"vga.h" /* *  Driver for various VGA cards */ char	vgacard[NAMELEN];	/* vga card type */struct screeninfo {	int	maxx, maxy;	/* current bits per screen */	int	packed;		/* 0=planar, 1=packed */	int	interlaced;	/* != 0 if interlaced */} screeninfo; enum {	Qdir=		0,	Qvgasize=	1,	Qvgatype=	2,	Qvgaport=	3,	Nvga=		4,}; Dirtab vgadir[]={	"vgatype",	{Qvgatype},	0,		0666,	"vgasize",	{Qvgasize},	0,		0666,	"vgaport",	{Qvgaport},	0,		0666,}; /* a routine from ../port/devcons.c */extern	int readstr(ulong, char *, ulong, char *); voidconfigsetup(void) {} voidconfigreset(void) {	strcpy(vgacard, "generic");	screeninfo.maxx = 640;	screeninfo.maxy = 480;	screeninfo.packed = 0;	screeninfo.interlaced = 0;} voidconfiginit(void){} Chan*configattach(char *upec){	return devattach('v', upec);} Chan*configclone(Chan *c, Chan *nc){	return devclone(c, nc);} intconfigwalk(Chan *c, char *name){	return devwalk(c, name, vgadir, Nvga, devgen);} voidconfigstat(Chan *c, char *dp){	devstat(c, dp, vgadir, Nvga, devgen);} Chan*configopen(Chan *c, int omode){	return devopen(c, omode, vgadir, Nvga, devgen);} voidconfigcreate(Chan *c, char *name, int omode, ulong perm){	USED(c, name, omode, perm);	error(Eperm);} voidconfigclose(Chan *c){	USED(c);} longconfigread(Chan *c, void *buf, long n, ulong offset){	int port;	uchar *cp = buf; 	switch(c->qid.path&~CHDIR){	case Qdir:		return devdirread(c, buf, n, vgadir, Nvga, devgen);	case Qvgatype:		return readstr(offset, buf, n, vgacard);	case Qvgaport:		if (offset + n >= 0x8000)			error(Ebadarg);		for (port=offset; port<offset+n; port++)			*cp++ = inb(port);		return n;	}	error(Eperm);	return 0;} longconfigwrite(Chan *c, void *buf, long n, ulong offset){	char cbuf[20], *cp;	int port, maxx, maxy, ldepth; 	switch(c->qid.path&~CHDIR){	case Qdir:		error(Eperm);	case Qvgatype:		error(Eperm);	case Qvgasize:		if(offset != 0)			error(Ebadarg);		if(n >= sizeof(cbuf))			n = sizeof(cbuf) - 1;		memmove(cbuf, buf, n);		cbuf[n] = 0;		cp = cbuf;		maxx = strtoul(cp, &cp, 0);		if(*cp!=0)			cp++;		maxy = strtoul(cp, &cp, 0);		if(*cp!=0)			cp++;		switch(strtoul(cp, &cp, 0)){		case 1:			ldepth = 0;			break;		case 2:			ldepth = 1;			break;		case 4:			ldepth = 2;			break;		case 8:			ldepth = 3;			break;		default:			ldepth = -1;		}		if(maxx == 0 || maxy == 0		|| maxx > 1280 || maxy > 1024		|| ldepth > 3 || ldepth < 0)			error(Ebadarg);		setscreen(maxx, maxy, ldepth);		return n;	case Qvgaport:		cp = buf;		if (offset + n >= 0x8000)			error(Ebadarg);		for (port=offset; port<offset+n; port++) {			outb(port, *cp++);		}		return n;	}	error(Eperm);	return 0;} voidconfigremove(Chan *c){	USED(c);	error(Eperm);} voidconfigwstat(Chan *c, char *dp){	USED(c, dp);	error(Eperm);}