1992/0711/pc/devvga.c (diff list | history)

pc/devvga.c on 1992/0527
1992/0527		#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "../port/error.h"
1992/0603		#include <libg.h> #include <gnot.h>
1992/0527		#include "devtab.h"
1992/0528		#include "vga.h"
1992/0527		/* * Driver for various VGA cards */ char monitor[NAMELEN]; /* monitor name and type */ 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, Qvgamonitor= 1, Qvgasize= 2, Qvgatype= 3,
1992/0528		Qvgaport= 4,
1992/0604		Qvgamem= 5, Nvga= 5,
1992/0527		}; Dirtab vgadir[]={ "vgamonitor", {Qvgamonitor}, 0, 0666, "vgatype", {Qvgatype}, 0, 0666, "vgasize", {Qvgasize}, 0, 0666,
1992/0528		"vgaport", {Qvgaport}, 0, 0666,
1992/0604		"vgamem", {Qvgamem}, 0, 0666,
1992/0527		}; /* a routine from ../port/devcons.c */ extern int readstr(ulong, char *, ulong, char *); void vgasetup(void) { } void vgareset(void) { strcpy(monitor, "generic"); strcpy(vgacard, "generic"); screeninfo.maxx = 640; screeninfo.maxy = 480; screeninfo.packed = 0; screeninfo.interlaced = 0; } void vgainit(void) { } Chan* vgaattach(char *upec) { return devattach('v', upec); } Chan* vgaclone(Chan *c, Chan *nc) { return devclone(c, nc); } int vgawalk(Chan *c, char *name) { return devwalk(c, name, vgadir, Nvga, devgen); } void vgastat(Chan *c, char *dp) { switch(c->qid.path){ default: devstat(c, dp, vgadir, Nvga, devgen); break; } } Chan* vgaopen(Chan *c, int omode) { switch(c->qid.path){ case Qvgamonitor: case Qvgatype: case Qvgasize:
1992/0528		case Qvgaport:
1992/0604		case Qvgamem:
1992/0527		break; } return devopen(c, omode, vgadir, Nvga, devgen); } void vgacreate(Chan *c, char *name, int omode, ulong perm) {
1992/0711		USED(c, name, omode, perm);
1992/0527		error(Eperm); } void vgaclose(Chan *c) {
1992/0711		USED(c);
1992/0527		} long vgaread(Chan *c, void *buf, long n, ulong offset) { char obuf[60];
1992/0711		int port;
1992/0528		uchar *cp = buf; void *outfunc(int, int);
1992/0527		switch(c->qid.path&~CHDIR){ case Qdir: return devdirread(c, buf, n, vgadir, Nvga, devgen); case Qvgamonitor: return readstr(offset, buf, n, monitor); case Qvgatype: return readstr(offset, buf, n, vgacard); case Qvgasize:
1992/0603		sprint(obuf, "%d %d", gscreen.r.max.x, gscreen.r.max.y);
1992/0527		return readstr(offset, buf, n, obuf);
1992/0528		case Qvgaport: if (offset + n >= 0x8000) error(Ebadarg);
1992/0604		for (port=offset; port<offset+n; port++)
1992/0528		*cp++ = inb(port); return n;
1992/0604		case Qvgamem: if (offset > 0x10000) return 0; if (offset + n > 0x10000) n = 0x10000 - offset; memmove(cp, (void *)(SCREENMEM+offset), n); return n;
1992/0527		} } long
1992/0528		vgawrite(Chan *c, void *buf, long n, ulong offset)
1992/0527		{
1992/0603		char cbuf[20], *cp;
1992/0711		int port, maxx, maxy;
1992/0528
1992/0527		switch(c->qid.path&~CHDIR){ case Qdir: error(Eperm); case Qvgamonitor:
1992/0528		if(offset != 0) error(Ebadarg); error(Eperm);
1992/0527		case Qvgatype:
1992/0528		if(offset != 0) error(Ebadarg); error(Eperm);
1992/0527		case Qvgasize:
1992/0528		if(offset != 0) error(Ebadarg);
1992/0604		if(n >= sizeof(cbuf)) n = sizeof(cbuf) - 1;
1992/0603		memmove(cbuf, buf, n);
1992/0604		cbuf[n] = 0;
1992/0603		cp = cbuf; maxx = strtoul(cp, &cp, 0); maxy = strtoul(cp, &cp, 0); if (maxx == 0 || maxy == 0 || maxx > 1280 || maxy > 1024) error(Ebadarg); setscreen(maxx, maxy, 1); return n;
1992/0528		case Qvgaport:
1992/0603		cp = buf;
1992/0528		if (offset + n >= 0x8000) error(Ebadarg);
1992/0603		for (port=offset; port<offset+n; port++) {
1992/0528		outb(port, *cp++);
1992/0603		}
1992/0604		return n; case Qvgamem: if (offset + n > 0x10000) error(Ebadarg); memmove((void *)(SCREENMEM+offset), buf, n);
1992/0528		return n;
1992/0527		} } void vgaremove(Chan *c) {
1992/0711		USED(c);
1992/0527		error(Eperm); } void vgawstat(Chan *c, char *dp) {
1992/0711		USED(c, dp);
1992/0527		error(Eperm); }