ref: 7f224a8f6d343cf0aaf162cc9b9f7d4d62ac78ac
dir: /sys/src/9/alphapc/devvga.c/
/*
* VGA controller
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
extern uchar *vgabios;
enum {
Qdir,
Qvgactl,
Qvgabios,
};
static Dirtab vgadir[] = {
".", { Qdir, 0, QTDIR }, 0, 0550,
"vgactl", { Qvgactl, 0 }, 0, 0660,
"vgabios", { Qvgabios, 0 }, 0x10000, 0440,
};
static void
vgareset(void)
{
/* reserve the 'standard' vga registers */
if(ioalloc(0x2b0, 0x2df-0x2b0+1, 0, "vga") < 0)
panic("vga ports already allocated");
if(ioalloc(0x3c0, 0x3da-0x3c0+1, 0, "vga") < 0)
panic("vga ports already allocated");
conf.monitor = 1;
}
static Chan*
vgaattach(char* spec)
{
if(*spec && strcmp(spec, "0"))
error(Eio);
return devattach('v', spec);
}
Walkqid*
vgawalk(Chan* c, Chan *nc, char** name, int nname)
{
return devwalk(c, nc, name, nname, vgadir, nelem(vgadir), devgen);
}
static int
vgastat(Chan* c, uchar* dp, int n)
{
return devstat(c, dp, n, vgadir, nelem(vgadir), devgen);
}
static Chan*
vgaopen(Chan* c, int omode)
{
return devopen(c, omode, vgadir, nelem(vgadir), devgen);
}
static void
vgaclose(Chan*)
{
}
static void
checkport(int start, int end)
{
/* standard vga regs are OK */
if(start >= 0x2b0 && end <= 0x2df+1)
return;
if(start >= 0x3c0 && end <= 0x3da+1)
return;
if(iounused(start, end))
return;
error(Eperm);
}
static long
vgaread(Chan* c, void* a, long n, vlong off)
{
int len;
char *p, *s;
VGAscr *scr;
ulong offset = off;
char chbuf[30];
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, a, n, vgadir, nelem(vgadir), devgen);
case Qvgactl:
scr = &vgascreen[0];
p = malloc(READSTR);
if(waserror()){
free(p);
nexterror();
}
len = 0;
if(scr->dev)
s = scr->dev->name;
else
s = "cga";
len += snprint(p+len, READSTR-len, "type %s\n", s);
if(scr->gscreen) {
len += snprint(p+len, READSTR-len, "size %dx%dx%d %s\n",
scr->gscreen->r.max.x, scr->gscreen->r.max.y,
scr->gscreen->depth, chantostr(chbuf, scr->gscreen->chan));
if(Dx(scr->gscreen->r) != Dx(physgscreenr)
|| Dy(scr->gscreen->r) != Dy(physgscreenr))
len += snprint(p+len, READSTR-len, "actualsize %dx%d\n",
physgscreenr.max.x, physgscreenr.max.y);
}
len += snprint(p+len, READSTR-len, "blanktime %lud\n", blanktime);
len += snprint(p+len, READSTR-len, "hwaccel %s\n", hwaccel ? "on" : "off");
len += snprint(p+len, READSTR-len, "hwblank %s\n", hwblank ? "on" : "off");
snprint(p+len, READSTR-len, "addr 0x%lux\n", scr->paddr);
n = readstr(offset, a, n, p);
poperror();
free(p);
return n;
case Qvgabios:
if(vgabios == nil)
error(Egreg);
if(offset&0x80000000)
offset &= ~0x800E0000;
if(offset+n > 0x10000)
n = 0x10000-offset;
if(n < 0)
return 0;
memmove(a, vgabios+offset, n);
return n;
default:
error(Egreg);
break;
}
return 0;
}
static char Ebusy[] = "vga already configured";
static void
vgactl(char* a)
{
int align, i, n, size, x, y, z;
char *chanstr, *field[6], *p;
ulong chan;
VGAscr *scr;
extern VGAdev *vgadev[];
extern VGAcur *vgacur[];
Rectangle r;
n = tokenize(a, field, nelem(field));
if(n < 1)
error(Ebadarg);
scr = &vgascreen[0];
if(strcmp(field[0], "hwgc") == 0){
if(n < 2)
error(Ebadarg);
if(strcmp(field[1], "off") == 0){
lock(&cursor);
if(scr->cur){
if(scr->cur->disable)
scr->cur->disable(scr);
scr->cur = nil;
}
unlock(&cursor);
return;
}
for(i = 0; vgacur[i]; i++){
if(strcmp(field[1], vgacur[i]->name))
continue;
lock(&cursor);
if(scr->cur && scr->cur->disable)
scr->cur->disable(scr);
scr->cur = vgacur[i];
if(scr->cur->enable)
scr->cur->enable(scr);
unlock(&cursor);
return;
}
}
else if(strcmp(field[0], "type") == 0){
if(n < 2)
error(Ebadarg);
for(i = 0; vgadev[i]; i++){
if(strcmp(field[1], vgadev[i]->name))
continue;
if(scr->dev && scr->dev->disable)
scr->dev->disable(scr);
scr->dev = vgadev[i];
if(scr->dev->enable)
scr->dev->enable(scr);
return;
}
}
else if(strcmp(field[0], "size") == 0){
if(n < 3)
error(Ebadarg);
if(drawhasclients())
error(Ebusy);
x = strtoul(field[1], &p, 0);
if(x == 0 || x > 2048)
error(Ebadarg);
if(*p)
p++;
y = strtoul(p, &p, 0);
if(y == 0 || y > 2048)
error(Ebadarg);
if(*p)
p++;
z = strtoul(p, &p, 0);
chanstr = field[2];
if((chan = strtochan(chanstr)) == 0)
error("bad channel");
if(chantodepth(chan) != z)
error("depth, channel do not match");
cursoroff(1);
deletescreenimage();
if(screensize(x, y, z, chan))
error(Egreg);
vgascreenwin(scr);
cursoron(1);
return;
}
else if(strcmp(field[0], "actualsize") == 0){
if(scr->gscreen == nil)
error("set the screen size first");
if(n < 2)
error(Ebadarg);
x = strtoul(field[1], &p, 0);
if(x == 0 || x > 2048)
error(Ebadarg);
if(*p)
p++;
y = strtoul(p, nil, 0);
if(y == 0 || y > 2048)
error(Ebadarg);
if(x > scr->gscreen->r.max.x || y > scr->gscreen->r.max.y)
error("physical screen bigger than virtual");
r = Rect(0,0,x,y);
if(!eqrect(r, scr->gscreen->r)){
if(scr->cur == nil || scr->cur->doespanning == 0)
error("virtual screen not supported");
}
physgscreenr = r;
return;
}
else if(strcmp(field[0], "palettedepth") == 0){
if(n < 2)
error(Ebadarg);
x = strtoul(field[1], &p, 0);
if(x != 8 && x != 6)
error(Ebadarg);
scr->palettedepth = x;
return;
}
else if(strcmp(field[0], "drawinit") == 0){
if(scr && scr->dev && scr->dev->drawinit)
scr->dev->drawinit(scr);
return;
}
else if(strcmp(field[0], "linear") == 0){
if(n < 2)
error(Ebadarg);
size = strtoul(field[1], 0, 0);
if(n < 3)
align = 0;
else
align = strtoul(field[2], 0, 0);
if(screenaperture(size, align))
error("not enough free address space");
return;
}
/* else if(strcmp(field[0], "memset") == 0){
if(n < 4)
error(Ebadarg);
memset((void*)strtoul(field[1], 0, 0), atoi(field[2]), atoi(field[3]));
return;
}
*/
else if(strcmp(field[0], "blank") == 0){
if(n < 1)
error(Ebadarg);
drawblankscreen(1);
return;
}
else if(strcmp(field[0], "blanktime") == 0){
if(n < 2)
error(Ebadarg);
blanktime = strtoul(field[1], 0, 0);
return;
}
else if(strcmp(field[0], "hwaccel") == 0){
if(n < 2)
error(Ebadarg);
if(strcmp(field[1], "on") == 0)
hwaccel = 1;
else if(strcmp(field[1], "off") == 0)
hwaccel = 0;
return;
}
else if(strcmp(field[0], "hwblank") == 0){
if(n < 2)
error(Ebadarg);
if(strcmp(field[1], "on") == 0)
hwblank = 1;
else if(strcmp(field[1], "off") == 0)
hwblank = 0;
return;
}
error(Ebadarg);
}
static long
vgawrite(Chan* c, void* a, long n, vlong off)
{
char *p;
ulong offset = off;
switch((ulong)c->qid.path){
case Qdir:
error(Eperm);
case Qvgactl:
if(offset || n >= READSTR)
error(Ebadarg);
p = malloc(READSTR);
if(waserror()){
free(p);
nexterror();
}
memmove(p, a, n);
p[n] = 0;
vgactl(p);
poperror();
free(p);
return n;
default:
error(Egreg);
break;
}
return 0;
}
Dev vgadevtab = {
'v',
"vga",
vgareset,
devinit,
devshutdown,
vgaattach,
vgawalk,
vgastat,
vgaopen,
devcreate,
vgaclose,
vgaread,
devbread,
vgawrite,
devbwrite,
devremove,
devwstat,
};