ref: ec8d7cdf024949d73c5f887f23f060cd33c1df28
dir: /sys/src/9/pc/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/pci.h"
#include "../port/error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
enum {
Qdir,
Qvgactl,
};
static Dirtab vgadir[] = {
".", { Qdir, 0, QTDIR }, 0, 0550,
"vgactl", { Qvgactl, 0 }, 0, 0660,
};
enum {
CMactualsize,
CMdrawinit,
CMhwaccel,
CMhwblank,
CMhwgc,
CMlinear,
CMpalettedepth,
CMsize,
CMtextmode,
CMtype,
CMsoftscreen,
CMpcidev,
CMtilt,
};
static Cmdtab vgactlmsg[] = {
CMactualsize, "actualsize", 2,
CMdrawinit, "drawinit", 1,
CMhwaccel, "hwaccel", 2,
CMhwblank, "hwblank", 2,
CMhwgc, "hwgc", 2,
CMlinear, "linear", 0,
CMpalettedepth, "palettedepth", 2,
CMsize, "size", 3,
CMtextmode, "textmode", 1,
CMtype, "type", 2,
CMsoftscreen, "softscreen", 2,
CMpcidev, "pcidev", 2,
CMtilt, "tilt", 2,
};
static void
vgareset(void)
{
Pcidev *pci;
VGAscr *scr;
/* 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");
/* find graphics card pci device */
scr = &vgascreen[0];
scr->pci = pci = nil;
while((pci = pcimatch(pci, 0, 0)) != nil){
if(pci->ccrb == Pcibcdisp){
scr->pci = pci;
break;
}
}
conf.monitor = 1;
}
static void
vgashutdown(void)
{
VGAscr *scr;
scr = &vgascreen[0];
if(scr->cur && scr->cur->disable)
scr->cur->disable(scr);
}
static Chan*
vgaattach(char* spec)
{
if(*spec && strcmp(spec, "0"))
error(Enodev);
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 long
vgaread(Chan* c, void* a, long n, vlong off)
{
char *p, *s, *e;
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];
s = smalloc(READSTR);
if(waserror()){
free(s);
nexterror();
}
p = s, e = s+READSTR;
p = seprint(p, e, "type %s\n",
scr->dev != nil ? scr->dev->name : "cga");
if(scr->gscreen != nil) {
Rectangle r;
p = seprint(p, e, "size %dx%dx%d %s\n",
scr->width, scr->height, scr->gscreen->depth,
chantostr(chbuf, scr->gscreen->chan));
r = actualscreensize(scr);
if(scr->width != r.max.x || scr->height != r.max.y)
p = seprint(p, e, "actualsize %dx%d\n", r.max.x, r.max.y);
p = seprint(p, e, "tilt %s\n", tiltstr[scr->tilt]);
}
p = seprint(p, e, "hwgc %s\n",
scr->cur != nil ? scr->cur->name : "off");
p = seprint(p, e, "hwaccel %s\n", hwaccel ? "on" : "off");
p = seprint(p, e, "hwblank %s\n", hwblank ? "on" : "off");
p = seprint(p, e, "addr p 0x%.8llux v %#p size %#ux\n",
scr->paddr, scr->vaddr, scr->apsize);
p = seprint(p, e, "softscreen %s\n", scr->softscreen ? "on" : "off");
USED(p);
n = readstr(offset, a, n, s);
poperror();
free(s);
return n;
default:
error(Egreg);
break;
}
return 0;
}
static char Ebusy[] = "vga already configured";
static char Enoscreen[] = "set the screen size first";
static void
vgactl(VGAscr *scr, Cmdbuf *cb)
{
int align, size, tilt, z, i;
Rectangle r;
char *chanstr, *p;
ulong chan;
Cmdtab *ct;
extern VGAdev *vgadev[];
extern VGAcur *vgacur[];
ct = lookupcmd(cb, vgactlmsg, nelem(vgactlmsg));
switch(ct->index){
case CMhwgc:
if(scr->gscreen == nil)
error(Enoscreen);
if(strcmp(cb->f[1], "off") == 0){
qlock(&drawlock);
cursoroff();
if(scr->cur){
if(scr->cur->disable)
scr->cur->disable(scr);
scr->cur = nil;
}
qunlock(&drawlock);
return;
}
for(i = 0; vgacur[i]; i++){
if(strcmp(cb->f[1], vgacur[i]->name))
continue;
qlock(&drawlock);
cursoroff();
if(scr->cur && scr->cur->disable)
scr->cur->disable(scr);
scr->cur = vgacur[i];
if(scr->cur->enable)
scr->cur->enable(scr);
cursoron();
qunlock(&drawlock);
return;
}
break;
case CMpcidev:
if(cb->nf == 2){
Pcidev *p;
if((p = pcimatchtbdf(strtoul(cb->f[1], 0, 16))) != nil)
scr->pci = p;
} else
error(Ebadarg);
return;
case CMtype:
for(i = 0; vgadev[i]; i++){
if(strcmp(cb->f[1], vgadev[i]->name))
continue;
if(scr->dev){
qlock(&drawlock);
scr->fill = nil;
scr->scroll = nil;
scr->blank = nil;
hwblank = 0;
hwaccel = 0;
qunlock(&drawlock);
if(scr->dev->disable)
scr->dev->disable(scr);
}
scr->dev = vgadev[i];
if(scr->dev->enable)
scr->dev->enable(scr);
return;
}
break;
case CMtextmode:
screeninit();
bootscreenconf(nil);
return;
case CMsize:
r.min = ZP;
r.max.x = strtoul(cb->f[1], &p, 0);
if(*p)
p++;
r.max.y = strtoul(p, &p, 0);
if(*p)
p++;
z = strtoul(p, &p, 0);
if(badrect(r))
error(Ebadarg);
chanstr = cb->f[2];
if((chan = strtochan(chanstr)) == 0)
error("bad channel");
if(chantodepth(chan) != z)
error("depth, channel do not match");
qlock(&drawlock);
deletescreenimage();
setscreensize(scr, r.max.x, r.max.y, z, chan, scr->tilt);
qunlock(&drawlock);
return;
case CMactualsize:
if(scr->gscreen == nil)
error(Enoscreen);
r.min = ZP;
r.max.x = strtoul(cb->f[1], &p, 0);
if(*p)
p++;
r.max.y = strtoul(p, nil, 0);
if(badrect(r))
error(Ebadarg);
if(r.max.x > scr->width || r.max.y > scr->height)
error("physical screen bigger than virtual");
qlock(&drawlock);
deletescreenimage();
setactualsize(scr, r);
goto Resized;
case CMpalettedepth:
z = strtoul(cb->f[1], &p, 0);
if(z != 8 && z != 6)
error(Ebadarg);
scr->palettedepth = z;
return;
case CMsoftscreen:
if(strcmp(cb->f[1], "on") == 0)
scr->softscreen = 1;
else if(strcmp(cb->f[1], "off") == 0)
scr->softscreen = 0;
else
break;
if(0){
case CMtilt:
for(tilt = 0; tilt < nelem(tiltstr); tilt++)
if(strcmp(cb->f[1], tiltstr[tilt]) == 0)
break;
} else {
tilt = scr->tilt;
}
if(scr->gscreen == nil)
return;
qlock(&drawlock);
r = actualscreensize(scr);
chan = scr->gscreen->chan;
z = scr->gscreen->depth;
deletescreenimage();
setscreensize(scr, scr->width, scr->height, z, chan, tilt);
setactualsize(scr, r);
/* no break */
Init:
if(scr->gscreen == nil){
qunlock(&drawlock);
error(Enoscreen);
}
if(scr->dev && scr->dev->drawinit)
scr->dev->drawinit(scr);
hwblank = scr->blank != nil;
hwaccel = scr->fill != nil || scr->scroll != nil;
Resized:
vgascreenwin(scr);
resetscreenimage();
qunlock(&drawlock);
return;
case CMdrawinit:
qlock(&drawlock);
goto Init;
case CMlinear:
if(cb->nf!=2 && cb->nf!=3)
error(Ebadarg);
size = strtoul(cb->f[1], 0, 0);
if(cb->nf == 2)
align = 0;
else
align = strtoul(cb->f[2], 0, 0);
if(screenaperture(scr, size, align) < 0)
error("not enough free address space");
return;
case CMhwaccel:
if(strcmp(cb->f[1], "on") == 0)
hwaccel = 1;
else if(strcmp(cb->f[1], "off") == 0)
hwaccel = 0;
else
break;
return;
case CMhwblank:
if(strcmp(cb->f[1], "on") == 0)
hwblank = 1;
else if(strcmp(cb->f[1], "off") == 0)
hwblank = 0;
else
break;
return;
}
cmderror(cb, "bad VGA control message");
}
static long
vgawrite(Chan* c, void* a, long n, vlong off)
{
ulong offset = off;
Cmdbuf *cb;
switch((ulong)c->qid.path){
case Qdir:
error(Eperm);
case Qvgactl:
if(offset || n >= READSTR)
error(Ebadarg);
cb = parsecmd(a, n);
if(waserror()){
free(cb);
nexterror();
}
vgactl(&vgascreen[0], cb);
poperror();
free(cb);
return n;
default:
error(Egreg);
break;
}
return 0;
}
Dev vgadevtab = {
'v',
"vga",
vgareset,
devinit,
vgashutdown,
vgaattach,
vgawalk,
vgastat,
vgaopen,
devcreate,
vgaclose,
vgaread,
devbread,
vgawrite,
devbwrite,
devremove,
devwstat,
};