ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /os/pc/devvga.c/
/*
* VGA controller
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
typedef struct Vgaseg Vgaseg;
struct Vgaseg {
QLock;
ulong pa;
ulong len;
void* va;
};
enum {
Nvgaseg = 4,
Qdir = 0,
Qvgactl,
Qvgaovl,
Qvgaovlctl,
Qsegs,
Qmax = Qsegs+Nvgaseg
};
static Dirtab vgadir[Qmax] = {
".", { Qdir, 0, QTDIR }, 0, 0550,
"vgactl", { Qvgactl, 0 }, 0, 0660,
"vgaovl", { Qvgaovl, 0 }, 0, 0660,
"vgaovlctl", { Qvgaovlctl, 0 }, 0, 0660,
/* dynamically-created memory segments are added here */
};
static Vgaseg vgasegs[Nvgaseg];
static Lock vgadirlock;
static int nvgadir = Qsegs;
enum {
CMactualsize,
CMblank,
CMblanktime,
CMdrawinit,
CMhwaccel,
CMhwblank,
CMhwgc,
CMlinear,
CMpalettedepth,
CMpanning,
CMsize,
CMtype,
CMunblank,
};
static Cmdtab vgactlmsg[] = {
CMactualsize, "actualsize", 2,
CMblank, "blank", 1,
CMblanktime, "blanktime", 2,
CMdrawinit, "drawinit", 1,
CMhwaccel, "hwaccel", 2,
CMhwblank, "hwblank", 2,
CMhwgc, "hwgc", 2,
CMlinear, "linear", 0,
CMpalettedepth, "palettedepth", 2,
CMpanning, "panning", 2,
CMsize, "size", 3,
CMtype, "type", 2,
CMunblank, "unblank", 1,
};
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;
}
void
addvgaseg(char *name, ulong pa, ulong size)
{
int i;
Dirtab d;
Vgaseg *s;
ulong va;
va = mmukmap(pa, 0, size);
if(va == 0)
return;
memset(&d, 0, sizeof(d));
strecpy(d.name, d.name+sizeof(name), name);
lock(&vgadirlock);
for(i=0; i<nvgadir; i++)
if(strcmp(vgadir[i].name, name) == 0){
unlock(&vgadirlock);
print("devvga: duplicate segment %s\n", name);
return;
}
if(nvgadir >= nelem(vgadir)){
unlock(&vgadirlock);
print("devvga: segment %s: too many segments\n", name);
return;
}
d.qid.path = nvgadir;
d.perm = 0660;
d.length = size;
s = &vgasegs[nvgadir-Qsegs];
s->pa = pa;
s->len = size;
s->va = (void*)va;
vgadir[nvgadir] = d;
nvgadir++;
unlock(&vgadirlock);
}
static long
vgasegrd(Vgaseg *s, uchar *buf, long n, ulong offset)
{
int i;
uchar *a, *d;
ulong v;
if(offset >= s->len)
return 0;
if(offset+n > s->len)
n = s->len - offset;
d = (uchar*)s->va + offset;
qlock(s);
if(waserror()){
qunlock(s);
nexterror();
}
a = buf;
while(n > 0){
i = 4 - ((ulong)d & 3);
if(i > n)
i = n;
if(i == 3)
i = 2;
switch(i){
case 4:
v = (a[3]<<24) | (a[2]<<16) | (a[1]<<8) | a[0];
*(ulong*)d = v;
break;
case 2:
v = (a[1]<<8) | a[0];
*(ushort*)d = v;
break;
case 1:
*d = *a;
break;
}
d += i;
a += i;
n -= i;
}
poperror();
qunlock(s);
return a-buf;
}
static long
vgasegwr(Vgaseg *s, uchar *buf, long n, ulong offset)
{
int i;
uchar *a, *r;
ulong v;
if(offset >= s->len)
return 0;
if(offset+n > s->len)
n = s->len - offset;
r = (uchar*)s->va + offset;
qlock(s);
if(waserror()){
qunlock(s);
nexterror();
}
a = buf;
while(n > 0){
i = 4 - ((ulong)r & 3);
if(i > n)
i = n;
if(i == 3)
i = 2;
switch(i){
case 4:
v = *(ulong*)r;
a[0] = v;
a[1] = v>>8;
a[2] = v>>16;
a[3] = v>>24;
break;
case 2:
v = *(ushort*)r;
a[0] = v;
a[1] = v>>8;
break;
case 1:
*a = *r;
break;
}
r += i;
a += i;
n -= i;
}
poperror();
qunlock(s);
return a-buf;
}
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, nvgadir, devgen);
}
static int
vgastat(Chan* c, uchar* dp, int n)
{
return devstat(c, dp, n, vgadir, nvgadir, devgen);
}
static Chan*
vgaopen(Chan* c, int omode)
{
VGAscr *scr;
static char *openctl = "openctl\n";
scr = &vgascreen[0];
if ((ulong)c->qid.path == Qvgaovlctl) {
if (scr->dev && scr->dev->ovlctl)
scr->dev->ovlctl(scr, c, openctl, strlen(openctl));
else
error(Enonexist);
}
return devopen(c, omode, vgadir, nvgadir, devgen);
}
static void
vgaclose(Chan* c)
{
VGAscr *scr;
static char *closectl = "closectl\n";
scr = &vgascreen[0];
if((ulong)c->qid.path == Qvgaovlctl)
if(scr->dev && scr->dev->ovlctl){
if(waserror()){
print("ovlctl error: %s\n", up->env->errstr);
return;
}
scr->dev->ovlctl(scr, c, closectl, strlen(closectl));
poperror();
}
}
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, nvgadir, 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, "blank time %lud idle %d state %s\n",
blanktime, drawidletime(), scr->isblank ? "off" : "on");
len += snprint(p+len, READSTR-len, "hwaccel %s\n", hwaccel ? "on" : "off");
len += snprint(p+len, READSTR-len, "hwblank %s\n", hwblank ? "on" : "off");
len += snprint(p+len, READSTR-len, "panning %s\n", panning ? "on" : "off");
snprint(p+len, READSTR-len, "addr 0x%lux\n", scr->aperture);
n = readstr(offset, a, n, p);
poperror();
free(p);
return n;
case Qvgaovl:
case Qvgaovlctl:
error(Ebadusefd);
break;
default:
if(c->qid.path < nvgadir)
return vgasegrd(&vgasegs[c->qid.path], a, n, offset);
error(Egreg);
break;
}
return 0;
}
static char Ebusy[] = "vga already configured";
static void
vgactl(Cmdbuf *cb)
{
int align, i, size, x, y, z;
char *chanstr, *p;
ulong chan;
Cmdtab *ct;
VGAscr *scr;
extern VGAdev *vgadev[];
extern VGAcur *vgacur[];
scr = &vgascreen[0];
ct = lookupcmd(cb, vgactlmsg, nelem(vgactlmsg));
switch(ct->index){
case CMhwgc:
if(strcmp(cb->f[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(cb->f[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;
}
break;
case CMtype:
for(i = 0; vgadev[i]; i++){
if(strcmp(cb->f[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;
}
break;
case CMsize:
if(drawhasclients())
error(Ebusy);
x = strtoul(cb->f[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 = cb->f[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;
case CMactualsize:
if(scr->gscreen == nil)
error("set the screen size first");
x = strtoul(cb->f[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");
physgscreenr = Rect(0,0,x,y);
scr->gscreen->clipr = physgscreenr;
return;
case CMpalettedepth:
x = strtoul(cb->f[1], &p, 0);
if(x != 8 && x != 6)
error(Ebadarg);
scr->palettedepth = x;
return;
case CMdrawinit:
memimagedraw(scr->gscreen, scr->gscreen->r, memblack, ZP, nil, ZP, S);
if(scr && scr->dev && scr->dev->drawinit)
scr->dev->drawinit(scr);
return;
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(size, align))
error("not enough free address space");
return;
case CMblank:
drawblankscreen(1);
return;
case CMunblank:
drawblankscreen(0);
return;
case CMblanktime:
blanktime = strtoul(cb->f[1], 0, 0);
return;
case CMpanning:
if(strcmp(cb->f[1], "on") == 0){
if(scr == nil || scr->cur == nil)
error("set screen first");
if(!scr->cur->doespanning)
error("panning not supported");
scr->gscreen->clipr = scr->gscreen->r;
panning = 1;
}
else if(strcmp(cb->f[1], "off") == 0){
scr->gscreen->clipr = physgscreenr;
panning = 0;
}else
break;
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");
}
char Enooverlay[] = "No overlay support";
static long
vgawrite(Chan* c, void* a, long n, vlong off)
{
ulong offset = off;
Cmdbuf *cb;
VGAscr *scr;
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(cb);
poperror();
free(cb);
return n;
case Qvgaovl:
scr = &vgascreen[0];
if (scr->dev == nil || scr->dev->ovlwrite == nil) {
error(Enooverlay);
break;
}
return scr->dev->ovlwrite(scr, a, n, off);
case Qvgaovlctl:
scr = &vgascreen[0];
if (scr->dev == nil || scr->dev->ovlctl == nil) {
error(Enooverlay);
break;
}
scr->dev->ovlctl(scr, c, a, n);
return n;
default:
if(c->qid.path < nvgadir)
return vgasegwr(&vgasegs[c->qid.path], a, n, offset);
error(Egreg);
break;
}
return 0;
}
Dev vgadevtab = {
'v',
"vga",
vgareset,
devinit,
devshutdown,
vgaattach,
vgawalk,
vgastat,
vgaopen,
devcreate,
vgaclose,
vgaread,
devbread,
vgawrite,
devbwrite,
devremove,
devwstat,
};