ref: 887ae1a17b54babf6a0946872bf6faaac1427be1
dir: /sys/src/9/pc/screen.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
#include "../port/error.h"
#define Image IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"
Rectangle physgscreenr;
Memimage *gscreen;
VGAscr vgascreen[1];
int
screensize(int x, int y, int, ulong chan)
{
VGAscr *scr;
qlock(&drawlock);
if(waserror()){
qunlock(&drawlock);
nexterror();
}
if(memimageinit() < 0)
error("memimageinit failed");
lock(&vgascreenlock);
if(waserror()){
unlock(&vgascreenlock);
nexterror();
}
scr = &vgascreen[0];
scr->gscreendata = nil;
scr->gscreen = nil;
if(gscreen){
freememimage(gscreen);
gscreen = nil;
}
if(scr->paddr == 0){
if(scr->dev && scr->dev->page){
scr->vaddr = KADDR(VGAMEM());
scr->apsize = 1<<16;
}
scr->softscreen = 1;
}
if(scr->softscreen){
gscreen = allocmemimage(Rect(0,0,x,y), chan);
scr->useflush = 1;
}else{
static Memdata md;
md.ref = 1;
if((md.bdata = scr->vaddr) == 0)
error("framebuffer not maped");
gscreen = allocmemimaged(Rect(0,0,x,y), chan, &md);
scr->useflush = scr->dev && scr->dev->flush;
}
if(gscreen == nil)
error("no memory for vga memimage");
scr->palettedepth = 6; /* default */
scr->memdefont = getmemdefont();
scr->gscreen = gscreen;
scr->gscreendata = gscreen->data;
physgscreenr = gscreen->r;
vgaimageinit(chan);
unlock(&vgascreenlock);
poperror();
drawcmap();
swcursorinit();
qunlock(&drawlock);
poperror();
return 0;
}
int
screenaperture(int size, int align)
{
VGAscr *scr;
scr = &vgascreen[0];
if(scr->paddr) /* set up during enable */
return 0;
if(size == 0)
return 0;
if(scr->dev && scr->dev->linear){
scr->dev->linear(scr, size, align);
return 0;
}
/*
* Need to allocate some physical address space.
* The driver will tell the card to use it.
*/
size = PGROUND(size);
scr->paddr = upaalloc(size, align);
if(scr->paddr == 0)
return -1;
scr->vaddr = vmap(scr->paddr, size);
if(scr->vaddr == nil)
return -1;
scr->apsize = size;
return 0;
}
uchar*
attachscreen(Rectangle* r, ulong* chan, int* d, int* width, int *softscreen)
{
VGAscr *scr;
scr = &vgascreen[0];
if(scr->gscreen == nil || scr->gscreendata == nil)
return nil;
*r = scr->gscreen->clipr;
*chan = scr->gscreen->chan;
*d = scr->gscreen->depth;
*width = scr->gscreen->width;
if(scr->gscreendata->allocd){
/*
* we use a memimage as softscreen. devdraw will create its own
* screen image on the backing store of that image. when our gscreen
* and devdraws screenimage gets freed, the imagedata will
* be released.
*/
*softscreen = 0xa110c;
scr->gscreendata->ref++;
} else
*softscreen = scr->useflush ? 1 : 0;
return scr->gscreendata->bdata;
}
void
flushmemscreen(Rectangle r)
{
VGAscr *scr;
uchar *sp, *disp, *sdisp, *edisp;
int y, len, incs, off, page;
scr = &vgascreen[0];
if(scr->gscreen == nil || scr->useflush == 0)
return;
if(rectclip(&r, scr->gscreen->r) == 0)
return;
if(scr->dev && scr->dev->flush){
scr->dev->flush(scr, r);
return;
}
disp = scr->vaddr;
incs = scr->gscreen->width*sizeof(ulong);
off = (r.min.x*scr->gscreen->depth) / 8;
len = (r.max.x*scr->gscreen->depth + 7) / 8;
len -= off;
off += r.min.y*incs;
sp = scr->gscreendata->bdata + scr->gscreen->zero + off;
/*
* Linear framebuffer with softscreen.
*/
if(scr->paddr){
sdisp = disp+off;
for(y = r.min.y; y < r.max.y; y++) {
memmove(sdisp, sp, len);
sp += incs;
sdisp += incs;
}
return;
}
/*
* Paged framebuffer window.
*/
if(scr->dev == nil || scr->dev->page == nil)
return;
page = off/scr->apsize;
off %= scr->apsize;
sdisp = disp+off;
edisp = disp+scr->apsize;
scr->dev->page(scr, page);
for(y = r.min.y; y < r.max.y; y++) {
if(sdisp + incs < edisp) {
memmove(sdisp, sp, len);
sp += incs;
sdisp += incs;
}
else {
off = edisp - sdisp;
page++;
if(off <= len){
if(off > 0)
memmove(sdisp, sp, off);
scr->dev->page(scr, page);
if(len - off > 0)
memmove(disp, sp+off, len - off);
}
else {
memmove(sdisp, sp, len);
scr->dev->page(scr, page);
}
sp += incs;
sdisp += incs - scr->apsize;
}
}
}
void
getcolor(ulong p, ulong* pr, ulong* pg, ulong* pb)
{
VGAscr *scr;
ulong x;
scr = &vgascreen[0];
if(scr->gscreen == nil)
return;
switch(scr->gscreen->depth){
default:
x = 0x0F;
break;
case 8:
x = 0xFF;
break;
}
p &= x;
lock(&cursor);
*pr = scr->colormap[p][0];
*pg = scr->colormap[p][1];
*pb = scr->colormap[p][2];
unlock(&cursor);
}
int
setpalette(ulong p, ulong r, ulong g, ulong b)
{
VGAscr *scr;
int d;
scr = &vgascreen[0];
d = scr->palettedepth;
lock(&cursor);
scr->colormap[p][0] = r;
scr->colormap[p][1] = g;
scr->colormap[p][2] = b;
vgao(PaddrW, p);
vgao(Pdata, r>>(32-d));
vgao(Pdata, g>>(32-d));
vgao(Pdata, b>>(32-d));
unlock(&cursor);
return ~0;
}
/*
* On some video cards (e.g. Mach64), the palette is used as the
* DAC registers for >8-bit modes. We don't want to set them when the user
* is trying to set a colormap and the card is in one of these modes.
*/
int
setcolor(ulong p, ulong r, ulong g, ulong b)
{
VGAscr *scr;
int x;
scr = &vgascreen[0];
if(scr->gscreen == nil)
return 0;
switch(scr->gscreen->depth){
case 1:
case 2:
case 4:
x = 0x0F;
break;
case 8:
x = 0xFF;
break;
default:
return 0;
}
p &= x;
return setpalette(p, r, g, b);
}
void
swenable(VGAscr*)
{
swcursorload(&arrow);
}
void
swdisable(VGAscr*)
{
}
void
swload(VGAscr*, Cursor *curs)
{
swcursorload(curs);
}
int
swmove(VGAscr*, Point p)
{
swcursorhide();
swcursordraw(p);
return 0;
}
VGAcur swcursor =
{
"soft",
swenable,
swdisable,
swload,
swmove,
};
void
cursoron(void)
{
VGAscr *scr;
VGAcur *cur;
scr = &vgascreen[0];
cur = scr->cur;
if(cur == nil || cur->move == nil)
return;
if(cur == &swcursor)
qlock(&drawlock);
lock(&cursor);
cur->move(scr, mousexy());
unlock(&cursor);
if(cur == &swcursor)
qunlock(&drawlock);
}
void
cursoroff(void)
{
}
void
setcursor(Cursor* curs)
{
VGAscr *scr;
scr = &vgascreen[0];
if(scr->cur == nil || scr->cur->load == nil)
return;
scr->cur->load(scr, curs);
}
int hwaccel = 0;
int hwblank = 0;
int panning = 0;
int
hwdraw(Memdrawparam *par)
{
VGAscr *scr;
Memimage *dst, *src, *mask;
Memdata *scrd;
int m;
scr = &vgascreen[0];
scrd = scr->gscreendata;
if(scr->gscreen == nil || scrd == nil)
return 0;
if((dst = par->dst) == nil || dst->data == nil)
return 0;
if((src = par->src) && src->data == nil)
src = nil;
if((mask = par->mask) && mask->data == nil)
mask = nil;
if(scr->cur == &swcursor){
if(dst->data->bdata == scrd->bdata)
swcursoravoid(par->r);
if(src && src->data->bdata == scrd->bdata)
swcursoravoid(par->sr);
if(mask && mask->data->bdata == scrd->bdata)
swcursoravoid(par->mr);
}
if(!hwaccel || scr->softscreen)
return 0;
if(dst->data->bdata != scrd->bdata || src == nil || mask == nil)
return 0;
/*
* If we have an opaque mask and source is one opaque
* pixel we can convert to the destination format and just
* replicate with memset.
*/
m = Simplesrc|Simplemask|Fullmask;
if(scr->fill
&& (par->state&m)==m
&& ((par->srgba&0xFF) == 0xFF)
&& (par->op&S) == S)
return scr->fill(scr, par->r, par->sdval);
/*
* If no source alpha, an opaque mask, we can just copy the
* source onto the destination. If the channels are the same and
* the source is not replicated, memmove suffices.
*/
m = Simplemask|Fullmask;
if(scr->scroll
&& src->data->bdata==dst->data->bdata
&& !(src->flags&Falpha)
&& (par->state&m)==m
&& (par->op&S) == S)
return scr->scroll(scr, par->r, par->sr);
return 0;
}
void
blankscreen(int blank)
{
VGAscr *scr;
scr = &vgascreen[0];
if(hwblank){
if(scr->blank)
scr->blank(scr, blank);
else
vgablank(scr, blank);
}
}
static char*
vgalinearaddr0(VGAscr *scr, ulong paddr, int size)
{
int x, nsize;
ulong npaddr;
/*
* new approach. instead of trying to resize this
* later, let's assume that we can just allocate the
* entire window to start with.
*/
if(scr->paddr == paddr && size <= scr->apsize)
return nil;
if(scr->paddr){
/*
* could call vunmap and vmap,
* but worried about dangling pointers in devdraw
*/
return "cannot grow vga frame buffer";
}
/* round to page boundary, just in case */
x = paddr&(BY2PG-1);
npaddr = paddr-x;
nsize = PGROUND(size+x);
/*
* Don't bother trying to map more than 4000x4000x32 = 64MB.
* We only have a 256MB window.
*/
if(nsize > 64*MB)
nsize = 64*MB;
scr->vaddr = vmap(npaddr, nsize);
if(scr->vaddr == 0)
return "cannot allocate vga frame buffer";
scr->vaddr = (char*)scr->vaddr+x;
scr->paddr = paddr;
scr->apsize = nsize;
mtrr(npaddr, nsize, "wc");
return nil;
}
static char*
vgalinearpci0(VGAscr *scr)
{
ulong paddr;
int i, size, best;
Pcidev *p;
p = scr->pci;
/*
* Scan for largest memory region on card.
* Some S3 cards (e.g. Savage) have enormous
* mmio regions (but even larger frame buffers).
* Some 3dfx cards (e.g., Voodoo3) have mmio
* buffers the same size as the frame buffer,
* but only the frame buffer is marked as
* prefetchable (bar&8). If a card doesn't fit
* into these heuristics, its driver will have to
* call vgalinearaddr directly.
*/
best = -1;
for(i=0; i<nelem(p->mem); i++){
if(p->mem[i].bar&1) /* not memory */
continue;
if(p->mem[i].size < 640*480) /* not big enough */
continue;
if(best==-1
|| p->mem[i].size > p->mem[best].size
|| (p->mem[i].size == p->mem[best].size
&& (p->mem[i].bar&8)
&& !(p->mem[best].bar&8)))
best = i;
}
if(best >= 0){
paddr = p->mem[best].bar & ~0x0F;
size = p->mem[best].size;
return vgalinearaddr0(scr, paddr, size);
}
return "no video memory found on pci card";
}
void
vgalinearpci(VGAscr *scr)
{
char *err;
if(scr->pci == nil)
return;
if((err = vgalinearpci0(scr)) != nil)
error(err);
}
void
vgalinearaddr(VGAscr *scr, ulong paddr, int size)
{
char *err;
if((err = vgalinearaddr0(scr, paddr, size)) != nil)
error(err);
}
static char*
bootmapfb(VGAscr *scr, ulong pa, ulong sz)
{
ulong start, end;
Pcidev *p;
int i;
for(p = pcimatch(nil, 0, 0); p != nil; p = pcimatch(p, 0, 0)){
for(i=0; i<nelem(p->mem); i++){
if(p->mem[i].bar & 1)
continue;
start = p->mem[i].bar & ~0xF;
end = start + p->mem[i].size;
if(pa == start && (pa + sz) <= end){
scr->pci = p;
return vgalinearpci0(scr);
}
}
}
return vgalinearaddr0(scr, pa, sz);
}
/*
* called early on boot to attach to framebuffer
* setup by bootloader/firmware or plan9.
*/
void
bootscreeninit(void)
{
static Memdata md;
VGAscr *scr;
int x, y, z;
ulong chan, pa, sz;
char *s, *p, *err;
/* *bootscreen=WIDTHxHEIGHTxDEPTH CHAN PA [SZ] */
s = getconf("*bootscreen");
if(s == nil)
return;
x = strtoul(s, &s, 0);
if(x == 0 || *s++ != 'x')
return;
y = strtoul(s, &s, 0);
if(y == 0 || *s++ != 'x')
return;
z = strtoul(s, &s, 0);
if(*s != ' ')
return;
if((p = strchr(++s, ' ')) == nil)
return;
*p = 0;
chan = strtochan(s);
*p = ' ';
if(chan == 0 || chantodepth(chan) != z)
return;
sz = 0;
pa = strtoul(p+1, &s, 0);
if(pa == 0)
return;
if(*s++ == ' ')
sz = strtoul(s, nil, 0);
if(sz < x * y * (z+7)/8)
sz = x * y * (z+7)/8;
/* map framebuffer */
scr = &vgascreen[0];
if((err = bootmapfb(scr, pa, sz)) != nil){
print("bootmapfb: %s\n", err);
return;
}
if(memimageinit() < 0)
return;
md.ref = 1;
md.bdata = scr->vaddr;
gscreen = allocmemimaged(Rect(0,0,x,y), chan, &md);
if(gscreen == nil)
return;
scr->palettedepth = 6; /* default */
scr->memdefont = getmemdefont();
scr->gscreen = gscreen;
scr->gscreendata = gscreen->data;
scr->softscreen = 0;
scr->useflush = 0;
scr->dev = nil;
physgscreenr = gscreen->r;
vgaimageinit(chan);
vgascreenwin(scr);
/* turn mouse cursor on */
swcursorinit();
scr->cur = &swcursor;
scr->cur->enable(scr);
cursoron();
}
/*
* called from devvga when the framebuffer is setup
* to set *bootscreen= that can be passed on to a
* new kernel on reboot.
*/
void
bootscreenconf(VGAscr *scr)
{
char conf[100], chan[30];
conf[0] = '\0';
if(scr != nil && scr->paddr != 0)
snprint(conf, sizeof(conf), "%dx%dx%d %s %#p %d\n",
scr->gscreen->r.max.x, scr->gscreen->r.max.y,
scr->gscreen->depth, chantostr(chan, scr->gscreen->chan),
scr->paddr, scr->apsize);
ksetenv("*bootscreen", conf, 1);
}