static void
mga4xxenable(VGAscr* scr)
{
Pcidev *pci;
int size;
int i, n, k;
uchar *p;
uchar x[16];
uchar crtcext3;
if(scr->mmio)
return;
pci = mgapcimatch();
if(pci == nil)
return;
scr->mmio = vmap(pci->mem[1].bar&~0x0F, 16*1024);
if(scr->mmio == nil)
return;
addvgaseg("mga4xxmmio", pci->mem[1].bar&~0x0F, pci->mem[1].size);
/* need to map frame buffer here too, so vga can find memory size */
if(pci->did == MGA4xx || pci->did == MGA550)
size = 32*MB;
else
size = 8*MB;
vgalinearaddr(scr, pci->mem[0].bar&~0x0F, size);
if(scr->paddr){
/* Find out how much memory is here, some multiple of 2 MB */
/* First Set MGA Mode ... */
crtcext3 = crtcextset(scr, 3, 0x80, 0x00);
p = scr->vaddr;
n = (size / MB) / 2;
for(i = 0; i < n; i++){
k = (2*i+1)*MB;
p[k] = 0;
p[k] = i+1;
*((uchar*)scr->mmio + CACHEFLUSH) = 0;
x[i] = p[k];
}
for(i = 1; i < n; i++)
if(x[i] != i+1)
break;
scr->apsize = 2*i*MB; /* sketchy */
addvgaseg("mga4xxscreen", scr->paddr, scr->apsize);
crtcextset(scr, 3, crtcext3, 0xff);
}
}
static void
vmwarelinear(VGAscr* scr, int, int)
{
Pcidev *p;
p = scr->pci;
if(p == nil || p->vid != PCIVMWARE)
return;
switch(p->did){
default:
return;
case VMWARE1:
vm->ver = 1;
vm->ra = 0x4560;
vm->rd = 0x4560 + 4;
break;
case VMWARE2:
vm->ver = 2;
vm->ra = p->mem[0].bar & ~3;
vm->rd = vm->ra + 1;
break;
}
// vm->fb = vmrd(vm, Rfbstart);
vm->fb = p->mem[1].bar & ~0xF;
vm->fb += vmrd(vm, Rfboffset);
vgalinearaddr(scr, vm->fb, vmrd(vm, Rfbmaxsize));
if(scr->apsize)
addvgaseg("vmwarescreen", scr->paddr, scr->apsize);
if(scr->mmio==nil){
ulong mmiobase, mmiosize;
// mmiobase = vmrd(vm, Rmemstart);
mmiobase = p->mem[2].bar & ~0xF;
if(mmiobase == 0)
return;
mmiosize = vmrd(vm, Rmemsize);
scr->mmio = vmap(mmiobase, mmiosize);
if(scr->mmio == nil)
return;
vm->mmio = scr->mmio;
vm->mmiosize = mmiosize;
addvgaseg("vmwaremmio", mmiobase, mmiosize);
}
scr->mmio[FifoMin] = 4*sizeof(ulong);
scr->mmio[FifoMax] = vm->mmiosize;
scr->mmio[FifoNextCmd] = 4*sizeof(ulong);
scr->mmio[FifoStop] = 4*sizeof(ulong);
vmwr(vm, Rconfigdone, 1);
}
void
vgalinearpci(VGAscr *scr)
{
uint32_t paddr;
int i, size, best;
Pcidev *p;
p = scr->pci;
if(p == nil)
return;
/*
* 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;
vgalinearaddr(scr, paddr, size);
return;
}
error("no video memory found on pci card");
}
static void
vesalinear(VGAscr *scr, int _1, int _2)
{
int i, mode, size, havesize;
uint8_t *p;
uint32_t paddr;
Pcidev *pci;
if(hardscreen) {
scr->vaddr = 0;
scr->paddr = scr->apsize = 0;
return;
}
vbecheck();
mode = vbegetmode();
/*
* bochs loses the top bits - cannot use this
if((mode&(1<<14)) == 0)
error("not in linear graphics mode");
*/
mode &= 0x3FFF;
p = vbemodeinfo(mode);
if(!(WORD(p+0) & (1<<4)))
error("not in VESA graphics mode");
if(!(WORD(p+0) & (1<<7)))
error("not in linear graphics mode");
paddr = LONG(p+40);
size = WORD(p+20)*WORD(p+16);
size = ROUNDUP(size, PGSZ);
/*
* figure out max size of memory so that we have
* enough if the screen is resized.
*/
pci = nil;
havesize = 0;
while(!havesize && (pci = pcimatch(pci, 0, 0)) != nil){
if(pci->ccrb != Pcibcdisp)
continue;
for(i=0; i<nelem(pci->mem); i++)
if(paddr == (pci->mem[i].bar&~0x0F)){
if(pci->mem[i].size > size)
size = pci->mem[i].size;
havesize = 1;
break;
}
}
/* no pci - heuristic guess */
if (!havesize)
if(size < 4*1024*1024)
size = 4*1024*1024;
else
size = ROUND(size, 1024*1024);
if(size > 16*1024*1024) /* arbitrary */
size = 16*1024*1024;
vgalinearaddr(scr, paddr, size);
if(scr->apsize)
addvgaseg("vesascreen", scr->paddr, scr->apsize);
if(Usesoftscreen){
hardscreen = scr->vaddr;
scr->vaddr = 0;
scr->paddr = scr->apsize = 0;
}
}