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vgavesa: some nvidia cards start the framebuffer in the middle of a pci membar

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This commit is contained in:
cinap_lenrek 2011-11-26 21:24:01 +01:00
parent 9b6ecc6114
commit 440d68d003
1 changed files with 9 additions and 8 deletions
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17
sys/src/9/pc/vgavesa.c
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@ -130,7 +130,6 @@ vesalinear(VGAscr *scr, int, int)
paddr = LONG(p+40);
size = WORD(p+20)*WORD(p+16);
size = PGROUND(size);
/*
* figure out max size of memory so that we have
@ -141,23 +140,25 @@ vesalinear(VGAscr *scr, int, int)
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;
for(i=0; i<nelem(pci->mem); i++){
ulong a, e;
a = pci->mem[i].bar & ~0xF;
e = a + pci->mem[i].size;
if(paddr >= a && (paddr+size) <= e){
size = e - paddr;
havesize = 1;
break;
}
}
}
/* no pci - heuristic guess */
if (!havesize)
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)