pc, pc64: lookup pci device for bootscreen() and maximize framebuffer aperture so can change screen resolution
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cinap_lenrek
parent
d7785060fb
commit
bcc65db171
1 changed files with 92 additions and 58 deletions
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@ -472,16 +472,65 @@ blankscreen(int blank)
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}
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}
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void
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vgalinearpci(VGAscr *scr)
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static char*
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vgalinearaddr0(VGAscr *scr, ulong paddr, int size)
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{
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int x, nsize;
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ulong npaddr;
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/*
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* new approach. instead of trying to resize this
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* later, let's assume that we can just allocate the
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* entire window to start with.
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*/
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if(scr->paddr == paddr && size <= scr->apsize)
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return nil;
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if(scr->paddr){
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/*
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* could call vunmap and vmap,
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* but worried about dangling pointers in devdraw
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*/
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return "cannot grow vga frame buffer";
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}
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/* round to page boundary, just in case */
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x = paddr&(BY2PG-1);
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npaddr = paddr-x;
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nsize = PGROUND(size+x);
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/*
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* Don't bother trying to map more than 4000x4000x32 = 64MB.
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* We only have a 256MB window.
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*/
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if(nsize > 64*MB)
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nsize = 64*MB;
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scr->vaddr = vmap(npaddr, nsize);
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if(scr->vaddr == 0)
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return "cannot allocate vga frame buffer";
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scr->vaddr = (char*)scr->vaddr+x;
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scr->paddr = paddr;
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scr->apsize = nsize;
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if(up != nil){
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/* let mtrr harmlessly fail on old CPUs, e.g., P54C */
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if(!waserror()){
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mtrr(npaddr, nsize, "wc");
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poperror();
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}
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}
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return nil;
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}
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static char*
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vgalinearpci0(VGAscr *scr)
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{
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ulong paddr;
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int i, size, best;
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Pcidev *p;
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p = scr->pci;
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if(p == nil)
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return;
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/*
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* Scan for largest memory region on card.
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@ -510,57 +559,51 @@ vgalinearpci(VGAscr *scr)
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if(best >= 0){
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paddr = p->mem[best].bar & ~0x0F;
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size = p->mem[best].size;
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vgalinearaddr(scr, paddr, size);
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return;
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return vgalinearaddr0(scr, paddr, size);
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}
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error("no video memory found on pci card");
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return "no video memory found on pci card";
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}
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void
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vgalinearpci(VGAscr *scr)
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{
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char *err;
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if(scr->pci == nil)
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return;
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if((err = vgalinearpci0(scr)) != nil)
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error(err);
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}
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void
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vgalinearaddr(VGAscr *scr, ulong paddr, int size)
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{
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int x, nsize;
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ulong npaddr;
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char *err;
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/*
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* new approach. instead of trying to resize this
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* later, let's assume that we can just allocate the
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* entire window to start with.
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*/
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if(scr->paddr == paddr && size <= scr->apsize)
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return;
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if((err = vgalinearaddr0(scr, paddr, size)) != nil)
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error(err);
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}
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if(scr->paddr){
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/*
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* could call vunmap and vmap,
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* but worried about dangling pointers in devdraw
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*/
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error("cannot grow vga frame buffer");
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}
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/* round to page boundary, just in case */
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x = paddr&(BY2PG-1);
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npaddr = paddr-x;
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nsize = PGROUND(size+x);
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/*
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* Don't bother trying to map more than 4000x4000x32 = 64MB.
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* We only have a 256MB window.
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*/
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if(nsize > 64*MB)
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nsize = 64*MB;
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scr->vaddr = vmap(npaddr, nsize);
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if(scr->vaddr == 0)
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error("cannot allocate vga frame buffer");
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scr->vaddr = (char*)scr->vaddr+x;
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scr->paddr = paddr;
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scr->apsize = nsize;
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/* let mtrr harmlessly fail on old CPUs, e.g., P54C */
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if(!waserror()){
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mtrr(npaddr, nsize, "wc");
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poperror();
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static char*
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bootmapfb(VGAscr *scr, ulong pa, ulong sz)
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{
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ulong start, end;
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Pcidev *p;
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int i;
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for(p = pcimatch(nil, 0, 0); p != nil; p = pcimatch(p, 0, 0)){
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for(i=0; i<nelem(p->mem); i++){
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if(p->mem[i].bar & 1)
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continue;
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start = p->mem[i].bar & ~0xF;
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end = start + p->mem[i].size;
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if(pa == start && (pa + sz) <= end){
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scr->pci = p;
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return vgalinearpci0(scr);
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}
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}
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}
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return vgalinearaddr0(scr, pa, sz);
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}
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/*
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@ -574,7 +617,7 @@ bootscreeninit(void)
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VGAscr *scr;
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int x, y, z;
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ulong chan, pa, sz;
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char *s, *p;
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char *s, *p, *err;
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/* *bootscreen=WIDTHxHEIGHTxDEPTH CHAN PA [SZ] */
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s = getconf("*bootscreen");
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@ -609,21 +652,12 @@ bootscreeninit(void)
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if(sz < x * y * (z+7)/8)
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sz = x * y * (z+7)/8;
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/* round to pages */
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z = pa&(BY2PG-1);
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pa -= z;
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sz += z;
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/* map framebuffer */
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scr = &vgascreen[0];
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scr->apsize = PGROUND(sz);
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scr->vaddr = vmap(pa, scr->apsize);
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if(scr->vaddr == 0){
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scr->apsize = 0;
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if((err = bootmapfb(scr, pa, sz)) != nil){
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print("bootmapfb: %s\n", err);
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return;
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}
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scr->vaddr = (char*)scr->vaddr + z;
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scr->paddr = pa + z;
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if(memimageinit() < 0)
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return;
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