1995/0517/pc/pci.c (diff list | history)

pc/pci.c on 1995/0517
1995/0517		#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "../port/error.h" static Lock pcicfglock; /* * Read a chunk of PCI configuration space. * Assumes arguments are within limits and regno and * nbytes are DWORD aligned. */ void pcicfgr(uchar busno, uchar devno, uchar funcno, uchar regno, void* data, int nbytes) { ulong base, *p; int len; lock(&pcicfglock); outb(PCIcse, 0x80|((funcno & 0x07)<<1)); outb(PCIforward, busno); base = (0xC000|(devno<<8)) + regno; p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ *p = inl(base); p++; base += sizeof(ulong); } outb(PCIcse, 0x00); unlock(&pcicfglock); } int pcimatch(uchar busno, uchar devno, PCIcfg* pcicfg) { ulong l; l = 0; pcicfgr(busno, devno, 0, 0, &l, sizeof(ulong)); if((l & 0xFFFF) != pcicfg->vid) return 0; if(pcicfg->did && ((l>>16) & 0xFFFF) != pcicfg->did) return 0; pcicfgr(busno, devno, 0, 0, pcicfg, sizeof(PCIcfg)); return 1; }