com32/lib/pci/readx.c

   1 #include "pci/pci.h"
   2
   3 TYPE BWL(pci_read) (pciaddr_t a)
   4 {
   5     TYPE r;
   6
   7     for (;;) {
   8         switch (__pci_cfg_type) {
   9         case PCI_CFG_AUTO:
  10             pci_set_config_type(PCI_CFG_AUTO);
  11             break;              /* Try again */
  12
  13         case PCI_CFG_TYPE1:
  14             {
  15                 uint32_t oldcf8;
  16                 cli();
  17                 oldcf8 = inl(0xcf8);
  18                 outl(a, 0xcf8);
  19                 r = BWL(in) (0xcfc + (a & 3));
  20                 outl(oldcf8, 0xcf8);
  21                 sti();
  22             }
  23             return r;
  24
  25         case PCI_CFG_TYPE2:
  26             {
  27                 uint8_t oldcf8, oldcfa;
  28
  29                 if (a & (0x10 << 11))
  30                     return (TYPE) ~ 0;  /* Device 16-31 not supported */
  31
  32                 cli();
  33                 oldcf8 = inb(0xcf8);
  34                 oldcfa = inb(0xcfa);
  35                 outb(0xf0 + ((a >> (8 - 1)) & 0x0e), 0xcf8);
  36                 outb(a >> 16, 0xcfa);
  37                 r = BWL(in) (0xc000 + ((a >> (11 - 8)) & 0xf00) + (a & 0xff));
  38                 outb(oldcf8, 0xcf8);
  39                 outb(oldcfa, 0xcfa);
  40                 sti();
  41             }
  42             return r;
  43
  44         case PCI_CFG_BIOS:
  45             return (TYPE) __pci_read_write_bios(BIOSCALL, 0, a);
  46
  47         default:
  48             return (TYPE) ~ 0;
  49         }
  50     }
  51 }