XXX nobios

*** 33,49 ****
  #include <sys/reboot.h>
  #include <sys/pci_impl.h>
  #include <sys/pci_cfgspace.h>
  #include <sys/pci_cfgspace_impl.h>
  #include <sys/pci_cfgacc.h>
  #if defined(__xpv)
  #include <sys/hypervisor.h>
  #endif
  
- #if defined(__xpv)
  int pci_max_nbus = 0xFE;
- #endif
  int pci_bios_cfg_type = PCI_MECHANISM_UNKNOWN;
  int pci_bios_maxbus;
  int pci_bios_mech;
  int pci_bios_vers;
  
--- 33,48 ----
  #include <sys/reboot.h>
  #include <sys/pci_impl.h>
  #include <sys/pci_cfgspace.h>
  #include <sys/pci_cfgspace_impl.h>
  #include <sys/pci_cfgacc.h>
+ #include <sys/machsystm.h>
  #if defined(__xpv)
  #include <sys/hypervisor.h>
  #endif
  
  int pci_max_nbus = 0xFE;
  int pci_bios_cfg_type = PCI_MECHANISM_UNKNOWN;
  int pci_bios_maxbus;
  int pci_bios_mech;
  int pci_bios_vers;
  
*** 251,260 ****
--- 250,271 ----
  {
          struct bop_regs regs;
          uint32_t        carryflag;
          uint16_t        ax, dx;
  
+         if (!bios_calls_available) {
+                 /*
+                  * If this system does not support BIOS calls, we must fall
+                  * back to default values and a search of all of the possible
+                  * PCI buses.
+                  */
+                 pci_bios_mech = 1;
+                 pci_bios_vers = 0;
+                 pci_bios_maxbus = pci_max_nbus;
+                 return (PCI_MECHANISM_1);
+         }
+ 
          bzero(&regs, sizeof (regs));
          regs.eax.word.ax = (PCI_FUNCTION_ID << 8) | PCI_BIOS_PRESENT;
  
          BOP_DOINT(bootops, 0x1a, &regs);
          carryflag = regs.eflags & PS_C;