Detect a certain type of PCIBIOS brain damage. For some reason,

some bios vendors took it apon themselves to "censor" the
host->pci bridges from PCIBIOS callers, even when the caller
explicitly asks for them.  This includes certain Compaq machines
(eg: DL360) and some laptops.

If we detect this, shut down pcibios and revert to using IO
port bashing.

Under -current, apcica does a better job anyway.

1 files changed, 13 insertions, 0 deletions

diff --git a/sys/amd64/pci/pci_cfgreg.c b/sys/amd64/pci/pci_cfgreg.c
index 7b73486..3538969 100644
--- a/sys/amd64/pci/pci_cfgreg.c
+++ b/sys/amd64/pci/pci_cfgreg.c
@@ -71,6 +71,19 @@ static int	pcireg_cfgopen(void);
 static struct PIR_table	*pci_route_table;
 static int		pci_route_count;
 
+int
+pci_pcibios_active(void)
+{
+    return usebios;
+}
+
+int
+pci_kill_pcibios(void)
+{
+    usebios = 0;
+    return pcireg_cfgopen() != 0;
+}
+
 /* 
  * Initialise access to PCI configuration space 
  */