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| author | Michael Brown | 2005-04-16 13:16:31 +0200 |
|---|---|---|
| committer | Michael Brown | 2005-04-16 13:16:31 +0200 |
| commit | 6e5a3858bff856e41955523e8ffc0251ce601d80 (patch) | |
| tree | 0ef75b19425618f7e848d4ca5d76673383615645 /src/drivers/bus | |
| parent | Improved debugging output (diff) | |
| download | ipxe-6e5a3858bff856e41955523e8ffc0251ce601d80.tar.gz ipxe-6e5a3858bff856e41955523e8ffc0251ce601d80.tar.xz ipxe-6e5a3858bff856e41955523e8ffc0251ce601d80.zip | |
Read number of PCI buses returned by BIOS so that we can scan more
quickly.
Diffstat (limited to 'src/drivers/bus')
| -rw-r--r-- | src/drivers/bus/pci.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/drivers/bus/pci.c b/src/drivers/bus/pci.c index 4b34454c1..44b3a1b49 100644 --- a/src/drivers/bus/pci.c +++ b/src/drivers/bus/pci.c @@ -10,6 +10,13 @@ DEV_BUS( struct pci_device, pci_dev ); static char pci_magic[0]; /* guaranteed unique symbol */ /* + * pci_io.c may know how many buses we have, in which case it can + * overwrite this value. + * + */ +unsigned int pci_max_bus = 0xff; + +/* * Fill in parameters (vendor & device ids, class, membase etc.) for a * PCI device based on bus & devfn. * @@ -18,6 +25,10 @@ static char pci_magic[0]; /* guaranteed unique symbol */ static int fill_pci_device ( struct pci_device *pci ) { uint32_t l; int reg; + + /* Check bus is within range */ + if ( PCI_BUS ( pci->busdevfn ) > pci_max_bus ) + return 0; /* Check to see if there's anything physically present. */ |