cvs commit: src/sys/i386/pci pci_cfgreg.c

[Scott Long]

scottl      2004-12-06 08:27:10 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/pci         pci_cfgreg.c 
  Log:
  Add support for the memory-mapped PCI Express configuration mechanism.  This
  actually is a property of the northbridge and applies to all PCI/PCI-X/PCIe
  devices in the system, though only PCIe devices will respond to registers
  higher than 256.  This uses per-CPU pools of temporary mappings so that
  the whole 256MB of configuration space doesn't have to be mapped all at
  once.  While the sf_buf API was considered for this, the fact that it
  requires sleep locks and can return failure made it unsuitable for this use.
  
  For now only the Intel Grantsdale and Lindenhurst (925 and 752x) chipsets are
  supported.  Since there doesn't appear to be a compatible way to determine
  northbridge support, new chipsets will have to be explicitely added in the
  future.
  
  Revision  Changes    Path
  1.112     +211 -8    src/sys/i386/pci/pci_cfgreg.c