I have to write some code to insert a non-standard bridge
(it identifies itself as bridge-other, but it functions
as a pci-pci bridge).
I'm going to be using 2.4.2x and eventually 2.6.x for intel
and ppc...
In the pci_dev structure (for 2.4.29)
there's
(in include/linux/pci.h)
00355 #define DEVICE_COUNT_RESOURCE 12
00410 struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
We also have:
00431 /*
00432 * For PCI devices, the region numbers are assigned this way:
00433 *
00434 * 0-5 standard PCI regions
00435 * 6 expansion ROM
00436 * 7-10 bridges: address space assigned to buses behind the bridge
00437 */
00438
00439 #define PCI_ROM_RESOURCE 6
00440 #define PCI_BRIDGE_RESOURCES 7
00441 #define PCI_NUM_RESOURCES 11
Now where my confusion sets in:
1) PCI_NUM_RESOURCES + 1 == DEVICE_COUNT_RESOURCE
Why?
2) I understand the first 6 regions (standard) and the expansion rom) --
why 5 more?
3) I've only seen instances of 3 bus regions used -- IO, MEM prefetch,
MEM nonprefetch -- are they order dependent?
4) would it make more sense to have seperate arrays? One of for the
device resources, one for the bridge resources?
Thanks...
Marty Leisner
[email protected]
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