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Use the magic of common symbols to allow struct dev to effectively grow at

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link time to accommodate whatever bus objects are included.
This commit is contained in:
Michael Brown
2005-04-14 10:10:54 +00:00
parent 0dc98309b2
commit 75d864432c
8 changed files with 84 additions and 49 deletions
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31
src/drivers/bus/pci.c
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@@ -9,6 +9,14 @@
#define DBG(...)
#endif
/*
* Ensure that there is sufficient space in the shared dev_bus
* structure for a struct pci_device.
*
*/
DEV_BUS( struct pci_device, pci_dev );
static char pci_magic[0]; /* guaranteed unique symbol */
/*
* Fill in parameters (vendor & device ids, class, membase etc.) for a
* PCI device based on bus & devfn.
@@ -112,19 +120,33 @@ void adjust_pci_device ( struct pci_device *pci ) {
* Obtain a struct pci * from a struct dev *
*
* If dev has not previously been used for a PCI device scan, blank
* out dev.pci
* out struct pci
*/
struct pci_device * pci_device ( struct dev *dev ) {
struct pci_device *pci = &dev->pci;
struct pci_device *pci = dev->bus;
if ( dev->devid.bus_type != PCI_BUS_TYPE ) {
if ( pci->magic != pci_magic ) {
memset ( pci, 0, sizeof ( *pci ) );
dev->devid.bus_type = PCI_BUS_TYPE;
pci->magic = pci_magic;
}
pci->dev = dev;
return pci;
}
/*
* Set PCI device to use.
*
* This routine can be called by e.g. the ROM prefix to specify that
* the first device to be tried should be the device on which the ROM
* was physically located.
*
*/
void set_pci_device ( uint16_t busdevfn ) {
pci_dev.magic = pci_magic;
pci_dev.busdevfn = busdevfn;
pci_dev.already_tried = 0;
}
/*
* Find a PCI device matching the specified driver
*
@@ -154,6 +176,7 @@ int find_pci_device ( struct pci_device *pci,
/* Fill in dev structure, if present */
if ( pci->dev ) {
pci->dev->name = driver->name;
pci->dev->devid.bus_type = PCI_BUS_TYPE;
pci->dev->devid.vendor_id = pci->vendor;
pci->dev->devid.device_id = pci->dev_id;
}