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[pci] Generalise pci_num_bus() to pci_discover()

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Allow pci_find_next() to discover devices beyond the first PCI
segment, by generalising pci_num_bus() (which implicitly assumes that
there is only a single PCI segment) with pci_discover() (which has the
ability to return an arbitrary contiguous chunk of PCI bus:dev.fn
address space).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-09-15 16:47:04 +01:00
parent 56b30364c5
commit ff228f745c
10 changed files with 78 additions and 43 deletions
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14
src/arch/x86/interface/pcbios/pcibios.c
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@@ -34,11 +34,13 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
*/
/**
* Determine number of PCI buses within system
* Find next PCI bus:dev.fn address range in system
*
* @ret num_bus Number of buses
* @v busdevfn Starting PCI bus:dev.fn address
* @v range PCI bus:dev.fn address range to fill in
*/
static int pcibios_num_bus ( void ) {
static void pcibios_discover ( uint32_t busdevfn __unused,
struct pci_range *range ) {
int discard_a, discard_D;
uint8_t max_bus;
@@ -57,7 +59,9 @@ static int pcibios_num_bus ( void ) {
"D" ( 0 )
: "ebx", "edx" );
return ( max_bus + 1 );
/* Populate range */
range->start = PCI_BUSDEVFN ( 0, 0, 0, 0 );
range->count = PCI_BUSDEVFN ( 0, ( max_bus + 1 ), 0, 0 );
}
/**
@@ -114,7 +118,7 @@ int pcibios_write ( struct pci_device *pci, uint32_t command, uint32_t value ){
return ( status >> 8 );
}
PROVIDE_PCIAPI ( pcbios, pci_num_bus, pcibios_num_bus );
PROVIDE_PCIAPI ( pcbios, pci_discover, pcibios_discover );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_byte );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_word );
PROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_dword );