x86/pci: Clean up open-coded PCIBIOS return code mangling

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Per PCI Firmware spec r3.3, sec 2.5.2, 2.6.2, and 2.7, the return code for
these PCI BIOS interfaces is in 8 bits of the EAX register.  Previously it
was extracted by open-coded masks and shifting.

Name the return code bits with a #define and add pcibios_get_return_code()
to extract the return code to improve code readability. In addition,
replace zero test with PCIBIOS_SUCCESSFUL.

No functional changes intended.

Link: https://lore.kernel.org/r/20231124085924.13830-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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Ilpo Järvinen 2023-11-24 10:59:24 +02:00 • committed by Bjorn Helgaas

parent 420ac76610

commit 0d481ff35c

1 changed files with 21 additions and 7 deletions

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arch/x86/pci/pcbios.c

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