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x86/PCI: MMCONFIG: add PCI_MMCFG_BUS_OFFSET() to factor common expression

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This factors out the common "bus << 20" expression used when computing the
MMCONFIG address.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas
2009-11-13 17:34:08 -07:00
committed by Jesse Barnes
parent f7ca698487
commit df5eb1d67e
4 changed files with 18 additions and 17 deletions
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2
arch/x86/include/asm/pci_x86.h
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@@ -124,6 +124,8 @@ extern void __init pci_mmcfg_arch_free(void);
extern struct acpi_mcfg_allocation *pci_mmcfg_config;
extern int pci_mmcfg_config_num;
#define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
/*
* AMD Fam10h CPUs are buggy, and cannot access MMIO config space
* on their northbrige except through the * %eax register. As such, you MUST