[ipxe-devel] [ipxe/ipxe] implement api to convert pci address to host address (#117)

[Pankaj Bansal]

The PCI device address may not be same as host address (CPU view address)
To read/write directly to PCI device's BARs (without using
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Mem.Read() and
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Mem.Write()) we need to convert PCI
device address to host address.

The UEFI specifications 2.7 provide a method to translate the PCI device
address to host address and vice versa.

device address = host address + translation offset

EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Configuration() method can provide us with
the translation offset and host address range.

Using this we can convert the PCI device address to host address.

Signed-off-by: Pankaj Bansal <pankaj.bansal at nxp.com>
You can view, comment on, or merge this pull request online at:

  https://github.com/ipxe/ipxe/pull/117

-- Commit Summary --

  * implement api to convert pci address to host address

-- File Changes --

    M src/include/ipxe/pci_io.h (10)
    M src/interface/efi/efi_pci.c (60)

-- Patch Links --

https://github.com/ipxe/ipxe/pull/117.patch
https://github.com/ipxe/ipxe/pull/117.diff

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