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Extensible Firmware Interface Specification
12-12 12/01/02 Version 1.10
EFI_PCI_ATTRIBUTE_VGA_IO
If this bit is set, then the PCI I/O cycles in the ranges 0x3B0-0x3BB and 0x3C0-0x3DF
are forwarded onto a PCI root bridge using a 10-bit address decoder on address bits 0..9.
Address bits 10..15 are not decoded, and the address bits 16..31 must be zero. This bit is
used to forward I/O cycles for a VGA controller onto a PCI root bridge. Since
EFI_PCI_ATTRIBUTE_ENABLE_VGA_IO also includes the I/O range described by
EFI_PCI_ATTRIBUTE_ENABLE_VGA_PALETTE_IO, the
EFI_PCI_ATTRIBUTE_ENABLE_VGA_PALETTE_IO bit is ignored if
EFI_PCI_ATTRIBUTE_ENABLE_VGA_IO is set.
EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO
If this bit is set, then the PCI I/O cycles in the ranges 0x1F0-0x1F7 and 0x3F6-0x3F7 are
forwarded onto a PCI root bridge using a 10-bit address decoder on address bits 0..9.
Address bits 10..15 are not decoded, and address bits 16..31 must be zero. This bit is
used to forward I/O cycles for a Primary IDE controller onto a PCI root bridge.
EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO
If this bit is set, then the PCI I/O cycles in the ranges 0x170-0x177 and 0x376-0x377 are
forwarded onto a PCI root bridge using a 10-bit address decoder on address bits 0..9.
Address bits 10..15 are not decoded, and address bits 16..31 must be zero. This bit is
used to forward I/O cycles for a Secondary IDE controller onto a PCI root bridge.
EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE
If this bit is set, then this platform supports changing the attributes of a PCI memory
range so that the memory range is accessed in a write combining mode. By default, PCI
memory ranges are not accessed in a write combining mode.
EFI_PCI_ATTRIBUTE_MEMORY_CACHED
If this bit is set, then this platform supports changing the attributes of a PCI memory
range so that the memory range is accessed in a cached mode. By default, PCI memory
ranges are accessed noncached.
EFI_PCI_ATTRIBUTE_MEMORY_DISABLE
If this bit is set, then this platform supports changing the attributes of a PCI memory
range so that the memory range is disabled, and can no longer be accessed. By default,
all PCI memory ranges are enabled.
EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE
This bit may only be used in the Attributes parameter to AllocateBuffer()
. If
this bit is set, then the PCI controller that is requesting a buffer through
AllocateBuffer() is capable of producing PCI Dual Address Cycles, so it is able to
access a 64-bit address space. If this bit is not set, then the PCI controller that is
requesting a buffer through AllocateBuffer() is not capable of producing PCI Dual
Address Cycles, so it is only able to access a 32-bit address space.