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Protocols — PCI Bus Support
Version 1.10 12/01/02 12-11
//*******************************************************
// EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS
//*******************************************************
typedef struct {
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM Read;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM Write;
} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS;
//*******************************************************
// EFI PCI Root Bridge I/O Protocol Attribute bits
//*******************************************************
#define EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001
#define EFI_PCI_ATTRIBUTE_ISA_IO 0x0002
#define EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO 0x0004
#define EFI_PCI_ATTRIBUTE_VGA_MEMORY 0x0008
#define EFI_PCI_ATTRIBUTE_VGA_IO 0x0010
#define EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO 0x0020
#define EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO 0x0040
#define EFI_PCI_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080
#define EFI_PCI_ATTRIBUTE_MEMORY_CACHED 0x0800
#define EFI_PCI_ATTRIBUTE_MEMORY_DISABLE 0x1000
#define EFI_PCI_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000
EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO
If this bit is set, then the PCI I/O cycles between 0x00000000 and 0x000000FF are
forwarded onto a PCI root bridge. This bit is used to forward I/O cycles for ISA
motherboard devices onto a PCI root bridge.
EFI_PCI_ATTRIBUTE_ISA_IO
If this bit is set, then the PCI I/O cycles between 0x100 and 0x3FF 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 legacy ISA devices onto a PCI root bridge.
EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO
If this bit is set, then the PCI I/O write cycles for 0x3C6, 0x3C8, and 0x3C9 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 write cycles to the VGA palette registers onto a PCI root bridge.
EFI_PCI_ATTRIBUTE_VGA_MEMORY
If this bit is set, then the PCI memory cycles between 0xA0000 and 0xBFFFF are
forwarded onto a PCI root bridge. This bit is used to forward memory cycles for a VGA
frame buffer onto a PCI root bridge.