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Contents
Version 1.10 12/01/02 xvii
17.4 Decompressor Design..................................................................................... 17-15
17.5 Decompress Protocol...................................................................................... 17-16
EFI_DECOMPRESS_PROTOCOL .............................................................. 17-16
EFI_DECOMPRESS_PROTOCOL.GetInfo() ............................................. 17-17
EFI_DECOMPRESS_PROTOCOL.Decompress()..................................... 17-19
18 Protocols — Device I/O Protocol
18.1 Device I/O Overview ......................................................................................... 18-1
18.2 DEVICE_IO Protocol......................................................................................... 18-2
DEVICE_IO Protocol...................................................................................... 18-2
DEVICE_IO.Mem(), .Io(), and .Pci()............................................................. 18-5
DEVICE_IO.PciDevicePath() ....................................................................... 18-7
DEVICE_IO.Map() ....................................................................................... 18-8
DEVICE_IO.Unmap()................................................................................. 18-10
DEVICE_IO.AllocateBuffer() ...................................................................... 18-11
DEVICE_IO.Flush() ................................................................................... 18-13
DEVICE_IO.FreeBuffer() ........................................................................... 18-14
19 EFI Byte Code Virtual Machine
19.1 Overview........................................................................................................... 19-1
19.1.1 Processor Architecture Independence...................................................... 19-1
19.1.2 OS Independent ....................................................................................... 19-2
19.1.3 EFI Compliant .......................................................................................... 19-2
19.1.4 Coexistence of Legacy Option ROMs....................................................... 19-2
19.1.5 Relocatable Image ................................................................................... 19-2
19.1.6 Size Restrictions Based on Memory Available.......................................... 19-3
19.2 Memory Ordering.............................................................................................. 19-3
19.3 Virtual Machine Registers ................................................................................. 19-3
19.4 Natural Indexing................................................................................................ 19-5
19.4.1 Sign Bit..................................................................................................... 19-5
19.4.2 Bits Assigned to Natural Units .................................................................. 19-6
19.4.3 Constant................................................................................................... 19-6
19.4.4 Natural Units ............................................................................................ 19-6
19.5 EBC Instruction Operands ................................................................................ 19-7
19.5.1 Direct Operands ....................................................................................... 19-7
19.5.2 Indirect Operands..................................................................................... 19-7
19.5.3 Indirect with Index Operands.................................................................... 19-8
19.5.4 Immediate Operands................................................................................ 19-8
19.6 EBC Instruction Syntax ..................................................................................... 19-9
19.7 Instruction Encoding ......................................................................................... 19-9
19.7.1 Instruction Opcode Byte Encoding ......................................................... 19-10
19.7.2 Instruction Operands Byte Encoding ...................................................... 19-10
19.7.3 Index/Immediate Data Encoding............................................................. 19-11
19.8 EBC Instruction Set......................................................................................... 19-11
ADD........................................................................................................... 19-12
AND........................................................................................................... 19-13
ASHR ........................................................................................................ 19-14
BREAK ...................................................................................................... 19-15