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Overview
Version 1.10 12/01/02 2-7
2.3 Calling Conventions
Unless otherwise stated, all functions defined in the EFI specification are called through pointers in
common, architecturally defined, calling conventions found in C compilers. Pointers to the various
global EFI functions are found in the EFI_RUNTIME_SERVICES and EFI_BOOT_SERVICES
tables that are located via the EFI system table. Pointers to other functions defined in this
specification are located dynamically through device handles. In all cases, all pointers to EFI
functions are cast with the word EFIAPI. This allows the compiler for each architecture to supply
the proper compiler keywords to achieve the needed calling conventions. When passing pointer
arguments to Boot Services, Runtime Services, and Protocol Interfaces, the caller has the following
responsibilities:
1. It is the caller’s responsibility to pass pointer parameters that reference physical memory
locations. If a pointer is passed that does not point to a physical memory location(i.e. a
memory mapped I/O region), the results are unpredictable and the system may halt.
2. It is the caller’s responsibility to pass pointer parameters with correct alignment. If an
unaligned pointer is passed to a function, the results are unpredictable and the system may halt.
3. It is the caller’s responsibility to not pass in a NULL parameter to a function unless it is
explicitly allowed. If a NULL pointer is passed to a function, the results are unpredictable and
the system may hang.
Calling conventions for IA-32 or Itanium-based applications are described in more detail below.
Any function or protocol may return any valid return code.
2.3.1 Data Types
Table 2-2 lists the common data types that are used in the interface definitions, and Table 2-3 lists
their modifiers. Unless otherwise specified all data types are naturally aligned. Structures are
aligned on boundaries equal to the largest internal datum of the structure and internal data are
implicitly padded to achieve natural alignment.
Table 2-2. Common EFI Data Types
Mnemonic Description
BOOLEAN
Logical Boolean. 1-byte value containinga0forFALSE or a 1 for TRUE. Other
values are undefined.
INTN Signed value of native width. (4 bytes on IA-32, 8 bytes on Itanium processor
instructions)
UINTN Unsigned value of native width. (4 bytes on IA-32, 8 bytes on Itanium processor
instructions)
INT8 1-byte signed value.
UINT8 1-byte unsigned value.
INT16 2-byte signed value.
UINT16 2-byte unsigned value.
continued
- Specification 1
- Acknowledgements 2
- History 3
- Contents 5
- Version 1.10 12/01/02 vii 7
- Version 1.10 12/01/02 ix 9
- Contents 11
- Version 1.10 12/01/02 xi 11
- Version 1.10 12/01/02 xv 15
- Version 1.10 12/01/02 xix 19
- Version 1.10 12/01/02 xxi 21
- Version 1.10 12/01/02 xxv 25
- Introduction 27
- 1-2 12/01/02 Version 1.10 28
- 1.2 Overview 29
- 1.3 Goals 32
- Version 1.10 12/01/02 1-7 33
- 1.4 Target Audience 34
- 1.5 EFI Design Overview 34
- 1.6 EFI Driver Model 35
- 1.6.1 EFI Driver Model Goals 36
- 1.7 Migration Requirements 37
- 1-12 12/01/02 Version 1.10 38
- Version 1.10 12/01/02 1-13 39
- 1.8.5 Pseudo-Code Conventions 40
- 1.8.6 Typographic Conventions 40
- Overview 41
- 2.1.1 EFI Images 42
- 2.1.2 EFI Applications 43
- 2.1.3 EFI OS Loaders 44
- 2.1.4 EFI Drivers 44
- 2.2.1 EFI Services 45
- 2.2.2 Runtime Services 46
- 2.3.1 Data Types 47
- NULL may be 48
- 2.3.2 IA-32 Platforms 49
- 2.3.2.1 Handoff State 50
- 2.3.3 Itanium 51
- -Based Platforms 51
- 2.4 Protocols 52
- Table 2-4. EFI Protocols 54
- 2.5 EFI Driver Model 55
- Figure 2-5. Desktop System 56
- Figure 2-6. Server System 56
- Version 1.10 12/01/02 2-17 57
- 2-18 12/01/02 Version 1.10 58
- Version 1.10 12/01/02 2-19 59
- 2.5.2 Driver Initialization 60
- 2.5.3 Host Bus Controllers 61
- 2.5.4 Device Drivers 63
- 2.5.5 Bus Drivers 64
- Bus Controller 65
- 2.5.6 Platform Components 66
- 2.5.7 Hot-Plug Events 67
- 2.6.1 Required Elements 68
- Version 1.10 12/01/02 2-29 69
- 2-30 12/01/02 Version 1.10 70
- Boot Manager 71
- Descriptor 73
- Table 3-1 Global Variables 75
- 3.4 Boot Mechanisms 77
- 3.4.2.1 Network Booting 78
- 3.4.2.2 Future Boot Media 78
- EFI System Table 79
- 4.2 EFI Table Header 81
- EFI_TABLE_HEADER 81
- 4.3 EFI System Table 82
- EFI_SYSTEM_TABLE 82
- EFI_BOOT_SERVICES 84
- EFI System Table 85
- EFI_RUNTIME_SERVICES 89
- EFI_CONFIGURATION_TABLE 91
- Table 5-2. TPL Usage 101
- Table 5-3. TPL Restrictions 102
- Prototype 103
- Parameters 103
- Related Definitions 103
- 5-6 12/01/02 Version 1.10 104
- Description 105
- Status Codes Returned 106
- ExitBootServices() 117
- Services — Boot Services 125
- Version 1.10 12/01/02 5-27 125
- 5.3 Protocol Handler Services 129
- 5-32 12/01/02 Version 1.10 130
- Version 1.10 12/01/02 5-33 131
- Figure 5-2. Handle Database 132
- Version 1.10 12/01/02 5-35 133
- EFI 1.10 Extension 136
- Examples 152
- 5.4 Image Services 174
- Table 5-9. Image Functions 175
- StartImage() 178
- UnloadImage() 179
- 5-94 12/01/02 Version 1.10 192
- 6.1 Variable Services 194
- GetVariable() 195
- Summary 195
- GetNextVariableName() 197
- SetVariable() 199
- 6.2 Time Services 201
- GetTime() 202
- 6.3 Virtual Memory Services 208
- SetVirtualAddressMap() 209
- ResetSystem() 213
- EFI_LOADED_IMAGE Protocol 217
- Version 1.10 12/01/02 7-3 219
- 8.1 Device Path Overview 221
- 8.2 EFI_DEVICE_PATH Protocol 222
- EFI_DEVICE_PATH Protocol 222
- 8.3 Device Path Nodes 223
- 8.3.2 Hardware Device Path 225
- 8.3.2.1 PCI Device Path 225
- 8.3.2.2 PCCARD Device Path 225
- 8.3.2.4 Vendor Device Path 226
- 8.3.3 ACPI Device Path 227
- Table 8-8. ACPI Device Path 228
- 8.3.4 Messaging Device Path 229
- 8.3.4.1 ATAPI Device Path 229
- 8.3.4.2 SCSI Device Path 230
- 8.3.4.4 1394 Device Path 230
- 8.3.4.5 USB Device Path 231
- 8.3.4.7 I 232
- O Device Path 232
- 8.3.4.9 IPv4 Device Path 232
- 8.3.4.10 IPv6 Device Path 233
- 8.3.4.12 UART Device Path 234
- 8.3.5 Media Device Path 236
- 8.3.5.1 Hard Drive 236
- 8.4.1 Housekeeping Rules 240
- 8.4.3 Rules with ACPI _ADR 241
- 8.4.6 Other Rules 242
- EFI_DRIVER_BINDING_PROTOCOL 243
- Protocol Interface Structure 244
- Version 1.10 12/01/02 9-5 247
- Pseudo Code 249
- 9-8 12/01/02 Version 1.10 250
- Chapter 4 251
- EFI_COMPONENT_NAME_PROTOCOL 289
- 10.1 Console I/O Protocol 295
- SIMPLE_INPUT_INTERFACE 297
- 10.2 Simple Input Protocol 298
- SIMPLE_INPUT 298
- Version 1.10 12/01/02 10-5 299
- SIMPLE_INPUT.ReadKeyStroke() 300
- SIMPLE_TEXT_OUTPUT Protocol 302
- 10.4.1 UGA ROM 318
- 10.4.2 UGA Draw Protocol 319
- 10.4.3 Blt Buffer 319
- 10.4.4 UGA I/O Protocol 320
- 10.4.5 Fallback Mode Driver 320
- 10.5 UGA Draw Protocol 321
- EFI_UGA_DRAW_PROTOCOL 321
- EFI_UGA_DRAW_PROTOCOL.Blt() 325
- 10.7 UGA I/O Protocol 329
- EFI_UGA_IO_PROTOCOL 329
- EFI_SIMPLE_POINTER_PROTOCOL 340
- 10.12 Serial I/O Protocol 349
- SERIAL_IO_PROTOCOL 349
- SERIAL_IO.SetAttributes() 353
- SERIAL_IO.SetControl() 355
- 11.1 LOAD_FILE Protocol 361
- LOAD_FILE Protocol 361
- LOAD_FILE.LoadFile() 362
- 11.2 File System Format 364
- 11.2.1.1 File System Format 365
- 11.2.1.2 File Names 365
- 11.2.1.3 Directory Structure 365
- 11.2.2 Partition Discovery 367
- Partition 369
- Table HDR 369
- 11.2.3 Media Formats 375
- 11.2.3.1 Removable Media 375
- 11.2.3.2 Diskette 375
- 11.2.3.3 Hard Drive 376
- 11.2.3.4 CD-ROM and DVD-ROM 376
- 11.2.3.5 Network 376
- 11.3 File System Protocol 377
- 11.4 EFI_FILE Protocol 380
- EFI_FILE Protocol 380
- EFI_FILE.Open() 382
- EFI_FILE.Write() 387
- EFI_FILE_INFO 393
- 11.5 DISK_IO Protocol 397
- DISK_IO Protocol 397
- 11.6 BLOCK_IO Protocol 401
- BLOCK_IO Protocol 401
- EFI_BLOCK_IO.ReadBlocks() 405
- EFI_BLOCK_IO.WriteBlocks() 407
- UNICODE_COLLATION Protocol 410
- 0 s1 is equivalent to s2 412
- UNICODE_COLLATION.StrLwr() 415
- UNICODE_COLLATION.StrUpr() 416
- UNICODE_COLLATION.FatToStr() 417
- Protocols-PCIBusSupport 419
- Core Chipset Components 420
- Front Side Bus 420
- Device Handle 421
- PCI Local Bus 422
- PCI Host Bus 422
- PCI Root Bridge 422
- PCI Segment 0 424
- PCI Segment 1 424
- 0x26 0x08 Address Length 459
- Image Handle 464
- EFI_LOADED_IMAGE_PROTOCOL 464
- 12.3.2 PCI Bus Drivers 467
- PCI Controller Device Handle 469
- 12.3.2.2 PCI Enumeration 471
- 12.3.3 PCI Device Drivers 471
- 12.4 EFI PCI I/O Protocol 473
- EFI_PCI_IO_PROTOCOL 474
- to the PCI Root Bridge 483
- for the 484
- for the width specified by 486
- , Width, and Count is not 488
- , Width, and Count 495
- , Width, and Count is 495
- EFI_PCI_IO_PROTOCOL.Map() 496
- , and Length 510
- 12.4.1 PCI Device Paths 512
- 12.4.2 PCI Option ROMs 514
- Byte Length Description 515
- to EFI Image 516
- to PCIR Data Structure 516
- PCI Device Driver Image 517
- 12.4.3 Nonvolatile Storage 519
- 12.4.4 PCI Hot-Plug Events 520
- EFI_SCSI_PASS_THRU Protocol 521
- Protocols - USB Support 541
- EFI_USB_HC_PROTOCOL 542
- 14-4 12/01/02 Version 1.10 544
- 14.2 USB Driver Model 574
- 14.2.3 USB Bus Driver 575
- 14.2.3.3 USB Hot-Plug Event 576
- 14.2.4 USB Device Driver 577
- EFI_USB_IO Protocol 578
- Status Code Returned 582
- Protocols — USB Support 599
- 14-62 12/01/02 Version 1.10 602
- 14.2.6 USB Device Paths 604
- EFI_SIMPLE_NETWORK Protocol 607
- IN UINTN BufferSize 624
- EFI_SIMPLE_NETWORK.Receive() 630
- Revision Number 632
- 15.3 PXE Base Code Protocol 635
- EFI_PXE_BASE_CODE Protocol 635
- DHCP Packet Data Types 642
- IP Receive Filter Settings 644
- ARP Cache Entries 644
- EFI_PXE_BASE_CODE.Start() 647
- EFI_PXE_BASE_CODE.Dhcp() 651
- EFI_PXE_BASE_CODE.Discover() 653
- EFI_PXE_BASE_CODE.Mtftp() 656
- EFI_PXE_BASE_CODE.UdpWrite() 660
- EFI_PXE_BASE_CODE.UdpRead() 662
- Protocols — Network Support 665
- Version 1.10 12/01/02 15-59 665
- EFI_BIS.Initialize() 678
- EFI_BIS.Shutdown() 682
- EFI_BIS.GetSignatureInfo() 688
- Digest-Algorithms: SHA-1 697
- EFI_BIS.VerifyBootObject() 701
- 16.1 Overview 715
- EFI_DEBUG_SUPPORT_PROTOCOL 717
- UINT16 Ds; 721
- 16.3 EFI Debugport Protocol 728
- EFI_DEBUGPORT_PROTOCOL 729
- 16.3.2 Debugport Device Path 734
- 16.4.1 Overview 736
- 16.4.3 EFI Image Info 738
- 17.2 Data Format 743
- Block Header 744
- Block Body 744
- Table 17-1 745
- 17.2.3.2 Block Body 747
- 17.3 Compressor Design 748
- 17.3.2 String Info Log 749
- 17.3.2.1 Data Structures 750
- 17.3.2.2 Searching the Tree 751
- 17.3.2.3 Adding String Info 751
- Figure 17-6. Node Split 752
- 17.3.3.3 Code Generation 754
- 17.4 Decompressor Design 755
- 17.5 Decompress Protocol 756
- EFI_DECOMPRESS_PROTOCOL 756
- Protocols-DeviceI/OProtocol 761
- 18.2 DEVICE_IO Protocol 762
- DEVICE_IO Protocol 762
- DEVICE_IO.Map() 768
- DEVICE_IO.AllocateBuffer() 771
- 19.1 Overview 775
- 19.1.2 OS Independent 776
- 19.1.3 EFI Compliant 776
- 19.1.5 Relocatable Image 776
- 19.2 Memory Ordering 777
- 19.4 Natural Indexing 779
- 19.4.3 Constant 780
- 19.4.4 Natural Units 780
- 19.5.1 Direct Operands 781
- 19.5.2 Indirect Operands 781
- 19.5.4 Immediate Operands 782
- 19.6 EBC Instruction Syntax 783
- 19.7 Instruction Encoding 783
- 19.8 EBC Instruction Set 785
- SYNTAX: 786
- DESCRIPTION: 786
- OPERATION: 786
- BEHAVIORS AND RESTRICTIONS: 786
- DESCRIPTION 789
- BEHAVIOR AND RESTRICTIONS: 793
- OPERATION 822
- STORESP 832
- 19.9.1 Calling Outside VM 835
- 19.9.2 Calling Inside VM 835
- 19.9.3 Parameter Passing 835
- 19.9.4 Return Values 835
- 19.9.5 Binary Format 835
- EFI_EBC_PROTOCOL 837
- 19.12 EBC Tools 844
- 19.12.8 Function Returns 845
- 19.12.10 Thunking 846
- 19.12.11 EBC Linker 848
- 19.12.12 Image Loader 848
- 19.12.13 Debug Support 848
- 19.13 VM Exception Handling 849
- 19.14 Option ROM Formats 850
- Appendix A 851
- GUID and Time Formats 851
- A-2 12/01/02 Version 1.10 852
- Appendix B 853
- Console 853
- B.2 SIMPLE_TEXT_OUTPUT 854
- SIMPLE_TEXT_OUTPUT 855
- Version 1.10 12/01/02 B-4 856
- C.1 Example Computer System 857
- C.2 Legacy Floppy 858
- C.3 IDE Disk 859
- C.5 ACPI Terms 862
- Device Path Examples 863
- Version 1.10 12/01/02 C-7 863
- C-8 12/01/02 Version 1.10 864
- Appendix D 865
- Status Codes 865
- Appendix E 867
- 32/64-Bit UNDI Specification 867
- E.1.3 OS Network Stacks 871
- Pro Con 872
- E.2 Overview 873
- E.2.2 UNDI Command Format 879
- E.3 UNDI C Definitions 881
- E.3.1.3 PXE_BUSTYPE 882
- E.3.1.4 PXE_SWAP_UINT16 882
- E.3.1.5 PXE_SWAP_UINT32 883
- E.3.1.6 PXE_SWAP_UINT64 883
- E.3.2 Miscellaneous Macros 884
- E.3.2.1 Miscellaneous 884
- E.3.3 Portability Types 884
- E.3.3.1 PXE_CONST 884
- E.3.3.2 PXE_VOLATILE 884
- E.3.4 Simple Types 886
- E.3.4.1 PXE_BOOL 886
- E.3.4.2 PXE_OPCODE 886
- E.3.4.3 PXE_OPFLAGS 887
- E.3.4.4 PXE_STATFLAGS 892
- E.3.4.5 PXE_STATCODE 896
- E.3.4.6 PXE_IFNUM 896
- E.3.4.7 PXE_CONTROL 897
- E.3.4.8 PXE_FRAME_TYPE 897
- E.3.4.9 PXE_IPV4 897
- E.3.4.10 PXE_IPV6 897
- E.3.4.11 PXE_MAC_ADDR 897
- E.3.4.12 PXE_IFTYPE 898
- E.3.5 Compound Types 899
- E.3.5.1 PXE_HW_UNDI 899
- E.3.5.2 PXE_SW_UNDI 901
- E.3.5.3 PXE_UNDI 901
- E.3.5.4 PXE_CDB 902
- E.3.5.5 PXE_IP_ADDR 903
- E.3.5.6 PXE_DEVICE 903
- E.4 UNDI Commands 904
- Figure E-7. Linked CDBs 905
- Figure E-8. Queued CDBs 906
- E.4.2 Get State 907
- E.4.2.1 Issuing the Command 907
- E.4.3 Start 909
- E.4.3.1 Issuing the Command 909
- Preparing the CPB 910
- E.4.4 Stop 914
- E.4.4.1 Issuing the Command 914
- E.4.5 Get Init Info 915
- E.4.5.1 Issuing the Command 915
- StatFlags 916
- E.4.6 Get Config Info 919
- E.4.6.1 Issuing the Command 919
- E.4.7 Initialize 922
- E.4.7.1 Issuing the Command 922
- Before Using the DB 925
- E.4.8 Reset 926
- E.4.8.1 Issuing the Command 926
- E.4.9 Shutdown 928
- E.4.9.1 Issuing the Command 928
- E.4.10 Interrupt Enables 930
- E.4.11 Receive Filters 932
- E.4.12 Station Address 935
- E.4.13 Statistics 937
- E.4.14 MCast IP To MAC 940
- E.4.15 NvData 942
- Bulk NvData CPB 943
- E.4.16 Get Status 945
- Using the DB 947
- E.4.17 Fill Header 948
- Fragmented Frame 949
- E.4.18 Transmit 951
- OpFlags 952
- Nonfragmented Frame 952
- E.4.19 Receive 955
- Appendix F 959
- Appendix G 961
- G-4 12/01/02 Version 1.10 964
- Appendix H 965
- Compression Source Code 965
- Appendix I 993
- Decompression Source Code 993
- Appendix J 1009
- Opcode Summary 1009
- Appendix K 1011
- Alphabetic Function Lists 1011
- RegisterPeriodicCallback() 1016
- RegisterExceptionCallback() 1016
- References 1043
- ACPI Specification 1047
- WfM Specification 1047
- Glossary 1049
- Glossary 1051
- Index 1069
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