Advanced Configuration and Power Interface Specification

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Bit Mnemonic Description System Address Map Interfaces 4-31 Reserved Reserved for future use. 15.2 E820 Assumptions and Limitations • The BIOS returns address ranges describing baseboard memory. • The BIOS does not return a range description for the memory mapping of PCI devices, ISA Option ROMs, and ISA Plug and Play cards because the OS has mechanisms available to detect them. • The BIOS returns chip set-defined address holes that are not being used by devices as reserved. • Address ranges defined for baseboard memory-mapped I/O devices, such as APICs, are returned as reserved. • All occurrences of the system BIOS are mapped as reserved, including the areas below 1 MB, at 16 MB (if present), and at end of the 4-GB address space. • Standard PC address ranges are not reported. For example, video memory at A0000 to BFFFF physical addresses are not described by this function. The range from E0000 to EFFFF is specific to the baseboard and is reported as it applies to that baseboard. • All of lower memory is reported as normal memory. The OS must handle standard RAM locations that are reserved for specific uses, such as the interrupt vector table (0:0) and the BIOS data area (40:0). 15.3 UEFI GetMemoryMap() Boot Services Function EFI enabled systems use the UEFI GetMemoryMap() boot services function to convey memory resources to the OS loader. These resources must then be conveyed by the OS loader to OSPM. The GetMemoryMap interface is only available at boot services time. It is not available as a run-time service after OSPM is loaded. The OS or its loader initiates the transition from boot services to runtime services by calling ExitBootServices(). After the call to ExitBootServices() all system memory map information must be derived from objects in the ACPI Namespace. The GetMemoryMap() interface returns an array of UEFI memory descriptors. These memory descriptors define a system memory map of all the installed RAM, and of physical memory ranges reserved by the firmware. Each descriptor contains a type field that dictates how the physical address range is to be treated by the operating system. The table below describes the memory types returned by the UEFI GetMemoryMap() interface along with a mapping from UEFI memory type to ACPI address range types. See the UEFI Specification for more information on UEFI memory types. Table 15-275 UEFI Memory Types and mapping to ACPI address range types Type Mnemonic Description ACPI Address Range Type 0 EfiReservedMemoryType Not used. AddressRangeReserved 608 Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba
Advanced Configuration and Power Interface Specification Type Mnemonic Description ACPI Address Range Type 1 EfiLoaderCode The Loader and/or OS may use this memory as they see fit. Note: the OS loader that called ExitBootServices() is executing out of one or more EfiLoaderCode sections. 2 EfiLoaderData The Loader and/or OS may use this memory as they see fit. Note: the OS loader that called ExitBootServices() is utilizing out of one or more EfiLoaderData sections. 15.4 UEFI Assumptions and Limitations AddressRangeMemory AddressRangeMemory 3 EfiBootServicesCode Memory available for general use. AddressRangeMemory 4 EfiBootServicesData Memory available for general use. AddressRangeMemory 5 EfiRuntimeServiceCode The OS and loader must preserve this memory range in the working and ACPI S1–S3 states. AddressRangeReserved 6 EfiRuntimeServicesData The OS and loader must preserve this memory range in the working and ACPI S1–S3 states. AddressRangeReserved 7 EfiConventionalMemory Memory available for general use. AddressRangeMemory 8 EfiUnusableMemory Memory that should not be used by the OS. For example, memory that failed UEFI memory test. AddressRangeReserved 9 EfiACPIReclainMemory The memory is to be preserved by the loader and OS until ACPI in enabled. Once ACPI is enabled, the memory in this range is available for general use. 10 EfiACPIMemoryNVS The OS and loader must preserve this memory range in the working and ACPI S1–S3 states. 11 EfiMemoryMappedIO The OS does not use this memory. All system memory-mapped I/O port space information should come from ACPI tables. 12 EfiMemoryMappedIOPort Space The OS does not use this memory. All system memory-mapped I/O port space information should come from ACPI tables. 13 EfiPalCode The OS and loader must preserve this memory range in the working and ACPI S1–S3 states. AddressRangeACPI AddressRangeNVS AddressRangeReserved AddressRangeReserved AddressRangeReserved • The firmware returns address ranges describing the current system memory configuration. Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba 609
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Field Byte Length Advanced Configur
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FACP - Flag Bit Length Advanced Con
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Field X Firmware Waking Vector Adva
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Table 5-81 MPST Table Structure 5.2
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MEMORY_POWER _STATUS_REGIST ER Adva
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Table 5-87 Flag format Advanced Con
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Table 5-93 Socket Structure Advance
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Root R \_PR P \PID0 \_SB d CPU0 _ST
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Hex value Description Advanced Conf
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Arguments: (1) Advanced Configurati
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5.7.5 _DLM (DeviceLock Mutex) Advan
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Return Value: None Advanced Configu
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6.1.2 _CID (Compatible ID) Advanced
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Device(BUS0) { } Advanced Configura
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Example: Advanced Configuration and
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Status Code Description 0xA0-0xFFFF
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Arguments: None Return Value: Advan
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Offset Field Name Advanced Configur
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6.4.2.7 Fixed DMA Descriptor Advanc
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Byte 3 Interrupt Vector Flags Advan
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Byte 11 Byte 12 Byte 13 Byte 14 Adv
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6.5.7 _GLK (Global Lock) Advanced C
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7.1.3 _ON Advanced Configuration an
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Object Description Advanced Configu
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8.4 Declaring Processors Advanced C
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} Advanced Configuration and Power
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Example Advanced Configuration and
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8.4.3.5 _TDL (T-state Depth Limit)
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Element Object Type Counter Wraparo
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} }) Advanced Configuration and Pow
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8.5.2 OSPM _OST Evaluation Advanced
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9.2.1 Overview Advanced Configurati
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Return Value: Advanced Configuratio
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} } } }) Advanced Configuration and
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9.12.4 Example: Memory Device Scope
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Host Interface Advanced Configurati
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10.2.1 Battery Events Advanced Conf
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10.2.2.9 _BCT (Battery Charge Time)
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1 - On-line Advanced Configuration
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Object Description Advanced Configu
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11.1.5 Passive Cooling Advanced Con
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} Advanced Configuration and Power
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External(\_SB.CPU1, DeviceObj) Adva
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Result // Target� ) => Integer Ad
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) DebugTerm :=� Debug Advanced Co
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) Advanced Configuration and Power
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Result // Target� ) => Advanced
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Transfer8 | Transfer16 | Transfer8_
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To convert from an object of this D
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Name (CNT, 5) Store (CNT, Local0) A
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DefSleep := SleepOp MsecTime SleepO
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\ S0 S1 MEM MEM CPU SET GET SET GET
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Symbols _EJx 301 A AC adapter devic
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D1 Device State definition 27 trans
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EFI definition 19 GetMemoryMap inte
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definition 20 events 20 registers 2
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hung systems 75, 76 hysteresis 522
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Notification Temperature Threshold
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implementation requirements 10 pass
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performance states 43 performance v
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estoring system context 619 results
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commands, restricted 580 data buffe
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throttling 387, 400 THT_EN 90 Timer
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Advanced Configuration and Power Interface Specification

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