mirror of https://github.com/acidanthera/audk.git
129 lines
5.4 KiB
C
129 lines
5.4 KiB
C
/** @file
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This protocol is used to prepare all information that is needed for the S3 resume boot path. This
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protocol is not required for all platforms.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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@par Revision Reference:
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This Protocol is defined in Framework of S3 Resume Boot Path Spec.
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Version 0.9.
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**/
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#ifndef _ACPI_S3_SAVE_PROTOCOL_H_
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#define _ACPI_S3_SAVE_PROTOCOL_H_
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//
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// Forward reference for pure ANSI compatability
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//
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typedef struct _EFI_ACPI_S3_SAVE_PROTOCOL EFI_ACPI_S3_SAVE_PROTOCOL;
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//
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// S3 Save Protocol GUID
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//
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#define EFI_ACPI_S3_SAVE_GUID \
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{ \
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0x125f2de1, 0xfb85, 0x440c, {0xa5, 0x4c, 0x4d, 0x99, 0x35, 0x8a, 0x8d, 0x38 } \
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}
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//
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// Protocol Data Structures
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//
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/**
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This function is used to:
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- Prepare all information that is needed in the S3 resume boot path. This information can include
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the following:
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-- Framework boot script table
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-- RSDT pointer
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-- Reserved memory for the S3 resume
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- Get the minimum legacy memory length (meaning below 1 MB) that is required for the S3 resume boot path.
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If LegacyMemoryAddress is NULL, the firmware will be unable to jump into a real-mode
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waking vector. However, it might still be able to jump into a flat-mode waking vector as long as the
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OS provides a flat-mode waking vector. It is the caller's responsibility to ensure the
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LegacyMemoryAddress is valid. If the LegacyMemoryAddress is higher than 1 MB,
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EFI_INVALID_PARAMETER will be returned.
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@param This A pointer to the EFI_ACPI_S3_SAVE_PROTOCOL instance.
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@param LegacyMemoryAddress The base of legacy memory.
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@retval EFI_SUCCESS All information was saved successfully.
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@retval EFI_INVALID_PARAMETER The memory range is not located below 1 MB.
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@retval EFI_OUT_OF_RESOURCES Resources were insufficient to save all the information.
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@retval EFI_NOT_FOUND Some necessary information cannot be found.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_ACPI_S3_SAVE)(
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IN EFI_ACPI_S3_SAVE_PROTOCOL * This,
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IN VOID * LegacyMemoryAddress
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);
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/**
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This function returns the size of the legacy memory (meaning below 1 MB) that is required during an S3
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resume. Before the Framework-based firmware transfers control to the OS, it has to transition from
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flat mode into real mode in case the OS supplies only a real-mode waking vector. This transition
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requires a certain amount of legacy memory. After getting the size of legacy memory
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below, the caller is responsible for allocating the legacy memory below 1 MB according to
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the size that is returned. The specific implementation of allocating the legacy memory is out of the
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scope of this specification.
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@param This A pointer to the EFI_ACPI_S3_SAVE_PROTOCOL instance.
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@param Size The returned size of legacy memory below 1MB.
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@retval EFI_SUCCESS Size was successfully returned.
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@retval EFI_INVALID_PARAMETER The pointer Size is NULL.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_ACPI_GET_LEGACY_MEMORY_SIZE)(
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IN EFI_ACPI_S3_SAVE_PROTOCOL * This,
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OUT UINTN * Size
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);
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/**
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The EFI_ACPI_S3_SAVE_PROTOCOL is responsible for preparing all the information that the
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Framework needs to restore the platform's preboot state during an S3 resume boot. This
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information can include the following:
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- The Framework boot script table, containing all necessary operations to initialize the platform.
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- ACPI table information, such as RSDT, through which the OS waking vector can be located.
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- The range of reserved memory that can be used on the S3 resume boot path.
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This protocol can be used after the Framework makes sure that the boot process is complete and
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that no hardware has been left unconfigured. Where to call this protocol to save information is implementation-specific.
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In the case of an EFI-aware OS, ExitBootServices() can be a choice to provide this hook.
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The currently executing EFI OS loader image calls ExitBootServices()to terminate all boot
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services. After ExitBootServices() successfully completes, the loader becomes responsible
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for the continued operation of the system.
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On a normal boot, ExitBootServices() checks if the platform supports S3 by looking for
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EFI_ACPI_S3_SAVE_PROTOCOL. If the protocol exists, ExitBootServices()will assume
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that the target platform supports an S3 resume and then call EFI_ACPI_S3_SAVE_PROTOCOL
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to save the S3 resume information. The entire Framework boot script table will then be generated,
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assuming the platform currently is in the preboot state.
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**/
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struct _EFI_ACPI_S3_SAVE_PROTOCOL {
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///
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/// Gets the size of legacy memory below 1 MB that is required for S3 resume.
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///
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EFI_ACPI_GET_LEGACY_MEMORY_SIZE GetLegacyMemorySize;
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///
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/// Prepare all information for an S3 resume.
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///
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EFI_ACPI_S3_SAVE S3Save;
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};
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extern EFI_GUID gEfiAcpiS3SaveProtocolGuid;
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#endif
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