mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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387 lines
11 KiB
C
387 lines
11 KiB
C
/** @file
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Apple RAM Disk protocol.
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Copyright (C) 2019, vit9696. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. 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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**/
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#ifndef APPLE_RAM_DISK_PROTOCOL_H
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#define APPLE_RAM_DISK_PROTOCOL_H
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#include <Library/DebugLib.h>
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#include <Protocol/BlockIo.h>
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#include <Protocol/DevicePath.h>
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/**
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Apple RAM Disk protocol GUID.
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957932CC-7E8E-433B-8F41-D391EA3C10F8
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**/
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#define APPLE_RAM_DISK_PROTOCOL_GUID \
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{ 0x957932CC, 0x7E8E, 0x433B, \
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{ 0x8F, 0x41, 0xD3, 0x91, 0xEA, 0x3C, 0x10, 0xF8 } }
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/**
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Apple RAM Disk protocol revision.
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**/
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#define APPLE_DMG_BOOT_PROTOCOL_REVISION 3
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/**
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RAM Disk extent signature, "RAMDXTNT".
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**/
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#define APPLE_RAM_DISK_EXTENT_SIGNATURE 0x544E5458444D4152ULL
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/**
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RAM Disk extent version.
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**/
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#define APPLE_RAM_DISK_EXTENT_VERSION 0x10000U
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/**
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RAM Disk maximum extent count.
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**/
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#define APPLE_RAM_DISK_MAX_EXTENTS 0xFE
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#pragma pack(push, 1)
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/**
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RAM Disk extent.
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When automatically allocating at RAM disk creation, extents are created
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on demand as long as contiguous memory is found in the firmware.
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Please note, that this must match IOAddressRange type in XNU,
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which can be found in iokit/IOKit/IOTypes.h.
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**/
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typedef PACKED struct {
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///
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/// Extentent address pointing to a sequence of allocated pages from
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/// EfiACPIMemoryNVS or EfiBootServicesData depending on RamDisk init.
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///
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UINT64 Start;
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///
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/// Actual size of the extent. Allocated area size may be >= Length.
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///
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UINT64 Length;
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} APPLE_RAM_DISK_EXTENT;
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/**
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RAM Disk externally accessible header containing references to extents.
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**/
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typedef PACKED struct {
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///
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/// Set to APPLE_RAM_DISK_EXTENT_SIGNATURE.
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///
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UINT64 Signature;
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///
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/// Set to APPLE_RAM_DISK_EXTENT_VERSION.
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///
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UINT32 Version;
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///
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/// Externally visible amount of extents.
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///
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UINT32 ExtentCount;
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///
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/// Externally visible extent array.
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///
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APPLE_RAM_DISK_EXTENT Extents[APPLE_RAM_DISK_MAX_EXTENTS];
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///
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/// Currently reserved or rather unknown.
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///
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UINT64 Reserved;
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///
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/// Set to APPLE_RAM_DISK_EXTENT_SIGNATURE.
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///
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UINT64 Signature2;
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} APPLE_RAM_DISK_EXTENT_TABLE;
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/**
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RAM Disk protocol context. This might be called scatter pool.
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**/
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typedef PACKED struct {
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///
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/// Internally visible amount of extents.
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///
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UINT64 ExtentCount;
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///
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/// Currently reserved or rather unknown. Padding?
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///
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UINT64 Reserved1;
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///
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/// Total addressible disk size specified at creation.
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///
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UINT64 DiskSize;
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///
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/// Internally visible extent array.
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///
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APPLE_RAM_DISK_EXTENT Extents[APPLE_RAM_DISK_MAX_EXTENTS];
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///
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/// Currently reserved or rather unknown. Padding?
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///
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UINT64 Reserved2;
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///
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/// Normal extent table.
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///
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APPLE_RAM_DISK_EXTENT_TABLE ExtentTable;
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///
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/// More data may follow, for Apple implementation it will be 0x9FD000 bytes.
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/// (This struct and 1 page for internal header.)
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///
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} APPLE_RAM_DISK_CONTEXT;
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/**
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RAM Disk vendor device path, 24 bytes in total.
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**/
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typedef PACKED struct {
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///
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/// Vendor device path.
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/// Type = HARDWARE_DEVICE_PATH.
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/// Subtype = HW_VENDOR_DP.
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/// Length = sizeof (VENDOR_DEVICE_PATH) + sizeof (UINT32).
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/// Guid = APPLE_RAM_DISK_PROTOCOL_GUID.
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///
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VENDOR_DEVICE_PATH Vendor;
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///
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/// Globally incremented counter to make every path unique.
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///
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UINT32 Counter;
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} APPLE_RAM_DISK_DP_VENDOR;
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/**
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RAM Disk device path header for endpoint devices.
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**/
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typedef PACKED struct {
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///
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/// Vendor device path.
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///
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APPLE_RAM_DISK_DP_VENDOR Vendor;
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///
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/// Memmap device path.
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///
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MEMMAP_DEVICE_PATH MemMap;
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} APPLE_RAM_DISK_DP_HEADER;
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/**
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RAM Disk device path, 52 bytes in total.
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**/
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typedef PACKED struct {
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///
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/// Vendor device path with APPLE_RAM_DISK_PROTOCOL_GUID.
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/// Type = HARDWARE_DEVICE_PATH.
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/// Subtype = HW_MEMMAP_DP.
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/// Length = sizeof (APPLE_RAM_DISK_ENTRY_DP).
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/// StartingAddresss = APPLE_RAM_DISK_EXTENT_TABLE pointer.
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/// EndingAddress = StartingAddresss + sizeof (APPLE_RAM_DISK_EXTENT_TABLE).
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/// MemoryType = EfiACPIMemoryNVS or EfiBootServicesData as allocated.
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///
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/// Note: EndingAddress, per UEFI specification and edk2 implementation, is supposed
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/// to be the top usable address, not the top of the buffer. Perhaps there is a mistake here.
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///
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APPLE_RAM_DISK_DP_VENDOR Vendor;
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///
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/// Memmap device path.
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///
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MEMMAP_DEVICE_PATH MemMap;
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///
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/// Device path end.
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///
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EFI_DEVICE_PATH_PROTOCOL End;
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} APPLE_RAM_DISK_DP;
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#pragma pack(pop)
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/**
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Create new RAM disk providing relevant protocols:
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- gEfiDevicePathProtocolGuid
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- gEfiBlockIoProtocolGuid
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- gAppleRamDiskProtocolGuid (as NULL)
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When AllocateMemory is TRUE, a writeable RAM disk is created.
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Its contents are initially zeroed, and then may be modified through normal writing
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and via RAM Disk context, which is accessible through GetRamDiskContext.
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When AllocateMemory is FALSE, a read only RAM disk is created.
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Its contents are not allocated but reported to be all zero.
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MemMap StartingAddresss will be 0 and EndingAddress will be sizeof (APPLE_RAM_DISK_EXTENT_TABLE).
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Vit: Since no context is allocated, there is no way to initialise this disk image except in an
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implementatation specific way. AllocateMemory = FALSE is never used, so it may be a bug.
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@param[in] BlockCount Block amount, ignored if AllocateMemory is FALSE.
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@param[in] BlockSize Block size, ignored if AllocateMemory is FALSE.
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@param[in] AllocateMemory Allocate disk memory.
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@param[in] ReserveMemory Mark memory as EfiACPIMemoryNVS, otherwise EfiBootServicesData.
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@param[in] Handle Resulting handle.
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@retval EFI_SUCCESS RAM disk was successfully created.
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@retval EFI_OUT_OF_RESOURCES Requested RAM disk of more than SIZE_16TB.
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@retval EFI_OUT_OF_RESOURCES Memory allocation error happened.
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@retval EFI_INVALID_PARAMETER Too many extents are needed for the allocation.
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@retval EFI_BUFFER_TOO_SMALL Not enough extents to allocate context extent.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *APPLE_RAM_DISK_CREATE) (
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IN UINT64 BlockCount OPTIONAL,
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IN UINT32 BlockSize OPTIONAL,
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IN BOOLEAN AllocateMemory,
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IN BOOLEAN ReserveMemory,
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OUT EFI_HANDLE *Handle
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);
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/**
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Destroy RAM disk freeing resources and uninstalling relevant protocols:
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- gEfiDevicePathProtocolGuid
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- gEfiBlockIoProtocolGuid
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- gAppleRamDiskProtocolGuid
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- gTDMApprovedGuid
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@param[in] Handle RAM disk handle.
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@retval EFI_INVALID_PARAMETER Not a RAM disk handle.
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@retval EFI_NOT_FOUND Missing Block I/O protocol.
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@retval EFI_SUCCESS Destroyed successfully.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *APPLE_RAM_DISK_DESTROY) (
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IN EFI_HANDLE Handle
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);
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/**
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Obtain RAM disk context. Context exists only for "allocated" RAM disks,
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i.e. disks created with AllocateMemory = TRUE. When an unallocated
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RAM disk is created, NULL Context will be returned.
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@param[in] Handle RAM disk handle.
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@param[out] Context RAM disk context.
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@retval EFI_INVALID_PARAMETER Not a RAM disk handle.
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@retval EFI_NOT_FOUND Missing Block I/O protocol.
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@retval EFI_SUCCESS Obtained NULL or non-NULL context successfully.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *APPLE_RAM_DISK_GET_CONTEXT) (
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IN EFI_HANDLE Handle,
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OUT APPLE_RAM_DISK_CONTEXT *Context
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);
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/**
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Apple RAM Disk protocol.
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**/
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typedef struct {
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UINT64 Revision;
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APPLE_RAM_DISK_CREATE CreateRamDisk;
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APPLE_RAM_DISK_DESTROY DestroyRamDisk;
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APPLE_RAM_DISK_GET_CONTEXT GetRamDiskContext;
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} APPLE_RAM_DISK_PROTOCOL;
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/*
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STATIC_ASSERT (sizeof (APPLE_RAM_DISK_DP_VENDOR) == 24, "Invalid APPLE_RAM_DISK_DP_VENDOR size");
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STATIC_ASSERT (sizeof (APPLE_RAM_DISK_DP) == 52, "Invalid APPLE_RAM_DISK_DP size");
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STATIC_ASSERT (sizeof (APPLE_RAM_DISK_EXTENT) == 16, "Invalid APPLE_RAM_DISK_EXTENT size");
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STATIC_ASSERT (sizeof (APPLE_RAM_DISK_EXTENT_TABLE) == 4096, "Invalid APPLE_RAM_DISK_EXTENT_TABLE size");
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STATIC_ASSERT (sizeof (APPLE_RAM_DISK_CONTEXT) == 8192, "Invalid APPLE_RAM_DISK_CONTEXT size");
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*/
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extern EFI_GUID gAppleRamDiskProtocolGuid;
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/**
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Vit: Below come the implementation specific details, which probably do not belong here.
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Since this is the only way to initialize RAM disk when it was not allocated at creation time,
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I put it here for now.
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**/
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/**
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RAM Disk instance signature, "RAMD".
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**/
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#define APPLE_RAM_DISK_INSTANCE_SIGNATURE 0x444D4152U
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/**
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RAM Disk default size.
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This value is used when allocating APPLE_RAM_DISK structure.
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**/
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#define APPLE_RAM_DISK_DEFAULT_SIZE 0xA00000U
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/**
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RAM Disk outermost structure. Allocated in pages with matching MemoryType.
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**/
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typedef struct {
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///
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/// Amount of allocated extents in the RAM disk.
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///
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UINT64 AllocatedExtents;
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///
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/// Amount of allocated pages in APPLE_RAM_DISK structure.
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/// Normally EFI_SIZE_TO_PAGES (APPLE_RAM_DISK_DEFAULT_SIZE).
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///
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UINT64 PageCount;
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///
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/// Total disk size allocated from memory map.
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/// It is bigger by sizeof(APPLE_RAM_DISK_CONTEXT) than actual requested size,
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/// when AllocateMemory = TRUE is specified.
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///
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UINT64 TotalSize;
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///
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/// All allocated and owned extents.
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/// First extent is special, as it points to OwnExtentData, and thus
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/// has APPLE_RAM_DISK_DEFAULT_SIZE - sizeof (APPLE_RAM_DISK) bytes.
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///
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APPLE_RAM_DISK_EXTENT Extents[APPLE_RAM_DISK_MAX_EXTENTS];
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///
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/// Currently reserved or rather unknown. Padding?
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///
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UINT64 Reserved;
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///
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/// Own extent data lasting till PageCount end.
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///
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UINT8 OwnExtentData[];
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} APPLE_RAM_DISK;
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/**
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Apple RAM Disk instance structure.
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**/
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typedef struct {
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///
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/// Set to APPLE_RAM_DISK_INSTANCE_SIGNATURE.
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///
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UINT32 Magic;
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///
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/// Set to RAM disk handle, formerly returned with CreateRamDisk.
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///
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EFI_HANDLE Handle;
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///
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/// RAM disk device path.
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///
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EFI_DEVICE_PATH_PROTOCOL *DevicePath;
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///
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/// RAM disk Block I/O protocol.
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///
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EFI_BLOCK_IO_PROTOCOL BlockIo;
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///
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/// Outer RAM disk structure, which owns all allocated extents.
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/// This field is NULL when AllocateMemory = FALSE.
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///
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APPLE_RAM_DISK *RamDisk;
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///
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/// RAM disk context allocated within RAM disk structure memory.
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/// Apple implementation puts it to the end of RamDisk structure.
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/// This field is NULL when AllocateMemory = FALSE.
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///
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APPLE_RAM_DISK_CONTEXT *Context;
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///
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/// Extra pointer to Context->Extents.
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/// This field is NULL when AllocateMemory = FALSE.
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///
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APPLE_RAM_DISK_EXTENT_TABLE *Extents;
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///
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/// Total addressible disk size specified at creation.
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/// This field is -1 when AllocateMemory = FALSE.
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///
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INT64 DiskSize;
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} APPLE_RAM_DISK_INSTANCE;
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#endif // APPLE_RAM_DISK_PROTOCOL_H
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