The default behavior for unaccepted memory is to accept all memory when ExitBootServices is called. An OS loader can use this protocol to disable this behavior to assume responsibility for memory acceptance and to affirm that the OS can handle the unaccepted memory type.
This is a candidate for standardization. Cc: Gerd Hoffmann <kra...@redhat.com> Cc: James Bottomley <j...@linux.ibm.com> Cc: Jiewen Yao <jiewen....@intel.com> Cc: Tom Lendacky <thomas.lenda...@amd.com> Cc: Ard Biesheuvel <a...@kernel.org> Cc: "Min M. Xu" <min.m...@intel.com> Cc: Andrew Fish <af...@apple.com> Cc: "Michael D. Kinney" <michael.d.kin...@intel.com> Signed-off-by: Dionna Glaze <dionnagl...@google.com> --- MdePkg/Include/Protocol/MemoryAcceptance.h | 40 ++++++++++++++++++++ MdePkg/MdePkg.dec | 3 ++ 2 files changed, 43 insertions(+) diff --git a/MdePkg/Include/Protocol/MemoryAcceptance.h b/MdePkg/Include/Protocol/MemoryAcceptance.h new file mode 100644 index 0000000000..0b305b016f --- /dev/null +++ b/MdePkg/Include/Protocol/MemoryAcceptance.h @@ -0,0 +1,40 @@ +/** @file + The file provides the protocol that disables the behavior that all memory + gets accepted at ExitBootServices(). This protocol is only meant to be called + by the OS loader, and not EDK2 itself. + + Copyright (c) 2022, Google LLC. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent +**/ + +#ifndef MEMORY_ACCEPTANCE_H_ +#define MEMORY_ACCEPTANCE_H_ + +#define BZ3987_MEMORY_ACCEPTANCE_PROTOCOL_GUID \ + {0xc5a010fe, \ + 0x38a7, \ + 0x4531, \ + {0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49}} + +typedef struct _BZ3987_MEMORY_ACCEPTANCE_PROTOCOL BZ3987_MEMORY_ACCEPTANCE_PROTOCOL; + +/** + @param This A pointer to a BZ3987_MEMORY_ACCEPTANCE_PROTOCOL. +**/ +typedef + EFI_STATUS +(EFIAPI *BZ3987_ALLOW_UNACCEPTED_MEMORY)( + IN BZ3987_MEMORY_ACCEPTANCE_PROTOCOL *This + ); + +/// +/// The BZ3987_MEMORY_ACCEPTANCE_PROTOCOL allows the OS loader to +/// indicate to EDK2 that ExitBootServices should not accept all memory. +/// +struct _BZ3987_MEMORY_ACCEPTANCE_PROTOCOL { + BZ3987_ALLOW_UNACCEPTED_MEMORY AllowUnacceptedMemory; +}; + +extern EFI_GUID gBz3987MemoryAcceptanceProtocolGuid; + +#endif diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec index 359a85ea10..5c639c1b98 100644 --- a/MdePkg/MdePkg.dec +++ b/MdePkg/MdePkg.dec @@ -1022,6 +1022,9 @@ gEfiPeiDelayedDispatchPpiGuid = { 0x869c711d, 0x649c, 0x44fe, { 0x8b, 0x9e, 0x2c, 0xbb, 0x29, 0x11, 0xc3, 0xe6 }} [Protocols] + ## Include/Protocol/Bz3987MemoryAcceptance.h + gBz3987MemoryAcceptanceProtocolGuid = { 0xc5a010fe, 0x38a7, 0x4531, {0x8a, 0x4a, 0x05, 0x00, 0xd2, 0xfd, 0x16, 0x49 }} + ## Include/Protocol/MemoryAccept.h gEdkiiMemoryAcceptProtocolGuid = { 0x38c74800, 0x5590, 0x4db4, { 0xa0, 0xf3, 0x67, 0x5d, 0x9b, 0x8e, 0x80, 0x26 }} -- 2.38.0.135.g90850a2211-goog -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#95529): https://edk2.groups.io/g/devel/message/95529 Mute This Topic: https://groups.io/mt/94544535/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-