Use a register to save PeiServiceTable pointer. This Library provides PeiServiceTable pointer saveing and retrieval serivces.
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584 Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org> Cc: Jiewen Yao <jiewen....@intel.com> Cc: Jordan Justen <jordan.l.jus...@intel.com> Cc: Gerd Hoffmann <kra...@redhat.com> Signed-off-by: Chao Li <lic...@loongson.cn> Co-authored-by: Xianglai Li <lixiang...@loongson.cn> Co-authored-by: Bibo Mao <maob...@loongson.cn> --- .../PeiServicesTablePointer.c | 75 +++++++++++++++++++ .../PeiServicesTablePointerLib.inf | 31 ++++++++ 2 files changed, 106 insertions(+) create mode 100644 OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c create mode 100644 OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf diff --git a/OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c b/OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c new file mode 100644 index 0000000000..dcbcb50131 --- /dev/null +++ b/OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c @@ -0,0 +1,75 @@ +/** @file + PEI Services Table Pointer Library. + + Copyright (c) 2023 Loongson Technology Corporation Limited. All rights reserved.<BR> + + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include <PiPei.h> +#include <Library/PeiServicesTablePointerLib.h> +#include <Library/DebugLib.h> +#include <Library/BaseLib.h> +#include <Register/LoongArch64/Csr.h> + +/** + Caches a pointer PEI Services Table. + + Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer + in a platform specific manner. + + If PeiServicesTablePointer is NULL, then ASSERT (). + + @param PeiServicesTablePointer The address of PeiServices pointer. +**/ +VOID +EFIAPI +SetPeiServicesTablePointer ( + IN CONST EFI_PEI_SERVICES **PeiServicesTablePointer + ) +{ + CsrWrite (LOONGARCH_CSR_KS0, (UINTN)PeiServicesTablePointer); +} + +/** + Retrieves the cached value of the PEI Services Table pointer. + + Returns the cached value of the PEI Services Table pointer in a CPU specific manner + as specified in the CPU binding section of the Platform Initialization Pre-EFI + Initialization Core Interface Specification. + + If the cached PEI Services Table pointer is NULL, then ASSERT (). + + @return The pointer to PeiServices. +**/ +CONST EFI_PEI_SERVICES ** +EFIAPI +GetPeiServicesTablePointer ( + VOID + ) +{ + return (CONST EFI_PEI_SERVICES **)(CsrRead (LOONGARCH_CSR_KS0)); +} + +/** +Perform CPU specific actions required to migrate the PEI Services Table +pointer from temporary RAM to permanent RAM. + +For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes +immediately preceding the Interrupt Descriptor Table (IDT) in memory. +For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes +immediately preceding the Interrupt Descriptor Table (IDT) in memory. +For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in +a dedicated CPU register. This means that there is no memory storage +associated with storing the PEI Services Table pointer, so no additional +migration actions are required for Itanium or ARM CPUs. +**/ +VOID +EFIAPI +MigratePeiServicesTablePointer ( + VOID + ) +{ + return; +} diff --git a/OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf b/OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf new file mode 100644 index 0000000000..274cb2f781 --- /dev/null +++ b/OvmfPkg/LoongArchVirt/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf @@ -0,0 +1,31 @@ +## @file +# PEI Services Table Pointer Library. +# +# Copyright (c) 2023 Loongson Technology Corporation Limited. All rights reserved.<BR> +# +# SPDX-License-Identifier: BSD-2-Clause-Patent +# +## +[Defines] + INF_VERSION = 0x00010005 + BASE_NAME = PeiServicesTablePointerLib + FILE_GUID = 098B0DB0-AD01-8886-D409-90CBC7E89154 + MODULE_TYPE = PEIM + VERSION_STRING = 1.0 + LIBRARY_CLASS = PeiServicesTablePointerLib|PEIM PEI_CORE SEC + +# +# VALID_ARCHITECTURES = LOONGARCH64 +# + +[Sources] + PeiServicesTablePointer.c + +[Packages] + MdePkg/MdePkg.dec + +[LibraryClasses] + BaseLib + DebugLib + +[Pcd] -- 2.27.0 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#110541): https://edk2.groups.io/g/devel/message/110541 Mute This Topic: https://groups.io/mt/102342297/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
