On 11/6/23 04:30, Chao Li wrote:
> 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
Why is this under OvmfPkg?
Laszlo
>
> 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]
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