REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
This library is required to make SBI ecalls from the S-mode EDK2.
This is mostly copied from
edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVEdk2SbiLib
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
---
MdePkg/MdePkg.dec | 4 +
MdePkg/MdePkg.dsc | 3 +
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf | 25 +++
MdePkg/Include/Library/BaseRiscVSbiLib.h | 127 +++++++++++
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 227 ++++++++++++++++++++
5 files changed, 386 insertions(+)
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 3d08f20d15b0..ca2e4dcf815c 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -316,6 +316,10 @@ [LibraryClasses.IA32, LibraryClasses.X64]
## @libraryclass Provides function to support TDX processing.
TdxLib|Include/Library/TdxLib.h
+[LibraryClasses.RISCV64]
+ ## @libraryclass Provides function to make ecalls to SBI
+ BaseRiscVSbiLib|Include/Library/BaseRiscVSbiLib.h
+
[Guids]
#
# GUID defined in UEFI2.1/UEFI2.0/EFI1.1
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 32a852dc466e..0ac7618b4623 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -190,4 +190,7 @@ [Components.ARM, Components.AARCH64]
MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsicArmVirt.inf
MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
+[Components.RISCV64]
+ MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
+
[BuildOptions]
diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
new file mode 100644
index 000000000000..d03132bf01c1
--- /dev/null
+++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
@@ -0,0 +1,25 @@
+## @file
+# RISC-V Library to call SBI ecalls
+#
+# Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001b
+ BASE_NAME = BaseRiscVSbiLib
+ FILE_GUID = D742CF3D-E600-4009-8FB5-318073008508
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = RiscVSbiLib
+
+[Sources]
+ BaseRiscVSbiLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ BaseLib
diff --git a/MdePkg/Include/Library/BaseRiscVSbiLib.h b/MdePkg/Include/Library/BaseRiscVSbiLib.h
new file mode 100644
index 000000000000..3a3cbfb879f1
--- /dev/null
+++ b/MdePkg/Include/Library/BaseRiscVSbiLib.h
@@ -0,0 +1,127 @@
+/** @file
+ Library to call the RISC-V SBI ecalls
+
+ Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ @par Glossary:
+ - Hart - Hardware Thread, similar to a CPU core
+
+ Currently, EDK2 needs to call SBI only to set the time and to do system reset.
+
+**/
+
+#ifndef RISCV_SBI_LIB_H_
+#define RISCV_SBI_LIB_H_
+
+#include <Uefi.h>
+
+/* SBI Extension IDs */
+#define SBI_EXT_TIME 0x54494D45
+#define SBI_EXT_SRST 0x53525354
+
+/* SBI function IDs for TIME extension*/
+#define SBI_EXT_TIME_SET_TIMER 0x0
+
+/* SBI function IDs for SRST extension */
+#define SBI_EXT_SRST_RESET 0x0
+
+#define SBI_SRST_RESET_TYPE_SHUTDOWN 0x0
+#define SBI_SRST_RESET_TYPE_COLD_REBOOT 0x1
+#define SBI_SRST_RESET_TYPE_WARM_REBOOT 0x2
+
+#define SBI_SRST_RESET_REASON_NONE 0x0
+#define SBI_SRST_RESET_REASON_SYSFAIL 0x1
+
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILED -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+
+#define SBI_LAST_ERR SBI_ERR_ALREADY_STOPPED
+
+typedef struct {
+ UINT64 BootHartId;
+ VOID *PeiServiceTable; // PEI Service table
+ VOID *PrePiHobList; // Pre PI Hob List
+ UINT64 FlattenedDeviceTree; // Pointer to Flattened Device tree
+} EFI_RISCV_FIRMWARE_CONTEXT;
+
+//
+// EDK2 OpenSBI firmware extension return status.
+//
+typedef struct {
+ UINTN Error; ///< SBI status code
+ UINTN Value; ///< Value returned
+} SBI_RET;
+
+VOID
+EFIAPI
+SbiSetTimer (
+ IN UINT64 Time
+ );
+
+EFI_STATUS
+EFIAPI
+SbiSystemReset (
+ IN UINTN ResetType,
+ IN UINTN ResetReason
+ );
+
+/**
+ Get firmware context of the calling hart.
+
+ @param[out] FirmwareContext The firmware context pointer.
+**/
+VOID
+EFIAPI
+GetFirmwareContext (
+ OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
+ );
+
+/**
+ Set firmware context of the calling hart.
+
+ @param[in] FirmwareContext The firmware context pointer.
+**/
+VOID
+EFIAPI
+SetFirmwareContext (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
+ );
+
+/**
+ Get pointer to OpenSBI Firmware Context
+
+ Get the pointer of firmware context.
+
+ @param FirmwareContextPtr Pointer to retrieve pointer to the
+ Firmware Context.
+**/
+VOID
+EFIAPI
+GetFirmwareContextPointer (
+ IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
+ );
+
+/**
+ Set pointer to OpenSBI Firmware Context
+
+ Set the pointer of firmware context.
+
+ @param FirmwareContextPtr Pointer to Firmware Context.
+**/
+VOID
+EFIAPI
+SetFirmwareContextPointer (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
+ );
+
+#endif
diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
new file mode 100644
index 000000000000..15222a528753
--- /dev/null
+++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
@@ -0,0 +1,227 @@
+/** @file
+ Instance of the SBI ecall library.
+
+ It allows calling an SBI function via an ecall from S-Mode.
+
+ Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+//
+// Maximum arguments for SBI ecall
+#define SBI_CALL_MAX_ARGS 6
+
+/**
+ Call SBI call using ecall instruction.
+
+ Asserts when NumArgs exceeds SBI_CALL_MAX_ARGS.
+
+ @param[in] ExtId SBI extension ID.
+ @param[in] FuncId SBI function ID.
+ @param[in] NumArgs Number of arguments to pass to the ecall.
+ @param[in] ... Argument list for the ecall.
+
+ @retval Returns SBI_RET structure with value and error code.
+
+**/
+STATIC
+SBI_RET
+EFIAPI
+SbiCall (
+ IN UINTN ExtId,
+ IN UINTN FuncId,
+ IN UINTN NumArgs,
+ ...
+ )
+{
+ UINTN I;
+ SBI_RET Ret;
+ UINTN Args[SBI_CALL_MAX_ARGS];
+ VA_LIST ArgList;
+
+ VA_START (ArgList, NumArgs);
+
+ if (NumArgs > SBI_CALL_MAX_ARGS) {
+ Ret.Error = SBI_ERR_INVALID_PARAM;
+ Ret.Value = -1;
+ return Ret;
+ }
+
+ for (I = 0; I < SBI_CALL_MAX_ARGS; I++) {
+ if (I < NumArgs) {
+ Args[I] = VA_ARG (ArgList, UINTN);
+ } else {
+ // Default to 0 for all arguments that are not given
+ Args[I] = 0;
+ }
+ }
+
+ VA_END (ArgList);
+
+ register UINTN a0 asm ("a0") = Args[0];
+ register UINTN a1 asm ("a1") = Args[1];
+ register UINTN a2 asm ("a2") = Args[2];
+ register UINTN a3 asm ("a3") = Args[3];
+ register UINTN a4 asm ("a4") = Args[4];
+ register UINTN a5 asm ("a5") = Args[5];
+ register UINTN a6 asm ("a6") = (UINTN)(FuncId);
+ register UINTN a7 asm ("a7") = (UINTN)(ExtId);
+
+ asm volatile ("ecall" \
+ : "+r" (a0), "+r" (a1) \
+ : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) \
+ : "memory"); \
+ Ret.Error = a0;
+ Ret.Value = a1;
+ return Ret;
+}
+
+/**
+ Translate SBI error code to EFI status.
+
+ @param[in] SbiError SBI error code
+ @retval EFI_STATUS
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+TranslateError (
+ IN UINTN SbiError
+ )
+{
+ switch (SbiError) {
+ case SBI_SUCCESS:
+ return EFI_SUCCESS;
+ case SBI_ERR_FAILED:
+ return EFI_DEVICE_ERROR;
+ break;
+ case SBI_ERR_NOT_SUPPORTED:
+ return EFI_UNSUPPORTED;
+ break;
+ case SBI_ERR_INVALID_PARAM:
+ return EFI_INVALID_PARAMETER;
+ break;
+ case SBI_ERR_DENIED:
+ return EFI_ACCESS_DENIED;
+ break;
+ case SBI_ERR_INVALID_ADDRESS:
+ return EFI_LOAD_ERROR;
+ break;
+ case SBI_ERR_ALREADY_AVAILABLE:
+ return EFI_ALREADY_STARTED;
+ break;
+ default:
+ //
+ // Reaches here only if SBI has defined a new error type
+ //
+ ASSERT (FALSE);
+ return EFI_UNSUPPORTED;
+ break;
+ }
+}
+
+/**
+ Clear pending timer interrupt bit and set timer for next event after Time.
+
+ To clear the timer without scheduling a timer event, set Time to a
+ practically infinite value or mask the timer interrupt by clearing sie.STIE.
+
+ @param[in] Time The time offset to the next scheduled timer interrupt.
+**/
+VOID
+EFIAPI
+SbiSetTimer (
+ IN UINT64 Time
+ )
+{
+ SbiCall (SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, 1, Time);
+}
+
+EFI_STATUS
+EFIAPI
+SbiSystemReset (
+ IN UINTN ResetType,
+ IN UINTN ResetReason
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (
+ SBI_EXT_SRST,
+ SBI_EXT_SRST_RESET,
+ 2,
+ ResetType,
+ ResetReason
+ );
+
+ return TranslateError (Ret.Error);
+}
+
+/**
+ Get firmware context of the calling hart.
+
+ @param[out] FirmwareContext The firmware context pointer.
+ @retval EFI_SUCCESS The operation succeeds.
+**/
+VOID
+EFIAPI
+GetFirmwareContext (
+ OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
+ )
+{
+ *FirmwareContext = (EFI_RISCV_FIRMWARE_CONTEXT *)RiscVGetSupervisorScratch ();
+}
+
+/**
+ Set firmware context of the calling hart.
+
+ @param[in] FirmwareContext The firmware context pointer.
+**/
+VOID
+EFIAPI
+SetFirmwareContext (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
+ )
+{
+ RiscVSetSupervisorScratch ((UINT64)FirmwareContext);
+}
+
+/**
+ Get pointer to OpenSBI Firmware Context
+
+ Get the pointer of firmware context through OpenSBI FW Extension SBI.
+
+ @param FirmwareContextPtr Pointer to retrieve pointer to the
+ Firmware Context.
+**/
+VOID
+EFIAPI
+GetFirmwareContextPointer (
+ IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
+ )
+{
+ GetFirmwareContext (FirmwareContextPtr);
+}
+
+/**
+ Set the pointer to OpenSBI Firmware Context
+
+ Set the pointer of firmware context through OpenSBI FW Extension SBI.
+
+ @param FirmwareContextPtr Pointer to Firmware Context.
+**/
+VOID
+EFIAPI
+SetFirmwareContextPointer (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
+ )
+{
+ SetFirmwareContext (FirmwareContextPtr);
+}
--
2.38.0
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-=-=-=-=-=-=-=-=-=-=-=-One comment below.
Mike
> -----Original Message-----
> From: Sunil V L <sunilvl@ventanamicro.com>
> Sent: Saturday, January 28, 2023 11:18 AM
> To: devel@edk2.groups.io
> Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>;
> Abner Chang <abner.chang@amd.com>
> Subject: [edk2-staging/RiscV64QemuVirt PATCH V7 03/20] MdePkg: Add BaseRiscVSbiLib Library for RISC-V
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
>
> This library is required to make SBI ecalls from the S-mode EDK2.
> This is mostly copied from
> edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVEdk2SbiLib
>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Cc: Zhiguang Liu <zhiguang.liu@intel.com>
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Abner Chang <abner.chang@amd.com>
> ---
> MdePkg/MdePkg.dec | 4 +
> MdePkg/MdePkg.dsc | 3 +
> MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf | 25 +++
> MdePkg/Include/Library/BaseRiscVSbiLib.h | 127 +++++++++++
> MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 227 ++++++++++++++++++++
> 5 files changed, 386 insertions(+)
>
> diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
> index 3d08f20d15b0..ca2e4dcf815c 100644
> --- a/MdePkg/MdePkg.dec
> +++ b/MdePkg/MdePkg.dec
> @@ -316,6 +316,10 @@ [LibraryClasses.IA32, LibraryClasses.X64]
> ## @libraryclass Provides function to support TDX processing.
> TdxLib|Include/Library/TdxLib.h
>
> +[LibraryClasses.RISCV64]
> + ## @libraryclass Provides function to make ecalls to SBI
> + BaseRiscVSbiLib|Include/Library/BaseRiscVSbiLib.h
> +
> [Guids]
> #
> # GUID defined in UEFI2.1/UEFI2.0/EFI1.1
> diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
> index 32a852dc466e..0ac7618b4623 100644
> --- a/MdePkg/MdePkg.dsc
> +++ b/MdePkg/MdePkg.dsc
> @@ -190,4 +190,7 @@ [Components.ARM, Components.AARCH64]
> MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsicArmVirt.inf
> MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
>
> +[Components.RISCV64]
> + MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> +
> [BuildOptions]
> diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> new file mode 100644
> index 000000000000..d03132bf01c1
> --- /dev/null
> +++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> @@ -0,0 +1,25 @@
> +## @file
> +# RISC-V Library to call SBI ecalls
> +#
> +# Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> + INF_VERSION = 0x0001001b
> + BASE_NAME = BaseRiscVSbiLib
> + FILE_GUID = D742CF3D-E600-4009-8FB5-318073008508
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = RiscVSbiLib
> +
> +[Sources]
> + BaseRiscVSbiLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> diff --git a/MdePkg/Include/Library/BaseRiscVSbiLib.h b/MdePkg/Include/Library/BaseRiscVSbiLib.h
> new file mode 100644
> index 000000000000..3a3cbfb879f1
> --- /dev/null
> +++ b/MdePkg/Include/Library/BaseRiscVSbiLib.h
> @@ -0,0 +1,127 @@
> +/** @file
> + Library to call the RISC-V SBI ecalls
> +
> + Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> + @par Glossary:
> + - Hart - Hardware Thread, similar to a CPU core
> +
> + Currently, EDK2 needs to call SBI only to set the time and to do system reset.
> +
> +**/
> +
> +#ifndef RISCV_SBI_LIB_H_
> +#define RISCV_SBI_LIB_H_
> +
> +#include <Uefi.h>
> +
> +/* SBI Extension IDs */
> +#define SBI_EXT_TIME 0x54494D45
> +#define SBI_EXT_SRST 0x53525354
> +
> +/* SBI function IDs for TIME extension*/
> +#define SBI_EXT_TIME_SET_TIMER 0x0
> +
> +/* SBI function IDs for SRST extension */
> +#define SBI_EXT_SRST_RESET 0x0
> +
> +#define SBI_SRST_RESET_TYPE_SHUTDOWN 0x0
> +#define SBI_SRST_RESET_TYPE_COLD_REBOOT 0x1
> +#define SBI_SRST_RESET_TYPE_WARM_REBOOT 0x2
> +
> +#define SBI_SRST_RESET_REASON_NONE 0x0
> +#define SBI_SRST_RESET_REASON_SYSFAIL 0x1
> +
> +/* SBI return error codes */
> +#define SBI_SUCCESS 0
> +#define SBI_ERR_FAILED -1
> +#define SBI_ERR_NOT_SUPPORTED -2
> +#define SBI_ERR_INVALID_PARAM -3
> +#define SBI_ERR_DENIED -4
> +#define SBI_ERR_INVALID_ADDRESS -5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
> +
> +#define SBI_LAST_ERR SBI_ERR_ALREADY_STOPPED
> +
> +typedef struct {
> + UINT64 BootHartId;
> + VOID *PeiServiceTable; // PEI Service table
> + VOID *PrePiHobList; // Pre PI Hob List
> + UINT64 FlattenedDeviceTree; // Pointer to Flattened Device tree
> +} EFI_RISCV_FIRMWARE_CONTEXT;
> +
> +//
> +// EDK2 OpenSBI firmware extension return status.
> +//
> +typedef struct {
> + UINTN Error; ///< SBI status code
> + UINTN Value; ///< Value returned
> +} SBI_RET;
> +
> +VOID
> +EFIAPI
> +SbiSetTimer (
> + IN UINT64 Time
> + );
> +
> +EFI_STATUS
> +EFIAPI
> +SbiSystemReset (
> + IN UINTN ResetType,
> + IN UINTN ResetReason
> + );
> +
> +/**
> + Get firmware context of the calling hart.
> +
> + @param[out] FirmwareContext The firmware context pointer.
> +**/
> +VOID
> +EFIAPI
> +GetFirmwareContext (
> + OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
> + );
> +
> +/**
> + Set firmware context of the calling hart.
> +
> + @param[in] FirmwareContext The firmware context pointer.
> +**/
> +VOID
> +EFIAPI
> +SetFirmwareContext (
> + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
> + );
> +
> +/**
> + Get pointer to OpenSBI Firmware Context
> +
> + Get the pointer of firmware context.
> +
> + @param FirmwareContextPtr Pointer to retrieve pointer to the
> + Firmware Context.
> +**/
> +VOID
> +EFIAPI
> +GetFirmwareContextPointer (
> + IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
> + );
> +
> +/**
> + Set pointer to OpenSBI Firmware Context
> +
> + Set the pointer of firmware context.
> +
> + @param FirmwareContextPtr Pointer to Firmware Context.
> +**/
> +VOID
> +EFIAPI
> +SetFirmwareContextPointer (
> + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
> + );
> +
> +#endif
> diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
> new file mode 100644
> index 000000000000..15222a528753
> --- /dev/null
> +++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
> @@ -0,0 +1,227 @@
> +/** @file
> + Instance of the SBI ecall library.
> +
> + It allows calling an SBI function via an ecall from S-Mode.
> +
> + Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/BaseRiscVSbiLib.h>
> +
> +//
> +// Maximum arguments for SBI ecall
> +#define SBI_CALL_MAX_ARGS 6
> +
> +/**
> + Call SBI call using ecall instruction.
> +
> + Asserts when NumArgs exceeds SBI_CALL_MAX_ARGS.
> +
> + @param[in] ExtId SBI extension ID.
> + @param[in] FuncId SBI function ID.
> + @param[in] NumArgs Number of arguments to pass to the ecall.
> + @param[in] ... Argument list for the ecall.
> +
> + @retval Returns SBI_RET structure with value and error code.
> +
> +**/
> +STATIC
> +SBI_RET
> +EFIAPI
> +SbiCall (
> + IN UINTN ExtId,
> + IN UINTN FuncId,
> + IN UINTN NumArgs,
> + ...
> + )
> +{
> + UINTN I;
> + SBI_RET Ret;
> + UINTN Args[SBI_CALL_MAX_ARGS];
> + VA_LIST ArgList;
> +
> + VA_START (ArgList, NumArgs);
> +
> + if (NumArgs > SBI_CALL_MAX_ARGS) {
> + Ret.Error = SBI_ERR_INVALID_PARAM;
> + Ret.Value = -1;
> + return Ret;
> + }
> +
> + for (I = 0; I < SBI_CALL_MAX_ARGS; I++) {
> + if (I < NumArgs) {
> + Args[I] = VA_ARG (ArgList, UINTN);
> + } else {
> + // Default to 0 for all arguments that are not given
> + Args[I] = 0;
> + }
> + }
> +
> + VA_END (ArgList);
> +
> + register UINTN a0 asm ("a0") = Args[0];
> + register UINTN a1 asm ("a1") = Args[1];
> + register UINTN a2 asm ("a2") = Args[2];
> + register UINTN a3 asm ("a3") = Args[3];
> + register UINTN a4 asm ("a4") = Args[4];
> + register UINTN a5 asm ("a5") = Args[5];
> + register UINTN a6 asm ("a6") = (UINTN)(FuncId);
> + register UINTN a7 asm ("a7") = (UINTN)(ExtId);
> +
> + asm volatile ("ecall" \
> + : "+r" (a0), "+r" (a1) \
> + : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) \
> + : "memory"); \
> + Ret.Error = a0;
> + Ret.Value = a1;
Why is inline assembly used here? I see use of .S files in BaseLib
Can this be converted to .S file?
> + return Ret;
> +}
> +
> +/**
> + Translate SBI error code to EFI status.
> +
> + @param[in] SbiError SBI error code
> + @retval EFI_STATUS
> +**/
> +STATIC
> +EFI_STATUS
> +EFIAPI
> +TranslateError (
> + IN UINTN SbiError
> + )
> +{
> + switch (SbiError) {
> + case SBI_SUCCESS:
> + return EFI_SUCCESS;
> + case SBI_ERR_FAILED:
> + return EFI_DEVICE_ERROR;
> + break;
> + case SBI_ERR_NOT_SUPPORTED:
> + return EFI_UNSUPPORTED;
> + break;
> + case SBI_ERR_INVALID_PARAM:
> + return EFI_INVALID_PARAMETER;
> + break;
> + case SBI_ERR_DENIED:
> + return EFI_ACCESS_DENIED;
> + break;
> + case SBI_ERR_INVALID_ADDRESS:
> + return EFI_LOAD_ERROR;
> + break;
> + case SBI_ERR_ALREADY_AVAILABLE:
> + return EFI_ALREADY_STARTED;
> + break;
> + default:
> + //
> + // Reaches here only if SBI has defined a new error type
> + //
> + ASSERT (FALSE);
> + return EFI_UNSUPPORTED;
> + break;
> + }
> +}
> +
> +/**
> + Clear pending timer interrupt bit and set timer for next event after Time.
> +
> + To clear the timer without scheduling a timer event, set Time to a
> + practically infinite value or mask the timer interrupt by clearing sie.STIE.
> +
> + @param[in] Time The time offset to the next scheduled timer interrupt.
> +**/
> +VOID
> +EFIAPI
> +SbiSetTimer (
> + IN UINT64 Time
> + )
> +{
> + SbiCall (SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, 1, Time);
> +}
> +
> +EFI_STATUS
> +EFIAPI
> +SbiSystemReset (
> + IN UINTN ResetType,
> + IN UINTN ResetReason
> + )
> +{
> + SBI_RET Ret;
> +
> + Ret = SbiCall (
> + SBI_EXT_SRST,
> + SBI_EXT_SRST_RESET,
> + 2,
> + ResetType,
> + ResetReason
> + );
> +
> + return TranslateError (Ret.Error);
> +}
> +
> +/**
> + Get firmware context of the calling hart.
> +
> + @param[out] FirmwareContext The firmware context pointer.
> + @retval EFI_SUCCESS The operation succeeds.
> +**/
> +VOID
> +EFIAPI
> +GetFirmwareContext (
> + OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
> + )
> +{
> + *FirmwareContext = (EFI_RISCV_FIRMWARE_CONTEXT *)RiscVGetSupervisorScratch ();
> +}
> +
> +/**
> + Set firmware context of the calling hart.
> +
> + @param[in] FirmwareContext The firmware context pointer.
> +**/
> +VOID
> +EFIAPI
> +SetFirmwareContext (
> + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
> + )
> +{
> + RiscVSetSupervisorScratch ((UINT64)FirmwareContext);
> +}
> +
> +/**
> + Get pointer to OpenSBI Firmware Context
> +
> + Get the pointer of firmware context through OpenSBI FW Extension SBI.
> +
> + @param FirmwareContextPtr Pointer to retrieve pointer to the
> + Firmware Context.
> +**/
> +VOID
> +EFIAPI
> +GetFirmwareContextPointer (
> + IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
> + )
> +{
> + GetFirmwareContext (FirmwareContextPtr);
> +}
> +
> +/**
> + Set the pointer to OpenSBI Firmware Context
> +
> + Set the pointer of firmware context through OpenSBI FW Extension SBI.
> +
> + @param FirmwareContextPtr Pointer to Firmware Context.
> +**/
> +VOID
> +EFIAPI
> +SetFirmwareContextPointer (
> + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
> + )
> +{
> + SetFirmwareContext (FirmwareContextPtr);
> +}
> --
> 2.38.0
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Hi Mike,
On Thu, Feb 09, 2023 at 01:45:48AM +0000, Michael D Kinney wrote:
> One comment below.
>
> Mike
>
> > -----Original Message-----
> > From: Sunil V L <sunilvl@ventanamicro.com>
> > Sent: Saturday, January 28, 2023 11:18 AM
> > To: devel@edk2.groups.io
> > Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>;
> > Abner Chang <abner.chang@amd.com>
> > Subject: [edk2-staging/RiscV64QemuVirt PATCH V7 03/20] MdePkg: Add BaseRiscVSbiLib Library for RISC-V
> >
> > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
> >
> > This library is required to make SBI ecalls from the S-mode EDK2.
> > This is mostly copied from
> > edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVEdk2SbiLib
> >
> > Cc: Michael D Kinney <michael.d.kinney@intel.com>
> > Cc: Liming Gao <gaoliming@byosoft.com.cn>
> > Cc: Zhiguang Liu <zhiguang.liu@intel.com>
> > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> > Acked-by: Abner Chang <abner.chang@amd.com>
> > ---
> > MdePkg/MdePkg.dec | 4 +
> > MdePkg/MdePkg.dsc | 3 +
> > MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf | 25 +++
> > MdePkg/Include/Library/BaseRiscVSbiLib.h | 127 +++++++++++
> > MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 227 ++++++++++++++++++++
> > 5 files changed, 386 insertions(+)
> >
> > diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
> > index 3d08f20d15b0..ca2e4dcf815c 100644
> > --- a/MdePkg/MdePkg.dec
> > +++ b/MdePkg/MdePkg.dec
> > @@ -316,6 +316,10 @@ [LibraryClasses.IA32, LibraryClasses.X64]
> > ## @libraryclass Provides function to support TDX processing.
> > TdxLib|Include/Library/TdxLib.h
> >
> > +[LibraryClasses.RISCV64]
> > + ## @libraryclass Provides function to make ecalls to SBI
> > + BaseRiscVSbiLib|Include/Library/BaseRiscVSbiLib.h
> > +
> > [Guids]
> > #
> > # GUID defined in UEFI2.1/UEFI2.0/EFI1.1
> > diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
> > index 32a852dc466e..0ac7618b4623 100644
> > --- a/MdePkg/MdePkg.dsc
> > +++ b/MdePkg/MdePkg.dsc
> > @@ -190,4 +190,7 @@ [Components.ARM, Components.AARCH64]
> > MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsicArmVirt.inf
> > MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
> >
> > +[Components.RISCV64]
> > + MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> > +
> > [BuildOptions]
> > diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> > new file mode 100644
> > index 000000000000..d03132bf01c1
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> > @@ -0,0 +1,25 @@
> > +## @file
> > +# RISC-V Library to call SBI ecalls
> > +#
> > +# Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
> > +#
> > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> > +#
> > +##
> > +
> > +[Defines]
> > + INF_VERSION = 0x0001001b
> > + BASE_NAME = BaseRiscVSbiLib
> > + FILE_GUID = D742CF3D-E600-4009-8FB5-318073008508
> > + MODULE_TYPE = BASE
> > + VERSION_STRING = 1.0
> > + LIBRARY_CLASS = RiscVSbiLib
> > +
> > +[Sources]
> > + BaseRiscVSbiLib.c
> > +
> > +[Packages]
> > + MdePkg/MdePkg.dec
> > +
> > +[LibraryClasses]
> > + BaseLib
> > diff --git a/MdePkg/Include/Library/BaseRiscVSbiLib.h b/MdePkg/Include/Library/BaseRiscVSbiLib.h
> > new file mode 100644
> > index 000000000000..3a3cbfb879f1
> > --- /dev/null
> > +++ b/MdePkg/Include/Library/BaseRiscVSbiLib.h
> > @@ -0,0 +1,127 @@
> > +/** @file
> > + Library to call the RISC-V SBI ecalls
> > +
> > + Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
> > +
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > + @par Glossary:
> > + - Hart - Hardware Thread, similar to a CPU core
> > +
> > + Currently, EDK2 needs to call SBI only to set the time and to do system reset.
> > +
> > +**/
> > +
> > +#ifndef RISCV_SBI_LIB_H_
> > +#define RISCV_SBI_LIB_H_
> > +
> > +#include <Uefi.h>
> > +
> > +/* SBI Extension IDs */
> > +#define SBI_EXT_TIME 0x54494D45
> > +#define SBI_EXT_SRST 0x53525354
> > +
> > +/* SBI function IDs for TIME extension*/
> > +#define SBI_EXT_TIME_SET_TIMER 0x0
> > +
> > +/* SBI function IDs for SRST extension */
> > +#define SBI_EXT_SRST_RESET 0x0
> > +
> > +#define SBI_SRST_RESET_TYPE_SHUTDOWN 0x0
> > +#define SBI_SRST_RESET_TYPE_COLD_REBOOT 0x1
> > +#define SBI_SRST_RESET_TYPE_WARM_REBOOT 0x2
> > +
> > +#define SBI_SRST_RESET_REASON_NONE 0x0
> > +#define SBI_SRST_RESET_REASON_SYSFAIL 0x1
> > +
> > +/* SBI return error codes */
> > +#define SBI_SUCCESS 0
> > +#define SBI_ERR_FAILED -1
> > +#define SBI_ERR_NOT_SUPPORTED -2
> > +#define SBI_ERR_INVALID_PARAM -3
> > +#define SBI_ERR_DENIED -4
> > +#define SBI_ERR_INVALID_ADDRESS -5
> > +#define SBI_ERR_ALREADY_AVAILABLE -6
> > +#define SBI_ERR_ALREADY_STARTED -7
> > +#define SBI_ERR_ALREADY_STOPPED -8
> > +
> > +#define SBI_LAST_ERR SBI_ERR_ALREADY_STOPPED
> > +
> > +typedef struct {
> > + UINT64 BootHartId;
> > + VOID *PeiServiceTable; // PEI Service table
> > + VOID *PrePiHobList; // Pre PI Hob List
> > + UINT64 FlattenedDeviceTree; // Pointer to Flattened Device tree
> > +} EFI_RISCV_FIRMWARE_CONTEXT;
> > +
> > +//
> > +// EDK2 OpenSBI firmware extension return status.
> > +//
> > +typedef struct {
> > + UINTN Error; ///< SBI status code
> > + UINTN Value; ///< Value returned
> > +} SBI_RET;
> > +
> > +VOID
> > +EFIAPI
> > +SbiSetTimer (
> > + IN UINT64 Time
> > + );
> > +
> > +EFI_STATUS
> > +EFIAPI
> > +SbiSystemReset (
> > + IN UINTN ResetType,
> > + IN UINTN ResetReason
> > + );
> > +
> > +/**
> > + Get firmware context of the calling hart.
> > +
> > + @param[out] FirmwareContext The firmware context pointer.
> > +**/
> > +VOID
> > +EFIAPI
> > +GetFirmwareContext (
> > + OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
> > + );
> > +
> > +/**
> > + Set firmware context of the calling hart.
> > +
> > + @param[in] FirmwareContext The firmware context pointer.
> > +**/
> > +VOID
> > +EFIAPI
> > +SetFirmwareContext (
> > + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
> > + );
> > +
> > +/**
> > + Get pointer to OpenSBI Firmware Context
> > +
> > + Get the pointer of firmware context.
> > +
> > + @param FirmwareContextPtr Pointer to retrieve pointer to the
> > + Firmware Context.
> > +**/
> > +VOID
> > +EFIAPI
> > +GetFirmwareContextPointer (
> > + IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
> > + );
> > +
> > +/**
> > + Set pointer to OpenSBI Firmware Context
> > +
> > + Set the pointer of firmware context.
> > +
> > + @param FirmwareContextPtr Pointer to Firmware Context.
> > +**/
> > +VOID
> > +EFIAPI
> > +SetFirmwareContextPointer (
> > + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
> > + );
> > +
> > +#endif
> > diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
> > new file mode 100644
> > index 000000000000..15222a528753
> > --- /dev/null
> > +++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
> > @@ -0,0 +1,227 @@
> > +/** @file
> > + Instance of the SBI ecall library.
> > +
> > + It allows calling an SBI function via an ecall from S-Mode.
> > +
> > + Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
> > +
> > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > +
> > +**/
> > +
> > +#include <Library/BaseLib.h>
> > +#include <Library/BaseMemoryLib.h>
> > +#include <Library/DebugLib.h>
> > +#include <Library/BaseRiscVSbiLib.h>
> > +
> > +//
> > +// Maximum arguments for SBI ecall
> > +#define SBI_CALL_MAX_ARGS 6
> > +
> > +/**
> > + Call SBI call using ecall instruction.
> > +
> > + Asserts when NumArgs exceeds SBI_CALL_MAX_ARGS.
> > +
> > + @param[in] ExtId SBI extension ID.
> > + @param[in] FuncId SBI function ID.
> > + @param[in] NumArgs Number of arguments to pass to the ecall.
> > + @param[in] ... Argument list for the ecall.
> > +
> > + @retval Returns SBI_RET structure with value and error code.
> > +
> > +**/
> > +STATIC
> > +SBI_RET
> > +EFIAPI
> > +SbiCall (
> > + IN UINTN ExtId,
> > + IN UINTN FuncId,
> > + IN UINTN NumArgs,
> > + ...
> > + )
> > +{
> > + UINTN I;
> > + SBI_RET Ret;
> > + UINTN Args[SBI_CALL_MAX_ARGS];
> > + VA_LIST ArgList;
> > +
> > + VA_START (ArgList, NumArgs);
> > +
> > + if (NumArgs > SBI_CALL_MAX_ARGS) {
> > + Ret.Error = SBI_ERR_INVALID_PARAM;
> > + Ret.Value = -1;
> > + return Ret;
> > + }
> > +
> > + for (I = 0; I < SBI_CALL_MAX_ARGS; I++) {
> > + if (I < NumArgs) {
> > + Args[I] = VA_ARG (ArgList, UINTN);
> > + } else {
> > + // Default to 0 for all arguments that are not given
> > + Args[I] = 0;
> > + }
> > + }
> > +
> > + VA_END (ArgList);
> > +
> > + register UINTN a0 asm ("a0") = Args[0];
> > + register UINTN a1 asm ("a1") = Args[1];
> > + register UINTN a2 asm ("a2") = Args[2];
> > + register UINTN a3 asm ("a3") = Args[3];
> > + register UINTN a4 asm ("a4") = Args[4];
> > + register UINTN a5 asm ("a5") = Args[5];
> > + register UINTN a6 asm ("a6") = (UINTN)(FuncId);
> > + register UINTN a7 asm ("a7") = (UINTN)(ExtId);
> > +
> > + asm volatile ("ecall" \
> > + : "+r" (a0), "+r" (a1) \
> > + : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) \
> > + : "memory"); \
> > + Ret.Error = a0;
> > + Ret.Value = a1;
>
> Why is inline assembly used here? I see use of .S files in BaseLib
> Can this be converted to .S file?
>
It was ported as is from edk2-platforms. I can convert into .S file and
I prefer to add it in this library itself than BaseLib.
Thanks!,
Sunil
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I agree with keeping the .S file in this component.
I was only referring to BaseLib as other examples that used
.S instead of inline assembly.
Mike
> -----Original Message-----
> From: Sunil V L <sunilvl@ventanamicro.com>
> Sent: Wednesday, February 8, 2023 11:19 PM
> To: devel@edk2.groups.io; Kinney, Michael D <michael.d.kinney@intel.com>
> Cc: Gao, Liming <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>; Abner Chang <abner.chang@amd.com>
> Subject: Re: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 03/20] MdePkg: Add BaseRiscVSbiLib Library for RISC-V
>
> Hi Mike,
>
> On Thu, Feb 09, 2023 at 01:45:48AM +0000, Michael D Kinney wrote:
> > One comment below.
> >
> > Mike
> >
> > > -----Original Message-----
> > > From: Sunil V L <sunilvl@ventanamicro.com>
> > > Sent: Saturday, January 28, 2023 11:18 AM
> > > To: devel@edk2.groups.io
> > > Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Liu, Zhiguang
> <zhiguang.liu@intel.com>;
> > > Abner Chang <abner.chang@amd.com>
> > > Subject: [edk2-staging/RiscV64QemuVirt PATCH V7 03/20] MdePkg: Add BaseRiscVSbiLib Library for RISC-V
> > >
> > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
> > >
> > > This library is required to make SBI ecalls from the S-mode EDK2.
> > > This is mostly copied from
> > > edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVEdk2SbiLib
> > >
> > > Cc: Michael D Kinney <michael.d.kinney@intel.com>
> > > Cc: Liming Gao <gaoliming@byosoft.com.cn>
> > > Cc: Zhiguang Liu <zhiguang.liu@intel.com>
> > > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> > > Acked-by: Abner Chang <abner.chang@amd.com>
> > > ---
> > > MdePkg/MdePkg.dec | 4 +
> > > MdePkg/MdePkg.dsc | 3 +
> > > MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf | 25 +++
> > > MdePkg/Include/Library/BaseRiscVSbiLib.h | 127 +++++++++++
> > > MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 227 ++++++++++++++++++++
> > > 5 files changed, 386 insertions(+)
> > >
> > > diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
> > > index 3d08f20d15b0..ca2e4dcf815c 100644
> > > --- a/MdePkg/MdePkg.dec
> > > +++ b/MdePkg/MdePkg.dec
> > > @@ -316,6 +316,10 @@ [LibraryClasses.IA32, LibraryClasses.X64]
> > > ## @libraryclass Provides function to support TDX processing.
> > > TdxLib|Include/Library/TdxLib.h
> > >
> > > +[LibraryClasses.RISCV64]
> > > + ## @libraryclass Provides function to make ecalls to SBI
> > > + BaseRiscVSbiLib|Include/Library/BaseRiscVSbiLib.h
> > > +
> > > [Guids]
> > > #
> > > # GUID defined in UEFI2.1/UEFI2.0/EFI1.1
> > > diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
> > > index 32a852dc466e..0ac7618b4623 100644
> > > --- a/MdePkg/MdePkg.dsc
> > > +++ b/MdePkg/MdePkg.dsc
> > > @@ -190,4 +190,7 @@ [Components.ARM, Components.AARCH64]
> > > MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsicArmVirt.inf
> > > MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
> > >
> > > +[Components.RISCV64]
> > > + MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> > > +
> > > [BuildOptions]
> > > diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> > > new file mode 100644
> > > index 000000000000..d03132bf01c1
> > > --- /dev/null
> > > +++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
> > > @@ -0,0 +1,25 @@
> > > +## @file
> > > +# RISC-V Library to call SBI ecalls
> > > +#
> > > +# Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
> > > +#
> > > +# SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +#
> > > +##
> > > +
> > > +[Defines]
> > > + INF_VERSION = 0x0001001b
> > > + BASE_NAME = BaseRiscVSbiLib
> > > + FILE_GUID = D742CF3D-E600-4009-8FB5-318073008508
> > > + MODULE_TYPE = BASE
> > > + VERSION_STRING = 1.0
> > > + LIBRARY_CLASS = RiscVSbiLib
> > > +
> > > +[Sources]
> > > + BaseRiscVSbiLib.c
> > > +
> > > +[Packages]
> > > + MdePkg/MdePkg.dec
> > > +
> > > +[LibraryClasses]
> > > + BaseLib
> > > diff --git a/MdePkg/Include/Library/BaseRiscVSbiLib.h b/MdePkg/Include/Library/BaseRiscVSbiLib.h
> > > new file mode 100644
> > > index 000000000000..3a3cbfb879f1
> > > --- /dev/null
> > > +++ b/MdePkg/Include/Library/BaseRiscVSbiLib.h
> > > @@ -0,0 +1,127 @@
> > > +/** @file
> > > + Library to call the RISC-V SBI ecalls
> > > +
> > > + Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
> > > +
> > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +
> > > + @par Glossary:
> > > + - Hart - Hardware Thread, similar to a CPU core
> > > +
> > > + Currently, EDK2 needs to call SBI only to set the time and to do system reset.
> > > +
> > > +**/
> > > +
> > > +#ifndef RISCV_SBI_LIB_H_
> > > +#define RISCV_SBI_LIB_H_
> > > +
> > > +#include <Uefi.h>
> > > +
> > > +/* SBI Extension IDs */
> > > +#define SBI_EXT_TIME 0x54494D45
> > > +#define SBI_EXT_SRST 0x53525354
> > > +
> > > +/* SBI function IDs for TIME extension*/
> > > +#define SBI_EXT_TIME_SET_TIMER 0x0
> > > +
> > > +/* SBI function IDs for SRST extension */
> > > +#define SBI_EXT_SRST_RESET 0x0
> > > +
> > > +#define SBI_SRST_RESET_TYPE_SHUTDOWN 0x0
> > > +#define SBI_SRST_RESET_TYPE_COLD_REBOOT 0x1
> > > +#define SBI_SRST_RESET_TYPE_WARM_REBOOT 0x2
> > > +
> > > +#define SBI_SRST_RESET_REASON_NONE 0x0
> > > +#define SBI_SRST_RESET_REASON_SYSFAIL 0x1
> > > +
> > > +/* SBI return error codes */
> > > +#define SBI_SUCCESS 0
> > > +#define SBI_ERR_FAILED -1
> > > +#define SBI_ERR_NOT_SUPPORTED -2
> > > +#define SBI_ERR_INVALID_PARAM -3
> > > +#define SBI_ERR_DENIED -4
> > > +#define SBI_ERR_INVALID_ADDRESS -5
> > > +#define SBI_ERR_ALREADY_AVAILABLE -6
> > > +#define SBI_ERR_ALREADY_STARTED -7
> > > +#define SBI_ERR_ALREADY_STOPPED -8
> > > +
> > > +#define SBI_LAST_ERR SBI_ERR_ALREADY_STOPPED
> > > +
> > > +typedef struct {
> > > + UINT64 BootHartId;
> > > + VOID *PeiServiceTable; // PEI Service table
> > > + VOID *PrePiHobList; // Pre PI Hob List
> > > + UINT64 FlattenedDeviceTree; // Pointer to Flattened Device tree
> > > +} EFI_RISCV_FIRMWARE_CONTEXT;
> > > +
> > > +//
> > > +// EDK2 OpenSBI firmware extension return status.
> > > +//
> > > +typedef struct {
> > > + UINTN Error; ///< SBI status code
> > > + UINTN Value; ///< Value returned
> > > +} SBI_RET;
> > > +
> > > +VOID
> > > +EFIAPI
> > > +SbiSetTimer (
> > > + IN UINT64 Time
> > > + );
> > > +
> > > +EFI_STATUS
> > > +EFIAPI
> > > +SbiSystemReset (
> > > + IN UINTN ResetType,
> > > + IN UINTN ResetReason
> > > + );
> > > +
> > > +/**
> > > + Get firmware context of the calling hart.
> > > +
> > > + @param[out] FirmwareContext The firmware context pointer.
> > > +**/
> > > +VOID
> > > +EFIAPI
> > > +GetFirmwareContext (
> > > + OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
> > > + );
> > > +
> > > +/**
> > > + Set firmware context of the calling hart.
> > > +
> > > + @param[in] FirmwareContext The firmware context pointer.
> > > +**/
> > > +VOID
> > > +EFIAPI
> > > +SetFirmwareContext (
> > > + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
> > > + );
> > > +
> > > +/**
> > > + Get pointer to OpenSBI Firmware Context
> > > +
> > > + Get the pointer of firmware context.
> > > +
> > > + @param FirmwareContextPtr Pointer to retrieve pointer to the
> > > + Firmware Context.
> > > +**/
> > > +VOID
> > > +EFIAPI
> > > +GetFirmwareContextPointer (
> > > + IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
> > > + );
> > > +
> > > +/**
> > > + Set pointer to OpenSBI Firmware Context
> > > +
> > > + Set the pointer of firmware context.
> > > +
> > > + @param FirmwareContextPtr Pointer to Firmware Context.
> > > +**/
> > > +VOID
> > > +EFIAPI
> > > +SetFirmwareContextPointer (
> > > + IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
> > > + );
> > > +
> > > +#endif
> > > diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
> > > new file mode 100644
> > > index 000000000000..15222a528753
> > > --- /dev/null
> > > +++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
> > > @@ -0,0 +1,227 @@
> > > +/** @file
> > > + Instance of the SBI ecall library.
> > > +
> > > + It allows calling an SBI function via an ecall from S-Mode.
> > > +
> > > + Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
> > > +
> > > + SPDX-License-Identifier: BSD-2-Clause-Patent
> > > +
> > > +**/
> > > +
> > > +#include <Library/BaseLib.h>
> > > +#include <Library/BaseMemoryLib.h>
> > > +#include <Library/DebugLib.h>
> > > +#include <Library/BaseRiscVSbiLib.h>
> > > +
> > > +//
> > > +// Maximum arguments for SBI ecall
> > > +#define SBI_CALL_MAX_ARGS 6
> > > +
> > > +/**
> > > + Call SBI call using ecall instruction.
> > > +
> > > + Asserts when NumArgs exceeds SBI_CALL_MAX_ARGS.
> > > +
> > > + @param[in] ExtId SBI extension ID.
> > > + @param[in] FuncId SBI function ID.
> > > + @param[in] NumArgs Number of arguments to pass to the ecall.
> > > + @param[in] ... Argument list for the ecall.
> > > +
> > > + @retval Returns SBI_RET structure with value and error code.
> > > +
> > > +**/
> > > +STATIC
> > > +SBI_RET
> > > +EFIAPI
> > > +SbiCall (
> > > + IN UINTN ExtId,
> > > + IN UINTN FuncId,
> > > + IN UINTN NumArgs,
> > > + ...
> > > + )
> > > +{
> > > + UINTN I;
> > > + SBI_RET Ret;
> > > + UINTN Args[SBI_CALL_MAX_ARGS];
> > > + VA_LIST ArgList;
> > > +
> > > + VA_START (ArgList, NumArgs);
> > > +
> > > + if (NumArgs > SBI_CALL_MAX_ARGS) {
> > > + Ret.Error = SBI_ERR_INVALID_PARAM;
> > > + Ret.Value = -1;
> > > + return Ret;
> > > + }
> > > +
> > > + for (I = 0; I < SBI_CALL_MAX_ARGS; I++) {
> > > + if (I < NumArgs) {
> > > + Args[I] = VA_ARG (ArgList, UINTN);
> > > + } else {
> > > + // Default to 0 for all arguments that are not given
> > > + Args[I] = 0;
> > > + }
> > > + }
> > > +
> > > + VA_END (ArgList);
> > > +
> > > + register UINTN a0 asm ("a0") = Args[0];
> > > + register UINTN a1 asm ("a1") = Args[1];
> > > + register UINTN a2 asm ("a2") = Args[2];
> > > + register UINTN a3 asm ("a3") = Args[3];
> > > + register UINTN a4 asm ("a4") = Args[4];
> > > + register UINTN a5 asm ("a5") = Args[5];
> > > + register UINTN a6 asm ("a6") = (UINTN)(FuncId);
> > > + register UINTN a7 asm ("a7") = (UINTN)(ExtId);
> > > +
> > > + asm volatile ("ecall" \
> > > + : "+r" (a0), "+r" (a1) \
> > > + : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) \
> > > + : "memory"); \
> > > + Ret.Error = a0;
> > > + Ret.Value = a1;
> >
> > Why is inline assembly used here? I see use of .S files in BaseLib
> > Can this be converted to .S file?
> >
> It was ported as is from edk2-platforms. I can convert into .S file and
> I prefer to add it in this library itself than BaseLib.
>
> Thanks!,
> Sunil
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Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sunil V L
Sent: Saturday, January 28, 2023 1:18 PM
To: devel@edk2.groups.io
Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>; Abner Chang <abner.chang@amd.com>
Subject: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 03/20] MdePkg: Add BaseRiscVSbiLib Library for RISC-V
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4076
This library is required to make SBI ecalls from the S-mode EDK2.
This is mostly copied from
edk2-platforms/Silicon/RISC-V/ProcessorPkg/Library/RiscVEdk2SbiLib
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
---
MdePkg/MdePkg.dec | 4 +
MdePkg/MdePkg.dsc | 3 +
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf | 25 +++
MdePkg/Include/Library/BaseRiscVSbiLib.h | 127 +++++++++++
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c | 227 ++++++++++++++++++++
5 files changed, 386 insertions(+)
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec index 3d08f20d15b0..ca2e4dcf815c 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -316,6 +316,10 @@ [LibraryClasses.IA32, LibraryClasses.X64]
## @libraryclass Provides function to support TDX processing.
TdxLib|Include/Library/TdxLib.h
+[LibraryClasses.RISCV64]
+ ## @libraryclass Provides function to make ecalls to SBI
+ BaseRiscVSbiLib|Include/Library/BaseRiscVSbiLib.h
+
[Guids]
#
# GUID defined in UEFI2.1/UEFI2.0/EFI1.1 diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc index 32a852dc466e..0ac7618b4623 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -190,4 +190,7 @@ [Components.ARM, Components.AARCH64]
MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsicArmVirt.inf
MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
+[Components.RISCV64]
+ MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
+
[BuildOptions]
diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
new file mode 100644
index 000000000000..d03132bf01c1
--- /dev/null
+++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
@@ -0,0 +1,25 @@
+## @file
+# RISC-V Library to call SBI ecalls
+#
+# Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All
+rights reserved.<BR> # # SPDX-License-Identifier: BSD-2-Clause-Patent
+# ##
+
+[Defines]
+ INF_VERSION = 0x0001001b
+ BASE_NAME = BaseRiscVSbiLib
+ FILE_GUID = D742CF3D-E600-4009-8FB5-318073008508
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = RiscVSbiLib
+
+[Sources]
+ BaseRiscVSbiLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ BaseLib
diff --git a/MdePkg/Include/Library/BaseRiscVSbiLib.h b/MdePkg/Include/Library/BaseRiscVSbiLib.h
new file mode 100644
index 000000000000..3a3cbfb879f1
--- /dev/null
+++ b/MdePkg/Include/Library/BaseRiscVSbiLib.h
@@ -0,0 +1,127 @@
+/** @file
+ Library to call the RISC-V SBI ecalls
+
+ Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights
+ reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ @par Glossary:
+ - Hart - Hardware Thread, similar to a CPU core
+
+ Currently, EDK2 needs to call SBI only to set the time and to do system reset.
+
+**/
+
+#ifndef RISCV_SBI_LIB_H_
+#define RISCV_SBI_LIB_H_
+
+#include <Uefi.h>
+
+/* SBI Extension IDs */
+#define SBI_EXT_TIME 0x54494D45
+#define SBI_EXT_SRST 0x53525354
+
+/* SBI function IDs for TIME extension*/ #define SBI_EXT_TIME_SET_TIMER
+0x0
+
+/* SBI function IDs for SRST extension */ #define SBI_EXT_SRST_RESET
+0x0
+
+#define SBI_SRST_RESET_TYPE_SHUTDOWN 0x0
+#define SBI_SRST_RESET_TYPE_COLD_REBOOT 0x1 #define
+SBI_SRST_RESET_TYPE_WARM_REBOOT 0x2
+
+#define SBI_SRST_RESET_REASON_NONE 0x0
+#define SBI_SRST_RESET_REASON_SYSFAIL 0x1
+
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILED -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+
+#define SBI_LAST_ERR SBI_ERR_ALREADY_STOPPED
+
+typedef struct {
+ UINT64 BootHartId;
+ VOID *PeiServiceTable; // PEI Service table
+ VOID *PrePiHobList; // Pre PI Hob List
+ UINT64 FlattenedDeviceTree; // Pointer to Flattened Device tree
+} EFI_RISCV_FIRMWARE_CONTEXT;
+
+//
+// EDK2 OpenSBI firmware extension return status.
+//
+typedef struct {
+ UINTN Error; ///< SBI status code
+ UINTN Value; ///< Value returned
+} SBI_RET;
+
+VOID
+EFIAPI
+SbiSetTimer (
+ IN UINT64 Time
+ );
+
+EFI_STATUS
+EFIAPI
+SbiSystemReset (
+ IN UINTN ResetType,
+ IN UINTN ResetReason
+ );
+
+/**
+ Get firmware context of the calling hart.
+
+ @param[out] FirmwareContext The firmware context pointer.
+**/
+VOID
+EFIAPI
+GetFirmwareContext (
+ OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
+ );
+
+/**
+ Set firmware context of the calling hart.
+
+ @param[in] FirmwareContext The firmware context pointer.
+**/
+VOID
+EFIAPI
+SetFirmwareContext (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
+ );
+
+/**
+ Get pointer to OpenSBI Firmware Context
+
+ Get the pointer of firmware context.
+
+ @param FirmwareContextPtr Pointer to retrieve pointer to the
+ Firmware Context.
+**/
+VOID
+EFIAPI
+GetFirmwareContextPointer (
+ IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
+ );
+
+/**
+ Set pointer to OpenSBI Firmware Context
+
+ Set the pointer of firmware context.
+
+ @param FirmwareContextPtr Pointer to Firmware Context.
+**/
+VOID
+EFIAPI
+SetFirmwareContextPointer (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
+ );
+
+#endif
diff --git a/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
new file mode 100644
index 000000000000..15222a528753
--- /dev/null
+++ b/MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.c
@@ -0,0 +1,227 @@
+/** @file
+ Instance of the SBI ecall library.
+
+ It allows calling an SBI function via an ecall from S-Mode.
+
+ Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights
+ reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+//
+// Maximum arguments for SBI ecall
+#define SBI_CALL_MAX_ARGS 6
+
+/**
+ Call SBI call using ecall instruction.
+
+ Asserts when NumArgs exceeds SBI_CALL_MAX_ARGS.
+
+ @param[in] ExtId SBI extension ID.
+ @param[in] FuncId SBI function ID.
+ @param[in] NumArgs Number of arguments to pass to the ecall.
+ @param[in] ... Argument list for the ecall.
+
+ @retval Returns SBI_RET structure with value and error code.
+
+**/
+STATIC
+SBI_RET
+EFIAPI
+SbiCall (
+ IN UINTN ExtId,
+ IN UINTN FuncId,
+ IN UINTN NumArgs,
+ ...
+ )
+{
+ UINTN I;
+ SBI_RET Ret;
+ UINTN Args[SBI_CALL_MAX_ARGS];
+ VA_LIST ArgList;
+
+ VA_START (ArgList, NumArgs);
+
+ if (NumArgs > SBI_CALL_MAX_ARGS) {
+ Ret.Error = SBI_ERR_INVALID_PARAM;
+ Ret.Value = -1;
+ return Ret;
+ }
+
+ for (I = 0; I < SBI_CALL_MAX_ARGS; I++) {
+ if (I < NumArgs) {
+ Args[I] = VA_ARG (ArgList, UINTN);
+ } else {
+ // Default to 0 for all arguments that are not given
+ Args[I] = 0;
+ }
+ }
+
+ VA_END (ArgList);
+
+ register UINTN a0 asm ("a0") = Args[0]; register UINTN a1 asm
+ ("a1") = Args[1]; register UINTN a2 asm ("a2") = Args[2]; register
+ UINTN a3 asm ("a3") = Args[3]; register UINTN a4 asm ("a4") =
+ Args[4]; register UINTN a5 asm ("a5") = Args[5]; register UINTN a6
+ asm ("a6") = (UINTN)(FuncId); register UINTN a7 asm ("a7") =
+ (UINTN)(ExtId);
+
+ asm volatile ("ecall" \
+ : "+r" (a0), "+r" (a1) \
+ : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) \
+ : "memory"); \
+ Ret.Error = a0;
+ Ret.Value = a1;
+ return Ret;
+}
+
+/**
+ Translate SBI error code to EFI status.
+
+ @param[in] SbiError SBI error code
+ @retval EFI_STATUS
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+TranslateError (
+ IN UINTN SbiError
+ )
+{
+ switch (SbiError) {
+ case SBI_SUCCESS:
+ return EFI_SUCCESS;
+ case SBI_ERR_FAILED:
+ return EFI_DEVICE_ERROR;
+ break;
+ case SBI_ERR_NOT_SUPPORTED:
+ return EFI_UNSUPPORTED;
+ break;
+ case SBI_ERR_INVALID_PARAM:
+ return EFI_INVALID_PARAMETER;
+ break;
+ case SBI_ERR_DENIED:
+ return EFI_ACCESS_DENIED;
+ break;
+ case SBI_ERR_INVALID_ADDRESS:
+ return EFI_LOAD_ERROR;
+ break;
+ case SBI_ERR_ALREADY_AVAILABLE:
+ return EFI_ALREADY_STARTED;
+ break;
+ default:
+ //
+ // Reaches here only if SBI has defined a new error type
+ //
+ ASSERT (FALSE);
+ return EFI_UNSUPPORTED;
+ break;
+ }
+}
+
+/**
+ Clear pending timer interrupt bit and set timer for next event after Time.
+
+ To clear the timer without scheduling a timer event, set Time to a
+ practically infinite value or mask the timer interrupt by clearing sie.STIE.
+
+ @param[in] Time The time offset to the next scheduled timer interrupt.
+**/
+VOID
+EFIAPI
+SbiSetTimer (
+ IN UINT64 Time
+ )
+{
+ SbiCall (SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, 1, Time); }
+
+EFI_STATUS
+EFIAPI
+SbiSystemReset (
+ IN UINTN ResetType,
+ IN UINTN ResetReason
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (
+ SBI_EXT_SRST,
+ SBI_EXT_SRST_RESET,
+ 2,
+ ResetType,
+ ResetReason
+ );
+
+ return TranslateError (Ret.Error);
+}
+
+/**
+ Get firmware context of the calling hart.
+
+ @param[out] FirmwareContext The firmware context pointer.
+ @retval EFI_SUCCESS The operation succeeds.
+**/
+VOID
+EFIAPI
+GetFirmwareContext (
+ OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContext
+ )
+{
+ *FirmwareContext = (EFI_RISCV_FIRMWARE_CONTEXT
+*)RiscVGetSupervisorScratch (); }
+
+/**
+ Set firmware context of the calling hart.
+
+ @param[in] FirmwareContext The firmware context pointer.
+**/
+VOID
+EFIAPI
+SetFirmwareContext (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext
+ )
+{
+ RiscVSetSupervisorScratch ((UINT64)FirmwareContext); }
+
+/**
+ Get pointer to OpenSBI Firmware Context
+
+ Get the pointer of firmware context through OpenSBI FW Extension SBI.
+
+ @param FirmwareContextPtr Pointer to retrieve pointer to the
+ Firmware Context.
+**/
+VOID
+EFIAPI
+GetFirmwareContextPointer (
+ IN OUT EFI_RISCV_FIRMWARE_CONTEXT **FirmwareContextPtr
+ )
+{
+ GetFirmwareContext (FirmwareContextPtr); }
+
+/**
+ Set the pointer to OpenSBI Firmware Context
+
+ Set the pointer of firmware context through OpenSBI FW Extension SBI.
+
+ @param FirmwareContextPtr Pointer to Firmware Context.
+**/
+VOID
+EFIAPI
+SetFirmwareContextPointer (
+ IN EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContextPtr
+ )
+{
+ SetFirmwareContext (FirmwareContextPtr); }
--
2.38.0
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