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From: "Andrei Warkentin" <andrei.warkentin@intel.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>, "sunilvl@ventanamicro.com"
<sunilvl@ventanamicro.com>
CC: Ard Biesheuvel <ardb+tianocore@kernel.org>, "Yao, Jiewen"
<jiewen.yao@intel.com>, "Justen, Jordan L" <jordan.l.justen@intel.com>, "Gerd
Hoffmann" <kraxel@redhat.com>, Abner Chang <abner.chang@amd.com>
Subject: Re: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 15/20] OvmfPkg/RiscVVirt: Add ResetSystemLib library
Thread-Topic: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 15/20]
OvmfPkg/RiscVVirt: Add ResetSystemLib library
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Date: Mon, 6 Feb 2023 16:01:59 +0000
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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: Ard Biesheuvel <ardb+tianocore@kernel.org>; Yao, Jiewen <jiewen.yao@int=
el.com>; Justen, Jordan L <jordan.l.justen@intel.com>; Gerd Hoffmann <kraxe=
l@redhat.com>; Abner Chang <abner.chang@amd.com>
Subject: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 15/20] OvmfPkg=
/RiscVVirt: Add ResetSystemLib library
RISC-V Qemu virt uses SBI calls to implement the reset.
Add the base class library.
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
---
OvmfPkg/RiscVVirt/Library/ResetSystemLib/BaseResetSystemLib.inf | 38 ++++=
++
OvmfPkg/RiscVVirt/Library/ResetSystemLib/ResetSystemLib.c | 128 ++++=
++++++++++++++++
2 files changed, 166 insertions(+)
diff --git a/OvmfPkg/RiscVVirt/Library/ResetSystemLib/BaseResetSystemLib.in=
f b/OvmfPkg/RiscVVirt/Library/ResetSystemLib/BaseResetSystemLib.inf
new file mode 100644
index 000000000000..c3fa6bd99b52
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Library/ResetSystemLib/BaseResetSystemLib.inf
@@ -0,0 +1,38 @@
+## @file
+# Base library instance for ResetSystem library class for RISC-V # # =20
+Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>=20
+# # SPDX-License-Identifier: BSD-2-Clause-Patent # ##
+
+[Defines]
+ INF_VERSION =3D 0x0001001B
+ BASE_NAME =3D BaseResetSystemLib
+ FILE_GUID =3D AB45A200-769D-4C10-B0D6-5E1FF5EEBF31
+ MODULE_TYPE =3D BASE
+ VERSION_STRING =3D 1.0
+ LIBRARY_CLASS =3D ResetSystemLib
+
+#
+# The following information is for reference only and not required by=20
+the build # tools.
+#
+# VALID_ARCHITECTURES =3D RISCV64
+#
+
+[Sources]
+ ResetSystemLib.c
+
+[Packages]
+ MdeModulePkg/MdeModulePkg.dec
+ MdePkg/MdePkg.dec
+ OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+ BaseLib
+ DebugLib
+ IoLib
+ TimerLib
+ RiscVSbiLib
diff --git a/OvmfPkg/RiscVVirt/Library/ResetSystemLib/ResetSystemLib.c b/Ov=
mfPkg/RiscVVirt/Library/ResetSystemLib/ResetSystemLib.c
new file mode 100644
index 000000000000..14f7653aa8de
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Library/ResetSystemLib/ResetSystemLib.c
@@ -0,0 +1,128 @@
+/** @file
+ Reset System Library functions for RISC-V
+
+ Copyright (c) 2021, Hewlett Packard Development LP. All rights=20
+ reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/ResetSystemLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+/**
+ This function causes a system-wide reset (cold reset), in which
+ all circuitry within the system returns to its initial state. This=20
+type of reset
+ is asynchronous to system operation and operates without regard to
+ cycle boundaries.
+
+ If this function returns, it means that the system does not support cold=
reset.
+**/
+VOID
+EFIAPI
+ResetCold (
+ VOID
+ )
+{
+ // Warm Reset via SBI ecall
+ SbiSystemReset (SBI_SRST_RESET_TYPE_COLD_REBOOT,=20
+SBI_SRST_RESET_REASON_NONE); }
+
+/**
+ This function causes a system-wide initialization (warm reset), in=20
+which all processors
+ are set to their initial state. Pending cycles are not corrupted.
+
+ If this function returns, it means that the system does not support warm=
reset.
+**/
+VOID
+EFIAPI
+ResetWarm (
+ VOID
+ )
+{
+ // Warm Reset via SBI ecall
+ SbiSystemReset (SBI_SRST_RESET_TYPE_WARM_REBOOT,=20
+SBI_SRST_RESET_REASON_NONE); }
+
+/**
+ This function causes the system to enter a power state equivalent
+ to the ACPI G2/S5 or G3 states.
+
+ If this function returns, it means that the system does not support shut=
down reset.
+**/
+VOID
+EFIAPI
+ResetShutdown (
+ VOID
+ )
+{
+ // Shut down via SBI ecall
+ SbiSystemReset (SBI_SRST_RESET_TYPE_SHUTDOWN,=20
+SBI_SRST_RESET_REASON_NONE); }
+
+/**
+ This function causes a systemwide reset. The exact type of the reset=20
+is
+ defined by the EFI_GUID that follows the Null-terminated Unicode=20
+string passed
+ into ResetData. If the platform does not recognize the EFI_GUID in=20
+ResetData
+ the platform must pick a supported reset type to perform. The=20
+platform may
+ optionally log the parameters from any non-normal reset that occurs.
+
+ @param[in] DataSize The size, in bytes, of ResetData.
+ @param[in] ResetData The data buffer starts with a Null-terminated str=
ing,
+ followed by the EFI_GUID.
+**/
+VOID
+EFIAPI
+ResetPlatformSpecific (
+ IN UINTN DataSize,
+ IN VOID *ResetData
+ )
+{
+ //
+ // Can map to OpenSBI vendor or platform specific reset type.
+ //
+ return;
+}
+
+/**
+ The ResetSystem function resets the entire platform.
+
+ @param[in] ResetType The type of reset to perform.
+ @param[in] ResetStatus The status code for the reset.
+ @param[in] DataSize The size, in bytes, of ResetData.
+ @param[in] ResetData For a ResetType of EfiResetCold, EfiResetWarm,=
or EfiResetShutdown
+ the data buffer starts with a Null-terminated =
string, optionally
+ followed by additional binary data. The string=
is a description
+ that the caller may use to further indicate th=
e reason for the
+ system reset.
+**/
+VOID
+EFIAPI
+ResetSystem (
+ IN EFI_RESET_TYPE ResetType,
+ IN EFI_STATUS ResetStatus,
+ IN UINTN DataSize,
+ IN VOID *ResetData OPTIONAL
+ )
+{
+ switch (ResetType) {
+ case EfiResetWarm:
+ ResetWarm ();
+ break;
+
+ case EfiResetCold:
+ ResetCold ();
+ break;
+
+ case EfiResetShutdown:
+ ResetShutdown ();
+ return;
+
+ case EfiResetPlatformSpecific:
+ ResetPlatformSpecific (DataSize, ResetData);
+ return;
+
+ default:
+ return;
+ }
+}
--
2.38.0