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+/** @file
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+ Reset System Library functions for RISC-V
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+
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+ Copyright (c) 2021, Hewlett Packard Development LP. All rights reserved.<BR>
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+
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+**/
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+
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+#include <Library/DebugLib.h>
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+#include <Library/ResetSystemLib.h>
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+#include <Library/BaseRiscVSbiLib.h>
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+
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+/**
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+ This function causes a system-wide reset (cold reset), in which
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+ all circuitry within the system returns to its initial state. This type of reset
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+ is asynchronous to system operation and operates without regard to
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+ cycle boundaries.
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+
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+ If this function returns, it means that the system does not support cold reset.
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+**/
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+VOID
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+EFIAPI
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+ResetCold (
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+ VOID
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+ )
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+{
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+ // Warm Reset via SBI ecall
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+ SbiSystemReset (SBI_SRST_RESET_TYPE_COLD_REBOOT, SBI_SRST_RESET_REASON_NONE);
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+}
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+
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+/**
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+ This function causes a system-wide initialization (warm reset), in which all processors
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+ are set to their initial state. Pending cycles are not corrupted.
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+
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+ If this function returns, it means that the system does not support warm reset.
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+**/
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+VOID
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+EFIAPI
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+ResetWarm (
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+ VOID
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+ )
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+{
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+ // Warm Reset via SBI ecall
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+ SbiSystemReset (SBI_SRST_RESET_TYPE_WARM_REBOOT, SBI_SRST_RESET_REASON_NONE);
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+}
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+
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+/**
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+ This function causes the system to enter a power state equivalent
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+ to the ACPI G2/S5 or G3 states.
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+
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+ If this function returns, it means that the system does not support shutdown reset.
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+**/
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+VOID
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+EFIAPI
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+ResetShutdown (
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+ VOID
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+ )
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+{
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+ // Shut down via SBI ecall
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+ SbiSystemReset (SBI_SRST_RESET_TYPE_SHUTDOWN, SBI_SRST_RESET_REASON_NONE);
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+}
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+
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+/**
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+ This function causes a systemwide reset. The exact type of the reset is
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+ defined by the EFI_GUID that follows the Null-terminated Unicode string passed
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+ into ResetData. If the platform does not recognize the EFI_GUID in ResetData
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+ the platform must pick a supported reset type to perform. The platform may
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+ optionally log the parameters from any non-normal reset that occurs.
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+
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+ @param[in] DataSize The size, in bytes, of ResetData.
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+ @param[in] ResetData The data buffer starts with a Null-terminated string,
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+ followed by the EFI_GUID.
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+**/
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+VOID
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+EFIAPI
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+ResetPlatformSpecific (
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+ IN UINTN DataSize,
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+ IN VOID *ResetData
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+ )
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+{
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+ //
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+ // Can map to OpenSBI vendor or platform specific reset type.
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+ //
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+ return;
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+}
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+
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+/**
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+ The ResetSystem function resets the entire platform.
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+
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+ @param[in] ResetType The type of reset to perform.
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+ @param[in] ResetStatus The status code for the reset.
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+ @param[in] DataSize The size, in bytes, of ResetData.
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+ @param[in] ResetData For a ResetType of EfiResetCold, EfiResetWarm, or EfiResetShutdown
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+ the data buffer starts with a Null-terminated string, optionally
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+ followed by additional binary data. The string is a description
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+ that the caller may use to further indicate the reason for the
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+ system reset.
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+**/
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+VOID
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+EFIAPI
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+ResetSystem (
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+ IN EFI_RESET_TYPE ResetType,
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+ IN EFI_STATUS ResetStatus,
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+ IN UINTN DataSize,
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+ IN VOID *ResetData OPTIONAL
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+ )
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+{
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+ switch (ResetType) {
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+ case EfiResetWarm:
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+ ResetWarm ();
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+ break;
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+
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+ case EfiResetCold:
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+ ResetCold ();
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+ break;
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+
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+ case EfiResetShutdown:
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+ ResetShutdown ();
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+ return;
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+
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+ case EfiResetPlatformSpecific:
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+ ResetPlatformSpecific (DataSize, ResetData);
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+ return;
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+
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+ default:
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+ return;
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+ }
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+}
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