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- /** @file
- Reset System Library functions for RISC-V
- Copyright (c) 2021, Hewlett Packard Development LP. All rights 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 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, SBI_SRST_RESET_REASON_NONE);
- }
- /**
- This function causes a system-wide initialization (warm reset), in 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, 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 shutdown reset.
- **/
- VOID
- EFIAPI
- ResetShutdown (
- VOID
- )
- {
- // Shut down via SBI ecall
- SbiSystemReset (SBI_SRST_RESET_TYPE_SHUTDOWN, SBI_SRST_RESET_REASON_NONE);
- }
- /**
- This function causes a systemwide reset. The exact type of the reset is
- defined by the EFI_GUID that follows the Null-terminated Unicode string passed
- into ResetData. If the platform does not recognize the EFI_GUID in ResetData
- the platform must pick a supported reset type to perform. The 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 string,
- 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 the 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;
- }
- }
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