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/** @file
ResetSystemLib implementation using PSCI calls
Copyright (c) 2017 - 2018, Linaro Ltd. All rights reserved.<BR>
Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2022, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Library/ArmSmcLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/ResetSystemLib.h>
#include <IndustryStandard/ArmStdSmc.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
)
{
// Send a PSCI 0.2 SYSTEM_RESET command
ArmCallSmc0 (ARM_SMC_ID_PSCI_SYSTEM_RESET, NULL, NULL, NULL);
}
/**
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
)
{
UINTN Arg1;
UINTN Ret;
Arg1 = ARM_SMC_ID_PSCI_SYSTEM_RESET2_AARCH64;
// Is SYSTEM_RESET2 supported?
Ret = ArmCallSmc0 (ARM_SMC_ID_PSCI_FEATURES, &Arg1, NULL, NULL);
if (Ret == ARM_SMC_PSCI_RET_SUCCESS) {
// Send PSCI SYSTEM_RESET2 command
ArmCallSmc0 (Arg1, NULL, NULL, NULL);
} else {
// Map a warm reset into a cold reset
DEBUG ((
DEBUG_INFO,
"Warm reboot not supported by platform, issuing cold reboot\n"
));
ResetCold ();
}
}
/**
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
)
{
// Send a PSCI 0.2 SYSTEM_OFF command
ArmCallSmc0 (ARM_SMC_ID_PSCI_SYSTEM_OFF, NULL, NULL, NULL);
}
/**
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
)
{
// Map the platform specific reset as reboot
ResetCold ();
}
/**
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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