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/** @file
Reset System lib using PSCI hypervisor or secure monitor calls
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) 2013, ARM Ltd. All rights reserved.<BR>
Copyright (c) 2014-2020, Linaro Ltd. All rights reserved.<BR>
Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <libfdt.h>
#include <Library/ArmHvcLib.h>
#include <Library/ArmSmcLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/ResetSystemLib.h>
#include <IndustryStandard/ArmStdSmc.h>
typedef enum {
PsciMethodUnknown,
PsciMethodSmc,
PsciMethodHvc,
} PSCI_METHOD;
STATIC
PSCI_METHOD
DiscoverPsciMethod (
VOID
)
{
VOID *DeviceTreeBase;
INT32 Node, Prev;
INT32 Len;
CONST CHAR8 *Compatible;
CONST CHAR8 *CompatibleItem;
CONST VOID *Prop;
DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
ASSERT (fdt_check_header (DeviceTreeBase) == 0);
//
// Enumerate all FDT nodes looking for the PSCI node and capture the method
//
for (Prev = 0; ; Prev = Node) {
Node = fdt_next_node (DeviceTreeBase, Prev, NULL);
if (Node < 0) {
break;
}
Compatible = fdt_getprop (DeviceTreeBase, Node, "compatible", &Len);
if (Compatible == NULL) {
continue;
}
//
// Iterate over the NULL-separated items in the compatible string
//
for (CompatibleItem = Compatible; CompatibleItem < Compatible + Len;
CompatibleItem += 1 + AsciiStrLen (CompatibleItem))
{
if (AsciiStrCmp (CompatibleItem, "arm,psci-0.2") != 0) {
continue;
}
Prop = fdt_getprop (DeviceTreeBase, Node, "method", NULL);
if (!Prop) {
DEBUG ((
DEBUG_ERROR,
"%a: Missing PSCI method property\n",
__func__
));
return PsciMethodUnknown;
}
if (AsciiStrnCmp (Prop, "hvc", 3) == 0) {
return PsciMethodHvc;
} else if (AsciiStrnCmp (Prop, "smc", 3) == 0) {
return PsciMethodSmc;
} else {
DEBUG ((
DEBUG_ERROR,
"%a: Unknown PSCI method \"%a\"\n",
__func__,
Prop
));
return PsciMethodUnknown;
}
}
}
return PsciMethodUnknown;
}
STATIC
VOID
PerformPsciAction (
IN UINTN Arg0
)
{
ARM_SMC_ARGS ArmSmcArgs;
ARM_HVC_ARGS ArmHvcArgs;
ArmSmcArgs.Arg0 = Arg0;
ArmHvcArgs.Arg0 = Arg0;
switch (DiscoverPsciMethod ()) {
case PsciMethodHvc:
ArmCallHvc (&ArmHvcArgs);
break;
case PsciMethodSmc:
ArmCallSmc (&ArmSmcArgs);
break;
default:
DEBUG ((DEBUG_ERROR, "%a: no PSCI method defined\n", __func__));
ASSERT (FALSE);
}
}
/**
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
PerformPsciAction (ARM_SMC_ID_PSCI_SYSTEM_RESET);
}
/**
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
)
{
// Map a warm reset into a cold reset
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
PerformPsciAction (ARM_SMC_ID_PSCI_SYSTEM_OFF);
}
/**
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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