dde2dd64f0
Implement ResetSystemLib's EnterS3WithImmediateWake() routine using a jump back to the PEI entry point with interrupts and MMU+caches disabled. This is only possible at boot time, when we are sure that the current CPU is the only one up and running. Also, it depends on the platform whether the PEI code is preserved in memory (it may be copied to DRAM rather than execute in place), so also add a feature PCD to selectively enable this feature. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/** @file
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ResetSystemLib implementation using PSCI calls
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Copyright (c) 2017, Linaro Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiDxe.h>
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#include <Library/ArmMmuLib.h>
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#include <Library/ArmSmcLib.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/ResetSystemLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeLib.h>
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#include <IndustryStandard/ArmStdSmc.h>
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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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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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ARM_SMC_ARGS ArmSmcArgs;
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// Send a PSCI 0.2 SYSTEM_RESET command
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ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
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ArmCallSmc (&ArmSmcArgs);
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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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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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// Map a warm reset into a cold reset
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ResetCold ();
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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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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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ARM_SMC_ARGS ArmSmcArgs;
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// Send a PSCI 0.2 SYSTEM_OFF command
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ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
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ArmCallSmc (&ArmSmcArgs);
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}
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/**
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This function causes the system to enter S3 and then wake up immediately.
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If this function returns, it means that the system does not support S3 feature.
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**/
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VOID
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EFIAPI
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EnterS3WithImmediateWake (
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VOID
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)
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{
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VOID (*Reset)(VOID);
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if (FeaturePcdGet (PcdArmReenterPeiForCapsuleWarmReboot) &&
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!EfiAtRuntime ()) {
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//
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// At boot time, we are the only core running, so we can implement the
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// immediate wake (which is used by capsule update) by disabling the MMU
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// and interrupts, and jumping to the PEI entry point.
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//
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Reset = (VOID (*)(VOID))(UINTN)FixedPcdGet64 (PcdFvBaseAddress);
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gBS->RaiseTPL (TPL_HIGH_LEVEL);
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ArmDisableMmu ();
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Reset ();
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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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@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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// Map the platform specific reset as reboot
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ResetCold ();
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}
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