/** @file
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System reset library services.
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Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi.h>
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#include <Library/IoLib.h>
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#include <Library/DebugLib.h>
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#include <Library/ResetSystemLib.h>
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#include <Library/PmcLib.h>
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#include <Library/BaseLib.h>
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#include <Register/PchRegsLpc.h>
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#include <Register/PmcRegs.h>
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GLOBAL_REMOVE_IF_UNREFERENCED UINT16 mBaseResetSystemABase;
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/**
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Calling this function causes a system-wide reset. This sets
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all circuitry within the system 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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System reset should not return, if it returns, it means the system does
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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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IoWrite8 (R_PCH_IO_RST_CNT, V_PCH_IO_RST_CNT_FULLRESET);
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}
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/**
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Calling this function causes a system-wide initialization. The processors
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are set to their initial state, and pending cycles are not corrupted.
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System reset should not return, if it returns, it means the system does
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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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IoWrite8 (R_PCH_IO_RST_CNT, V_PCH_IO_RST_CNT_HARDRESET);
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}
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/**
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Calling 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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System shutdown should not return, if it returns, it means the system does
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not support shut down 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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UINT16 ABase;
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UINT32 Data32;
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ABase = mBaseResetSystemABase;
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if (ABase == 0) {
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ABase = PmcGetAcpiBase ();
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}
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///
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/// Firstly, GPE0_EN should be disabled to avoid any GPI waking up the system from S5
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///
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IoWrite32 (ABase + R_ACPI_IO_GPE0_EN_127_96, 0);
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///
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/// Secondly, PwrSts register must be cleared
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///
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/// Write a "1" to bit[8] of power button status register at
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/// (PM_BASE + PM1_STS_OFFSET) to clear this bit
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///
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IoWrite16 (ABase + R_ACPI_IO_PM1_STS, B_ACPI_IO_PM1_STS_PWRBTN);
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///
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/// Finally, transform system into S5 sleep state
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///
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Data32 = IoRead32 (ABase + R_ACPI_IO_PM1_CNT);
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Data32 = (UINT32) ((Data32 &~(B_ACPI_IO_PM1_CNT_SLP_TYP + B_ACPI_IO_PM1_CNT_SLP_EN)) | V_ACPI_IO_PM1_CNT_S5);
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IoWrite32 (ABase + R_ACPI_IO_PM1_CNT, Data32);
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Data32 = Data32 | B_ACPI_IO_PM1_CNT_SLP_EN;
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IoWrite32 (ABase + R_ACPI_IO_PM1_CNT, Data32);
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return;
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}
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/**
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Calling this function causes the system to enter a power state for platform specific.
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@param[in] DataSize The size of ResetData in bytes.
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@param[in] ResetData Optional element used to introduce a platform specific reset.
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The exact type of the reset is defined by the EFI_GUID that follows
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the Null-terminated Unicode string.
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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 OPTIONAL
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)
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{
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IoWrite8 (R_PCH_IO_RST_CNT, V_PCH_IO_RST_CNT_FULLRESET);
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}
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/**
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Calling this function causes the system to enter a power state for capsule update.
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Reset update should not return, if it returns, it means the system does
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not support capsule update.
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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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//
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// In case there are pending capsules to process, need to flush the cache.
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//
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AsmWbinvd ();
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ResetWarm ();
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ASSERT (FALSE);
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}
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/**
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The library constructuor.
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The function does the necessary initialization work for this library instance.
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@retval EFI_SUCCESS The function always return EFI_SUCCESS for now.
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**/
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EFI_STATUS
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EFIAPI
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BaseResetSystemLibConstructor (
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VOID
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)
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{
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mBaseResetSystemABase = PmcGetAcpiBase ();
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return EFI_SUCCESS;
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}
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