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/** @file
This is the driver that publishes the SMM Control Protocol.
Copyright (c) 1999 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "SmmControlDriver.h"
#include <Library/ScPlatformLib.h>
STATIC SMM_CONTROL_PRIVATE_DATA mSmmControl;
GLOBAL_REMOVE_IF_UNREFERENCED UINT16 mAcpiBaseAddr;
VOID
EFIAPI
DisablePendingSmis (
VOID
);
/**
Fixup internal data pointers so that the services can be called in virtual mode.
@param[in] Event The event registered.
@param[in] Context Event context.
**/
VOID
EFIAPI
SmmControlVirtualAddressChangeEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
gRT->ConvertPointer (EFI_INTERNAL_POINTER, (VOID *) &(mSmmControl.SmmControl.Trigger));
gRT->ConvertPointer (EFI_INTERNAL_POINTER, (VOID *) &(mSmmControl.SmmControl.Clear));
}
/**
<b>SmmControl DXE RUNTIME Module Entry Point</b>\n
- <b>Introduction</b>\n
The SmmControl module is a DXE RUNTIME driver that provides a standard way
for other drivers to trigger software SMIs.
- @pre
- SC Power Management I/O space base address has already been programmed.
If SmmControl Runtime DXE driver is run before Status Code Runtime Protocol
is installed and there is the need to use Status code in the driver, it will
be necessary to add EFI_STATUS_CODE_RUNTIME_PROTOCOL_GUID to the dependency file.
- EFI_SMM_BASE2_PROTOCOL
- Documented in the System Management Mode Core Interface Specification.
- @result
The SmmControl driver produces the EFI_SMM_CONTROL_PROTOCOL documented in
System Management Mode Core Interface Specification.
@param[in] ImageHandle Handle for the image of this driver
@param[in] SystemTable Pointer to the EFI System Table
@retval EFI_STATUS Results of the installation of the SMM Control Protocol
**/
EFI_STATUS
EFIAPI
SmmControlDriverEntryInit (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT Event;
DEBUG ((DEBUG_INFO, "SmmControlDriverEntryInit() Start\n"));
//
// Get the Power Management I/O space base address. We assume that
// this base address has already been programmed if this driver is
// being run.
//
mAcpiBaseAddr = (UINT16) PcdGet16 (PcdScAcpiIoPortBaseAddress);
Status = EFI_SUCCESS;
if (mAcpiBaseAddr != 0) {
//
// Install the instance of the protocol
//
mSmmControl.Signature = SMM_CONTROL_PRIVATE_DATA_SIGNATURE;
mSmmControl.Handle = ImageHandle;
mSmmControl.SmmControl.Trigger = Activate;
mSmmControl.SmmControl.Clear = Deactivate;
mSmmControl.SmmControl.MinimumTriggerPeriod = 0;
//
// Install our protocol interfaces on the device's handle
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mSmmControl.Handle,
&gEfiSmmControl2ProtocolGuid,
&mSmmControl.SmmControl,
NULL
);
} else {
Status = EFI_DEVICE_ERROR;
return Status;
}
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
SmmControlVirtualAddressChangeEvent,
NULL,
&gEfiEventVirtualAddressChangeGuid,
&Event
);
//
// Disable any SC SMIs that, for whatever reason, are asserted after the boot.
//
DisablePendingSmis ();
DEBUG ((DEBUG_INFO, "SmmControlDriverEntryInit() End\n"));
return Status;
}
/**
Trigger the software SMI
@param[in] Data The value to be set on the software SMI data port
@retval EFI_SUCCESS Function completes successfully
**/
EFI_STATUS
EFIAPI
SmmTrigger (
IN UINT8 Data
)
{
UINT32 OutputData;
UINT32 OutputPort;
//
// Enable the APMC SMI
//
OutputPort = mAcpiBaseAddr + R_SMI_EN;
OutputData = IoRead32 ((UINTN) OutputPort);
OutputData |= (B_SMI_EN_APMC | B_SMI_EN_GBL_SMI);
IoWrite32 (
(UINTN) OutputPort,
(UINT32) (OutputData)
);
OutputPort = R_APM_CNT;
OutputData = Data;
//
// Generate the APMC SMI
//
IoWrite8 (
(UINTN) OutputPort,
(UINT8) (OutputData)
);
return EFI_SUCCESS;
}
/**
Clear the SMI status
@retval EFI_SUCCESS The function completes successfully
@retval EFI_DEVICE_ERROR Something error occurred
**/
EFI_STATUS
EFIAPI
SmmClear (
VOID
)
{
EFI_STATUS Status;
UINT32 OutputData;
UINT32 OutputPort;
Status = EFI_SUCCESS;
//
// Clear the Power Button Override Status Bit, it gates EOS from being set.
//
OutputPort = mAcpiBaseAddr + R_ACPI_PM1_STS;
OutputData = B_ACPI_PM1_STS_PRBTNOR;
IoWrite16 (
(UINTN) OutputPort,
(UINT16) (OutputData)
);
//
// Clear the APM SMI Status Bit
//
OutputPort = mAcpiBaseAddr + R_SMI_STS;
OutputData = B_SMI_STS_APM;
IoWrite32 (
(UINTN) OutputPort,
(UINT32) (OutputData)
);
//
// Set the EOS Bit
//
OutputPort = mAcpiBaseAddr + R_SMI_EN;
OutputData = IoRead32 ((UINTN) OutputPort);
OutputData |= B_SMI_EN_EOS;
IoWrite32 (
(UINTN) OutputPort,
(UINT32) (OutputData)
);
//
// There is no need to read EOS back and check if it is set.
// This can lead to a reading of zero if an SMI occurs right after the SMI_EN port read
// but before the data is returned to the CPU.
// SMM Dispatcher should make sure that EOS is set after all SMI sources are processed.
//
return Status;
}
/**
This routine generates an SMI
@param[in] This The EFI SMM Control protocol instance
@param[in, out] ArgumentBuffer The buffer of argument
@param[in, out] ArgumentBufferSize The size of the argument buffer
@param[in] Periodic Periodic or not
@param[in] ActivationInterval Interval of periodic SMI
@retval EFI Status Describing the result of the operation
@retval EFI_INVALID_PARAMETER Some parameter value passed is not supported
**/
EFI_STATUS
EFIAPI
Activate (
IN CONST EFI_SMM_CONTROL2_PROTOCOL * This,
IN OUT UINT8 *CommandPort OPTIONAL,
IN OUT UINT8 *DataPort OPTIONAL,
IN BOOLEAN Periodic OPTIONAL,
IN UINTN ActivationInterval OPTIONAL
)
{
EFI_STATUS Status;
UINT8 Data;
if (Periodic) {
return EFI_INVALID_PARAMETER;
}
if (CommandPort == NULL) {
Data = 0xFF;
} else {
Data = *CommandPort;
}
//
// Clear any pending the APM SMI
//
Status = SmmClear ();
if (EFI_ERROR (Status)) {
return Status;
}
return SmmTrigger (Data);
}
/**
This routine clears an SMI
@param[in] This The EFI SMM Control protocol instance
@param[in] Periodic Periodic or not
@retval EFI Status Describing the result of the operation
@retval EFI_INVALID_PARAMETER Some parameter value passed is not supported
**/
EFI_STATUS
EFIAPI
Deactivate (
IN CONST EFI_SMM_CONTROL2_PROTOCOL *This,
IN BOOLEAN Periodic OPTIONAL
)
{
if (Periodic) {
return EFI_INVALID_PARAMETER;
}
return SmmClear ();
}
/**
Disable all pending SMIs
**/
VOID
EFIAPI
DisablePendingSmis (
VOID
)
{
UINT32 Data;
UINT32 Port;
BOOLEAN SciEn;
//
// Determine whether an ACPI OS is present (via the SCI_EN bit)
//
Port = mAcpiBaseAddr + R_ACPI_PM1_CNT;
Data = IoRead16 ((UINTN) Port);
SciEn = (BOOLEAN) ((Data & B_ACPI_PM1_CNT_SCI_EN) == B_ACPI_PM1_CNT_SCI_EN);
if (!SciEn) {
//
// Clear any SMIs that double as SCIs (when SCI_EN==0)
//
Port = mAcpiBaseAddr + R_ACPI_PM1_STS;
Data = 0xFFFF;
IoWrite16 ((UINTN) Port, (UINT16) (Data));
Port = mAcpiBaseAddr + R_ACPI_PM1_EN;
Data = 0x0000;
IoWrite16 ((UINTN) Port, (UINT16) (Data));
Port = mAcpiBaseAddr + R_ACPI_PM1_CNT;
Data = 0x0000;
IoWrite16 ((UINTN) Port, (UINT16) (Data));
Port = mAcpiBaseAddr + R_ACPI_GPE0a_STS;
Data = 0xFFFFFFFF;
IoWrite32 ((UINTN) Port, (UINT32) (Data));
Port = mAcpiBaseAddr + R_ACPI_GPE0a_EN;
Data = 0x00000000;
IoWrite32 ((UINTN) Port, (UINT32) (Data));
}
//
// Clear and disable all SMIs that are unaffected by SCI_EN
//
#if (ENBDT_PF_ENABLE == 1)
#else
Port = mAcpiBaseAddr + R_ALT_GP_SMI_EN;
Data = 0x0000;
IoWrite16 ((UINTN) Port, (UINT16) (Data));
Port = mAcpiBaseAddr + R_ALT_GP_SMI_STS;
Data = 0xFFFF;
IoWrite16 ((UINTN) Port, (UINT16) (Data));
#endif
Port = mAcpiBaseAddr + R_SMI_STS;
Data = 0xFFFFFFFF;
IoWrite32 ((UINTN) Port, (UINT32) (Data));
//
// (Make sure to write this register last -- EOS re-enables SMIs for the SC)
//
Port = mAcpiBaseAddr + R_SMI_EN;
Data = IoRead32 ((UINTN) Port);
//
// clear all bits except those tied to SCI_EN
//
Data &= B_SMI_EN_BIOS_RLS;
//
// enable SMIs and specifically enable writes to APM_CNT.
//
Data |= B_SMI_EN_GBL_SMI | B_SMI_EN_APMC;
//
// NOTE: Default value of EOS is set in SC, it will be automatically cleared Once the SC asserts SMI# low,
// we don't need to do anything to clear it
//
IoWrite32 ((UINTN) Port, (UINT32) (Data));
}
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