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/** @file
*
* Copyright (c) 2017, Linaro, Ltd. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <Uefi.h>
#include <IndustryStandard/Acpi.h>
#include <libfdt.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/HiiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Protocol/AcpiTable.h>
#include <Protocol/AcpiSystemDescriptionTable.h>
#include "ConsolePrefDxe.h"
#define SPCR_SIG EFI_ACPI_2_0_SERIAL_PORT_CONSOLE_REDIRECTION_TABLE_SIGNATURE
extern UINT8 ConsolePrefHiiBin[];
extern UINT8 ConsolePrefDxeStrings[];
typedef struct {
VENDOR_DEVICE_PATH VendorDevicePath;
EFI_DEVICE_PATH_PROTOCOL End;
} HII_VENDOR_DEVICE_PATH;
STATIC HII_VENDOR_DEVICE_PATH mConsolePrefDxeVendorDevicePath = {
{
{
HARDWARE_DEVICE_PATH,
HW_VENDOR_DP,
{
(UINT8) (sizeof (VENDOR_DEVICE_PATH)),
(UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
}
},
CONSOLE_PREF_FORMSET_GUID
},
{
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
(UINT8) (END_DEVICE_PATH_LENGTH),
(UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
}
}
};
STATIC EFI_EVENT mReadyToBootEvent;
STATIC
EFI_STATUS
InstallHiiPages (
VOID
)
{
EFI_STATUS Status;
EFI_HII_HANDLE HiiHandle;
EFI_HANDLE DriverHandle;
DriverHandle = NULL;
Status = gBS->InstallMultipleProtocolInterfaces (&DriverHandle,
&gEfiDevicePathProtocolGuid,
&mConsolePrefDxeVendorDevicePath,
NULL);
if (EFI_ERROR (Status)) {
return Status;
}
HiiHandle = HiiAddPackages (&gConsolePrefFormSetGuid,
DriverHandle,
ConsolePrefDxeStrings,
ConsolePrefHiiBin,
NULL);
if (HiiHandle == NULL) {
gBS->UninstallMultipleProtocolInterfaces (DriverHandle,
&gEfiDevicePathProtocolGuid,
&mConsolePrefDxeVendorDevicePath,
NULL);
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
STATIC
VOID
RemoveDtStdoutPath (
VOID
)
{
VOID *Dtb;
INT32 Node;
INT32 Error;
EFI_STATUS Status;
Status = EfiGetSystemConfigurationTable (&gFdtTableGuid, &Dtb);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO, "%a: could not retrieve DT blob - %r\n", __FUNCTION__,
Status));
return;
}
Node = fdt_path_offset (Dtb, "/chosen");
if (Node < 0) {
return;
}
Error = fdt_delprop (Dtb, Node, "stdout-path");
if (Error) {
DEBUG ((DEBUG_INFO, "%a: Failed to delete 'stdout-path' property: %a\n",
__FUNCTION__, fdt_strerror (Error)));
}
}
STATIC
VOID
RemoveSpcrTable (
VOID
)
{
EFI_ACPI_SDT_PROTOCOL *Sdt;
EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
EFI_STATUS Status;
UINTN TableIndex;
EFI_ACPI_SDT_HEADER *TableHeader;
EFI_ACPI_TABLE_VERSION TableVersion;
UINTN TableKey;
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL,
(VOID **)&AcpiTable);
if (EFI_ERROR (Status)) {
return;
}
Status = gBS->LocateProtocol (&gEfiAcpiSdtProtocolGuid, NULL, (VOID **)&Sdt);
if (EFI_ERROR (Status)) {
return;
}
TableIndex = 0;
TableKey = 0;
TableHeader = NULL;
do {
Status = Sdt->GetAcpiTable (TableIndex++, &TableHeader, &TableVersion,
&TableKey);
if (EFI_ERROR (Status)) {
break;
}
if (TableHeader->Signature != SPCR_SIG) {
continue;
}
Status = AcpiTable->UninstallAcpiTable (AcpiTable, TableKey);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_WARN, "%a: failed to uninstall SPCR table - %r\n",
__FUNCTION__, Status));
}
break;
} while (TRUE);
}
STATIC
VOID
EFIAPI
OnReadyToBoot (
IN EFI_EVENT Event,
IN VOID *Context
)
{
CONSOLE_PREF_VARSTORE_DATA ConsolePref;
UINTN BufferSize;
EFI_STATUS Status;
VOID *Gop;
BufferSize = sizeof (ConsolePref);
Status = gRT->GetVariable (CONSOLE_PREF_VARIABLE_NAME,
&gConsolePrefFormSetGuid, NULL, &BufferSize, &ConsolePref);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR,
"%a: variable '%s' could not be read - bailing!\n", __FUNCTION__,
CONSOLE_PREF_VARIABLE_NAME));
return;
}
if (ConsolePref.Console == CONSOLE_PREF_SERIAL) {
DEBUG ((DEBUG_INFO,
"%a: serial console preferred - doing nothing\n", __FUNCTION__));
return;
}
//
// Check if any GOP instances exist: if so, disable stdout-path and SPCR
//
Status = gBS->LocateProtocol (&gEfiGraphicsOutputProtocolGuid, NULL, &Gop);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO,
"%a: no GOP instances found - doing nothing (%r)\n", __FUNCTION__,
Status));
return;
}
RemoveDtStdoutPath ();
RemoveSpcrTable ();
}
/**
The entry point for ConsolePrefDxe driver.
@param[in] ImageHandle The image handle of the driver.
@param[in] SystemTable The system table.
@retval EFI_ALREADY_STARTED The driver already exists in system.
@retval EFI_OUT_OF_RESOURCES Fail to execute entry point due to lack of
resources.
@retval EFI_SUCCESS All the related protocols are installed on
the driver.
**/
EFI_STATUS
EFIAPI
ConsolePrefDxeEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
CONSOLE_PREF_VARSTORE_DATA ConsolePref;
UINTN BufferSize;
//
// Get the current console preference from the ConsolePref variable.
//
BufferSize = sizeof (ConsolePref);
Status = gRT->GetVariable (CONSOLE_PREF_VARIABLE_NAME,
&gConsolePrefFormSetGuid, NULL, &BufferSize, &ConsolePref);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO,
"%a: no console preference found, defaulting to graphical\n",
__FUNCTION__));
ConsolePref.Console = CONSOLE_PREF_GRAPHICAL;
}
if (!EFI_ERROR (Status) &&
ConsolePref.Console != CONSOLE_PREF_GRAPHICAL &&
ConsolePref.Console != CONSOLE_PREF_SERIAL) {
DEBUG ((DEBUG_WARN, "%a: invalid value for %s, defaulting to graphical\n",
__FUNCTION__, CONSOLE_PREF_VARIABLE_NAME));
ConsolePref.Console = CONSOLE_PREF_GRAPHICAL;
Status = EFI_INVALID_PARAMETER; // trigger setvar below
}
//
// Write the newly selected value back to the variable store.
//
if (EFI_ERROR (Status)) {
ZeroMem (&ConsolePref.Reserved, sizeof (ConsolePref.Reserved));
Status = gRT->SetVariable (CONSOLE_PREF_VARIABLE_NAME,
&gConsolePrefFormSetGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,
sizeof (ConsolePref), &ConsolePref);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: gRT->SetVariable () failed - %r\n",
__FUNCTION__, Status));
return Status;
}
}
Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
OnReadyToBoot, NULL, &gEfiEventReadyToBootGuid,
&mReadyToBootEvent);
ASSERT_EFI_ERROR (Status);
return InstallHiiPages ();
}
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