9dd47eeea1
EFI driver implementing the MmCommunication2Protocol, but instead of trapping to MM mode (SMM on x86, el3 on arm) trap to the host, using a virtual device. Moving the efi variable management to the host allows to have persistent efi variables without flash storage, and it also allows to have secure boot support without requiring MM mode to protect variable storage in flash. On x86 etc/hardware-info is used for device discovery, on arm the FDT will be consulted. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/** @file
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <IndustryStandard/QemuFwCfg.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/DxeServicesTableLib.h>
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#include <Library/HardwareInfoLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/QemuFwCfgLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include "VirtMmCommunication.h"
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EFI_STATUS
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EFIAPI
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VirtMmHwFind (
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VOID
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)
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{
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FIRMWARE_CONFIG_ITEM FwCfgItem;
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UINTN FwCfgSize;
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VOID *HardwareInfoBlob;
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LIST_ENTRY HwInfoList;
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LIST_ENTRY *HwLink;
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HARDWARE_INFO *HwInfo;
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UINTN Count;
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EFI_STATUS Status;
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Status = QemuFwCfgFindFile ("etc/hardware-info", &FwCfgItem, &FwCfgSize);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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DEBUG ((DEBUG_INFO, "%a: etc/hardware-info: exists\n", __func__));
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HardwareInfoBlob = AllocatePool (FwCfgSize);
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if (HardwareInfoBlob == NULL) {
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return RETURN_OUT_OF_RESOURCES;
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}
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QemuFwCfgSelectItem (FwCfgItem);
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QemuFwCfgReadBytes (FwCfgSize, HardwareInfoBlob);
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InitializeListHead (&HwInfoList);
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Status = CreateHardwareInfoList (
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HardwareInfoBlob,
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FwCfgSize,
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HardwareInfoTypeQemuUefiVars,
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&HwInfoList
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);
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Count = GetHardwareInfoCountByType (
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&HwInfoList,
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HardwareInfoTypeQemuUefiVars,
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sizeof (SIMPLE_INFO)
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);
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if (Count != 1) {
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FreeHardwareInfoList (&HwInfoList);
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FreePool (HardwareInfoBlob);
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return RETURN_NOT_FOUND;
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}
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HwLink = GetFirstHardwareInfoByType (
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&HwInfoList,
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HardwareInfoTypeQemuUefiVars,
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sizeof (SIMPLE_INFO)
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);
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HwInfo = HARDWARE_INFO_FROM_LINK (HwLink);
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mUefiVarsAddr = HwInfo->Data.SimpleDevice->MmioAddress;
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DEBUG ((DEBUG_INFO, "%a: etc/hardware-info: uefi vars mmio @ 0x%lx\n", __func__, mUefiVarsAddr));
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FreeHardwareInfoList (&HwInfoList);
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FreePool (HardwareInfoBlob);
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return RETURN_SUCCESS;
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}
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