e4a1d5a7c4
Commit:24e4ad7 (OvmfPkg: Add AmdSevDxe driver) added a driver which runs early in DXE phase and clears the C-bit from NonExistent entry -- which is later split and accommodate the flash MMIO. When SMM is enabled, we build two sets of page tables; first page table is used when executing code in non SMM mode (SMM-less-pgtable) and second page table is used when we are executing code in SMM mode (SMM-pgtable). During boot time, AmdSevDxe driver clears the C-bit from the SMM-less-pgtable. But when SMM is enabled, Qemu Flash services are used from SMM mode. In this patch we explicitly clear the C-bit from Qemu flash MMIO range before we probe the flash. When OVMF is built with SMM_REQUIRE then call to initialize the flash services happen after the SMM-pgtable is created and processor has served the first SMI. At this time we will have access to the SMM-pgtable. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> [lersek@redhat.com: trivial coding style improvements] Reviewed-by: Laszlo Ersek <lersek@redhat.com>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/** @file
|
|
OVMF support for QEMU system firmware flash device
|
|
|
|
Copyright (c) 2009 - 2013, 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.
|
|
|
|
**/
|
|
|
|
#ifndef __QEMU_FLASH_H__
|
|
#define __QEMU_FLASH_H__
|
|
|
|
#include <Protocol/FirmwareVolumeBlock.h>
|
|
|
|
extern UINT8 *mFlashBase;
|
|
|
|
/**
|
|
Read from QEMU Flash
|
|
|
|
@param[in] Lba The starting logical block index to read from.
|
|
@param[in] Offset Offset into the block at which to begin reading.
|
|
@param[in] NumBytes On input, indicates the requested read size. On
|
|
output, indicates the actual number of bytes read
|
|
@param[in] Buffer Pointer to the buffer to read into.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
QemuFlashRead (
|
|
IN EFI_LBA Lba,
|
|
IN UINTN Offset,
|
|
IN UINTN *NumBytes,
|
|
IN UINT8 *Buffer
|
|
);
|
|
|
|
|
|
/**
|
|
Write to QEMU Flash
|
|
|
|
@param[in] Lba The starting logical block index to write to.
|
|
@param[in] Offset Offset into the block at which to begin writing.
|
|
@param[in] NumBytes On input, indicates the requested write size. On
|
|
output, indicates the actual number of bytes written
|
|
@param[in] Buffer Pointer to the data to write.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
QemuFlashWrite (
|
|
IN EFI_LBA Lba,
|
|
IN UINTN Offset,
|
|
IN UINTN *NumBytes,
|
|
IN UINT8 *Buffer
|
|
);
|
|
|
|
|
|
/**
|
|
Erase a QEMU Flash block
|
|
|
|
@param Lba The logical block index to erase.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
QemuFlashEraseBlock (
|
|
IN EFI_LBA Lba
|
|
);
|
|
|
|
|
|
/**
|
|
Initializes QEMU flash memory support
|
|
|
|
@retval EFI_WRITE_PROTECTED The QEMU flash device is not present.
|
|
@retval EFI_SUCCESS The QEMU flash device is supported.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
QemuFlashInitialize (
|
|
VOID
|
|
);
|
|
|
|
|
|
VOID
|
|
QemuFlashConvertPointers (
|
|
VOID
|
|
);
|
|
|
|
VOID
|
|
QemuFlashBeforeProbe (
|
|
IN EFI_PHYSICAL_ADDRESS BaseAddress,
|
|
IN UINTN FdBlockSize,
|
|
IN UINTN FdBlockCount
|
|
);
|
|
|
|
#endif
|
|
|