OvmfPkg: Add QemuFlashFvbServicesRuntimeDxe driver
If QEMU flash is detected, this module will install FirmwareVolumeBlock support for the QEMU flash device. It will also set PCDs with the results that: 1. OvmfPkg/EmuVariableFvbRuntimeDxe will be disabled 2. MdeModulePkg variable services will read/write flash directly Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Acked-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14839 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jordan Justen
jljusten
265
OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
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265
OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
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/** @file
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OVMF support for QEMU system firmware flash device
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Copyright (c) 2009 - 2013, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "PiDxe.h"
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/PcdLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeLib.h>
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#include <Guid/EventGroup.h>
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#include "QemuFlash.h"
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#define WRITE_BYTE_CMD 0x10
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#define BLOCK_ERASE_CMD 0x20
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#define CLEAR_STATUS_CMD 0x50
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#define READ_STATUS_CMD 0x70
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#define READ_DEVID_CMD 0x90
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#define BLOCK_ERASE_CONFIRM_CMD 0xd0
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#define READ_ARRAY_CMD 0xff
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#define CLEARED_ARRAY_STATUS 0x00
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STATIC UINT8 *mFlashBase = NULL;
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STATIC UINTN mFdBlockSize = 0;
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STATIC UINTN mFdBlockCount = 0;
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VOID
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QemuFlashConvertPointers (
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VOID
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)
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{
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EfiConvertPointer (0x0, (VOID **) &mFlashBase);
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}
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STATIC
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volatile UINT8*
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QemuFlashPtr (
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IN EFI_LBA Lba,
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IN UINTN Offset
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)
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{
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return mFlashBase + (Lba * mFdBlockSize) + Offset;
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}
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/**
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Determines if the QEMU flash memory device is present.
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@retval FALSE The QEMU flash device is not present.
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@retval TRUE The QEMU flash device is present.
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**/
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STATIC
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BOOLEAN
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QemuFlashDetected (
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VOID
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)
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{
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BOOLEAN FlashDetected;
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volatile UINT8 *Ptr;
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UINTN Offset;
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UINT8 OriginalUint8;
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UINT8 ProbeUint8;
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FlashDetected = FALSE;
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Ptr = QemuFlashPtr (0, 0);
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for (Offset = 0; Offset < mFdBlockSize; Offset++) {
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Ptr = QemuFlashPtr (0, Offset);
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ProbeUint8 = *Ptr;
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if (ProbeUint8 != CLEAR_STATUS_CMD &&
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ProbeUint8 != READ_STATUS_CMD &&
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ProbeUint8 != CLEARED_ARRAY_STATUS) {
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break;
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}
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}
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if (Offset >= mFdBlockSize) {
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DEBUG ((EFI_D_INFO, "QEMU Flash: Failed to find probe location\n"));
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return FALSE;
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}
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DEBUG ((EFI_D_INFO, "QEMU Flash: Attempting flash detection at %p\n", Ptr));
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OriginalUint8 = *Ptr;
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*Ptr = CLEAR_STATUS_CMD;
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ProbeUint8 = *Ptr;
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if (OriginalUint8 != CLEAR_STATUS_CMD &&
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ProbeUint8 == CLEAR_STATUS_CMD) {
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DEBUG ((EFI_D_INFO, "QemuFlashDetected => FD behaves as RAM\n"));
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*Ptr = OriginalUint8;
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} else {
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*Ptr = READ_STATUS_CMD;
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ProbeUint8 = *Ptr;
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if (ProbeUint8 == OriginalUint8) {
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DEBUG ((EFI_D_INFO, "QemuFlashDetected => FD behaves as ROM\n"));
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} else if (ProbeUint8 == READ_STATUS_CMD) {
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DEBUG ((EFI_D_INFO, "QemuFlashDetected => FD behaves as RAM\n"));
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*Ptr = OriginalUint8;
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} else if (ProbeUint8 == CLEARED_ARRAY_STATUS) {
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DEBUG ((EFI_D_INFO, "QemuFlashDetected => FD behaves as FLASH\n"));
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FlashDetected = TRUE;
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*Ptr = READ_ARRAY_CMD;
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}
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}
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DEBUG ((EFI_D_INFO, "QemuFlashDetected => %a\n",
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FlashDetected ? "Yes" : "No"));
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return FlashDetected;
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}
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/**
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Read from QEMU Flash
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@param[in] Lba The starting logical block index to read from.
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@param[in] Offset Offset into the block at which to begin reading.
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@param[in] NumBytes On input, indicates the requested read size. On
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output, indicates the actual number of bytes read
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@param[in] Buffer Pointer to the buffer to read into.
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**/
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EFI_STATUS
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QemuFlashRead (
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IN EFI_LBA Lba,
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IN UINTN Offset,
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IN UINTN *NumBytes,
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IN UINT8 *Buffer
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)
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{
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UINT8 *Ptr;
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//
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// Only write to the first 64k. We don't bother saving the FTW Spare
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// block into the flash memory.
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//
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if (Lba >= mFdBlockCount) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Get flash address
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//
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Ptr = (UINT8*) QemuFlashPtr (Lba, Offset);
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CopyMem (Buffer, Ptr, *NumBytes);
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return EFI_SUCCESS;
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}
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/**
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Write to QEMU Flash
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@param[in] Lba The starting logical block index to write to.
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@param[in] Offset Offset into the block at which to begin writing.
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@param[in] NumBytes On input, indicates the requested write size. On
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output, indicates the actual number of bytes written
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@param[in] Buffer Pointer to the data to write.
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**/
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EFI_STATUS
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QemuFlashWrite (
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IN EFI_LBA Lba,
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IN UINTN Offset,
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IN UINTN *NumBytes,
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IN UINT8 *Buffer
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)
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{
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volatile UINT8 *Ptr;
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UINTN Loop;
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//
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// Only write to the first 64k. We don't bother saving the FTW Spare
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// block into the flash memory.
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//
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if (Lba >= mFdBlockCount) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Program flash
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//
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Ptr = QemuFlashPtr (Lba, Offset);
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for (Loop = 0; Loop < *NumBytes; Loop++) {
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*Ptr = WRITE_BYTE_CMD;
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*Ptr = Buffer[Loop];
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Ptr++;
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}
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//
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// Restore flash to read mode
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//
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if (*NumBytes > 0) {
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*Ptr = READ_ARRAY_CMD;
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}
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return EFI_SUCCESS;
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}
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/**
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Erase a QEMU Flash block
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@param Lba The logical block index to erase.
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**/
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EFI_STATUS
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QemuFlashEraseBlock (
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IN EFI_LBA Lba
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)
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{
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volatile UINT8 *Ptr;
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if (Lba >= mFdBlockCount) {
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return EFI_INVALID_PARAMETER;
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}
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Ptr = QemuFlashPtr (Lba, 0);
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*Ptr = BLOCK_ERASE_CMD;
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*Ptr = BLOCK_ERASE_CONFIRM_CMD;
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return EFI_SUCCESS;
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}
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/**
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Initializes QEMU flash memory support
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@retval EFI_WRITE_PROTECTED The QEMU flash device is not present.
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@retval EFI_SUCCESS The QEMU flash device is supported.
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**/
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EFI_STATUS
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QemuFlashInitialize (
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VOID
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)
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{
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mFlashBase = (UINT8*)(UINTN) PcdGet32 (PcdOvmfFdBaseAddress);
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mFdBlockSize = PcdGet32 (PcdOvmfFirmwareBlockSize);
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ASSERT(PcdGet32 (PcdOvmfFirmwareFdSize) % mFdBlockSize == 0);
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mFdBlockCount = PcdGet32 (PcdOvmfFirmwareFdSize) / mFdBlockSize;
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if (!QemuFlashDetected ()) {
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return EFI_WRITE_PROTECTED;
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}
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return EFI_SUCCESS;
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}
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