5e27deed43
The primary FV contains the firmware boot image, which is not runtime updatable in our case. So exposing it to the NOR flash driver is undesirable, since it may attempt to modify the NOR flash contents. It is also rather pointless, since we don't keep anything there that we care to expose. (the SEC and PEI phase modules are not executable from DXE context, and the contents of the embedded DXE phase FV are exposed by the DXE core directly via the FVB2 protocol) So let's disregard the NOR flash block that covers the primary FV. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/** @file
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Copyright (c) 2014-2018, Linaro Ltd. 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 <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/NorFlashPlatformLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Protocol/FdtClient.h>
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#define QEMU_NOR_BLOCK_SIZE SIZE_256KB
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#define MAX_FLASH_BANKS 4
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EFI_STATUS
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NorFlashPlatformInitialization (
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VOID
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)
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{
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return EFI_SUCCESS;
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}
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NOR_FLASH_DESCRIPTION mNorFlashDevices[MAX_FLASH_BANKS];
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EFI_STATUS
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NorFlashPlatformGetDevices (
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OUT NOR_FLASH_DESCRIPTION **NorFlashDescriptions,
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OUT UINT32 *Count
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)
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{
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FDT_CLIENT_PROTOCOL *FdtClient;
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INT32 Node;
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EFI_STATUS Status;
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EFI_STATUS FindNodeStatus;
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CONST UINT32 *Reg;
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UINT32 PropSize;
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UINT32 Num;
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UINT64 Base;
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UINT64 Size;
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Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
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(VOID **)&FdtClient);
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ASSERT_EFI_ERROR (Status);
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Num = 0;
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for (FindNodeStatus = FdtClient->FindCompatibleNode (FdtClient,
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"cfi-flash", &Node);
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!EFI_ERROR (FindNodeStatus) && Num < MAX_FLASH_BANKS;
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FindNodeStatus = FdtClient->FindNextCompatibleNode (FdtClient,
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"cfi-flash", Node, &Node)) {
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Status = FdtClient->GetNodeProperty (FdtClient, Node, "reg",
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(CONST VOID **)&Reg, &PropSize);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "%a: GetNodeProperty () failed (Status == %r)\n",
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__FUNCTION__, Status));
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continue;
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}
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ASSERT ((PropSize % (4 * sizeof (UINT32))) == 0);
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while (PropSize >= (4 * sizeof (UINT32)) && Num < MAX_FLASH_BANKS) {
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Base = SwapBytes64 (ReadUnaligned64 ((VOID *)&Reg[0]));
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Size = SwapBytes64 (ReadUnaligned64 ((VOID *)&Reg[2]));
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Reg += 4;
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PropSize -= 4 * sizeof (UINT32);
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//
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// Disregard any flash devices that overlap with the primary FV.
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// The firmware is not updatable from inside the guest anyway.
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//
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if ((PcdGet64 (PcdFvBaseAddress) + PcdGet32 (PcdFvSize) > Base) &&
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(Base + Size) > PcdGet64 (PcdFvBaseAddress)) {
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continue;
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}
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mNorFlashDevices[Num].DeviceBaseAddress = (UINTN)Base;
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mNorFlashDevices[Num].RegionBaseAddress = (UINTN)Base;
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mNorFlashDevices[Num].Size = (UINTN)Size;
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mNorFlashDevices[Num].BlockSize = QEMU_NOR_BLOCK_SIZE;
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Num++;
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}
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}
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*NorFlashDescriptions = mNorFlashDevices;
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*Count = Num;
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return EFI_SUCCESS;
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}
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