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ArmVirtPkg/NorFlashQemuLib: discover NOR flash banks dynamically 

NorFlashQemuLib is one of the last remaining drivers in ArmVirtPkg
that are not based on the device tree received from QEMU.

For ArmVirtQemu, this does not really matter, given that the NOR
flash banks are always the same: the PEI code is linked to execute
in place from flash bank #0, and the fixed varstore PCDs refer to
flash bank #1 directly.

However, ArmVirtQemuKernel can execute at any offset, permitting it
to be used as an intermediary loader when running QEMU with secure
world emulation enabled, in which case NOR flash bank #0 is secure
only and contains the secure world firmware. In this case,
NorFlashQemuLib should not expose the first flash bank at all.

To prevent introducing too much internal knowledge about which flash
bank is accessible under which circumstances, let's switch to using
the DTB to decide which flash banks to expose to the NOR flash driver.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Ard Biesheuvel 2018-11-21 12:58:27 +01:00
parent 32f5975770
commit 72e514c907
2 changed files with 69 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.c
View File

@ -1,6 +1,6 @@
/** @file
Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
Copyright (c) 2014-2018, Linaro Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@ -12,13 +12,16 @@
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/NorFlashPlatformLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/FdtClient.h>
#define QEMU_NOR_BLOCK_SIZE SIZE_256KB
#define QEMU_NOR0_BASE 0x0
#define QEMU_NOR0_SIZE SIZE_64MB
#define QEMU_NOR1_BASE 0x04000000
#define QEMU_NOR1_SIZE SIZE_64MB
#define MAX_FLASH_BANKS 4
EFI_STATUS
NorFlashPlatformInitialization (
@ -28,21 +31,7 @@ NorFlashPlatformInitialization (
return EFI_SUCCESS;
}
NOR_FLASH_DESCRIPTION mNorFlashDevices[] = {
{
QEMU_NOR0_BASE,
QEMU_NOR0_BASE,
QEMU_NOR0_SIZE,
QEMU_NOR_BLOCK_SIZE,
{0xF9B94AE2, 0x8BA6, 0x409B, {0x9D, 0x56, 0xB9, 0xB4, 0x17, 0xF5, 0x3C, 0xB3}}
}, {
QEMU_NOR1_BASE,
QEMU_NOR1_BASE,
QEMU_NOR1_SIZE,
QEMU_NOR_BLOCK_SIZE,
{0x8047DB4B, 0x7E9C, 0x4C0C, {0x8E, 0xBC, 0xDF, 0xBB, 0xAA, 0xCA, 0xCE, 0x8F}}
}
};
NOR_FLASH_DESCRIPTION mNorFlashDevices[MAX_FLASH_BANKS];
EFI_STATUS
NorFlashPlatformGetDevices (
@ -50,7 +39,54 @@ NorFlashPlatformGetDevices (
OUT UINT32 *Count
)
{
FDT_CLIENT_PROTOCOL *FdtClient;
INT32 Node;
EFI_STATUS Status;
EFI_STATUS FindNodeStatus;
CONST UINT32 *Reg;
UINT32 PropSize;
UINT32 Num;
UINT64 Base;
UINT64 Size;
Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
(VOID **)&FdtClient);
ASSERT_EFI_ERROR (Status);
Num = 0;
for (FindNodeStatus = FdtClient->FindCompatibleNode (FdtClient,
"cfi-flash", &Node);
!EFI_ERROR (FindNodeStatus) && Num < MAX_FLASH_BANKS;
FindNodeStatus = FdtClient->FindNextCompatibleNode (FdtClient,
"cfi-flash", Node, &Node)) {
Status = FdtClient->GetNodeProperty (FdtClient, Node, "reg",
(CONST VOID **)&Reg, &PropSize);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: GetNodeProperty () failed (Status == %r)\n",
__FUNCTION__, Status));
continue;
}
ASSERT ((PropSize % (4 * sizeof (UINT32))) == 0);
while (PropSize >= (4 * sizeof (UINT32)) && Num < MAX_FLASH_BANKS) {
Base = SwapBytes64 (ReadUnaligned64 ((VOID *)&Reg[0]));
Size = SwapBytes64 (ReadUnaligned64 ((VOID *)&Reg[2]));
Reg += 4;
mNorFlashDevices[Num].DeviceBaseAddress = (UINTN)Base;
mNorFlashDevices[Num].RegionBaseAddress = (UINTN)Base;
mNorFlashDevices[Num].Size = (UINTN)Size;
mNorFlashDevices[Num].BlockSize = QEMU_NOR_BLOCK_SIZE;
Num++;
PropSize -= 4 * sizeof (UINT32);
}
}
*NorFlashDescriptions = mNorFlashDevices;
*Count = ARRAY_SIZE (mNorFlashDevices);
*Count = Num;
return EFI_SUCCESS;
}

12
ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.inf
View File

@ -28,3 +28,15 @@
[Packages]
MdePkg/MdePkg.dec
ArmPlatformPkg/ArmPlatformPkg.dec
ArmVirtPkg/ArmVirtPkg.dec
[LibraryClasses]
BaseLib
DebugLib
UefiBootServicesTableLib
[Protocols]
gFdtClientProtocolGuid ## CONSUMES
[Depex]
gFdtClientProtocolGuid