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| author | Laszlo Ersek <lersek@redhat.com> | 2015-09-24 21:40:36 +0000 |
|---|---|---|
| committer | lersek <lersek@Edk2> | 2015-09-24 21:40:36 +0000 |
| commit | 50b91449a3a073af3a7c87af83002016e7e34cc4 (patch) | |
| tree | cd8f396193928b044d9a5d1cd841d0bf5293dcfb /ArmVirtPkg/VirtFdtDxe | |
| parent | 6add86ab5967931ef9bca871931443e69f9cc09d (diff) | |
| download | edk2-50b91449a3a073af3a7c87af83002016e7e34cc4.tar.gz edk2-50b91449a3a073af3a7c87af83002016e7e34cc4.tar.bz2 edk2-50b91449a3a073af3a7c87af83002016e7e34cc4.zip | |
ArmVirtPkg: VirtFdtDxe: detect fw-cfg DMA interface from the DTB
A DMA-like transfer interface has recently been implemented in QEMU for
fw-cfg. For ARM and AARCH64 virtual machines, the binding prescribes a new
8-byte wide register at offset 0x10 in the register block. Make VirtFdtDxe
expose this register if it is present.
Please see "docs/specs/fw_cfg.txt" in the QEMU tree for more information.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18544 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmVirtPkg/VirtFdtDxe')
| -rw-r--r-- | ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c | 15 | ||||
| -rw-r--r-- | ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c b/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c index 73db63078f..74f80d1d2b 100644 --- a/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c +++ b/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c @@ -302,6 +302,8 @@ InitializeVirtFdtDxe ( UINT64 FwCfgSelectorSize;
UINT64 FwCfgDataAddress;
UINT64 FwCfgDataSize;
+ UINT64 FwCfgDmaAddress;
+ UINT64 FwCfgDmaSize;
Hob = GetFirstGuidHob(&gFdtHobGuid);
if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) {
@@ -382,6 +384,19 @@ InitializeVirtFdtDxe ( DEBUG ((EFI_D_INFO, "Found FwCfg @ 0x%Lx/0x%Lx\n", FwCfgSelectorAddress,
FwCfgDataAddress));
+
+ if (fdt64_to_cpu (((UINT64 *)RegProp)[1]) >= 0x18) {
+ FwCfgDmaAddress = FwCfgDataAddress + 0x10;
+ FwCfgDmaSize = 0x08;
+
+ //
+ // See explanation above.
+ //
+ ASSERT (FwCfgDmaAddress <= MAX_UINTN - FwCfgDmaSize + 1);
+
+ PcdSet64 (PcdFwCfgDmaAddress, FwCfgDmaAddress);
+ DEBUG ((EFI_D_INFO, "Found FwCfg DMA @ 0x%Lx\n", FwCfgDmaAddress));
+ }
break;
case PropertyTypeVirtio:
diff --git a/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf b/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf index 657b4e8801..ee2503ac4a 100644 --- a/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf +++ b/ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf @@ -53,6 +53,7 @@ gArmVirtTokenSpaceGuid.PcdArmPsciMethod
gArmVirtTokenSpaceGuid.PcdFwCfgSelectorAddress
gArmVirtTokenSpaceGuid.PcdFwCfgDataAddress
+ gArmVirtTokenSpaceGuid.PcdFwCfgDmaAddress
gArmVirtTokenSpaceGuid.PcdArmGicRevision
gArmTokenSpaceGuid.PcdGicDistributorBase
gArmTokenSpaceGuid.PcdGicRedistributorsBase
|