From 50b91449a3a073af3a7c87af83002016e7e34cc4 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Thu, 24 Sep 2015 21:40:36 +0000 Subject: 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 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek Reviewed-by: Ard Biesheuvel git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18544 6f19259b-4bc3-4df7-8a09-765794883524 --- ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.c | 15 +++++++++++++++ ArmVirtPkg/VirtFdtDxe/VirtFdtDxe.inf | 1 + 2 files changed, 16 insertions(+) (limited to 'ArmVirtPkg/VirtFdtDxe') 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 -- cgit v1.2.3