| /** @file | |
| * Device tree enumeration DXE driver for ARM Virtual Machines | |
| * | |
| * Copyright (c) 2014, 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 | |
| * which accompanies this distribution. The full text of the license may be found at | |
| * http://opensource.org/licenses/bsd-license.php | |
| * | |
| * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| * | |
| **/ | |
| #include <Library/BaseLib.h> | |
| #include <Library/DebugLib.h> | |
| #include <Library/UefiLib.h> | |
| #include <Library/BaseMemoryLib.h> | |
| #include <Library/UefiDriverEntryPoint.h> | |
| #include <Library/MemoryAllocationLib.h> | |
| #include <Library/UefiBootServicesTableLib.h> | |
| #include <Library/VirtioMmioDeviceLib.h> | |
| #include <Library/DevicePathLib.h> | |
| #include <Library/PcdLib.h> | |
| #include <Library/DxeServicesLib.h> | |
| #include <Library/HobLib.h> | |
| #include <libfdt.h> | |
| #include <Library/XenIoMmioLib.h> | |
| #include <Guid/Fdt.h> | |
| #include <Guid/VirtioMmioTransport.h> | |
| #include <Guid/FdtHob.h> | |
| #pragma pack (1) | |
| typedef struct { | |
| VENDOR_DEVICE_PATH Vendor; | |
| UINT64 PhysBase; | |
| EFI_DEVICE_PATH_PROTOCOL End; | |
| } VIRTIO_TRANSPORT_DEVICE_PATH; | |
| #pragma pack () | |
| typedef enum { | |
| PropertyTypeUnknown, | |
| PropertyTypeGic, | |
| PropertyTypeRtc, | |
| PropertyTypeVirtio, | |
| PropertyTypeUart, | |
| PropertyTypeTimer, | |
| PropertyTypePsci, | |
| PropertyTypeFwCfg, | |
| PropertyTypePciHost, | |
| PropertyTypeGicV3, | |
| PropertyTypeXen, | |
| } PROPERTY_TYPE; | |
| typedef struct { | |
| PROPERTY_TYPE Type; | |
| CHAR8 Compatible[32]; | |
| } PROPERTY; | |
| STATIC CONST PROPERTY CompatibleProperties[] = { | |
| { PropertyTypeGic, "arm,cortex-a15-gic" }, | |
| { PropertyTypeRtc, "arm,pl031" }, | |
| { PropertyTypeVirtio, "virtio,mmio" }, | |
| { PropertyTypeUart, "arm,pl011" }, | |
| { PropertyTypeTimer, "arm,armv7-timer" }, | |
| { PropertyTypeTimer, "arm,armv8-timer" }, | |
| { PropertyTypePsci, "arm,psci-0.2" }, | |
| { PropertyTypeFwCfg, "qemu,fw-cfg-mmio" }, | |
| { PropertyTypePciHost, "pci-host-ecam-generic" }, | |
| { PropertyTypeGicV3, "arm,gic-v3" }, | |
| { PropertyTypeXen, "xen,xen" }, | |
| { PropertyTypeUnknown, "" } | |
| }; | |
| typedef struct { | |
| UINT32 Type; | |
| UINT32 Number; | |
| UINT32 Flags; | |
| } INTERRUPT_PROPERTY; | |
| STATIC | |
| PROPERTY_TYPE | |
| GetTypeFromNode ( | |
| IN CONST CHAR8 *NodeType, | |
| IN UINTN Size | |
| ) | |
| { | |
| CONST CHAR8 *Compatible; | |
| CONST PROPERTY *CompatibleProperty; | |
| // | |
| // A 'compatible' node may contain a sequence of NULL terminated | |
| // compatible strings so check each one | |
| // | |
| for (Compatible = NodeType; Compatible < NodeType + Size && *Compatible; | |
| Compatible += 1 + AsciiStrLen (Compatible)) { | |
| for (CompatibleProperty = CompatibleProperties; CompatibleProperty->Compatible[0]; CompatibleProperty++) { | |
| if (AsciiStrCmp (CompatibleProperty->Compatible, Compatible) == 0) { | |
| return CompatibleProperty->Type; | |
| } | |
| } | |
| } | |
| return PropertyTypeUnknown; | |
| } | |
| // | |
| // We expect the "ranges" property of "pci-host-ecam-generic" to consist of | |
| // records like this. | |
| // | |
| #pragma pack (1) | |
| typedef struct { | |
| UINT32 Type; | |
| UINT64 ChildBase; | |
| UINT64 CpuBase; | |
| UINT64 Size; | |
| } DTB_PCI_HOST_RANGE_RECORD; | |
| #pragma pack () | |
| #define DTB_PCI_HOST_RANGE_RELOCATABLE BIT31 | |
| #define DTB_PCI_HOST_RANGE_PREFETCHABLE BIT30 | |
| #define DTB_PCI_HOST_RANGE_ALIASED BIT29 | |
| #define DTB_PCI_HOST_RANGE_MMIO32 BIT25 | |
| #define DTB_PCI_HOST_RANGE_MMIO64 (BIT25 | BIT24) | |
| #define DTB_PCI_HOST_RANGE_IO BIT24 | |
| #define DTB_PCI_HOST_RANGE_TYPEMASK (BIT31 | BIT30 | BIT29 | BIT25 | BIT24) | |
| /** | |
| Process the device tree node describing the generic PCI host controller. | |
| param[in] DeviceTreeBase Pointer to the device tree. | |
| param[in] Node Offset of the device tree node whose "compatible" | |
| property is "pci-host-ecam-generic". | |
| param[in] RegProp Pointer to the "reg" property of Node. The caller | |
| is responsible for ensuring that the size of the | |
| property is 4 UINT32 cells. | |
| @retval EFI_SUCCESS Parsing successful, properties parsed from Node | |
| have been stored in dynamic PCDs. | |
| @retval EFI_PROTOCOL_ERROR Parsing failed. PCDs are left unchanged. | |
| **/ | |
| STATIC | |
| EFI_STATUS | |
| EFIAPI | |
| ProcessPciHost ( | |
| IN CONST VOID *DeviceTreeBase, | |
| IN INT32 Node, | |
| IN CONST VOID *RegProp | |
| ) | |
| { | |
| UINT64 ConfigBase, ConfigSize; | |
| CONST VOID *Prop; | |
| INT32 Len; | |
| UINT32 BusMin, BusMax; | |
| UINT32 RecordIdx; | |
| UINT64 IoBase, IoSize, IoTranslation; | |
| UINT64 MmioBase, MmioSize, MmioTranslation; | |
| // | |
| // Fetch the ECAM window. | |
| // | |
| ConfigBase = fdt64_to_cpu (((CONST UINT64 *)RegProp)[0]); | |
| ConfigSize = fdt64_to_cpu (((CONST UINT64 *)RegProp)[1]); | |
| // | |
| // Fetch the bus range (note: inclusive). | |
| // | |
| Prop = fdt_getprop (DeviceTreeBase, Node, "bus-range", &Len); | |
| if (Prop == NULL || Len != 2 * sizeof(UINT32)) { | |
| DEBUG ((EFI_D_ERROR, "%a: 'bus-range' not found or invalid\n", | |
| __FUNCTION__)); | |
| return EFI_PROTOCOL_ERROR; | |
| } | |
| BusMin = fdt32_to_cpu (((CONST UINT32 *)Prop)[0]); | |
| BusMax = fdt32_to_cpu (((CONST UINT32 *)Prop)[1]); | |
| // | |
| // Sanity check: the config space must accommodate all 4K register bytes of | |
| // all 8 functions of all 32 devices of all buses. | |
| // | |
| if (BusMax < BusMin || BusMax - BusMin == MAX_UINT32 || | |
| DivU64x32 (ConfigSize, SIZE_4KB * 8 * 32) < BusMax - BusMin + 1) { | |
| DEBUG ((EFI_D_ERROR, "%a: invalid 'bus-range' and/or 'reg'\n", | |
| __FUNCTION__)); | |
| return EFI_PROTOCOL_ERROR; | |
| } | |
| // | |
| // Iterate over "ranges". | |
| // | |
| Prop = fdt_getprop (DeviceTreeBase, Node, "ranges", &Len); | |
| if (Prop == NULL || Len == 0 || | |
| Len % sizeof (DTB_PCI_HOST_RANGE_RECORD) != 0) { | |
| DEBUG ((EFI_D_ERROR, "%a: 'ranges' not found or invalid\n", __FUNCTION__)); | |
| return EFI_PROTOCOL_ERROR; | |
| } | |
| // | |
| // IoBase, IoTranslation, MmioBase and MmioTranslation are initialized only | |
| // in order to suppress '-Werror=maybe-uninitialized' warnings *incorrectly* | |
| // emitted by some gcc versions. | |
| // | |
| IoBase = 0; | |
| IoTranslation = 0; | |
| MmioBase = 0; | |
| MmioTranslation = 0; | |
| // | |
| // IoSize and MmioSize are initialized to zero because the logic below | |
| // requires it. | |
| // | |
| IoSize = 0; | |
| MmioSize = 0; | |
| for (RecordIdx = 0; RecordIdx < Len / sizeof (DTB_PCI_HOST_RANGE_RECORD); | |
| ++RecordIdx) { | |
| CONST DTB_PCI_HOST_RANGE_RECORD *Record; | |
| Record = (CONST DTB_PCI_HOST_RANGE_RECORD *)Prop + RecordIdx; | |
| switch (fdt32_to_cpu (Record->Type) & DTB_PCI_HOST_RANGE_TYPEMASK) { | |
| case DTB_PCI_HOST_RANGE_IO: | |
| IoBase = fdt64_to_cpu (Record->ChildBase); | |
| IoSize = fdt64_to_cpu (Record->Size); | |
| IoTranslation = fdt64_to_cpu (Record->CpuBase) - IoBase; | |
| break; | |
| case DTB_PCI_HOST_RANGE_MMIO32: | |
| MmioBase = fdt64_to_cpu (Record->ChildBase); | |
| MmioSize = fdt64_to_cpu (Record->Size); | |
| MmioTranslation = fdt64_to_cpu (Record->CpuBase) - MmioBase; | |
| if (MmioBase > MAX_UINT32 || MmioSize > MAX_UINT32 || | |
| MmioBase + MmioSize > SIZE_4GB) { | |
| DEBUG ((EFI_D_ERROR, "%a: MMIO32 space invalid\n", __FUNCTION__)); | |
| return EFI_PROTOCOL_ERROR; | |
| } | |
| if (MmioTranslation != 0) { | |
| DEBUG ((EFI_D_ERROR, "%a: unsupported nonzero MMIO32 translation " | |
| "0x%Lx\n", __FUNCTION__, MmioTranslation)); | |
| return EFI_UNSUPPORTED; | |
| } | |
| break; | |
| } | |
| } | |
| if (IoSize == 0 || MmioSize == 0) { | |
| DEBUG ((EFI_D_ERROR, "%a: %a space empty\n", __FUNCTION__, | |
| (IoSize == 0) ? "IO" : "MMIO32")); | |
| return EFI_PROTOCOL_ERROR; | |
| } | |
| PcdSet64 (PcdPciExpressBaseAddress, ConfigBase); | |
| PcdSet32 (PcdPciBusMin, BusMin); | |
| PcdSet32 (PcdPciBusMax, BusMax); | |
| PcdSet64 (PcdPciIoBase, IoBase); | |
| PcdSet64 (PcdPciIoSize, IoSize); | |
| PcdSet64 (PcdPciIoTranslation, IoTranslation); | |
| PcdSet32 (PcdPciMmio32Base, (UINT32)MmioBase); | |
| PcdSet32 (PcdPciMmio32Size, (UINT32)MmioSize); | |
| PcdSetBool (PcdPciDisableBusEnumeration, FALSE); | |
| DEBUG ((EFI_D_INFO, "%a: Config[0x%Lx+0x%Lx) Bus[0x%x..0x%x] " | |
| "Io[0x%Lx+0x%Lx)@0x%Lx Mem[0x%Lx+0x%Lx)@0x%Lx\n", __FUNCTION__, ConfigBase, | |
| ConfigSize, BusMin, BusMax, IoBase, IoSize, IoTranslation, MmioBase, | |
| MmioSize, MmioTranslation)); | |
| return EFI_SUCCESS; | |
| } | |
| EFI_STATUS | |
| EFIAPI | |
| InitializeVirtFdtDxe ( | |
| IN EFI_HANDLE ImageHandle, | |
| IN EFI_SYSTEM_TABLE *SystemTable | |
| ) | |
| { | |
| VOID *Hob; | |
| VOID *DeviceTreeBase; | |
| INT32 Node, Prev; | |
| INT32 RtcNode; | |
| EFI_STATUS Status; | |
| CONST CHAR8 *Type; | |
| INT32 Len; | |
| PROPERTY_TYPE PropType; | |
| CONST VOID *RegProp; | |
| VIRTIO_TRANSPORT_DEVICE_PATH *DevicePath; | |
| EFI_HANDLE Handle; | |
| UINT64 RegBase; | |
| UINT64 DistBase, CpuBase, RedistBase; | |
| CONST INTERRUPT_PROPERTY *InterruptProp; | |
| INT32 SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum; | |
| CONST CHAR8 *PsciMethod; | |
| UINT64 FwCfgSelectorAddress; | |
| UINT64 FwCfgSelectorSize; | |
| UINT64 FwCfgDataAddress; | |
| UINT64 FwCfgDataSize; | |
| Hob = GetFirstGuidHob(&gFdtHobGuid); | |
| if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) { | |
| return EFI_NOT_FOUND; | |
| } | |
| DeviceTreeBase = (VOID *)(UINTN)*(UINT64 *)GET_GUID_HOB_DATA (Hob); | |
| if (fdt_check_header (DeviceTreeBase) != 0) { | |
| DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__, DeviceTreeBase)); | |
| return EFI_NOT_FOUND; | |
| } | |
| Status = gBS->InstallConfigurationTable (&gFdtTableGuid, DeviceTreeBase); | |
| ASSERT_EFI_ERROR (Status); | |
| DEBUG ((EFI_D_INFO, "%a: DTB @ 0x%p\n", __FUNCTION__, DeviceTreeBase)); | |
| RtcNode = -1; | |
| // | |
| // Now enumerate the nodes and install peripherals that we are interested in, | |
| // i.e., GIC, RTC and virtio MMIO nodes | |
| // | |
| for (Prev = 0;; Prev = Node) { | |
| Node = fdt_next_node (DeviceTreeBase, Prev, NULL); | |
| if (Node < 0) { | |
| break; | |
| } | |
| Type = fdt_getprop (DeviceTreeBase, Node, "compatible", &Len); | |
| if (Type == NULL) { | |
| continue; | |
| } | |
| PropType = GetTypeFromNode (Type, Len); | |
| if (PropType == PropertyTypeUnknown) { | |
| continue; | |
| } | |
| // | |
| // Get the 'reg' property of this node. For now, we will assume | |
| // 8 byte quantities for base and size, respectively. | |
| // TODO use #cells root properties instead | |
| // | |
| RegProp = fdt_getprop (DeviceTreeBase, Node, "reg", &Len); | |
| ASSERT ((RegProp != NULL) || (PropType == PropertyTypeTimer) || | |
| (PropType == PropertyTypePsci)); | |
| switch (PropType) { | |
| case PropertyTypePciHost: | |
| ASSERT (Len == 2 * sizeof (UINT64)); | |
| Status = ProcessPciHost (DeviceTreeBase, Node, RegProp); | |
| ASSERT_EFI_ERROR (Status); | |
| break; | |
| case PropertyTypeFwCfg: | |
| ASSERT (Len == 2 * sizeof (UINT64)); | |
| FwCfgDataAddress = fdt64_to_cpu (((UINT64 *)RegProp)[0]); | |
| FwCfgDataSize = 8; | |
| FwCfgSelectorAddress = FwCfgDataAddress + FwCfgDataSize; | |
| FwCfgSelectorSize = 2; | |
| // | |
| // The following ASSERT()s express | |
| // | |
| // Address + Size - 1 <= MAX_UINTN | |
| // | |
| // for both registers, that is, that the last byte in each MMIO range is | |
| // expressible as a MAX_UINTN. The form below is mathematically | |
| // equivalent, and it also prevents any unsigned overflow before the | |
| // comparison. | |
| // | |
| ASSERT (FwCfgSelectorAddress <= MAX_UINTN - FwCfgSelectorSize + 1); | |
| ASSERT (FwCfgDataAddress <= MAX_UINTN - FwCfgDataSize + 1); | |
| PcdSet64 (PcdFwCfgSelectorAddress, FwCfgSelectorAddress); | |
| PcdSet64 (PcdFwCfgDataAddress, FwCfgDataAddress); | |
| DEBUG ((EFI_D_INFO, "Found FwCfg @ 0x%Lx/0x%Lx\n", FwCfgSelectorAddress, | |
| FwCfgDataAddress)); | |
| break; | |
| case PropertyTypeVirtio: | |
| ASSERT (Len == 16); | |
| // | |
| // Create a unique device path for this transport on the fly | |
| // | |
| RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]); | |
| DevicePath = (VIRTIO_TRANSPORT_DEVICE_PATH *)CreateDeviceNode ( | |
| HARDWARE_DEVICE_PATH, | |
| HW_VENDOR_DP, | |
| sizeof (VIRTIO_TRANSPORT_DEVICE_PATH)); | |
| if (DevicePath == NULL) { | |
| DEBUG ((EFI_D_ERROR, "%a: Out of memory\n", __FUNCTION__)); | |
| break; | |
| } | |
| CopyMem (&DevicePath->Vendor.Guid, &gVirtioMmioTransportGuid, | |
| sizeof (EFI_GUID)); | |
| DevicePath->PhysBase = RegBase; | |
| SetDevicePathNodeLength (&DevicePath->Vendor, | |
| sizeof (*DevicePath) - sizeof (DevicePath->End)); | |
| SetDevicePathEndNode (&DevicePath->End); | |
| Handle = NULL; | |
| Status = gBS->InstallProtocolInterface (&Handle, | |
| &gEfiDevicePathProtocolGuid, EFI_NATIVE_INTERFACE, | |
| DevicePath); | |
| if (EFI_ERROR (Status)) { | |
| DEBUG ((EFI_D_ERROR, "%a: Failed to install the EFI_DEVICE_PATH " | |
| "protocol on a new handle (Status == %r)\n", | |
| __FUNCTION__, Status)); | |
| FreePool (DevicePath); | |
| break; | |
| } | |
| Status = VirtioMmioInstallDevice (RegBase, Handle); | |
| if (EFI_ERROR (Status)) { | |
| DEBUG ((EFI_D_ERROR, "%a: Failed to install VirtIO transport @ 0x%Lx " | |
| "on handle %p (Status == %r)\n", __FUNCTION__, RegBase, | |
| Handle, Status)); | |
| Status = gBS->UninstallProtocolInterface (Handle, | |
| &gEfiDevicePathProtocolGuid, DevicePath); | |
| ASSERT_EFI_ERROR (Status); | |
| FreePool (DevicePath); | |
| } | |
| break; | |
| case PropertyTypeGic: | |
| ASSERT (Len == 32); | |
| DistBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]); | |
| CpuBase = fdt64_to_cpu (((UINT64 *)RegProp)[2]); | |
| ASSERT (DistBase < MAX_UINT32); | |
| ASSERT (CpuBase < MAX_UINT32); | |
| PcdSet32 (PcdGicDistributorBase, (UINT32)DistBase); | |
| PcdSet32 (PcdGicInterruptInterfaceBase, (UINT32)CpuBase); | |
| PcdSet32 (PcdArmGicRevision, 2); | |
| DEBUG ((EFI_D_INFO, "Found GIC @ 0x%Lx/0x%Lx\n", DistBase, CpuBase)); | |
| break; | |
| case PropertyTypeGicV3: | |
| // | |
| // The GIC v3 DT binding describes a series of at least 3 physical (base | |
| // addresses, size) pairs: the distributor interface (GICD), at least one | |
| // redistributor region (GICR) containing dedicated redistributor | |
| // interfaces for all individual CPUs, and the CPU interface (GICC). | |
| // Under virtualization, we assume that the first redistributor region | |
| // listed covers the boot CPU. Also, our GICv3 driver only supports the | |
| // system register CPU interface, so we can safely ignore the MMIO version | |
| // which is listed after the sequence of redistributor interfaces. | |
| // This means we are only interested in the first two memory regions | |
| // supplied, and ignore everything else. | |
| // | |
| ASSERT (Len >= 32); | |
| // RegProp[0..1] == { GICD base, GICD size } | |
| DistBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]); | |
| ASSERT (DistBase < MAX_UINT32); | |
| // RegProp[2..3] == { GICR base, GICR size } | |
| RedistBase = fdt64_to_cpu (((UINT64 *)RegProp)[2]); | |
| ASSERT (RedistBase < MAX_UINT32); | |
| PcdSet32 (PcdGicDistributorBase, (UINT32)DistBase); | |
| PcdSet32 (PcdGicRedistributorsBase, (UINT32)RedistBase); | |
| PcdSet32 (PcdArmGicRevision, 3); | |
| DEBUG ((EFI_D_INFO, "Found GIC v3 (re)distributor @ 0x%Lx (0x%Lx)\n", | |
| DistBase, RedistBase)); | |
| break; | |
| case PropertyTypeRtc: | |
| ASSERT (Len == 16); | |
| RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]); | |
| ASSERT (RegBase < MAX_UINT32); | |
| PcdSet32 (PcdPL031RtcBase, (UINT32)RegBase); | |
| DEBUG ((EFI_D_INFO, "Found PL031 RTC @ 0x%Lx\n", RegBase)); | |
| RtcNode = Node; | |
| break; | |
| case PropertyTypeTimer: | |
| // | |
| // - interrupts : Interrupt list for secure, non-secure, virtual and | |
| // hypervisor timers, in that order. | |
| // | |
| InterruptProp = fdt_getprop (DeviceTreeBase, Node, "interrupts", &Len); | |
| ASSERT (Len == 36 || Len == 48); | |
| SecIntrNum = fdt32_to_cpu (InterruptProp[0].Number) | |
| + (InterruptProp[0].Type ? 16 : 0); | |
| IntrNum = fdt32_to_cpu (InterruptProp[1].Number) | |
| + (InterruptProp[1].Type ? 16 : 0); | |
| VirtIntrNum = fdt32_to_cpu (InterruptProp[2].Number) | |
| + (InterruptProp[2].Type ? 16 : 0); | |
| HypIntrNum = Len < 48 ? 0 : fdt32_to_cpu (InterruptProp[3].Number) | |
| + (InterruptProp[3].Type ? 16 : 0); | |
| DEBUG ((EFI_D_INFO, "Found Timer interrupts %d, %d, %d, %d\n", | |
| SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum)); | |
| PcdSet32 (PcdArmArchTimerSecIntrNum, SecIntrNum); | |
| PcdSet32 (PcdArmArchTimerIntrNum, IntrNum); | |
| PcdSet32 (PcdArmArchTimerVirtIntrNum, VirtIntrNum); | |
| PcdSet32 (PcdArmArchTimerHypIntrNum, HypIntrNum); | |
| break; | |
| case PropertyTypePsci: | |
| PsciMethod = fdt_getprop (DeviceTreeBase, Node, "method", &Len); | |
| if (PsciMethod && AsciiStrnCmp (PsciMethod, "hvc", 3) == 0) { | |
| PcdSet32 (PcdArmPsciMethod, 1); | |
| } else if (PsciMethod && AsciiStrnCmp (PsciMethod, "smc", 3) == 0) { | |
| PcdSet32 (PcdArmPsciMethod, 2); | |
| } else { | |
| DEBUG ((EFI_D_ERROR, "%a: Unknown PSCI method \"%a\"\n", __FUNCTION__, | |
| PsciMethod)); | |
| } | |
| break; | |
| case PropertyTypeXen: | |
| ASSERT (Len == 16); | |
| // | |
| // Retrieve the reg base from this node and wire it up to the | |
| // MMIO flavor of the XenBus root device I/O protocol | |
| // | |
| RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]); | |
| Handle = NULL; | |
| Status = XenIoMmioInstall (&Handle, RegBase); | |
| if (EFI_ERROR (Status)) { | |
| DEBUG ((EFI_D_ERROR, "%a: XenIoMmioInstall () failed on a new handle " | |
| "(Status == %r)\n", __FUNCTION__, Status)); | |
| break; | |
| } | |
| DEBUG ((EFI_D_INFO, "Found Xen node with Grant table @ 0x%Lx\n", RegBase)); | |
| break; | |
| default: | |
| break; | |
| } | |
| } | |
| // | |
| // UEFI takes ownership of the RTC hardware, and exposes its functionality | |
| // through the UEFI Runtime Services GetTime, SetTime, etc. This means we | |
| // need to disable it in the device tree to prevent the OS from attaching its | |
| // device driver as well. | |
| // | |
| if ((RtcNode != -1) && | |
| fdt_setprop_string (DeviceTreeBase, RtcNode, "status", | |
| "disabled") != 0) { | |
| DEBUG ((EFI_D_WARN, "Failed to set PL031 status to 'disabled'\n")); | |
| } | |
| return EFI_SUCCESS; | |
| } |