OvmfPkg/AcpiPlatformDxe/CloudHvAcpi.c

   1 /** @file
   2   OVMF ACPI Cloud Hypervisor support
   3
   4   Copyright (c) 2021, Intel Corporation. All rights reserved.
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <IndustryStandard/CloudHv.h>                     // CLOUDHV_RSDP_ADDRESS
  11 #include <IndustryStandard/Xen/arch-x86/hvm/start_info.h> // hvm_start_info
  12 #include <Library/BaseLib.h>                              // CpuDeadLoop()
  13 #include <Library/DebugLib.h>                             // DEBUG()
  14 #include <Library/PcdLib.h>                               // PcdGet32()
  15
  16 #include "AcpiPlatform.h"
  17
  18 // Get the ACPI tables from EBDA start
  19 EFI_STATUS
  20 EFIAPI
  21 InstallCloudHvTables (
  22   IN   EFI_ACPI_TABLE_PROTOCOL  *AcpiProtocol
  23   )
  24 {
  25   EFI_STATUS  Status;
  26   UINTN       TableHandle;
  27
  28   EFI_ACPI_DESCRIPTION_HEADER                   *Xsdt;
  29   VOID                                          *CurrentTableEntry;
  30   UINTN                                         CurrentTablePointer;
  31   EFI_ACPI_DESCRIPTION_HEADER                   *CurrentTable;
  32   UINTN                                         Index;
  33   UINTN                                         NumberOfTableEntries;
  34   EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE     *Fadt2Table;
  35   EFI_ACPI_DESCRIPTION_HEADER                   *DsdtTable;
  36   EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER  *AcpiRsdpStructurePtr;
  37   UINT32                                        *PVHResetVectorData;
  38   struct hvm_start_info                         *pvh_start_info;
  39
  40   Fadt2Table           = NULL;
  41   DsdtTable            = NULL;
  42   TableHandle          = 0;
  43   NumberOfTableEntries = 0;
  44   AcpiRsdpStructurePtr = NULL;
  45   PVHResetVectorData   = NULL;
  46   pvh_start_info       = NULL;
  47
  48   PVHResetVectorData = (VOID *)(UINTN)PcdGet32 (PcdXenPvhStartOfDayStructPtr);
  49   if (PVHResetVectorData == 0) {
  50     return EFI_NOT_FOUND;
  51   }
  52
  53   pvh_start_info       = (struct hvm_start_info *)(UINTN)PVHResetVectorData[0];
  54   AcpiRsdpStructurePtr = (EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *)(UINTN)pvh_start_info->rsdp_paddr;
  55
  56   // If XSDT table is found, just install its tables.
  57   // Otherwise, try to find and install the RSDT tables.
  58   //
  59   if (AcpiRsdpStructurePtr->XsdtAddress) {
  60     //
  61     // Retrieve the addresses of XSDT and
  62     // calculate the number of its table entries.
  63     //
  64     Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)
  65            AcpiRsdpStructurePtr->XsdtAddress;
  66     NumberOfTableEntries = (Xsdt->Length -
  67                             sizeof (EFI_ACPI_DESCRIPTION_HEADER)) /
  68                            sizeof (UINT64);
  69
  70     //
  71     // Install ACPI tables found in XSDT.
  72     //
  73     for (Index = 0; Index < NumberOfTableEntries; Index++) {
  74       //
  75       // Get the table entry from XSDT
  76       //
  77       CurrentTableEntry = (VOID *)((UINT8 *)Xsdt +
  78                                    sizeof (EFI_ACPI_DESCRIPTION_HEADER) +
  79                                    Index * sizeof (UINT64));
  80       CurrentTablePointer = (UINTN)*(UINT64 *)CurrentTableEntry;
  81       CurrentTable        = (EFI_ACPI_DESCRIPTION_HEADER *)CurrentTablePointer;
  82
  83       //
  84       // Install the XSDT tables
  85       //
  86       Status = AcpiProtocol->InstallAcpiTable (
  87                                AcpiProtocol,
  88                                CurrentTable,
  89                                CurrentTable->Length,
  90                                &TableHandle
  91                                );
  92
  93       if (EFI_ERROR (Status)) {
  94         ASSERT_EFI_ERROR (Status);
  95         return Status;
  96       }
  97
  98       //
  99       // Get the X-DSDT table address from the table FADT
 100       //
 101       if (!AsciiStrnCmp ((CHAR8 *)&CurrentTable->Signature, "FACP", 4)) {
 102         Fadt2Table = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *)
 103                      (UINTN)CurrentTablePointer;
 104         DsdtTable = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Fadt2Table->XDsdt;
 105       }
 106     }
 107   } else {
 108     return EFI_NOT_FOUND;
 109   }
 110
 111   //
 112   // Install DSDT table. If we reached this point without finding the DSDT,
 113   // then we're out of sync with the hypervisor, and cannot continue.
 114   //
 115   if (DsdtTable == NULL) {
 116     DEBUG ((DEBUG_ERROR, "%a: no DSDT found\n", __FUNCTION__));
 117     ASSERT (FALSE);
 118     CpuDeadLoop ();
 119   }
 120
 121   Status = AcpiProtocol->InstallAcpiTable (
 122                            AcpiProtocol,
 123                            DsdtTable,
 124                            DsdtTable->Length,
 125                            &TableHandle
 126                            );
 127   if (EFI_ERROR (Status)) {
 128     ASSERT_EFI_ERROR (Status);
 129     return Status;
 130   }
 131
 132   return EFI_SUCCESS;
 133 }