diff options
Diffstat (limited to 'roms/edk2/OvmfPkg/XenPlatformPei/Xen.c')
| -rw-r--r-- | roms/edk2/OvmfPkg/XenPlatformPei/Xen.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/XenPlatformPei/Xen.c b/roms/edk2/OvmfPkg/XenPlatformPei/Xen.c new file mode 100644 index 000000000..c41fecdc4 --- /dev/null +++ b/roms/edk2/OvmfPkg/XenPlatformPei/Xen.c @@ -0,0 +1,388 @@ +/**@file
+ Xen Platform PEI support
+
+ Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
+ Copyright (c) 2019, Citrix Systems, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+//
+// The package level header files this module uses
+//
+#include <PiPei.h>
+
+//
+// The Library classes this module consumes
+//
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Guid/XenInfo.h>
+#include <IndustryStandard/E820.h>
+#include <Library/ResourcePublicationLib.h>
+#include <Library/MtrrLib.h>
+#include <IndustryStandard/Xen/arch-x86/hvm/start_info.h>
+#include <Library/XenHypercallLib.h>
+#include <IndustryStandard/Xen/memory.h>
+
+#include "Platform.h"
+#include "Xen.h"
+
+STATIC UINT32 mXenLeaf = 0;
+
+EFI_XEN_INFO mXenInfo;
+
+//
+// Location of the firmware info struct setup by hvmloader.
+// Only the E820 table is used by OVMF.
+//
+EFI_XEN_OVMF_INFO *mXenHvmloaderInfo;
+STATIC EFI_E820_ENTRY64 mE820Entries[128];
+STATIC UINT32 mE820EntriesCount;
+
+/**
+ Returns E820 map provided by Xen
+
+ @param Entries Pointer to E820 map
+ @param Count Number of entries
+
+ @return EFI_STATUS
+**/
+EFI_STATUS
+XenGetE820Map (
+ EFI_E820_ENTRY64 **Entries,
+ UINT32 *Count
+ )
+{
+ INTN ReturnCode;
+ xen_memory_map_t Parameters;
+ UINTN LoopIndex;
+ UINTN Index;
+ EFI_E820_ENTRY64 TmpEntry;
+
+ //
+ // Get E820 produced by hvmloader
+ //
+ if (mXenHvmloaderInfo != NULL) {
+ ASSERT (mXenHvmloaderInfo->E820 < MAX_ADDRESS);
+ *Entries = (EFI_E820_ENTRY64 *)(UINTN) mXenHvmloaderInfo->E820;
+ *Count = mXenHvmloaderInfo->E820EntriesCount;
+
+ return EFI_SUCCESS;
+ }
+
+ //
+ // Otherwise, get the E820 table from the Xen hypervisor
+ //
+
+ if (mE820EntriesCount > 0) {
+ *Entries = mE820Entries;
+ *Count = mE820EntriesCount;
+ return EFI_SUCCESS;
+ }
+
+ Parameters.nr_entries = 128;
+ set_xen_guest_handle (Parameters.buffer, mE820Entries);
+
+ // Returns a errno
+ ReturnCode = XenHypercallMemoryOp (XENMEM_memory_map, &Parameters);
+ ASSERT (ReturnCode == 0);
+
+ mE820EntriesCount = Parameters.nr_entries;
+
+ //
+ // Sort E820 entries
+ //
+ for (LoopIndex = 1; LoopIndex < mE820EntriesCount; LoopIndex++) {
+ for (Index = LoopIndex; Index < mE820EntriesCount; Index++) {
+ if (mE820Entries[Index - 1].BaseAddr > mE820Entries[Index].BaseAddr) {
+ TmpEntry = mE820Entries[Index];
+ mE820Entries[Index] = mE820Entries[Index - 1];
+ mE820Entries[Index - 1] = TmpEntry;
+ }
+ }
+ }
+
+ *Count = mE820EntriesCount;
+ *Entries = mE820Entries;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Connects to the Hypervisor.
+
+ @return EFI_STATUS
+
+**/
+EFI_STATUS
+XenConnect (
+ )
+{
+ UINT32 Index;
+ UINT32 TransferReg;
+ UINT32 TransferPages;
+ UINT32 XenVersion;
+ EFI_XEN_OVMF_INFO *Info;
+ CHAR8 Sig[sizeof (Info->Signature) + 1];
+ UINT32 *PVHResetVectorData;
+ RETURN_STATUS Status;
+
+ ASSERT (mXenLeaf != 0);
+
+ //
+ // Prepare HyperPages to be able to make hypercalls
+ //
+
+ AsmCpuid (mXenLeaf + 2, &TransferPages, &TransferReg, NULL, NULL);
+ mXenInfo.HyperPages = AllocatePages (TransferPages);
+ if (!mXenInfo.HyperPages) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ for (Index = 0; Index < TransferPages; Index++) {
+ AsmWriteMsr64 (TransferReg,
+ (UINTN) mXenInfo.HyperPages +
+ (Index << EFI_PAGE_SHIFT) + Index);
+ }
+
+ //
+ // Find out the Xen version
+ //
+
+ AsmCpuid (mXenLeaf + 1, &XenVersion, NULL, NULL, NULL);
+ DEBUG ((DEBUG_ERROR, "Detected Xen version %d.%d\n",
+ XenVersion >> 16, XenVersion & 0xFFFF));
+ mXenInfo.VersionMajor = (UINT16)(XenVersion >> 16);
+ mXenInfo.VersionMinor = (UINT16)(XenVersion & 0xFFFF);
+
+ //
+ // Check if there are information left by hvmloader
+ //
+
+ Info = (EFI_XEN_OVMF_INFO *)(UINTN) OVMF_INFO_PHYSICAL_ADDRESS;
+ //
+ // Copy the signature, and make it null-terminated.
+ //
+ AsciiStrnCpyS (Sig, sizeof (Sig), (CHAR8 *) &Info->Signature,
+ sizeof (Info->Signature));
+ if (AsciiStrCmp (Sig, "XenHVMOVMF") == 0) {
+ mXenHvmloaderInfo = Info;
+ } else {
+ mXenHvmloaderInfo = NULL;
+ }
+
+ mXenInfo.RsdpPvh = NULL;
+
+ //
+ // Locate and use information from the start of day structure if we have
+ // booted via the PVH entry point.
+ //
+
+ PVHResetVectorData = (VOID *)(UINTN) PcdGet32 (PcdXenPvhStartOfDayStructPtr);
+ //
+ // That magic value is written in XenResetVector/Ia32/XenPVHMain.asm
+ //
+ if (PVHResetVectorData[1] == SIGNATURE_32 ('X', 'P', 'V', 'H')) {
+ struct hvm_start_info *HVMStartInfo;
+
+ HVMStartInfo = (VOID *)(UINTN) PVHResetVectorData[0];
+ if (HVMStartInfo->magic == XEN_HVM_START_MAGIC_VALUE) {
+ ASSERT (HVMStartInfo->rsdp_paddr != 0);
+ if (HVMStartInfo->rsdp_paddr != 0) {
+ mXenInfo.RsdpPvh = (VOID *)(UINTN)HVMStartInfo->rsdp_paddr;
+ }
+ }
+ }
+
+ BuildGuidDataHob (
+ &gEfiXenInfoGuid,
+ &mXenInfo,
+ sizeof(mXenInfo)
+ );
+
+ //
+ // Initialize the XenHypercall library, now that the XenInfo HOB is
+ // available
+ //
+ Status = XenHypercallLibInit ();
+ ASSERT_RETURN_ERROR (Status);
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Figures out if we are running inside Xen HVM.
+
+ @retval TRUE Xen was detected
+ @retval FALSE Xen was not detected
+
+**/
+BOOLEAN
+XenDetect (
+ VOID
+ )
+{
+ UINT8 Signature[13];
+
+ if (mXenLeaf != 0) {
+ return TRUE;
+ }
+
+ Signature[12] = '\0';
+ for (mXenLeaf = 0x40000000; mXenLeaf < 0x40010000; mXenLeaf += 0x100) {
+ AsmCpuid (mXenLeaf,
+ NULL,
+ (UINT32 *) &Signature[0],
+ (UINT32 *) &Signature[4],
+ (UINT32 *) &Signature[8]);
+
+ if (!AsciiStrCmp ((CHAR8 *) Signature, "XenVMMXenVMM")) {
+ return TRUE;
+ }
+ }
+
+ mXenLeaf = 0;
+ return FALSE;
+}
+
+BOOLEAN
+XenHvmloaderDetected (
+ VOID
+ )
+{
+ return (mXenHvmloaderInfo != NULL);
+}
+
+BOOLEAN
+XenPvhDetected (
+ VOID
+ )
+{
+ //
+ // This function should only be used after XenConnect
+ //
+ ASSERT (mXenInfo.HyperPages != NULL);
+
+ return mXenHvmloaderInfo == NULL;
+}
+
+VOID
+XenPublishRamRegions (
+ VOID
+ )
+{
+ EFI_E820_ENTRY64 *E820Map;
+ UINT32 E820EntriesCount;
+ EFI_STATUS Status;
+ EFI_E820_ENTRY64 *Entry;
+ UINTN Index;
+ UINT64 LapicBase;
+ UINT64 LapicEnd;
+
+
+ DEBUG ((DEBUG_INFO, "Using memory map provided by Xen\n"));
+
+ //
+ // Parse RAM in E820 map
+ //
+ E820EntriesCount = 0;
+ Status = XenGetE820Map (&E820Map, &E820EntriesCount);
+ ASSERT_EFI_ERROR (Status);
+
+ AddMemoryBaseSizeHob (0, 0xA0000);
+ //
+ // Video memory + Legacy BIOS region, to allow Linux to boot.
+ //
+ AddReservedMemoryBaseSizeHob (0xA0000, BASE_1MB - 0xA0000, TRUE);
+
+ LapicBase = PcdGet32 (PcdCpuLocalApicBaseAddress);
+ LapicEnd = LapicBase + SIZE_1MB;
+ AddIoMemoryRangeHob (LapicBase, LapicEnd);
+
+ for (Index = 0; Index < E820EntriesCount; Index++) {
+ UINT64 Base;
+ UINT64 End;
+ UINT64 ReservedBase;
+ UINT64 ReservedEnd;
+
+ Entry = &E820Map[Index];
+
+ //
+ // Round up the start address, and round down the end address.
+ //
+ Base = ALIGN_VALUE (Entry->BaseAddr, (UINT64)EFI_PAGE_SIZE);
+ End = (Entry->BaseAddr + Entry->Length) & ~(UINT64)EFI_PAGE_MASK;
+
+ //
+ // Ignore the first 1MB, this is handled before the loop.
+ //
+ if (Base < BASE_1MB) {
+ Base = BASE_1MB;
+ }
+ if (Base >= End) {
+ continue;
+ }
+
+ switch (Entry->Type) {
+ case EfiAcpiAddressRangeMemory:
+ AddMemoryRangeHob (Base, End);
+ break;
+ case EfiAcpiAddressRangeACPI:
+ AddReservedMemoryRangeHob (Base, End, FALSE);
+ break;
+ case EfiAcpiAddressRangeReserved:
+ //
+ // hvmloader marks a range that overlaps with the local APIC memory
+ // mapped region as reserved, but CpuDxe wants it as mapped IO. We
+ // have already added it as mapped IO, so skip it here.
+ //
+
+ //
+ // add LAPIC predecessor range, if any
+ //
+ ReservedBase = Base;
+ ReservedEnd = MIN (End, LapicBase);
+ if (ReservedBase < ReservedEnd) {
+ AddReservedMemoryRangeHob (ReservedBase, ReservedEnd, FALSE);
+ }
+
+ //
+ // add LAPIC successor range, if any
+ //
+ ReservedBase = MAX (Base, LapicEnd);
+ ReservedEnd = End;
+ if (ReservedBase < ReservedEnd) {
+ AddReservedMemoryRangeHob (ReservedBase, ReservedEnd, FALSE);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+
+/**
+ Perform Xen PEI initialization.
+
+ @return EFI_SUCCESS Xen initialized successfully
+ @return EFI_NOT_FOUND Not running under Xen
+
+**/
+EFI_STATUS
+InitializeXen (
+ VOID
+ )
+{
+ RETURN_STATUS PcdStatus;
+
+ PcdStatus = PcdSetBoolS (PcdPciDisableBusEnumeration, TRUE);
+ ASSERT_RETURN_ERROR (PcdStatus);
+
+ return EFI_SUCCESS;
+}
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