mirror of https://github.com/acidanthera/audk.git
163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/**@file
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Xen Platform PEI support
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Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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//
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// The package level header files this module uses
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//
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#include <PiPei.h>
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//
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// The Library classes this module consumes
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//
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Guid/XenInfo.h>
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#include "Platform.h"
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#include "Xen.h"
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EFI_XEN_INFO mXenInfo;
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/**
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Returns E820 map provided by Xen
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@param Entries Pointer to E820 map
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@param Count Number of entries
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@return EFI_STATUS
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**/
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EFI_STATUS
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XenGetE820Map (
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EFI_E820_ENTRY64 **Entries,
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UINT32 *Count
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)
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{
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EFI_XEN_OVMF_INFO *Info =
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(EFI_XEN_OVMF_INFO *)(UINTN) OVMF_INFO_PHYSICAL_ADDRESS;
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if (AsciiStrCmp ((CHAR8 *) Info->Signature, "XenHVMOVMF")) {
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return EFI_NOT_FOUND;
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}
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ASSERT (Info->E820 < MAX_ADDRESS);
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*Entries = (EFI_E820_ENTRY64 *)(UINTN) Info->E820;
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*Count = Info->E820EntriesCount;
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return EFI_SUCCESS;
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}
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/**
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Connects to the Hypervisor.
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@param XenLeaf CPUID index used to connect.
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@return EFI_STATUS
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**/
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EFI_STATUS
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XenConnect (
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UINT32 XenLeaf
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)
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{
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UINT32 Index;
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UINT32 TransferReg;
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UINT32 TransferPages;
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UINT32 XenVersion;
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AsmCpuid (XenLeaf + 2, &TransferPages, &TransferReg, NULL, NULL);
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mXenInfo.HyperPages = AllocatePages (TransferPages);
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if (!mXenInfo.HyperPages) {
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return EFI_OUT_OF_RESOURCES;
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}
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for (Index = 0; Index < TransferPages; Index++) {
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AsmWriteMsr64 (TransferReg,
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(UINTN) mXenInfo.HyperPages +
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(Index << EFI_PAGE_SHIFT) + Index);
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}
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AsmCpuid (XenLeaf + 1, &XenVersion, NULL, NULL, NULL);
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DEBUG ((EFI_D_ERROR, "Detected Xen version %d.%d\n",
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XenVersion >> 16, XenVersion & 0xFFFF));
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mXenInfo.VersionMajor = (UINT16)(XenVersion >> 16);
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mXenInfo.VersionMinor = (UINT16)(XenVersion & 0xFFFF);
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/* TBD: Locate hvm_info and reserve it away. */
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mXenInfo.HvmInfo = NULL;
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BuildGuidDataHob (
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&gEfiXenInfoGuid,
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&mXenInfo,
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sizeof(mXenInfo)
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);
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return EFI_SUCCESS;
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}
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/**
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Figures out if we are running inside Xen HVM.
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@return UINT32 CPUID index used to connect to HV.
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**/
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UINT32
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XenDetect (
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VOID
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)
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{
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UINT32 XenLeaf;
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UINT8 Signature[13];
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for (XenLeaf = 0x40000000; XenLeaf < 0x40010000; XenLeaf += 0x100) {
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AsmCpuid (XenLeaf, NULL, (UINT32 *) &Signature[0],
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(UINT32 *) &Signature[4],
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(UINT32 *) &Signature[8]);
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Signature[12] = '\0';
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if (!AsciiStrCmp ((CHAR8 *) Signature, "XenVMMXenVMM")) {
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return XenLeaf;
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}
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}
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return 0;
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}
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/**
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Perform Xen PEI initialization.
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@return EFI_SUCCESS Xen initialized successfully
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@return EFI_NOT_FOUND Not running under Xen
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**/
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EFI_STATUS
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InitializeXen (
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UINT32 XenLeaf
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)
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{
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XenConnect (XenLeaf);
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//
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// Reserve away HVMLOADER reserved memory [0xFC000000,0xFD000000).
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// This needs to match HVMLOADER RESERVED_MEMBASE/RESERVED_MEMSIZE.
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//
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AddReservedMemoryBaseSizeHob (0xFC000000, 0x1000000);
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return EFI_SUCCESS;
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}
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