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/**@file
Xen Platform PEI support
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>
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 "Platform.h"
#include "Xen.h"
BOOLEAN mXen = FALSE;
STATIC UINT32 mXenLeaf = 0;
EFI_XEN_INFO mXenInfo;
/**
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
)
{
EFI_XEN_OVMF_INFO *Info =
(EFI_XEN_OVMF_INFO *)(UINTN) OVMF_INFO_PHYSICAL_ADDRESS;
if (AsciiStrCmp ((CHAR8 *) Info->Signature, "XenHVMOVMF")) {
return EFI_NOT_FOUND;
}
ASSERT (Info->E820 < MAX_ADDRESS);
*Entries = (EFI_E820_ENTRY64 *)(UINTN) Info->E820;
*Count = Info->E820EntriesCount;
return EFI_SUCCESS;
}
/**
Connects to the Hypervisor.
@param XenLeaf CPUID index used to connect.
@return EFI_STATUS
**/
EFI_STATUS
XenConnect (
UINT32 XenLeaf
)
{
UINT32 Index;
UINT32 TransferReg;
UINT32 TransferPages;
UINT32 XenVersion;
AsmCpuid (XenLeaf + 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);
}
AsmCpuid (XenLeaf + 1, &XenVersion, NULL, NULL, NULL);
DEBUG ((EFI_D_ERROR, "Detected Xen version %d.%d\n",
XenVersion >> 16, XenVersion & 0xFFFF));
mXenInfo.VersionMajor = (UINT16)(XenVersion >> 16);
mXenInfo.VersionMinor = (UINT16)(XenVersion & 0xFFFF);
BuildGuidDataHob (
&gEfiXenInfoGuid,
&mXenInfo,
sizeof(mXenInfo)
);
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")) {
mXen = TRUE;
return TRUE;
}
}
mXenLeaf = 0;
return FALSE;
}
VOID
XenPublishRamRegions (
VOID
)
{
EFI_E820_ENTRY64 *E820Map;
UINT32 E820EntriesCount;
EFI_STATUS Status;
if (!mXen) {
return;
}
DEBUG ((EFI_D_INFO, "Using memory map provided by Xen\n"));
//
// Parse RAM in E820 map
//
E820EntriesCount = 0;
Status = XenGetE820Map (&E820Map, &E820EntriesCount);
ASSERT_EFI_ERROR (Status);
if (E820EntriesCount > 0) {
EFI_E820_ENTRY64 *Entry;
UINT32 Loop;
for (Loop = 0; Loop < E820EntriesCount; Loop++) {
Entry = E820Map + Loop;
//
// Only care about RAM
//
if (Entry->Type != EfiAcpiAddressRangeMemory) {
continue;
}
AddMemoryBaseSizeHob (Entry->BaseAddr, Entry->Length);
MtrrSetMemoryAttribute (Entry->BaseAddr, Entry->Length, CacheWriteBack);
}
}
}
/**
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;
if (mXenLeaf == 0) {
return EFI_NOT_FOUND;
}
XenConnect (mXenLeaf);
//
// Reserve away HVMLOADER reserved memory [0xFC000000,0xFD000000).
// This needs to match HVMLOADER RESERVED_MEMBASE/RESERVED_MEMSIZE.
//
AddReservedMemoryBaseSizeHob (0xFC000000, 0x1000000, FALSE);
PcdStatus = PcdSetBoolS (PcdPciDisableBusEnumeration, TRUE);
ASSERT_RETURN_ERROR (PcdStatus);
return EFI_SUCCESS;
}
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