mirror of https://github.com/acidanthera/audk.git
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/**@file
|
|
Memory Detection for Virtual Machines.
|
|
|
|
Copyright (c) 2006 - 2009, Intel Corporation. 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.
|
|
|
|
Module Name:
|
|
|
|
MemDetect.c
|
|
|
|
**/
|
|
|
|
//
|
|
// 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/IoLib.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <Library/PeimEntryPoint.h>
|
|
#include <Library/ResourcePublicationLib.h>
|
|
|
|
#include "Platform.h"
|
|
#include "Cmos.h"
|
|
|
|
STATIC
|
|
UINTN
|
|
GetSystemMemorySizeBelow4gb (
|
|
)
|
|
{
|
|
UINT8 Cmos0x34;
|
|
UINT8 Cmos0x35;
|
|
|
|
//
|
|
// CMOS 0x34/0x35 specifies the system memory above 16 MB.
|
|
// * CMOS(0x35) is the high byte
|
|
// * CMOS(0x34) is the low byte
|
|
// * The size is specified in 64kb chunks
|
|
// * Since this is memory above 16MB, the 16MB must be added
|
|
// into the calculation to get the total memory size.
|
|
//
|
|
|
|
Cmos0x34 = (UINT8) CmosRead8 (0x34);
|
|
Cmos0x35 = (UINT8) CmosRead8 (0x35);
|
|
|
|
return (((UINTN)((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);
|
|
}
|
|
|
|
|
|
STATIC
|
|
UINT64
|
|
GetSystemMemorySizeAbove4gb (
|
|
)
|
|
{
|
|
UINT32 Size;
|
|
UINTN CmosIndex;
|
|
|
|
//
|
|
// CMOS 0x5b-0x5d specifies the system memory above 4GB MB.
|
|
// * CMOS(0x5d) is the most significant size byte
|
|
// * CMOS(0x5c) is the middle size byte
|
|
// * CMOS(0x5b) is the least significant size byte
|
|
// * The size is specified in 64kb chunks
|
|
//
|
|
|
|
Size = 0;
|
|
for (CmosIndex = 0x5d; CmosIndex >= 0x5b; CmosIndex--) {
|
|
Size = (UINT32) (Size << 8) + (UINT32) CmosRead8 (CmosIndex);
|
|
}
|
|
|
|
return LShiftU64 (Size, 16);
|
|
}
|
|
|
|
|
|
/**
|
|
Peform Memory Detection
|
|
|
|
@return EFI_SUCCESS The PEIM initialized successfully.
|
|
|
|
**/
|
|
EFI_PHYSICAL_ADDRESS
|
|
MemDetect (
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
EFI_PHYSICAL_ADDRESS MemoryBase;
|
|
UINT64 MemorySize;
|
|
UINT64 LowerMemorySize;
|
|
UINT64 UpperMemorySize;
|
|
|
|
DEBUG ((EFI_D_ERROR, "MemDetect called\n"));
|
|
|
|
//
|
|
// Determine total memory size available
|
|
//
|
|
LowerMemorySize = GetSystemMemorySizeBelow4gb ();
|
|
UpperMemorySize = GetSystemMemorySizeAbove4gb ();
|
|
|
|
//
|
|
// Determine the range of memory to use during PEI
|
|
//
|
|
MemoryBase = PcdGet32 (PcdOvmfMemFvBase) + PcdGet32 (PcdOvmfMemFvSize);
|
|
MemorySize = LowerMemorySize - MemoryBase;
|
|
if (MemorySize > SIZE_64MB) {
|
|
MemoryBase = LowerMemorySize - SIZE_64MB;
|
|
MemorySize = SIZE_64MB;
|
|
}
|
|
|
|
//
|
|
// Publish this memory to the PEI Core
|
|
//
|
|
Status = PublishSystemMemory(MemoryBase, MemorySize);
|
|
ASSERT_EFI_ERROR (Status);
|
|
|
|
//
|
|
// Create memory HOBs
|
|
//
|
|
AddMemoryBaseSizeHob (MemoryBase, MemorySize);
|
|
AddMemoryRangeHob (BASE_1MB, MemoryBase);
|
|
AddMemoryRangeHob (0, BASE_512KB + BASE_128KB);
|
|
|
|
if (UpperMemorySize != 0) {
|
|
AddUntestedMemoryBaseSizeHob (BASE_4GB, UpperMemorySize);
|
|
}
|
|
|
|
return MemoryBase + MemorySize;
|
|
}
|
|
|