mirror of https://github.com/acidanthera/audk.git
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/**@file
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Memory Detection for Virtual Machines.
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Copyright (c) 2006 - 2009, Intel Corporation
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All rights reserved. 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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Module Name:
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MemDetect.c
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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/IoLib.h>
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#include <Library/PeimEntryPoint.h>
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#include <Library/ResourcePublicationLib.h>
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#include "Platform.h"
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#include "Cmos.h"
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STATIC
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UINTN
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GetSystemMemorySize (
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)
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{
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UINT8 Cmos0x34;
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UINT8 Cmos0x35;
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//
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// CMOS 0x34/0x35 specifies the system memory above 16 MB.
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// * CMOS(0x35) is the high byte
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// * CMOS(0x34) is the low byte
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// * The size is specified in 64kb chunks
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// * Since this is memory above 16MB, the 16MB must be added
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// into the calculation to get the total memory size.
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//
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Cmos0x34 = (UINT8) CmosRead8 (0x34);
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Cmos0x35 = (UINT8) CmosRead8 (0x35);
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return ((((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);
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}
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/**
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Peform Memory Detection
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@return EFI_SUCCESS The PEIM initialized successfully.
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**/
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EFI_STATUS
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MemDetect (
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)
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{
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EFI_STATUS Status;
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EFI_PHYSICAL_ADDRESS MemoryBase;
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UINT64 MemorySize;
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UINT64 TotalMemorySize;
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DEBUG ((EFI_D_ERROR, "MemDetect called\n"));
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//
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// Determine total memory size available
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//
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TotalMemorySize = (UINT64)GetSystemMemorySize ();
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MemoryBase = 0x800000;
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MemorySize = TotalMemorySize - MemoryBase - 0x100000;
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//
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// Publish this memory to the PEI Core
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//
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Status = PublishSystemMemory(MemoryBase, MemorySize);
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ASSERT_EFI_ERROR (Status);
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//
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// Create memory HOBs
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//
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AddMemoryBaseSizeHob (MemoryBase, MemorySize);
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AddMemoryRangeHob (0x100000, 0x800000);
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AddMemoryRangeHob (0x000000, 0x0A0000);
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return EFI_SUCCESS;
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}
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