2016-05-10 20:20:14 +02:00
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/*
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Derived from source code of TrueCrypt 7.1a, which is
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Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
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by the TrueCrypt License 3.0.
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2016-05-10 22:16:32 +02:00
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Modifications and additions to the original source code (contained in this file)
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2016-05-10 20:20:14 +02:00
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and all other portions of this file are Copyright (c) 2013-2016 IDRIX
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and are governed by the Apache License 2.0 the full text of which is
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contained in the file License.txt included in VeraCrypt binary and source
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code distribution packages.
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*/
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#include "BootDefs.h"
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#include "BootMemory.h"
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static uint32 MemoryMapContValue;
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static bool GetMemoryMapEntry (BiosMemoryMapEntry &entry)
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{
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static const uint32 function = 0x0000E820UL;
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static const uint32 magic = 0x534D4150UL;
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static const uint32 bufferSize = sizeof (BiosMemoryMapEntry);
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bool carry = false;
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uint32 resultMagic;
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uint32 resultSize;
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__asm
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{
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push es
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lea di, function
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TC_ASM_MOV_EAX_DI
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lea di, MemoryMapContValue
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TC_ASM_MOV_EBX_DI
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lea di, bufferSize
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TC_ASM_MOV_ECX_DI
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lea di, magic
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TC_ASM_MOV_EDX_DI
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lea di, MemoryMapContValue
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TC_ASM_MOV_DI_ECX
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// Use alternative segment to prevent memory corruption caused by buggy BIOSes
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push TC_BOOT_LOADER_ALT_SEGMENT
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pop es
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mov di, 0
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2016-05-10 22:16:32 +02:00
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2016-05-10 20:20:14 +02:00
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int 0x15
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jnc no_carry
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mov carry, true
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no_carry:
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lea di, resultMagic
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TC_ASM_MOV_DI_EAX
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lea di, MemoryMapContValue
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TC_ASM_MOV_DI_EBX
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lea di, resultSize
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TC_ASM_MOV_DI_ECX
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pop es
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}
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CopyMemory (TC_BOOT_LOADER_ALT_SEGMENT, 0, &entry, sizeof (entry));
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// BIOS may set CF at the end of the list
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if (carry)
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MemoryMapContValue = 0;
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return resultMagic == magic && resultSize == bufferSize;
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}
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bool GetFirstBiosMemoryMapEntry (BiosMemoryMapEntry &entry)
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{
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MemoryMapContValue = 0;
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return GetMemoryMapEntry (entry);
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}
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bool GetNextBiosMemoryMapEntry (BiosMemoryMapEntry &entry)
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{
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if (MemoryMapContValue == 0)
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return false;
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return GetMemoryMapEntry (entry);
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}
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