diff options
Diffstat (limited to 'src/Boot/Windows/BootMemory.cpp')
| -rw-r--r-- | src/Boot/Windows/BootMemory.cpp | 172 |
1 files changed, 86 insertions, 86 deletions
diff --git a/src/Boot/Windows/BootMemory.cpp b/src/Boot/Windows/BootMemory.cpp index c1dd3833..5729142f 100644 --- a/src/Boot/Windows/BootMemory.cpp +++ b/src/Boot/Windows/BootMemory.cpp @@ -1,86 +1,86 @@ -/*
- Derived from source code of TrueCrypt 7.1a, which is
- Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
- by the TrueCrypt License 3.0.
-
- Modifications and additions to the original source code (contained in this file)
- and all other portions of this file are Copyright (c) 2013-2016 IDRIX
- and are governed by the Apache License 2.0 the full text of which is
- contained in the file License.txt included in VeraCrypt binary and source
- code distribution packages.
-*/
-
-#include "BootDefs.h"
-#include "BootMemory.h"
-
-static uint32 MemoryMapContValue;
-
-static bool GetMemoryMapEntry (BiosMemoryMapEntry &entry)
-{
- static const uint32 function = 0x0000E820UL;
- static const uint32 magic = 0x534D4150UL;
- static const uint32 bufferSize = sizeof (BiosMemoryMapEntry);
-
- bool carry = false;
- uint32 resultMagic;
- uint32 resultSize;
-
- __asm
- {
- push es
-
- lea di, function
- TC_ASM_MOV_EAX_DI
- lea di, MemoryMapContValue
- TC_ASM_MOV_EBX_DI
- lea di, bufferSize
- TC_ASM_MOV_ECX_DI
- lea di, magic
- TC_ASM_MOV_EDX_DI
- lea di, MemoryMapContValue
- TC_ASM_MOV_DI_ECX
-
- // Use alternative segment to prevent memory corruption caused by buggy BIOSes
- push TC_BOOT_LOADER_ALT_SEGMENT
- pop es
- mov di, 0
-
- int 0x15
- jnc no_carry
- mov carry, true
- no_carry:
-
- lea di, resultMagic
- TC_ASM_MOV_DI_EAX
- lea di, MemoryMapContValue
- TC_ASM_MOV_DI_EBX
- lea di, resultSize
- TC_ASM_MOV_DI_ECX
-
- pop es
- }
-
- CopyMemory (TC_BOOT_LOADER_ALT_SEGMENT, 0, &entry, sizeof (entry));
-
- // BIOS may set CF at the end of the list
- if (carry)
- MemoryMapContValue = 0;
-
- return resultMagic == magic && resultSize == bufferSize;
-}
-
-
-bool GetFirstBiosMemoryMapEntry (BiosMemoryMapEntry &entry)
-{
- MemoryMapContValue = 0;
- return GetMemoryMapEntry (entry);
-}
-
-
-bool GetNextBiosMemoryMapEntry (BiosMemoryMapEntry &entry)
-{
- if (MemoryMapContValue == 0)
- return false;
-
- return GetMemoryMapEntry (entry);
-}
+/* + Derived from source code of TrueCrypt 7.1a, which is + Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed + by the TrueCrypt License 3.0. + + Modifications and additions to the original source code (contained in this file) + and all other portions of this file are Copyright (c) 2013-2016 IDRIX + and are governed by the Apache License 2.0 the full text of which is + contained in the file License.txt included in VeraCrypt binary and source + code distribution packages. +*/ + +#include "BootDefs.h" +#include "BootMemory.h" + +static uint32 MemoryMapContValue; + +static bool GetMemoryMapEntry (BiosMemoryMapEntry &entry) +{ + static const uint32 function = 0x0000E820UL; + static const uint32 magic = 0x534D4150UL; + static const uint32 bufferSize = sizeof (BiosMemoryMapEntry); + + bool carry = false; + uint32 resultMagic; + uint32 resultSize; + + __asm + { + push es + + lea di, function + TC_ASM_MOV_EAX_DI + lea di, MemoryMapContValue + TC_ASM_MOV_EBX_DI + lea di, bufferSize + TC_ASM_MOV_ECX_DI + lea di, magic + TC_ASM_MOV_EDX_DI + lea di, MemoryMapContValue + TC_ASM_MOV_DI_ECX + + // Use alternative segment to prevent memory corruption caused by buggy BIOSes + push TC_BOOT_LOADER_ALT_SEGMENT + pop es + mov di, 0 + + int 0x15 + jnc no_carry + mov carry, true + no_carry: + + lea di, resultMagic + TC_ASM_MOV_DI_EAX + lea di, MemoryMapContValue + TC_ASM_MOV_DI_EBX + lea di, resultSize + TC_ASM_MOV_DI_ECX + + pop es + } + + CopyMemory (TC_BOOT_LOADER_ALT_SEGMENT, 0, &entry, sizeof (entry)); + + // BIOS may set CF at the end of the list + if (carry) + MemoryMapContValue = 0; + + return resultMagic == magic && resultSize == bufferSize; +} + + +bool GetFirstBiosMemoryMapEntry (BiosMemoryMapEntry &entry) +{ + MemoryMapContValue = 0; + return GetMemoryMapEntry (entry); +} + + +bool GetNextBiosMemoryMapEntry (BiosMemoryMapEntry &entry) +{ + if (MemoryMapContValue == 0) + return false; + + return GetMemoryMapEntry (entry); +} |