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| author | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2013-06-22 16:16:13 +0200 |
|---|---|---|
| committer | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2014-11-08 23:18:07 +0100 |
| commit | c606f0866c3a2a5db3ef9bc41738ef33eb9612a9 (patch) | |
| tree | 5847c644cdfff3c1dd55b88b565448087ae89f11 /src/Boot/Windows/BootMemory.cpp | |
| download | VeraCrypt-c606f0866c3a2a5db3ef9bc41738ef33eb9612a9.tar.gz VeraCrypt-c606f0866c3a2a5db3ef9bc41738ef33eb9612a9.zip | |
Add original TrueCrypt 7.1a sources
Diffstat (limited to 'src/Boot/Windows/BootMemory.cpp')
| -rw-r--r-- | src/Boot/Windows/BootMemory.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/Boot/Windows/BootMemory.cpp b/src/Boot/Windows/BootMemory.cpp new file mode 100644 index 00000000..c9e11328 --- /dev/null +++ b/src/Boot/Windows/BootMemory.cpp @@ -0,0 +1,82 @@ +/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt 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);
+}
|