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/*
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) 2013-2017 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 "Platform.h"
#include "BootConsoleIo.h"
uint64 operator+ (const uint64 &a, const uint64 &b)
{
int carry = 0;
uint64 r;
r.LowPart = a.LowPart + b.LowPart;
__asm
{
jnc nocarry
mov carry, 1
nocarry:
}
r.HighPart = a.HighPart + b.HighPart + carry;
return r;
}
uint64 operator+ (const uint64 &a, uint32 b)
{
uint64 b64;
b64.HighPart = 0;
b64.LowPart = b;
return a + b64;
}
uint64 &operator+= (uint64 &a, const uint64 &b)
{
return a = a + b;
}
uint64 operator- (const uint64 &a, const uint64 &b)
{
int carry = 0;
uint64 r;
r.LowPart = a.LowPart - b.LowPart;
__asm
{
jnc nocarry
mov carry, 1
nocarry:
}
r.HighPart = a.HighPart - b.HighPart - carry;
return r;
}
uint64 operator- (const uint64 &a, uint32 b)
{
uint64 b64;
b64.HighPart = 0;
b64.LowPart = b;
return a - b64;
}
uint64 &operator-= (uint64 &a, const uint64 &b)
{
return a = a - b;
}
uint64 operator>> (const uint64 &a, int shiftCount)
{
uint64 r = a;
while (shiftCount--)
{
r.LowPart >>= 1;
if ((uint8) r.HighPart & 1)
r.LowPart |= 0x80000000UL;
r.HighPart >>= 1;
}
return r;
}
uint64 operator<< (const uint64 &a, int shiftCount)
{
uint64 r = a;
while (shiftCount--)
r += r;
return r;
}
uint64 &operator++ (uint64 &a)
{
uint64 b;
b.HighPart = 0;
b.LowPart = 1;
return a += b;
}
bool operator== (const uint64 &a, const uint64 &b)
{
return a.HighPart == b.HighPart && a.LowPart == b.LowPart;
}
bool operator> (const uint64 &a, const uint64 &b)
{
return (a.HighPart > b.HighPart) || (a.HighPart == b.HighPart && a.LowPart > b.LowPart);
}
bool operator< (const uint64 &a, const uint64 &b)
{
return (a.HighPart < b.HighPart) || (a.HighPart == b.HighPart && a.LowPart < b.LowPart);
}
bool operator>= (const uint64 &a, const uint64 &b)
{
return a > b || a == b;
}
bool operator<= (const uint64 &a, const uint64 &b)
{
return a < b || a == b;
}
#ifdef TC_BOOT_DEBUG_ENABLED
bool TestInt64 ()
{
uint64 a, b, c;
a.HighPart = 0x00112233UL;
a.LowPart = 0xabcd1234UL;
b.HighPart = 0x00ffeeddUL;
b.LowPart = 0xffffFFFFUL;
a += b;
a -= b;
++a;
b = b + (uint32) 1UL;
c = (a - ((a + b) >> 32) - (uint32) 1UL);
if (c.HighPart != 0x112233UL || c.LowPart != 0xAABC0123UL)
return false;
c = c << 9;
return c.HighPart == 0x22446755UL && c.LowPart == 0x78024600UL;
}
#endif
void CopyMemory (void *source, uint16 destSegment, uint16 destOffset, uint16 blockSize)
{
__asm
{
push es
mov si, ss:source
mov es, ss:destSegment
mov di, ss:destOffset
mov cx, ss:blockSize
cld
rep movsb
pop es
}
}
void CopyMemory (uint16 sourceSegment, uint16 sourceOffset, void *destination, uint16 blockSize)
{
__asm
{
push ds
push es
mov ax, ds
mov es, ax
mov di, ss:destination
mov si, ss:sourceOffset
mov cx, ss:blockSize
mov ds, ss:sourceSegment
cld
rep movsb
pop es
pop ds
}
}
void EraseMemory (void *memory, int size)
{
memset (memory, 0, size);
}
uint32 GetLinearAddress (uint16 segment, uint16 offset)
{
return (uint32 (segment) << 4) + offset;
}
bool RegionsIntersect (const uint64 &start1, uint32 length1, const uint64 &start2, const uint64 &end2)
{
uint64 end1 = start1 + length1 - 1UL;
uint64 intersectEnd = (end1 <= end2) ? end1 : end2;
uint64 intersectStart = (start1 >= start2) ? start1 : start2;
if (intersectStart > intersectEnd)
return false;
return (intersectEnd + 1UL - intersectStart).LowPart != 0;
}
void ThrowFatalException (int line)
{
PrintChar ('#'); Print (line);
while (1);
}
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