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Fix DMA Sram access when not word aligned

This commit is contained in:
Nekokabu 2015-08-01 17:48:38 +09:00
parent 91b643bfe1
commit 0772341b6a
1 changed files with 130 additions and 5 deletions
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127
Source/Project64/N64 System/Mips/Sram.cpp
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@ -53,6 +53,8 @@ bool CSram::LoadSram()
void CSram::DmaFromSram(BYTE * dest, int StartOffset, int len)
{
DWORD dwRead;
DWORD i;
BYTE tmp[4];
if (m_hFile == NULL)
{
@ -61,13 +63,76 @@ void CSram::DmaFromSram(BYTE * dest, int StartOffset, int len)
return;
}
}
DWORD Offset = StartOffset & 3;
if (Offset == 0)
{
SetFilePointer(m_hFile, StartOffset, NULL, FILE_BEGIN);
ReadFile(m_hFile, dest, len, &dwRead, NULL);
}
else
{
SetFilePointer(m_hFile, StartOffset - Offset, NULL, FILE_BEGIN);
ReadFile(m_hFile, tmp, 4, &dwRead, NULL);
for (i = 0; i < (4 - Offset); i++)
{
dest[i + Offset] = tmp[i];
}
for (i = 4 - Offset; i < len - Offset; i += 4)
{
ReadFile(m_hFile, tmp, 4, &dwRead, NULL);
switch (Offset)
{
case 1:
dest[i + 2] = tmp[0];
dest[i + 3] = tmp[1];
dest[i + 4] = tmp[2];
dest[i - 3] = tmp[3];
break;
case 2:
dest[i + 4] = tmp[0];
dest[i + 5] = tmp[1];
dest[i - 2] = tmp[2];
dest[i - 1] = tmp[3];
break;
case 3:
dest[i + 6] = tmp[0];
dest[i - 1] = tmp[1];
dest[i] = tmp[2];
dest[i + 1] = tmp[3];
break;
default:
break;
}
}
ReadFile(m_hFile, tmp, 4, &dwRead, NULL);
switch (Offset)
{
case 1:
dest[i - 3] = tmp[3];
break;
case 2:
dest[i - 2] = tmp[2];
dest[i - 1] = tmp[3];
break;
case 3:
dest[i - 1] = tmp[1];
dest[i] = tmp[2];
dest[i + 1] = tmp[3];
break;
default:
break;
}
}
}
void CSram::DmaToSram(BYTE * Source, int StartOffset, int len)
{
DWORD dwWritten;
DWORD i;
BYTE tmp[4];
if (m_ReadOnly)
{
return;
@ -80,8 +145,68 @@ void CSram::DmaToSram(BYTE * Source, int StartOffset, int len)
return;
}
}
DWORD dwWritten;
DWORD Offset = StartOffset & 3;
if (Offset == 0)
{
SetFilePointer(m_hFile, StartOffset, NULL, FILE_BEGIN);
WriteFile(m_hFile, Source, len, &dwWritten, NULL);
}
else
{
for (i = 0; i < (4 - Offset); i++)
{
tmp[i] = Source[i + Offset];
}
SetFilePointer(m_hFile, StartOffset - Offset, NULL, FILE_BEGIN);
WriteFile(m_hFile, tmp, (4 - Offset), &dwWritten, NULL);
SetFilePointer(m_hFile, Offset, NULL, FILE_CURRENT);
for (i = 4 - Offset; i < len - Offset; i += 4)
{
switch (Offset)
{
case 1:
tmp[0] = Source[i + 2];
tmp[1] = Source[i + 3];
tmp[2] = Source[i + 4];
tmp[3] = Source[i - 3];
break;
case 2:
tmp[0] = Source[i + 4];
tmp[1] = Source[i + 5];
tmp[2] = Source[i - 2];
tmp[3] = Source[i - 1];
break;
case 3:
tmp[0] = Source[i + 6];
tmp[1] = Source[i - 1];
tmp[2] = Source[i];
tmp[3] = Source[i + 1];
break;
default:
break;
}
WriteFile(m_hFile, tmp, 4, &dwWritten, NULL);
}
switch (Offset)
{
case 1:
tmp[0] = Source[i - 3];
break;
case 2:
tmp[0] = Source[i - 2];
tmp[0] = Source[i - 1];
break;
case 3:
tmp[0] = Source[i - 1];
tmp[0] = Source[i];
tmp[0] = Source[i + 1];
break;
default:
break;
}
SetFilePointer(m_hFile, 4 - Offset, NULL, FILE_CURRENT);
WriteFile(m_hFile, tmp, Offset, &dwWritten, NULL);
}
FlushFileBuffers(m_hFile);
}