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/* Per-platform code - ReGBA on GCW Zero
*
* Copyright (C) 2013 Dingoonity user Nebuleon
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licens e as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "common.h"
#include <sys/mman.h>
#if defined USE_MMAP
static FILE_TAG_TYPE MappedFile = FILE_TAG_INVALID;
static size_t MappedFileSize;
#endif
uint8_t* ReGBA_MapEntireROM(FILE_TAG_TYPE File, size_t Size)
{
#if defined USE_MMAP
uint8_t* Result = mmap(NULL /* kernel chooses address */,
Size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE,
fileno(File),
0 /* offset into file */);
if (Result != NULL)
{
MappedFile = File;
# if TRACE_MEMORY
ReGBA_Trace("I: Mapped a ROM to memory via the operating system");
# endif
}
return Result;
#elif defined LOAD_ALL_ROM
// The file is kept open for us. But we close it.
uint8_t* Result = malloc(Size);
if (Result != NULL)
{
ReGBA_ProgressInitialise(FILE_ACTION_LOAD_ROM_FROM_FILE);
uint8_t* Ptr = Result;
size_t Read, Next, Done = 0;
Next = Size - Done < 65536 ? Size - Done : 65536;
while ((Read = FILE_READ(File, Ptr, Next)) > 0)
{
Ptr += Read;
Done += Read;
ReGBA_ProgressUpdate(Done, Size);
Next = Size - Done < 65536 ? Size - Done : 65536;
}
ReGBA_ProgressFinalise();
# if TRACE_MEMORY
ReGBA_Trace("I: Loaded an entire ROM from file");
# endif
}
FILE_CLOSE(File);
return Result;
#else
return NULL;
#endif
}
void ReGBA_UnmapEntireROM(void* Mapping)
{
#if defined USE_MMAP
munmap(Mapping, MappedFileSize);
FILE_CLOSE(MappedFile);
# if TRACE_MEMORY
ReGBA_Trace("I: Unmapped the previous ROM from memory");
# endif
MappedFile = NULL;
MappedFileSize = 0;
#elif defined LOAD_ALL_ROM
free(Mapping);
# if TRACE_MEMORY
ReGBA_Trace("I: Unloaded the previous ROM from memory");
# endif
#endif
}
uint8_t* ReGBA_AllocateROM(size_t Size)
{
uint8_t* Result = malloc(Size);
#if TRACE_MEMORY
if (Result != NULL)
ReGBA_Trace("I: Allocated space for a %u-byte ROM buffer", Size);
#endif
return Result;
}
size_t ReGBA_AllocateOnDemandBuffer(void** Buffer)
{
/* At the end of this function, the ROM buffer will have been sized so
* that at least 2 MiB are left for other operations.
*/
void* Result = NULL;
/* Start with trying to get 34 MiB. Let go in 1 MiB increments. */
size_t Size = 34 * 1024 * 1024;
Result = malloc(Size);
while (Result == NULL)
{
Size -= 1024 * 1024;
Result = malloc(Size);
}
/* Now free the allocation and allocate it again, minus 2 MiB.
* The allocation of 34 MiB above is so that the full 32 MiB of the
* largest allowable GBA ROM size can be allocated on supported
* platforms. */
free(Result);
Size -= 2 * 1024 * 1024;
Result = malloc(Size);
#if TRACE_MEMORY
ReGBA_Trace("I: Allocated space for a %u-byte on-demand buffer",
Size);
#endif
*Buffer = Result;
return Size;
}
void ReGBA_DeallocateROM(void* Buffer)
{
free(Buffer);
#if TRACE_MEMORY
ReGBA_Trace("I: Deallocated space for the previous buffer");
#endif
}
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