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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* 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.
*
* $URL$
* $Id$
*
*/
#ifndef PSP_MEMORY_H
#define PSP_MEMORY_H
#define MIN_AMOUNT_FOR_COMPLEX_COPY 8
#define MIN_AMOUNT_FOR_MISALIGNED_COPY 8
//#define __PSP_DEBUG_PRINT__
//#include "backends/platform/psp/trace.h"
// These instructions don't generate automatically but are faster then copying byte by byte
inline void lwl_copy(byte *dst, const byte *src) {
register uint32 data;
asm volatile ("lwr %0,0(%1)\n\t"
"lwl %0,3(%1)\n\t"
: "=&r" (data) : "r" (src), "m" (*src));
asm volatile ("swr %1,0(%2)\n\t"
"swl %1,3(%2)\n\t"
: "=m" (*dst) : "r" (data), "r" (dst));
}
/**
* Class that does memory copying and swapping if needed
*/
class PspMemory {
private:
static void testCopy(const byte *debugDst, const byte *debugSrc, uint32 debugBytes);
static void copy(byte *dst, const byte *src, uint32 bytes);
static void copy32Aligned(uint32 *dst32, const uint32 *src32, uint32 bytes);
static void copy32Misaligned(uint32 *dst32, const byte *src, uint32 bytes, uint32 alignSrc);
static inline void copy8(byte *dst, const byte *src, int32 bytes) {
//PSP_DEBUG_PRINT("copy8 called with dst[%p], src[%p], bytes[%d]\n", dst, src, bytes);
uint32 words = bytes >> 2;
for (; words; words--) {
lwl_copy(dst, src);
dst += 4;
src += 4;
}
uint32 bytesLeft = bytes & 0x3;
for (; bytesLeft; bytesLeft--) {
*dst++ = *src++;
}
}
public:
// This is the interface to the outside world
static void *fastCopy(void *dstv, const void *srcv, int32 bytes) {
byte *dst = (byte *)dstv;
byte *src = (byte *)srcv;
if (bytes < MIN_AMOUNT_FOR_COMPLEX_COPY) {
copy8(dst, src, bytes);
} else { // go to more powerful copy
copy(dst, src, bytes);
}
return dstv;
}
};
inline void *psp_memcpy(void *dst, const void *src, int32 bytes) {
return PspMemory::fastCopy(dst, src, bytes);
}
#endif /* PSP_MEMORY_H */
#if defined(PSP_INCLUDE_SWAP) && !defined(PSP_MEMORY_SWAP_H)
#define PSP_MEMORY_SWAP_H
//#include "backends/platform/psp/psppixelformat.h"
class PspMemorySwap {
private:
static void testSwap(const uint16 *debugDst, const uint16 *debugSrc, uint32 debugBytes, PSPPixelFormat &format);
static void swap(uint16 *dst16, const uint16 *src16, uint32 bytes, PSPPixelFormat &format);
static void swap32Aligned(uint32 *dst32, const uint32 *src32, uint32 bytes, PSPPixelFormat &format);
static void swap32Misaligned(uint32 *dst32, const uint16 *src16, uint32 bytes, PSPPixelFormat &format);
// For swapping, we know that we have multiples of 16 bits
static void swap16(uint16 *dst16, const uint16 *src16, uint32 bytes, PSPPixelFormat &format) {
PSP_DEBUG_PRINT("swap16 called with dst16[%p], src16[%p], bytes[%d]\n", dst16, src16, bytes);
uint32 shorts = bytes >> 1;
while (shorts--) {
*dst16++ = format.swapRedBlue16(*src16++);
}
}
public:
static void fastSwap(byte *dst, const byte *src, uint32 bytes, PSPPixelFormat &format) {
if (bytes < MIN_AMOUNT_FOR_COMPLEX_COPY * 2) {
swap16((uint16 *)dst, (uint16 *)src, bytes, format);
} else { // go to more powerful copy
swap((uint16 *)dst, (uint16 *)src, bytes, format);
}
}
};
#endif /* PSP_INCLUDE_SWAP */
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