Initial commit

backends/platform/psp/memory.h

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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) {
+	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;
+		const byte *src = (const 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, (const uint16 *)src, bytes, format);
+		} else {	// go to more powerful copy
+			swap((uint16 *)dst, (const uint16 *)src, bytes, format);
+		}
+	}
+};
+
+#endif /* PSP_INCLUDE_SWAP */