mirror of
https://github.com/libretro/RetroArch
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107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/** This code is licensed to you under the terms of the GNU GPL, version 2;
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see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt */
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/****************************************************************************
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* SSARAM
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***************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <gccore.h>
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#include "ssaram.h"
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static char aramfix[2048] ATTRIBUTE_ALIGN(32);
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#define ARAMSTART 0x8000
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#define ARAM_READ 1
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#define ARAM_WRITE 0
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/****************************************************************************
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* ARAMPut
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*
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* This version of ARAMPut fixes up those segments which are misaligned.
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* The IPL rules for DOLs is that they must contain 32byte aligned sections with
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* 32byte aligned lengths.
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*
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* The reality is that most homebrew DOLs don't adhere to this.
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****************************************************************************/
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void ARAMPut(char *src, char *dst, int len)
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{
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u32 misalignaddress;
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u32 misalignedbytes;
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u32 misalignedbytestodo;
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int i, block;
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int offset = 0;
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/*** Check destination alignment ***/
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if ((u32) dst & 0x1f)
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{
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/*** Retrieve previous 32 byte section ***/
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misalignaddress = ((u32) dst & ~0x1f);
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misalignedbytestodo = 32 - ((u32) dst & 0x1f);
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misalignedbytes = ((u32) dst & 0x1f);
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ARAMFetch(aramfix, (char *) misalignaddress, 32);
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/*** Update from source ***/
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memcpy(aramfix + misalignedbytes, src, misalignedbytestodo);
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/*** Put it back ***/
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DCFlushRange(aramfix, 32);
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AR_StartDMA(ARAM_WRITE, (u32) aramfix, (u32) dst & ~0x1f, 32);
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while (AR_GetDMAStatus());
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/*** Update pointers ***/
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src += misalignedbytestodo;
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len -= misalignedbytestodo;
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dst = (char *) (((u32) dst & ~0x1f) + 32);
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}
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/*** Move 2k blocks - saves aligning source buffer ***/
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block = (len >> 11);
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for (i = 0; i < block; i++)
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{
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memcpy(aramfix, src + offset, 2048);
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DCFlushRange(aramfix, 2048);
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AR_StartDMA(ARAM_WRITE, (u32) aramfix, (u32) dst + offset, 2048);
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while (AR_GetDMAStatus());
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offset += 2048;
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}
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/*** Clean up remainder ***/
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len &= 0x7ff;
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if (len)
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{
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block = len & 0x1f; /*** Is length aligned ? ***/
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memcpy(aramfix, src + offset, len & ~0x1f);
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DCFlushRange(aramfix, len & ~0x1f);
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AR_StartDMA(ARAM_WRITE, (u32) aramfix, (u32) dst + offset, len & ~0x1f);
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while (AR_GetDMAStatus());
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if (block)
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{
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offset += len & ~0x1f;
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misalignedbytes = len & 0x1f;
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/*** Do same shuffle as destination alignment ***/
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ARAMFetch(aramfix, dst + offset, 32);
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memcpy(aramfix, src + offset, misalignedbytes);
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DCFlushRange(aramfix, 32);
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AR_StartDMA(ARAM_WRITE, (u32) aramfix, (u32) dst + offset, 32);
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while (AR_GetDMAStatus());
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}
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}
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}
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/****************************************************************************
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* ARAMFetch
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****************************************************************************/
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void ARAMFetch(char *dst, char *src, int len)
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{
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DCInvalidateRange(dst, len);
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AR_StartDMA(ARAM_READ, (u32) dst, (u32) src, len);
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while (AR_GetDMAStatus());
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}
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