mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-26 11:11:48 +01:00
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/****************************************************************************
|
|
* Genesis Plus 1.2a
|
|
*
|
|
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
***************************************************************************/
|
|
#include "shared.h"
|
|
|
|
#define ARAMSTART 0x8000
|
|
|
|
/**
|
|
* Nintendo GameCube ARAM Wrapper for libOGC aram.c
|
|
*
|
|
* This is an often overlooked area of ~16Mb extra RAM
|
|
* It's use in Genesis Plus is to shadow the ROM.
|
|
* Actually, only SSF2TNC needs shadowing, but it's always
|
|
* Good to know :)
|
|
*/
|
|
|
|
#define ARAM_READ 1
|
|
#define ARAM_WRITE 0
|
|
|
|
/**
|
|
* StartARAM
|
|
* This simply sets up the call to internal libOGC.
|
|
* Passing NULL for array list, and 0 items to allocate.
|
|
* Required so libOGC knows to handle any interrupts etc.
|
|
*/
|
|
void
|
|
StartARAM ()
|
|
{
|
|
AR_Init (NULL, 0);
|
|
}
|
|
|
|
/**
|
|
* ARAMPut
|
|
*
|
|
* Move data from MAIN memory to ARAM
|
|
*/
|
|
void
|
|
ARAMPut (char *src, char *dst, int len)
|
|
{
|
|
DCFlushRange (src, len);
|
|
AR_StartDMA( ARAM_WRITE, (u32)src, (u32)dst, len);
|
|
while (AR_GetDMAStatus());
|
|
}
|
|
|
|
/**
|
|
* ARAMFetch
|
|
*
|
|
* This function will move data from ARAM to MAIN memory
|
|
*/
|
|
void
|
|
ARAMFetch (char *dst, char *src, int len)
|
|
{
|
|
DCInvalidateRange(dst, len);
|
|
AR_StartDMA( ARAM_READ, (u32) dst, (u32) src, len);
|
|
while (AR_GetDMAStatus());
|
|
}
|
|
|
|
/**
|
|
* ShadowROM
|
|
* Copy the rom from cart_rom into ARAM
|
|
* NB: libOGC appears to use the first 0x4000 bytes.
|
|
* As there's plenty left, all ARAM addresses are 0x8000 based.
|
|
* Here, the ROM is simply copied in one swift movement :)
|
|
*/
|
|
void
|
|
ShadowROM ()
|
|
{
|
|
ARAMPut (cart_rom, (void *) ARAMSTART, genromsize);
|
|
}
|