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https://github.com/ekeeke/Genesis-Plus-GX.git
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67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/**
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* Nintendo GameCube ARAM Wrapper for libOGC aram.c
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*
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* This is an often overlooked area of ~16Mb extra RAM
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* It's use in Genesis Plus is to shadow the ROM.
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* Actually, only SSF2TNC needs shadowing, but it's always
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* Good to know :)
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*/
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#include "shared.h"
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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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* StartARAM
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* This simply sets up the call to internal libOGC.
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* Passing NULL for array list, and 0 items to allocate.
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* Required so libOGC knows to handle any interrupts etc.
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*/
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void
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StartARAM ()
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{
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AR_Init (NULL, 0);
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}
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/**
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* ARAMPut
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*
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* Move data from MAIN memory to ARAM
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*/
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void
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ARAMPut (char *src, char *dst, int len)
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{
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DCFlushRange (src, len);
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AR_StartDMA( ARAM_WRITE, (u32)src, (u32)dst, len);
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while (AR_GetDMAStatus());
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}
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/**
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* ARAMFetch
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*
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* This function will move data from ARAM to MAIN memory
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*/
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void
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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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/**
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* ShadowROM
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* Copy the rom from cart_rom into ARAM
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* NB: libOGC appears to use the first 0x4000 bytes.
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* As there's plenty left, all ARAM addresses are 0x8000 based.
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* Here, the ROM is simply copied in one swift movement :)
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*/
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void
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ShadowROM ()
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{
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ARAMPut ((char *)cart_rom, (void *) ARAMSTART, genromsize);
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}
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