mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/****************************************************************************
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* Nintendo Gamecube DVD Reading Library
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*
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* This is NOT a complete DVD library, in that it works for reading
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* ISO9660 discs only.
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*
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* If you need softmod drivecodes etc, look elsewhere.
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* There are known issues with libogc dvd handling, so these work
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* outside of it ,if you will.
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*
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* This is ideal for using with a gc-linux self booting DVD only.
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* Go http://www.gc-linux.org for further information and the tools
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* for your platform.
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*
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* To keep libOGC stable, make sure you call DVD_Init before using
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* these functions.
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***************************************************************************/
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#include "shared.h"
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#ifdef HW_DOL
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#include "dvd.h"
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u64 DvdMaxOffset = 0x57057C00;
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/** DVD I/O Address base **/
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static vu32* const dvd = (u32*)0xCC006000;
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static unsigned char *inquiry=(unsigned char *)0x80000004;
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/** Due to lack of memory, we'll use this little 2k keyhole for all DVD operations **/
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unsigned char DVDreadbuffer[2048] ATTRIBUTE_ALIGN (32);
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#else
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#include "wdvd.h"
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u64 DvdMaxOffset = 0x118244F00LL;
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#endif
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/***************************************************************************
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* dvd_read
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*
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* Read DVD disc sectors
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***************************************************************************/
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int dvd_read (void *dst, unsigned int len, u64 offset)
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{
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/*** We only allow 2k reads **/
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if (len > 2048) return 0;
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/*** Let's not read past end of DVD ***/
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if(offset < DvdMaxOffset)
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{
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#ifdef HW_DOL
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unsigned char *buffer = (unsigned char *) (unsigned int) DVDreadbuffer;
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DCInvalidateRange((void *)buffer, len);
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dvd[0] = 0x2E;
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dvd[1] = 0;
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dvd[2] = 0xA8000000;
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dvd[3] = (u32)(offset >> 2);
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dvd[4] = len;
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dvd[5] = (u32) buffer;
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dvd[6] = len;
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dvd[7] = 3;
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/*** Enable reading with DMA ***/
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while (dvd[7] & 1);
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memcpy (dst, buffer, len);
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/*** Ensure it has completed ***/
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if (dvd[0] & 0x4) return 0;
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return 1;
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#elif WII_DVD
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return WDVD_LowUnencryptedRead((unsigned char **)&dst, len, (u32)(offset >> 2));
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#endif
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}
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return 0;
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}
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/****************************************************************************
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* uselessinquiry
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*
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* As the name suggests, this function is quite useless.
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* It's only purpose is to stop any pending DVD interrupts while we use the
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* memcard interface.
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*
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* libOGC tends to foul up if you don't, and sometimes does if you do!
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****************************************************************************/
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#ifdef HW_DOL
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void uselessinquiry ()
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{
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dvd[0] = 0;
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dvd[1] = 0;
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dvd[2] = 0x12000000;
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dvd[3] = 0;
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dvd[4] = 0x20;
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dvd[5] = 0x80000000;
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dvd[6] = 0x20;
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dvd[7] = 1;
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while (dvd[7] & 1);
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}
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#endif
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/****************************************************************************
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* dvd_motor_off
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*
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* Stop the DVD Motor
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*
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* This can be used to prevent the Disc from spinning during playtime
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****************************************************************************/
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#ifdef HW_DOL
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void dvd_motor_off( )
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{
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dvd[0] = 0x2e;
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dvd[1] = 0;
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dvd[2] = 0xe3000000;
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dvd[3] = 0;
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dvd[4] = 0;
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dvd[5] = 0;
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dvd[6] = 0;
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dvd[7] = 1; // Do immediate
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while (dvd[7] & 1);
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/*** PSO Stops blackscreen at reload ***/
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dvd[0] = 0x14;
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dvd[1] = 0;
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}
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#endif
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/****************************************************************************
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* dvd_drive_detect()
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*
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* Detect the DVD Drive Type
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*
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****************************************************************************/
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#ifdef HW_DOL
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void dvd_drive_detect()
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{
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dvd[0] = 0x2e;
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dvd[1] = 0;
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dvd[2] = 0x12000000;
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dvd[3] = 0;
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dvd[4] = 0x20;
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dvd[5] = 0x80000000;
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dvd[6] = 0x20;
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dvd[7] = 3;
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while( dvd[7] & 1 );
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DCFlushRange((void *)0x80000000, 32);
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int driveid = (int)inquiry[2];
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if ((driveid == 4) || (driveid == 6) || (driveid == 8))
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{
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/* Gamecube DVD Drive (1.4 GB)*/
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DvdMaxOffset = 0x57057C00;
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}
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else
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{
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/* Wii DVD Drive (4.7GB) */
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DvdMaxOffset = 0x118244F00LL;
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}
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}
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#endif
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