mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/****************************************************************************
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* Nintendo Gamecube DVD Reading Library
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*
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* Low-Level DVD access
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*
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***************************************************************************/
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#include "shared.h"
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#ifdef HW_RVL
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#include "di/di.h"
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#endif
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#ifndef HW_RVL
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static u64 DvdMaxOffset = 0x57057C00; /* 1.4 GB max. by default */
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static vu32* const dvd = (u32*)0xCC006000; /* DVD I/O Address base */
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static u8 *inquiry=(unsigned char *)0x80000004; /* pointer to drive ID */
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#else
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static u64 DvdMaxOffset = 0x118244F00LL; /* 4.7 GB max. */
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#endif
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static u8 DVDreadbuffer[2048] ATTRIBUTE_ALIGN (32); /* data buffer for all DVD operations */
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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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u32 dvd_read (void *dst, u32 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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unsigned char *buffer = (unsigned char *) (unsigned int) DVDreadbuffer;
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DCInvalidateRange((void *)buffer, len);
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#ifndef HW_RVL
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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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/*** Ensure it has completed ***/
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if (dvd[0] & 0x4) return 0;
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#else
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if (DI_ReadDVD(buffer, len >> 11, (u32)(offset >> 11))) return 0;
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#endif
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memcpy (dst, buffer, len);
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return 1;
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}
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return 0;
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}
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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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void dvd_motor_off( )
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{
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#ifndef HW_RVL
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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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#else
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DI_StopMotor();
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#endif
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}
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#ifndef HW_RVL
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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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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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/****************************************************************************
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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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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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