s_w0.c

/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include "libspu2_internal.h"
 
unsigned int SpuWrite0(unsigned int size)
{
    u32 old_tmode;
    int ck_1;
    int ck_2;
    u32 tsa;
    unsigned int written;
    void (*bk)(void);
 
    old_tmode = _spu_transMode;
    bk = 0;
    ck_1 = 0;
    if ( _spu_transMode == 1 )
    {
        _spu_transMode = 0;
        ck_1 = 1;
    }
    ck_2 = 1;
    tsa = _spu_tsa[1];
    written = 0;
    if ( _spu_transferCallback )
    {
        bk = _spu_transferCallback;
        _spu_transferCallback = 0;
        written = 0;
    }
    while ( ck_2 )
    {
        unsigned int bsize_1;
        int bsize_2;
 
        bsize_1 = size >> 6;
        if ( size < 0x401 )
        {
            bsize_2 = bsize_1 << 6;
            ck_2 = 0;
            if ( (unsigned int)bsize_2 < size )
                bsize_2 += 64;
        }
        else
        {
            bsize_2 = 1024;
        }
        _spu_t(2, tsa);
        _spu_t(1);
        FlushDcache();
        _spu_t(3, _spu_zerobuf, bsize_2);
        while ( !gDMADeliverEvent )
            ;
        gDMADeliverEvent = 0;
        size -= 1024;
        tsa += 512;
        written += bsize_2;
    }
    if ( ck_1 )
        _spu_transMode = old_tmode;
    if ( bk )
    {
        _spu_transferCallback = bk;
    }
    return written;
}