コード例 #1
0
ファイル: piix.c プロジェクト: PeladoFeo/PCem-X
void piix_bus_master_write(uint16_t port, uint8_t val, void *priv)
{
        int channel = (port & 8) ? 1 : 0;
//        pclog("PIIX Bus Master write %04X %02X %04x:%08x\n", port, val, CS, pc);
        switch (port & 7)
        {
                case 0:
                if ((val & 1) && !(piix_busmaster[channel].command & 1)) /*Start*/
                {
                        piix_busmaster[channel].ptr_cur = piix_busmaster[channel].ptr;
                        piix_bus_master_next_addr(channel);
                        piix_busmaster[channel].status |= 1;
                }
                if (!(val & 1) && (piix_busmaster[channel].command & 1)) /*Stop*/
                   piix_busmaster[channel].status &= ~1;
                   
                piix_busmaster[channel].command = val;
                break;
                case 2:
                piix_busmaster[channel].status = (val & 0x60) | ((piix_busmaster[channel].status & ~val) & 6) | (piix_busmaster[channel].status & 1);
                break;
                case 4:
                piix_busmaster[channel].ptr = (piix_busmaster[channel].ptr & 0xffffff00) | val;
                break;
                case 5:
                piix_busmaster[channel].ptr = (piix_busmaster[channel].ptr & 0xffff00ff) | (val << 8);
                break;
                case 6:
                piix_busmaster[channel].ptr = (piix_busmaster[channel].ptr & 0xff00ffff) | (val << 16);
                break;
                case 7:
                piix_busmaster[channel].ptr = (piix_busmaster[channel].ptr & 0x00ffffff) | (val << 24);
                break;
        }
}
コード例 #2
0
ファイル: piix.c プロジェクト: aliaspider/PCem-mooch
int piix_bus_master_sector_read(int channel, uint8_t *data)
{
        int transferred = 0;
        
        if (!(piix_busmaster[channel].status & 1))
           return 1;                                    /*DMA disabled*/
           
        while (transferred < 512)
        {
                if (piix_busmaster[channel].count < (512 - transferred) && piix_busmaster[channel].eot)
                   fatal("DMA on channel %i - Read count less than 512! Addr %08X Count %04X EOT %i\n", channel, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);

                mem_invalidate_range(piix_busmaster[channel].addr, piix_busmaster[channel].addr+511);
                
                if (piix_busmaster[channel].count < (512 - transferred))
                {
//                        pclog("Transferring smaller - %i bytes\n", piix_busmaster[channel].count);
                        memcpy(&ram[piix_busmaster[channel].addr], data + transferred, piix_busmaster[channel].count);
                        transferred += piix_busmaster[channel].count;
                        piix_busmaster[channel].addr += piix_busmaster[channel].count;
			piix_busmaster[channel].addr %= (mem_size * 1024);
                        piix_busmaster[channel].count = 0;
                }                       
                else
                {
//                        pclog("Transferring larger - %i bytes\n", 512 - transferred);
                        memcpy(&ram[piix_busmaster[channel].addr], data + transferred, 512 - transferred);
                        piix_busmaster[channel].addr += (512 - transferred);
                        piix_busmaster[channel].count -= (512 - transferred);
                        transferred += (512 - transferred);                        
                }

//                pclog("DMA on channel %i - Addr %08X Count %04X EOT %i\n", channel, piix_busmaster[channel].addr, piix_busmaster[channel].count, piix_busmaster[channel].eot);

                if (!piix_busmaster[channel].count)
                {
//                        pclog("DMA on channel %i - block over\n", channel);
                        if (piix_busmaster[channel].eot) /*End of transfer?*/
                        {
//                                pclog("DMA on channel %i - transfer over\n", channel);
                                piix_busmaster[channel].status &= ~1;
                        }
                        else
                           piix_bus_master_next_addr(channel);
                }
        }
        return 0;
}