CfgUSBLoader/cios/dip_frag/dma.c
2015-01-17 10:11:08 +00:00

56 lines
1.5 KiB
C

/*
* DIP plugin for Custom IOS.
*
* Copyright (C) 2008-2010 Waninkoko, WiiGator.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "types.h"
/* DMA constants */
#define DMA1_START_ADDRESS 0x00000000
#define DMA1_END_ADDRESS 0x01800000
#define DMA2_START_ADDRESS 0x10000000
#define DMA2_END_ADDRESS 0x13618000
s32 DMA_CheckRange(void *outbuf, u32 size, u32 alignment)
{
u32 mem;
s32 ret = 0;
/* Output buffer address */
mem = (u32)outbuf;
/* Check for memory alignment */
if (!(mem & 31)) {
u32 dmalen = 0;
/* DMA1 range check */
if ((mem >= DMA1_START_ADDRESS) && (mem < DMA1_END_ADDRESS))
dmalen = (DMA1_END_ADDRESS - mem);
/* DMA2 range check */
if ((mem >= DMA2_START_ADDRESS) && (mem < DMA2_END_ADDRESS))
dmalen = (DMA2_END_ADDRESS - mem);
if (dmalen >= alignment)
ret = (dmalen < size) ? dmalen : size;
ret -= (ret & (alignment - 1));
}
return ret;
}