hw/mac_dbdma.c

   1 /*
   2  * PowerMac descriptor-based DMA emulation
   3  *
   4  * Copyright (c) 2005-2007 Fabrice Bellard
   5  * Copyright (c) 2007 Jocelyn Mayer
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "hw.h"
  26 #include "ppc_mac.h"
  27
  28 /* DBDMA: currently no op - should suffice right now */
  29
  30 static void dbdma_writeb (void *opaque,
  31                           target_phys_addr_t addr, uint32_t value)
  32 {
  33     printf("%s: 0x" PADDRX " <= 0x%08x\n", __func__, addr, value);
  34 }
  35
  36 static void dbdma_writew (void *opaque,
  37                           target_phys_addr_t addr, uint32_t value)
  38 {
  39 }
  40
  41 static void dbdma_writel (void *opaque,
  42                           target_phys_addr_t addr, uint32_t value)
  43 {
  44 }
  45
  46 static uint32_t dbdma_readb (void *opaque, target_phys_addr_t addr)
  47 {
  48     printf("%s: 0x" PADDRX " => 0x00000000\n", __func__, addr);
  49
  50     return 0;
  51 }
  52
  53 static uint32_t dbdma_readw (void *opaque, target_phys_addr_t addr)
  54 {
  55     return 0;
  56 }
  57
  58 static uint32_t dbdma_readl (void *opaque, target_phys_addr_t addr)
  59 {
  60     return 0;
  61 }
  62
  63 static CPUWriteMemoryFunc *dbdma_write[] = {
  64     &dbdma_writeb,
  65     &dbdma_writew,
  66     &dbdma_writel,
  67 };
  68
  69 static CPUReadMemoryFunc *dbdma_read[] = {
  70     &dbdma_readb,
  71     &dbdma_readw,
  72     &dbdma_readl,
  73 };
  74
  75 void dbdma_init (int *dbdma_mem_index)
  76 {
  77     *dbdma_mem_index = cpu_register_io_memory(0, dbdma_read, dbdma_write, NULL);
  78 }