hw/isa_mmio.c

   1 /*
   2  * Memory mapped access to ISA IO space.
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "hw.h"
  26 #include "isa.h"
  27 #include "exec/address-spaces.h"
  28
  29 static void isa_mmio_writeb (void *opaque, hwaddr addr,
  30                                   uint32_t val)
  31 {
  32     cpu_outb(addr & IOPORTS_MASK, val);
  33 }
  34
  35 static void isa_mmio_writew(void *opaque, hwaddr addr,
  36                                uint32_t val)
  37 {
  38     cpu_outw(addr & IOPORTS_MASK, val);
  39 }
  40
  41 static void isa_mmio_writel(void *opaque, hwaddr addr,
  42                                uint32_t val)
  43 {
  44     cpu_outl(addr & IOPORTS_MASK, val);
  45 }
  46
  47 static uint32_t isa_mmio_readb (void *opaque, hwaddr addr)
  48 {
  49     return cpu_inb(addr & IOPORTS_MASK);
  50 }
  51
  52 static uint32_t isa_mmio_readw(void *opaque, hwaddr addr)
  53 {
  54     return cpu_inw(addr & IOPORTS_MASK);
  55 }
  56
  57 static uint32_t isa_mmio_readl(void *opaque, hwaddr addr)
  58 {
  59     return cpu_inl(addr & IOPORTS_MASK);
  60 }
  61
  62 static const MemoryRegionOps isa_mmio_ops = {
  63     .old_mmio = {
  64         .write = { isa_mmio_writeb, isa_mmio_writew, isa_mmio_writel },
  65         .read = { isa_mmio_readb, isa_mmio_readw, isa_mmio_readl, },
  66     },
  67     .endianness = DEVICE_LITTLE_ENDIAN,
  68 };
  69
  70 void isa_mmio_setup(MemoryRegion *mr, hwaddr size)
  71 {
  72     memory_region_init_io(mr, &isa_mmio_ops, NULL, "isa-mmio", size);
  73 }
  74
  75 void isa_mmio_init(hwaddr base, hwaddr size)
  76 {
  77     MemoryRegion *mr = g_malloc(sizeof(*mr));
  78
  79     isa_mmio_setup(mr, size);
  80     memory_region_add_subregion(get_system_memory(), base, mr);
  81 }