LXR qemu/hw/display/vga-isa-mm.c

   1/*
   2 * QEMU ISA MM VGA Emulator.
   3 *
   4 * Copyright (c) 2003 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 "qemu/osdep.h"
  26#include "qemu/bitops.h"
  27#include "qemu/units.h"
  28#include "migration/vmstate.h"
  29#include "hw/display/vga.h"
  30#include "vga_int.h"
  31#include "ui/pixel_ops.h"
  32
  33#define VGA_RAM_SIZE (8 * MiB)
  34
  35typedef struct ISAVGAMMState {
  36    VGACommonState vga;
  37    int it_shift;
  38} ISAVGAMMState;
  39
  40/* Memory mapped interface */
  41static uint64_t vga_mm_read(void *opaque, hwaddr addr, unsigned size)
  42{
  43    ISAVGAMMState *s = opaque;
  44
  45    return vga_ioport_read(&s->vga, addr >> s->it_shift) &
  46        MAKE_64BIT_MASK(0, size * 8);
  47}
  48
  49static void vga_mm_write(void *opaque, hwaddr addr, uint64_t value,
  50                         unsigned size)
  51{
  52    ISAVGAMMState *s = opaque;
  53
  54    vga_ioport_write(&s->vga, addr >> s->it_shift,
  55                     value & MAKE_64BIT_MASK(0, size * 8));
  56}
  57
  58static const MemoryRegionOps vga_mm_ctrl_ops = {
  59    .read = vga_mm_read,
  60    .write = vga_mm_write,
  61    .valid.min_access_size = 1,
  62    .valid.max_access_size = 4,
  63    .impl.min_access_size = 1,
  64    .impl.max_access_size = 4,
  65    .endianness = DEVICE_NATIVE_ENDIAN,
  66};
  67
  68static void vga_mm_init(ISAVGAMMState *s, hwaddr vram_base,
  69                        hwaddr ctrl_base, int it_shift,
  70                        MemoryRegion *address_space)
  71{
  72    MemoryRegion *s_ioport_ctrl, *vga_io_memory;
  73
  74    s->it_shift = it_shift;
  75    s_ioport_ctrl = g_malloc(sizeof(*s_ioport_ctrl));
  76    memory_region_init_io(s_ioport_ctrl, NULL, &vga_mm_ctrl_ops, s,
  77                          "vga-mm-ctrl", 0x100000);
  78    memory_region_set_flush_coalesced(s_ioport_ctrl);
  79
  80    vga_io_memory = g_malloc(sizeof(*vga_io_memory));
  81    /* XXX: endianness? */
  82    memory_region_init_io(vga_io_memory, NULL, &vga_mem_ops, &s->vga,
  83                          "vga-mem", 0x20000);
  84
  85    vmstate_register(NULL, 0, &vmstate_vga_common, s);
  86
  87    memory_region_add_subregion(address_space, ctrl_base, s_ioport_ctrl);
  88    s->vga.bank_offset = 0;
  89    memory_region_add_subregion(address_space,
  90                                vram_base + 0x000a0000, vga_io_memory);
  91    memory_region_set_coalescing(vga_io_memory);
  92}
  93
  94int isa_vga_mm_init(hwaddr vram_base,
  95                    hwaddr ctrl_base, int it_shift,
  96                    MemoryRegion *address_space)
  97{
  98    ISAVGAMMState *s;
  99
 100    s = g_malloc0(sizeof(*s));
 101
 102    s->vga.vram_size_mb = VGA_RAM_SIZE / MiB;
 103    s->vga.global_vmstate = true;
 104    vga_common_init(&s->vga, NULL);
 105    vga_mm_init(s, vram_base, ctrl_base, it_shift, address_space);
 106
 107    s->vga.con = graphic_console_init(NULL, 0, s->vga.hw_ops, s);
 108
 109    memory_region_add_subregion(address_space,
 110                                VBE_DISPI_LFB_PHYSICAL_ADDRESS,
 111                                &s->vga.vram);
 112
 113    return 0;
 114}
 115