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
  35 typedef struct ISAVGAMMState {
  36     VGACommonState vga;
  37     int it_shift;
  38 } ISAVGAMMState;
  39
  40 /* Memory mapped interface */
  41 static 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
  49 static 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
  58 static 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
  68 static 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
  94 int 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 }