hw/vga-pci.c

   1 /*
   2  * QEMU PCI VGA Emulator.
   3  *
   4  * see docs/specs/standard-vga.txt for virtual hardware specs.
   5  *
   6  * Copyright (c) 2003 Fabrice Bellard
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26 #include "hw.h"
  27 #include "ui/console.h"
  28 #include "pci/pci.h"
  29 #include "vga_int.h"
  30 #include "ui/pixel_ops.h"
  31 #include "qemu/timer.h"
  32 #include "loader.h"
  33
  34 #define PCI_VGA_IOPORT_OFFSET 0x400
  35 #define PCI_VGA_IOPORT_SIZE   (0x3e0 - 0x3c0)
  36 #define PCI_VGA_BOCHS_OFFSET  0x500
  37 #define PCI_VGA_BOCHS_SIZE    (0x0b * 2)
  38 #define PCI_VGA_MMIO_SIZE     0x1000
  39
  40 enum vga_pci_flags {
  41     PCI_VGA_FLAG_ENABLE_MMIO = 1,
  42 };
  43
  44 typedef struct PCIVGAState {
  45     PCIDevice dev;
  46     VGACommonState vga;
  47     uint32_t flags;
  48     MemoryRegion mmio;
  49     MemoryRegion ioport;
  50     MemoryRegion bochs;
  51 } PCIVGAState;
  52
  53 static const VMStateDescription vmstate_vga_pci = {
  54     .name = "vga",
  55     .version_id = 2,
  56     .minimum_version_id = 2,
  57     .minimum_version_id_old = 2,
  58     .fields      = (VMStateField []) {
  59         VMSTATE_PCI_DEVICE(dev, PCIVGAState),
  60         VMSTATE_STRUCT(vga, PCIVGAState, 0, vmstate_vga_common, VGACommonState),
  61         VMSTATE_END_OF_LIST()
  62     }
  63 };
  64
  65 static uint64_t pci_vga_ioport_read(void *ptr, hwaddr addr,
  66                                     unsigned size)
  67 {
  68     PCIVGAState *d = ptr;
  69     uint64_t ret = 0;
  70
  71     switch (size) {
  72     case 1:
  73         ret = vga_ioport_read(&d->vga, addr);
  74         break;
  75     case 2:
  76         ret  = vga_ioport_read(&d->vga, addr);
  77         ret |= vga_ioport_read(&d->vga, addr+1) << 8;
  78         break;
  79     }
  80     return ret;
  81 }
  82
  83 static void pci_vga_ioport_write(void *ptr, hwaddr addr,
  84                                  uint64_t val, unsigned size)
  85 {
  86     PCIVGAState *d = ptr;
  87
  88     switch (size) {
  89     case 1:
  90         vga_ioport_write(&d->vga, addr + 0x3c0, val);
  91         break;
  92     case 2:
  93         /*
  94          * Update bytes in little endian order.  Allows to update
  95          * indexed registers with a single word write because the
  96          * index byte is updated first.
  97          */
  98         vga_ioport_write(&d->vga, addr + 0x3c0, val & 0xff);
  99         vga_ioport_write(&d->vga, addr + 0x3c1, (val >> 8) & 0xff);
 100         break;
 101     }
 102 }
 103
 104 static const MemoryRegionOps pci_vga_ioport_ops = {
 105     .read = pci_vga_ioport_read,
 106     .write = pci_vga_ioport_write,
 107     .valid.min_access_size = 1,
 108     .valid.max_access_size = 4,
 109     .impl.min_access_size = 1,
 110     .impl.max_access_size = 2,
 111     .endianness = DEVICE_LITTLE_ENDIAN,
 112 };
 113
 114 static uint64_t pci_vga_bochs_read(void *ptr, hwaddr addr,
 115                                    unsigned size)
 116 {
 117     PCIVGAState *d = ptr;
 118     int index = addr >> 1;
 119
 120     vbe_ioport_write_index(&d->vga, 0, index);
 121     return vbe_ioport_read_data(&d->vga, 0);
 122 }
 123
 124 static void pci_vga_bochs_write(void *ptr, hwaddr addr,
 125                                 uint64_t val, unsigned size)
 126 {
 127     PCIVGAState *d = ptr;
 128     int index = addr >> 1;
 129
 130     vbe_ioport_write_index(&d->vga, 0, index);
 131     vbe_ioport_write_data(&d->vga, 0, val);
 132 }
 133
 134 static const MemoryRegionOps pci_vga_bochs_ops = {
 135     .read = pci_vga_bochs_read,
 136     .write = pci_vga_bochs_write,
 137     .valid.min_access_size = 1,
 138     .valid.max_access_size = 4,
 139     .impl.min_access_size = 2,
 140     .impl.max_access_size = 2,
 141     .endianness = DEVICE_LITTLE_ENDIAN,
 142 };
 143
 144 static int pci_std_vga_initfn(PCIDevice *dev)
 145 {
 146     PCIVGAState *d = DO_UPCAST(PCIVGAState, dev, dev);
 147     VGACommonState *s = &d->vga;
 148
 149     /* vga + console init */
 150     vga_common_init(s);
 151     vga_init(s, pci_address_space(dev), pci_address_space_io(dev), true);
 152
 153     s->ds = graphic_console_init(s->update, s->invalidate,
 154                                  s->screen_dump, s->text_update, s);
 155
 156     /* XXX: VGA_RAM_SIZE must be a power of two */
 157     pci_register_bar(&d->dev, 0, PCI_BASE_ADDRESS_MEM_PREFETCH, &s->vram);
 158
 159     /* mmio bar for vga register access */
 160     if (d->flags & (1 << PCI_VGA_FLAG_ENABLE_MMIO)) {
 161         memory_region_init(&d->mmio, "vga.mmio", 4096);
 162         memory_region_init_io(&d->ioport, &pci_vga_ioport_ops, d,
 163                               "vga ioports remapped", PCI_VGA_IOPORT_SIZE);
 164         memory_region_init_io(&d->bochs, &pci_vga_bochs_ops, d,
 165                               "bochs dispi interface", PCI_VGA_BOCHS_SIZE);
 166
 167         memory_region_add_subregion(&d->mmio, PCI_VGA_IOPORT_OFFSET,
 168                                     &d->ioport);
 169         memory_region_add_subregion(&d->mmio, PCI_VGA_BOCHS_OFFSET,
 170                                     &d->bochs);
 171         pci_register_bar(&d->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio);
 172     }
 173
 174     if (!dev->rom_bar) {
 175         /* compatibility with pc-0.13 and older */
 176         vga_init_vbe(s, pci_address_space(dev));
 177     }
 178
 179     return 0;
 180 }
 181
 182 static Property vga_pci_properties[] = {
 183     DEFINE_PROP_UINT32("vgamem_mb", PCIVGAState, vga.vram_size_mb, 16),
 184     DEFINE_PROP_BIT("mmio", PCIVGAState, flags, PCI_VGA_FLAG_ENABLE_MMIO, true),
 185     DEFINE_PROP_END_OF_LIST(),
 186 };
 187
 188 static void vga_class_init(ObjectClass *klass, void *data)
 189 {
 190     DeviceClass *dc = DEVICE_CLASS(klass);
 191     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 192
 193     k->no_hotplug = 1;
 194     k->init = pci_std_vga_initfn;
 195     k->romfile = "vgabios-stdvga.bin";
 196     k->vendor_id = PCI_VENDOR_ID_QEMU;
 197     k->device_id = PCI_DEVICE_ID_QEMU_VGA;
 198     k->class_id = PCI_CLASS_DISPLAY_VGA;
 199     dc->vmsd = &vmstate_vga_pci;
 200     dc->props = vga_pci_properties;
 201 }
 202
 203 static const TypeInfo vga_info = {
 204     .name          = "VGA",
 205     .parent        = TYPE_PCI_DEVICE,
 206     .instance_size = sizeof(PCIVGAState),
 207     .class_init    = vga_class_init,
 208 };
 209
 210 static void vga_register_types(void)
 211 {
 212     type_register_static(&vga_info);
 213 }
 214
 215 type_init(vga_register_types)