hw/piix_pci.c

   1 /*
   2  * QEMU i440FX/PIIX3 PCI Bridge Emulation
   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 "pc.h"
  27 #include "pci.h"
  28 #include "pci_host.h"
  29 #include "isa.h"
  30 #include "sysbus.h"
  31
  32 /*
  33  * I440FX chipset data sheet.
  34  * http://download.intel.com/design/chipsets/datashts/29054901.pdf
  35  */
  36
  37 typedef PCIHostState I440FXState;
  38
  39 typedef struct PIIX3State {
  40     PCIDevice dev;
  41     int pci_irq_levels[4];
  42     qemu_irq *pic;
  43 } PIIX3State;
  44
  45 struct PCII440FXState {
  46     PCIDevice dev;
  47     target_phys_addr_t isa_page_descs[384 / 4];
  48     uint8_t smm_enabled;
  49     PIIX3State *piix3;
  50 };
  51
  52
  53 #define I440FX_PAM      0x59
  54 #define I440FX_PAM_SIZE 7
  55 #define I440FX_SMRAM    0x72
  56
  57 static void piix3_set_irq(void *opaque, int irq_num, int level);
  58
  59 /* return the global irq number corresponding to a given device irq
  60    pin. We could also use the bus number to have a more precise
  61    mapping. */
  62 static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
  63 {
  64     int slot_addend;
  65     slot_addend = (pci_dev->devfn >> 3) - 1;
  66     return (irq_num + slot_addend) & 3;
  67 }
  68
  69 static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r)
  70 {
  71     uint32_t addr;
  72
  73     //    printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
  74     switch(r) {
  75     case 3:
  76         /* RAM */
  77         cpu_register_physical_memory(start, end - start,
  78                                      start);
  79         break;
  80     case 1:
  81         /* ROM (XXX: not quite correct) */
  82         cpu_register_physical_memory(start, end - start,
  83                                      start | IO_MEM_ROM);
  84         break;
  85     case 2:
  86     case 0:
  87         /* XXX: should distinguish read/write cases */
  88         for(addr = start; addr < end; addr += 4096) {
  89             cpu_register_physical_memory(addr, 4096,
  90                                          d->isa_page_descs[(addr - 0xa0000) >> 12]);
  91         }
  92         break;
  93     }
  94 }
  95
  96 static void i440fx_update_memory_mappings(PCII440FXState *d)
  97 {
  98     int i, r;
  99     uint32_t smram, addr;
 100
 101     update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3);
 102     for(i = 0; i < 12; i++) {
 103         r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
 104         update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
 105     }
 106     smram = d->dev.config[I440FX_SMRAM];
 107     if ((d->smm_enabled && (smram & 0x08)) || (smram & 0x40)) {
 108         cpu_register_physical_memory(0xa0000, 0x20000, 0xa0000);
 109     } else {
 110         for(addr = 0xa0000; addr < 0xc0000; addr += 4096) {
 111             cpu_register_physical_memory(addr, 4096,
 112                                          d->isa_page_descs[(addr - 0xa0000) >> 12]);
 113         }
 114     }
 115 }
 116
 117 static void i440fx_set_smm(int val, void *arg)
 118 {
 119     PCII440FXState *d = arg;
 120
 121     val = (val != 0);
 122     if (d->smm_enabled != val) {
 123         d->smm_enabled = val;
 124         i440fx_update_memory_mappings(d);
 125     }
 126 }
 127
 128
 129 /* XXX: suppress when better memory API. We make the assumption that
 130    no device (in particular the VGA) changes the memory mappings in
 131    the 0xa0000-0x100000 range */
 132 void i440fx_init_memory_mappings(PCII440FXState *d)
 133 {
 134     int i;
 135     for(i = 0; i < 96; i++) {
 136         d->isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
 137     }
 138 }
 139
 140 static void i440fx_write_config(PCIDevice *dev,
 141                                 uint32_t address, uint32_t val, int len)
 142 {
 143     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
 144
 145     /* XXX: implement SMRAM.D_LOCK */
 146     pci_default_write_config(dev, address, val, len);
 147     if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
 148         range_covers_byte(address, len, I440FX_SMRAM)) {
 149         i440fx_update_memory_mappings(d);
 150     }
 151 }
 152
 153 static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
 154 {
 155     PCII440FXState *d = opaque;
 156     int ret, i;
 157
 158     ret = pci_device_load(&d->dev, f);
 159     if (ret < 0)
 160         return ret;
 161     i440fx_update_memory_mappings(d);
 162     qemu_get_8s(f, &d->smm_enabled);
 163
 164     if (version_id == 2)
 165         for (i = 0; i < 4; i++)
 166             d->piix3->pci_irq_levels[i] = qemu_get_be32(f);
 167
 168     return 0;
 169 }
 170
 171 static int i440fx_post_load(void *opaque, int version_id)
 172 {
 173     PCII440FXState *d = opaque;
 174
 175     i440fx_update_memory_mappings(d);
 176     return 0;
 177 }
 178
 179 static const VMStateDescription vmstate_i440fx = {
 180     .name = "I440FX",
 181     .version_id = 3,
 182     .minimum_version_id = 3,
 183     .minimum_version_id_old = 1,
 184     .load_state_old = i440fx_load_old,
 185     .post_load = i440fx_post_load,
 186     .fields      = (VMStateField []) {
 187         VMSTATE_PCI_DEVICE(dev, PCII440FXState),
 188         VMSTATE_UINT8(smm_enabled, PCII440FXState),
 189         VMSTATE_END_OF_LIST()
 190     }
 191 };
 192
 193 static int i440fx_pcihost_initfn(SysBusDevice *dev)
 194 {
 195     I440FXState *s = FROM_SYSBUS(I440FXState, dev);
 196
 197     pci_host_conf_register_ioport(0xcf8, s);
 198
 199     pci_host_data_register_ioport(0xcfc, s);
 200     return 0;
 201 }
 202
 203 static int i440fx_initfn(PCIDevice *dev)
 204 {
 205     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
 206
 207     pci_config_set_vendor_id(d->dev.config, PCI_VENDOR_ID_INTEL);
 208     pci_config_set_device_id(d->dev.config, PCI_DEVICE_ID_INTEL_82441);
 209     d->dev.config[0x08] = 0x02; // revision
 210     pci_config_set_class(d->dev.config, PCI_CLASS_BRIDGE_HOST);
 211
 212     d->dev.config[I440FX_SMRAM] = 0x02;
 213
 214     cpu_smm_register(&i440fx_set_smm, d);
 215     return 0;
 216 }
 217
 218 PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *pic, ram_addr_t ram_size)
 219 {
 220     DeviceState *dev;
 221     PCIBus *b;
 222     PCIDevice *d;
 223     I440FXState *s;
 224     PIIX3State *piix3;
 225
 226     dev = qdev_create(NULL, "i440FX-pcihost");
 227     s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));
 228     b = pci_bus_new(&s->busdev.qdev, NULL, 0);
 229     s->bus = b;
 230     qdev_init_nofail(dev);
 231
 232     d = pci_create_simple(b, 0, "i440FX");
 233     *pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);
 234
 235     piix3 = DO_UPCAST(PIIX3State, dev,
 236                                  pci_create_simple(b, -1, "PIIX3"));
 237     piix3->pic = pic;
 238     pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3, 4);
 239     (*pi440fx_state)->piix3 = piix3;
 240
 241     *piix3_devfn = piix3->dev.devfn;
 242
 243     ram_size = ram_size / 8 / 1024 / 1024;
 244     if (ram_size > 255)
 245         ram_size = 255;
 246     (*pi440fx_state)->dev.config[0x57]=ram_size;
 247
 248     return b;
 249 }
 250
 251 /* PIIX3 PCI to ISA bridge */
 252
 253 static void piix3_set_irq(void *opaque, int irq_num, int level)
 254 {
 255     int i, pic_irq, pic_level;
 256     PIIX3State *piix3 = opaque;
 257
 258     piix3->pci_irq_levels[irq_num] = level;
 259
 260     /* now we change the pic irq level according to the piix irq mappings */
 261     /* XXX: optimize */
 262     pic_irq = piix3->dev.config[0x60 + irq_num];
 263     if (pic_irq < 16) {
 264         /* The pic level is the logical OR of all the PCI irqs mapped
 265            to it */
 266         pic_level = 0;
 267         for (i = 0; i < 4; i++) {
 268             if (pic_irq == piix3->dev.config[0x60 + i])
 269                 pic_level |= piix3->pci_irq_levels[i];
 270         }
 271         qemu_set_irq(piix3->pic[pic_irq], pic_level);
 272     }
 273 }
 274
 275 static void piix3_reset(void *opaque)
 276 {
 277     PIIX3State *d = opaque;
 278     uint8_t *pci_conf = d->dev.config;
 279
 280     pci_conf[0x04] = 0x07; // master, memory and I/O
 281     pci_conf[0x05] = 0x00;
 282     pci_conf[0x06] = 0x00;
 283     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
 284     pci_conf[0x4c] = 0x4d;
 285     pci_conf[0x4e] = 0x03;
 286     pci_conf[0x4f] = 0x00;
 287     pci_conf[0x60] = 0x80;
 288     pci_conf[0x61] = 0x80;
 289     pci_conf[0x62] = 0x80;
 290     pci_conf[0x63] = 0x80;
 291     pci_conf[0x69] = 0x02;
 292     pci_conf[0x70] = 0x80;
 293     pci_conf[0x76] = 0x0c;
 294     pci_conf[0x77] = 0x0c;
 295     pci_conf[0x78] = 0x02;
 296     pci_conf[0x79] = 0x00;
 297     pci_conf[0x80] = 0x00;
 298     pci_conf[0x82] = 0x00;
 299     pci_conf[0xa0] = 0x08;
 300     pci_conf[0xa2] = 0x00;
 301     pci_conf[0xa3] = 0x00;
 302     pci_conf[0xa4] = 0x00;
 303     pci_conf[0xa5] = 0x00;
 304     pci_conf[0xa6] = 0x00;
 305     pci_conf[0xa7] = 0x00;
 306     pci_conf[0xa8] = 0x0f;
 307     pci_conf[0xaa] = 0x00;
 308     pci_conf[0xab] = 0x00;
 309     pci_conf[0xac] = 0x00;
 310     pci_conf[0xae] = 0x00;
 311
 312     memset(d->pci_irq_levels, 0, sizeof(d->pci_irq_levels));
 313 }
 314
 315 static const VMStateDescription vmstate_piix3 = {
 316     .name = "PIIX3",
 317     .version_id = 3,
 318     .minimum_version_id = 2,
 319     .minimum_version_id_old = 2,
 320     .fields      = (VMStateField []) {
 321         VMSTATE_PCI_DEVICE(dev, PIIX3State),
 322         VMSTATE_INT32_ARRAY_V(pci_irq_levels, PIIX3State, 4, 3),
 323         VMSTATE_END_OF_LIST()
 324     }
 325 };
 326
 327 static int piix3_initfn(PCIDevice *dev)
 328 {
 329     PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);
 330     uint8_t *pci_conf;
 331
 332     isa_bus_new(&d->dev.qdev);
 333
 334     pci_conf = d->dev.config;
 335     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
 336     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371SB_0); // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
 337     pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_ISA);
 338     pci_conf[PCI_HEADER_TYPE] =
 339         PCI_HEADER_TYPE_NORMAL | PCI_HEADER_TYPE_MULTI_FUNCTION; // header_type = PCI_multifunction, generic
 340
 341     qemu_register_reset(piix3_reset, d);
 342     return 0;
 343 }
 344
 345 static PCIDeviceInfo i440fx_info[] = {
 346     {
 347         .qdev.name    = "i440FX",
 348         .qdev.desc    = "Host bridge",
 349         .qdev.size    = sizeof(PCII440FXState),
 350         .qdev.vmsd    = &vmstate_i440fx,
 351         .qdev.no_user = 1,
 352         .init         = i440fx_initfn,
 353         .config_write = i440fx_write_config,
 354     },{
 355         .qdev.name    = "PIIX3",
 356         .qdev.desc    = "ISA bridge",
 357         .qdev.size    = sizeof(PIIX3State),
 358         .qdev.vmsd    = &vmstate_piix3,
 359         .qdev.no_user = 1,
 360         .init         = piix3_initfn,
 361     },{
 362         /* end of list */
 363     }
 364 };
 365
 366 static SysBusDeviceInfo i440fx_pcihost_info = {
 367     .init         = i440fx_pcihost_initfn,
 368     .qdev.name    = "i440FX-pcihost",
 369     .qdev.size    = sizeof(I440FXState),
 370     .qdev.no_user = 1,
 371 };
 372
 373 static void i440fx_register(void)
 374 {
 375     sysbus_register_withprop(&i440fx_pcihost_info);
 376     pci_qdev_register_many(i440fx_info);
 377 }
 378 device_init(i440fx_register);