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 "vl.h"
  26 typedef uint32_t pci_addr_t;
  27 #include "pci_host.h"
  28
  29 typedef PCIHostState I440FXState;
  30
  31 static void i440fx_addr_writel(void* opaque, uint32_t addr, uint32_t val)
  32 {
  33     I440FXState *s = opaque;
  34     s->config_reg = val;
  35 }
  36
  37 static uint32_t i440fx_addr_readl(void* opaque, uint32_t addr)
  38 {
  39     I440FXState *s = opaque;
  40     return s->config_reg;
  41 }
  42
  43 static void piix3_set_irq(void *pic, int irq_num, int level);
  44
  45 /* return the global irq number corresponding to a given device irq
  46    pin. We could also use the bus number to have a more precise
  47    mapping. */
  48 static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
  49 {
  50     int slot_addend;
  51     slot_addend = (pci_dev->devfn >> 3) - 1;
  52     return (irq_num + slot_addend) & 3;
  53 }
  54
  55 static uint32_t isa_page_descs[384 / 4];
  56 static uint8_t smm_enabled;
  57
  58 static void update_pam(PCIDevice *d, uint32_t start, uint32_t end, int r)
  59 {
  60     uint32_t addr;
  61
  62     //    printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
  63     switch(r) {
  64     case 3:
  65         /* RAM */
  66         cpu_register_physical_memory(start, end - start,
  67                                      start);
  68         break;
  69     case 1:
  70         /* ROM (XXX: not quite correct) */
  71         cpu_register_physical_memory(start, end - start,
  72                                      start | IO_MEM_ROM);
  73         break;
  74     case 2:
  75     case 0:
  76         /* XXX: should distinguish read/write cases */
  77         for(addr = start; addr < end; addr += 4096) {
  78             cpu_register_physical_memory(addr, 4096,
  79                                          isa_page_descs[(addr - 0xa0000) >> 12]);
  80         }
  81         break;
  82     }
  83 }
  84
  85 static void i440fx_update_memory_mappings(PCIDevice *d)
  86 {
  87     int i, r;
  88     uint32_t smram, addr;
  89
  90     update_pam(d, 0xf0000, 0x100000, (d->config[0x59] >> 4) & 3);
  91     for(i = 0; i < 12; i++) {
  92         r = (d->config[(i >> 1) + 0x5a] >> ((i & 1) * 4)) & 3;
  93         update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
  94     }
  95     smram = d->config[0x72];
  96     if ((smm_enabled && (smram & 0x08)) || (smram & 0x40)) {
  97         cpu_register_physical_memory(0xa0000, 0x20000, 0xa0000);
  98     } else {
  99         for(addr = 0xa0000; addr < 0xc0000; addr += 4096) {
 100             cpu_register_physical_memory(addr, 4096,
 101                                          isa_page_descs[(addr - 0xa0000) >> 12]);
 102         }
 103     }
 104 }
 105
 106 void i440fx_set_smm(PCIDevice *d, int val)
 107 {
 108     val = (val != 0);
 109     if (smm_enabled != val) {
 110         smm_enabled = val;
 111         i440fx_update_memory_mappings(d);
 112     }
 113 }
 114
 115
 116 /* XXX: suppress when better memory API. We make the assumption that
 117    no device (in particular the VGA) changes the memory mappings in
 118    the 0xa0000-0x100000 range */
 119 void i440fx_init_memory_mappings(PCIDevice *d)
 120 {
 121     int i;
 122     for(i = 0; i < 96; i++) {
 123         isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
 124     }
 125 }
 126
 127 static void i440fx_write_config(PCIDevice *d,
 128                                 uint32_t address, uint32_t val, int len)
 129 {
 130     /* XXX: implement SMRAM.D_LOCK */
 131     pci_default_write_config(d, address, val, len);
 132     if ((address >= 0x59 && address <= 0x5f) || address == 0x72)
 133         i440fx_update_memory_mappings(d);
 134 }
 135
 136 static void i440fx_save(QEMUFile* f, void *opaque)
 137 {
 138     PCIDevice *d = opaque;
 139     pci_device_save(d, f);
 140     qemu_put_8s(f, &smm_enabled);
 141 }
 142
 143 static int i440fx_load(QEMUFile* f, void *opaque, int version_id)
 144 {
 145     PCIDevice *d = opaque;
 146     int ret;
 147
 148     if (version_id != 1)
 149         return -EINVAL;
 150     ret = pci_device_load(d, f);
 151     if (ret < 0)
 152         return ret;
 153     i440fx_update_memory_mappings(d);
 154     qemu_get_8s(f, &smm_enabled);
 155     return 0;
 156 }
 157
 158 PCIBus *i440fx_init(PCIDevice **pi440fx_state)
 159 {
 160     PCIBus *b;
 161     PCIDevice *d;
 162     I440FXState *s;
 163
 164     s = qemu_mallocz(sizeof(I440FXState));
 165     b = pci_register_bus(piix3_set_irq, pci_slot_get_pirq, NULL, 0, 4);
 166     s->bus = b;
 167
 168     register_ioport_write(0xcf8, 4, 4, i440fx_addr_writel, s);
 169     register_ioport_read(0xcf8, 4, 4, i440fx_addr_readl, s);
 170
 171     register_ioport_write(0xcfc, 4, 1, pci_host_data_writeb, s);
 172     register_ioport_write(0xcfc, 4, 2, pci_host_data_writew, s);
 173     register_ioport_write(0xcfc, 4, 4, pci_host_data_writel, s);
 174     register_ioport_read(0xcfc, 4, 1, pci_host_data_readb, s);
 175     register_ioport_read(0xcfc, 4, 2, pci_host_data_readw, s);
 176     register_ioport_read(0xcfc, 4, 4, pci_host_data_readl, s);
 177
 178     d = pci_register_device(b, "i440FX", sizeof(PCIDevice), 0,
 179                             NULL, i440fx_write_config);
 180
 181     d->config[0x00] = 0x86; // vendor_id
 182     d->config[0x01] = 0x80;
 183     d->config[0x02] = 0x37; // device_id
 184     d->config[0x03] = 0x12;
 185     d->config[0x08] = 0x02; // revision
 186     d->config[0x0a] = 0x00; // class_sub = host2pci
 187     d->config[0x0b] = 0x06; // class_base = PCI_bridge
 188     d->config[0x0e] = 0x00; // header_type
 189
 190     d->config[0x72] = 0x02; /* SMRAM */
 191
 192     register_savevm("I440FX", 0, 1, i440fx_save, i440fx_load, d);
 193     *pi440fx_state = d;
 194     return b;
 195 }
 196
 197 /* PIIX3 PCI to ISA bridge */
 198
 199 PCIDevice *piix3_dev;
 200
 201 /* just used for simpler irq handling. */
 202 #define PCI_IRQ_WORDS   ((PCI_DEVICES_MAX + 31) / 32)
 203
 204 static int pci_irq_levels[4];
 205
 206 static void piix3_set_irq(void *pic, int irq_num, int level)
 207 {
 208     int i, pic_irq, pic_level;
 209
 210     pci_irq_levels[irq_num] = level;
 211
 212     /* now we change the pic irq level according to the piix irq mappings */
 213     /* XXX: optimize */
 214     pic_irq = piix3_dev->config[0x60 + irq_num];
 215     if (pic_irq < 16) {
 216         /* The pic level is the logical OR of all the PCI irqs mapped
 217            to it */
 218         pic_level = 0;
 219         for (i = 0; i < 4; i++) {
 220             if (pic_irq == piix3_dev->config[0x60 + i])
 221                 pic_level |= pci_irq_levels[i];
 222         }
 223         pic_set_irq(pic_irq, pic_level);
 224     }
 225 }
 226
 227 static void piix3_reset(PCIDevice *d)
 228 {
 229     uint8_t *pci_conf = d->config;
 230
 231     pci_conf[0x04] = 0x07; // master, memory and I/O
 232     pci_conf[0x05] = 0x00;
 233     pci_conf[0x06] = 0x00;
 234     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
 235     pci_conf[0x4c] = 0x4d;
 236     pci_conf[0x4e] = 0x03;
 237     pci_conf[0x4f] = 0x00;
 238     pci_conf[0x60] = 0x80;
 239     pci_conf[0x69] = 0x02;
 240     pci_conf[0x70] = 0x80;
 241     pci_conf[0x76] = 0x0c;
 242     pci_conf[0x77] = 0x0c;
 243     pci_conf[0x78] = 0x02;
 244     pci_conf[0x79] = 0x00;
 245     pci_conf[0x80] = 0x00;
 246     pci_conf[0x82] = 0x00;
 247     pci_conf[0xa0] = 0x08;
 248     pci_conf[0xa0] = 0x08;
 249     pci_conf[0xa2] = 0x00;
 250     pci_conf[0xa3] = 0x00;
 251     pci_conf[0xa4] = 0x00;
 252     pci_conf[0xa5] = 0x00;
 253     pci_conf[0xa6] = 0x00;
 254     pci_conf[0xa7] = 0x00;
 255     pci_conf[0xa8] = 0x0f;
 256     pci_conf[0xaa] = 0x00;
 257     pci_conf[0xab] = 0x00;
 258     pci_conf[0xac] = 0x00;
 259     pci_conf[0xae] = 0x00;
 260 }
 261
 262 static void piix_save(QEMUFile* f, void *opaque)
 263 {
 264     PCIDevice *d = opaque;
 265     pci_device_save(d, f);
 266 }
 267
 268 static int piix_load(QEMUFile* f, void *opaque, int version_id)
 269 {
 270     PCIDevice *d = opaque;
 271     if (version_id != 2)
 272         return -EINVAL;
 273     return pci_device_load(d, f);
 274 }
 275
 276 int piix3_init(PCIBus *bus, int devfn)
 277 {
 278     PCIDevice *d;
 279     uint8_t *pci_conf;
 280
 281     d = pci_register_device(bus, "PIIX3", sizeof(PCIDevice),
 282                                     devfn, NULL, NULL);
 283     register_savevm("PIIX3", 0, 2, piix_save, piix_load, d);
 284
 285     piix3_dev = d;
 286     pci_conf = d->config;
 287
 288     pci_conf[0x00] = 0x86; // Intel
 289     pci_conf[0x01] = 0x80;
 290     pci_conf[0x02] = 0x00; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
 291     pci_conf[0x03] = 0x70;
 292     pci_conf[0x0a] = 0x01; // class_sub = PCI_ISA
 293     pci_conf[0x0b] = 0x06; // class_base = PCI_bridge
 294     pci_conf[0x0e] = 0x80; // header_type = PCI_multifunction, generic
 295
 296     piix3_reset(d);
 297     return d->devfn;
 298 }