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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 "qemu/osdep.h"
26 #include "hw/hw.h"
27 #include "hw/i386/pc.h"
28 #include "hw/pci/pci.h"
29 #include "hw/pci/pci_host.h"
30 #include "hw/isa/isa.h"
31 #include "hw/sysbus.h"
32 #include "qapi/error.h"
33 #include "qemu/range.h"
34 #include "hw/xen/xen.h"
35 #include "hw/pci-host/pam.h"
36 #include "sysemu/sysemu.h"
37 #include "hw/i386/ioapic.h"
38 #include "qapi/visitor.h"
39 #include "qemu/error-report.h"
40
41 /*
42  * I440FX chipset data sheet.
43  * http://download.intel.com/design/chipsets/datashts/29054901.pdf
44  */
45
46 #define I440FX_PCI_HOST_BRIDGE(obj) \
47     OBJECT_CHECK(I440FXState, (obj), TYPE_I440FX_PCI_HOST_BRIDGE)
48
49 typedef struct I440FXState {
50     PCIHostState parent_obj;
51     Range pci_hole;
52     uint64_t pci_hole64_size;
53     uint32_t short_root_bus;
54 } I440FXState;
55
56 #define PIIX_NUM_PIC_IRQS       16      /* i8259 * 2 */
57 #define PIIX_NUM_PIRQS          4ULL    /* PIRQ[A-D] */
58 #define XEN_PIIX_NUM_PIRQS      128ULL
59 #define PIIX_PIRQC              0x60
60
61 typedef struct PIIX3State {
62     PCIDevice dev;
63
64     /*
65      * bitmap to track pic levels.
66      * The pic level is the logical OR of all the PCI irqs mapped to it
67      * So one PIC level is tracked by PIIX_NUM_PIRQS bits.
68      *
69      * PIRQ is mapped to PIC pins, we track it by
70      * PIIX_NUM_PIRQS * PIIX_NUM_PIC_IRQS = 64 bits with
71      * pic_irq * PIIX_NUM_PIRQS + pirq
72      */
73 #if PIIX_NUM_PIC_IRQS * PIIX_NUM_PIRQS > 64
74 #error "unable to encode pic state in 64bit in pic_levels."
75 #endif
76     uint64_t pic_levels;
77
78     qemu_irq *pic;
79
80     /* This member isn't used. Just for save/load compatibility */
81     int32_t pci_irq_levels_vmstate[PIIX_NUM_PIRQS];
82
83     /* Reset Control Register contents */
84     uint8_t rcr;
85
86     /* IO memory region for Reset Control Register (RCR_IOPORT) */
87     MemoryRegion rcr_mem;
88 } PIIX3State;
89
90 #define TYPE_PIIX3_PCI_DEVICE "pci-piix3"
91 #define PIIX3_PCI_DEVICE(obj) \
92     OBJECT_CHECK(PIIX3State, (obj), TYPE_PIIX3_PCI_DEVICE)
93
94 #define I440FX_PCI_DEVICE(obj) \
95     OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE)
96
97 struct PCII440FXState {
98     /*< private >*/
99     PCIDevice parent_obj;
100     /*< public >*/
101
102     MemoryRegion *system_memory;
103     MemoryRegion *pci_address_space;
104     MemoryRegion *ram_memory;
105     PAMMemoryRegion pam_regions[13];
106     MemoryRegion smram_region;
107     MemoryRegion smram, low_smram;
108 };
109
110
111 #define I440FX_PAM      0x59
112 #define I440FX_PAM_SIZE 7
113 #define I440FX_SMRAM    0x72
114
115 /* Older coreboot versions (4.0 and older) read a config register that doesn't
116  * exist in real hardware, to get the RAM size from QEMU.
117  */
118 #define I440FX_COREBOOT_RAM_SIZE 0x57
119
120 static void piix3_set_irq(void *opaque, int pirq, int level);
121 static PCIINTxRoute piix3_route_intx_pin_to_irq(void *opaque, int pci_intx);
122 static void piix3_write_config_xen(PCIDevice *dev,
123                                uint32_t address, uint32_t val, int len);
124
125 /* return the global irq number corresponding to a given device irq
126    pin. We could also use the bus number to have a more precise
127    mapping. */
128 static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
129 {
130     int slot_addend;
131     slot_addend = (pci_dev->devfn >> 3) - 1;
132     return (pci_intx + slot_addend) & 3;
133 }
134
135 static void i440fx_update_memory_mappings(PCII440FXState *d)
136 {
137     int i;
138     PCIDevice *pd = PCI_DEVICE(d);
139
140     memory_region_transaction_begin();
141     for (i = 0; i < 13; i++) {
142         pam_update(&d->pam_regions[i], i,
143                    pd->config[I440FX_PAM + ((i + 1) / 2)]);
144     }
145     memory_region_set_enabled(&d->smram_region,
146                               !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN));
147     memory_region_set_enabled(&d->smram,
148                               pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME);
149     memory_region_transaction_commit();
150 }
151
152
153 static void i440fx_write_config(PCIDevice *dev,
154                                 uint32_t address, uint32_t val, int len)
155 {
156     PCII440FXState *d = I440FX_PCI_DEVICE(dev);
157
158     /* XXX: implement SMRAM.D_LOCK */
159     pci_default_write_config(dev, address, val, len);
160     if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
161         range_covers_byte(address, len, I440FX_SMRAM)) {
162         i440fx_update_memory_mappings(d);
163     }
164 }
165
166 static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
167 {
168     PCII440FXState *d = opaque;
169     PCIDevice *pd = PCI_DEVICE(d);
170     int ret, i;
171     uint8_t smm_enabled;
172
173     ret = pci_device_load(pd, f);
174     if (ret < 0)
175         return ret;
176     i440fx_update_memory_mappings(d);
177     qemu_get_8s(f, &smm_enabled);
178
179     if (version_id == 2) {
180         for (i = 0; i < PIIX_NUM_PIRQS; i++) {
181             qemu_get_be32(f); /* dummy load for compatibility */
182         }
183     }
184
185     return 0;
186 }
187
188 static int i440fx_post_load(void *opaque, int version_id)
189 {
190     PCII440FXState *d = opaque;
191
192     i440fx_update_memory_mappings(d);
193     return 0;
194 }
195
196 static const VMStateDescription vmstate_i440fx = {
197     .name = "I440FX",
198     .version_id = 3,
199     .minimum_version_id = 3,
200     .minimum_version_id_old = 1,
201     .load_state_old = i440fx_load_old,
202     .post_load = i440fx_post_load,
203     .fields = (VMStateField[]) {
204         VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState),
205         /* Used to be smm_enabled, which was basically always zero because
206          * SeaBIOS hardly uses SMM.  SMRAM is now handled by CPU code.
207          */
208         VMSTATE_UNUSED(1),
209         VMSTATE_END_OF_LIST()
210     }
211 };
212
213 static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
214                                               const char *name, void *opaque,
215                                               Error **errp)
216 {
217     I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
218     uint64_t val64;
219     uint32_t value;
220
221     val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole);
222     value = val64;
223     assert(value == val64);
224     visit_type_uint32(v, name, &value, errp);
225 }
226
227 static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v,
228                                             const char *name, void *opaque,
229                                             Error **errp)
230 {
231     I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
232     uint64_t val64;
233     uint32_t value;
234
235     val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1;
236     value = val64;
237     assert(value == val64);
238     visit_type_uint32(v, name, &value, errp);
239 }
240
241 static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v,
242                                                 const char *name,
243                                                 void *opaque, Error **errp)
244 {
245     PCIHostState *h = PCI_HOST_BRIDGE(obj);
246     Range w64;
247     uint64_t value;
248
249     pci_bus_get_w64_range(h->bus, &w64);
250     value = range_is_empty(&w64) ? 0 : range_lob(&w64);
251     visit_type_uint64(v, name, &value, errp);
252 }
253
254 static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v,
255                                               const char *name, void *opaque,
256                                               Error **errp)
257 {
258     PCIHostState *h = PCI_HOST_BRIDGE(obj);
259     Range w64;
260     uint64_t value;
261
262     pci_bus_get_w64_range(h->bus, &w64);
263     value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
264     visit_type_uint64(v, name, &value, errp);
265 }
266
267 static void i440fx_pcihost_initfn(Object *obj)
268 {
269     PCIHostState *s = PCI_HOST_BRIDGE(obj);
270
271     memory_region_init_io(&s->conf_mem, obj, &pci_host_conf_le_ops, s,
272                           "pci-conf-idx", 4);
273     memory_region_init_io(&s->data_mem, obj, &pci_host_data_le_ops, s,
274                           "pci-conf-data", 4);
275
276     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "int",
277                         i440fx_pcihost_get_pci_hole_start,
278                         NULL, NULL, NULL, NULL);
279
280     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "int",
281                         i440fx_pcihost_get_pci_hole_end,
282                         NULL, NULL, NULL, NULL);
283
284     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "int",
285                         i440fx_pcihost_get_pci_hole64_start,
286                         NULL, NULL, NULL, NULL);
287
288     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "int",
289                         i440fx_pcihost_get_pci_hole64_end,
290                         NULL, NULL, NULL, NULL);
291 }
292
293 static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
294 {
295     PCIHostState *s = PCI_HOST_BRIDGE(dev);
296     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
297
298     sysbus_add_io(sbd, 0xcf8, &s->conf_mem);
299     sysbus_init_ioports(sbd, 0xcf8, 4);
300
301     sysbus_add_io(sbd, 0xcfc, &s->data_mem);
302     sysbus_init_ioports(sbd, 0xcfc, 4);
303 }
304
305 static void i440fx_realize(PCIDevice *dev, Error **errp)
306 {
307     dev->config[I440FX_SMRAM] = 0x02;
308
309     if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) {
310         error_report("warning: i440fx doesn't support emulated iommu");
311     }
312 }
313
314 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
315                     PCII440FXState **pi440fx_state,
316                     int *piix3_devfn,
317                     ISABus **isa_bus, qemu_irq *pic,
318                     MemoryRegion *address_space_mem,
319                     MemoryRegion *address_space_io,
320                     ram_addr_t ram_size,
321                     ram_addr_t below_4g_mem_size,
322                     ram_addr_t above_4g_mem_size,
323                     MemoryRegion *pci_address_space,
324                     MemoryRegion *ram_memory)
325 {
326     DeviceState *dev;
327     PCIBus *b;
328     PCIDevice *d;
329     PCIHostState *s;
330     PIIX3State *piix3;
331     PCII440FXState *f;
332     unsigned i;
333     I440FXState *i440fx;
334
335     dev = qdev_create(NULL, host_type);
336     s = PCI_HOST_BRIDGE(dev);
337     b = pci_bus_new(dev, NULL, pci_address_space,
338                     address_space_io, 0, TYPE_PCI_BUS);
339     s->bus = b;
340     object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL);
341     qdev_init_nofail(dev);
342
343     d = pci_create_simple(b, 0, pci_type);
344     *pi440fx_state = I440FX_PCI_DEVICE(d);
345     f = *pi440fx_state;
346     f->system_memory = address_space_mem;
347     f->pci_address_space = pci_address_space;
348     f->ram_memory = ram_memory;
349
350     i440fx = I440FX_PCI_HOST_BRIDGE(dev);
351     range_set_bounds(&i440fx->pci_hole, below_4g_mem_size,
352                      IO_APIC_DEFAULT_ADDRESS - 1);
353
354     /* setup pci memory mapping */
355     pc_pci_as_mapping_init(OBJECT(f), f->system_memory,
356                            f->pci_address_space);
357
358     /* if *disabled* show SMRAM to all CPUs */
359     memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region",
360                              f->pci_address_space, 0xa0000, 0x20000);
361     memory_region_add_subregion_overlap(f->system_memory, 0xa0000,
362                                         &f->smram_region, 1);
363     memory_region_set_enabled(&f->smram_region, true);
364
365     /* smram, as seen by SMM CPUs */
366     memory_region_init(&f->smram, OBJECT(d), "smram", 1ull << 32);
367     memory_region_set_enabled(&f->smram, true);
368     memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low",
369                              f->ram_memory, 0xa0000, 0x20000);
370     memory_region_set_enabled(&f->low_smram, true);
371     memory_region_add_subregion(&f->smram, 0xa0000, &f->low_smram);
372     object_property_add_const_link(qdev_get_machine(), "smram",
373                                    OBJECT(&f->smram), &error_abort);
374
375     init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
376              &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
377     for (i = 0; i < 12; ++i) {
378         init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
379                  &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
380                  PAM_EXPAN_SIZE);
381     }
382
383     /* Xen supports additional interrupt routes from the PCI devices to
384      * the IOAPIC: the four pins of each PCI device on the bus are also
385      * connected to the IOAPIC directly.
386      * These additional routes can be discovered through ACPI. */
387     if (xen_enabled()) {
388         PCIDevice *pci_dev = pci_create_simple_multifunction(b,
389                              -1, true, "PIIX3-xen");
390         piix3 = PIIX3_PCI_DEVICE(pci_dev);
391         pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,
392                 piix3, XEN_PIIX_NUM_PIRQS);
393     } else {
394         PCIDevice *pci_dev = pci_create_simple_multifunction(b,
395                              -1, true, "PIIX3");
396         piix3 = PIIX3_PCI_DEVICE(pci_dev);
397         pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3,
398                 PIIX_NUM_PIRQS);
399         pci_bus_set_route_irq_fn(b, piix3_route_intx_pin_to_irq);
400     }
401     piix3->pic = pic;
402     *isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
403
404     *piix3_devfn = piix3->dev.devfn;
405
406     ram_size = ram_size / 8 / 1024 / 1024;
407     if (ram_size > 255) {
408         ram_size = 255;
409     }
410     d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size;
411
412     i440fx_update_memory_mappings(f);
413
414     return b;
415 }
416
417 PCIBus *find_i440fx(void)
418 {
419     PCIHostState *s = OBJECT_CHECK(PCIHostState,
420                                    object_resolve_path("/machine/i440fx", NULL),
421                                    TYPE_PCI_HOST_BRIDGE);
422     return s ? s->bus : NULL;
423 }
424
425 /* PIIX3 PCI to ISA bridge */
426 static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq)
427 {
428     qemu_set_irq(piix3->pic[pic_irq],
429                  !!(piix3->pic_levels &
430                     (((1ULL << PIIX_NUM_PIRQS) - 1) <<
431                      (pic_irq * PIIX_NUM_PIRQS))));
432 }
433
434 static void piix3_set_irq_level_internal(PIIX3State *piix3, int pirq, int level)
435 {
436     int pic_irq;
437     uint64_t mask;
438
439     pic_irq = piix3->dev.config[PIIX_PIRQC + pirq];
440     if (pic_irq >= PIIX_NUM_PIC_IRQS) {
441         return;
442     }
443
444     mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq);
445     piix3->pic_levels &= ~mask;
446     piix3->pic_levels |= mask * !!level;
447 }
448
449 static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level)
450 {
451     int pic_irq;
452
453     pic_irq = piix3->dev.config[PIIX_PIRQC + pirq];
454     if (pic_irq >= PIIX_NUM_PIC_IRQS) {
455         return;
456     }
457
458     piix3_set_irq_level_internal(piix3, pirq, level);
459
460     piix3_set_irq_pic(piix3, pic_irq);
461 }
462
463 static void piix3_set_irq(void *opaque, int pirq, int level)
464 {
465     PIIX3State *piix3 = opaque;
466     piix3_set_irq_level(piix3, pirq, level);
467 }
468
469 static PCIINTxRoute piix3_route_intx_pin_to_irq(void *opaque, int pin)
470 {
471     PIIX3State *piix3 = opaque;
472     int irq = piix3->dev.config[PIIX_PIRQC + pin];
473     PCIINTxRoute route;
474
475     if (irq < PIIX_NUM_PIC_IRQS) {
476         route.mode = PCI_INTX_ENABLED;
477         route.irq = irq;
478     } else {
479         route.mode = PCI_INTX_DISABLED;
480         route.irq = -1;
481     }
482     return route;
483 }
484
485 /* irq routing is changed. so rebuild bitmap */
486 static void piix3_update_irq_levels(PIIX3State *piix3)
487 {
488     int pirq;
489
490     piix3->pic_levels = 0;
491     for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
492         piix3_set_irq_level(piix3, pirq,
493                             pci_bus_get_irq_level(piix3->dev.bus, pirq));
494     }
495 }
496
497 static void piix3_write_config(PCIDevice *dev,
498                                uint32_t address, uint32_t val, int len)
499 {
500     pci_default_write_config(dev, address, val, len);
501     if (ranges_overlap(address, len, PIIX_PIRQC, 4)) {
502         PIIX3State *piix3 = PIIX3_PCI_DEVICE(dev);
503         int pic_irq;
504
505         pci_bus_fire_intx_routing_notifier(piix3->dev.bus);
506         piix3_update_irq_levels(piix3);
507         for (pic_irq = 0; pic_irq < PIIX_NUM_PIC_IRQS; pic_irq++) {
508             piix3_set_irq_pic(piix3, pic_irq);
509         }
510     }
511 }
512
513 static void piix3_write_config_xen(PCIDevice *dev,
514                                uint32_t address, uint32_t val, int len)
515 {
516     xen_piix_pci_write_config_client(address, val, len);
517     piix3_write_config(dev, address, val, len);
518 }
519
520 static void piix3_reset(void *opaque)
521 {
522     PIIX3State *d = opaque;
523     uint8_t *pci_conf = d->dev.config;
524
525     pci_conf[0x04] = 0x07; /* master, memory and I/O */
526     pci_conf[0x05] = 0x00;
527     pci_conf[0x06] = 0x00;
528     pci_conf[0x07] = 0x02; /* PCI_status_devsel_medium */
529     pci_conf[0x4c] = 0x4d;
530     pci_conf[0x4e] = 0x03;
531     pci_conf[0x4f] = 0x00;
532     pci_conf[0x60] = 0x80;
533     pci_conf[0x61] = 0x80;
534     pci_conf[0x62] = 0x80;
535     pci_conf[0x63] = 0x80;
536     pci_conf[0x69] = 0x02;
537     pci_conf[0x70] = 0x80;
538     pci_conf[0x76] = 0x0c;
539     pci_conf[0x77] = 0x0c;
540     pci_conf[0x78] = 0x02;
541     pci_conf[0x79] = 0x00;
542     pci_conf[0x80] = 0x00;
543     pci_conf[0x82] = 0x00;
544     pci_conf[0xa0] = 0x08;
545     pci_conf[0xa2] = 0x00;
546     pci_conf[0xa3] = 0x00;
547     pci_conf[0xa4] = 0x00;
548     pci_conf[0xa5] = 0x00;
549     pci_conf[0xa6] = 0x00;
550     pci_conf[0xa7] = 0x00;
551     pci_conf[0xa8] = 0x0f;
552     pci_conf[0xaa] = 0x00;
553     pci_conf[0xab] = 0x00;
554     pci_conf[0xac] = 0x00;
555     pci_conf[0xae] = 0x00;
556
557     d->pic_levels = 0;
558     d->rcr = 0;
559 }
560
561 static int piix3_post_load(void *opaque, int version_id)
562 {
563     PIIX3State *piix3 = opaque;
564     int pirq;
565
566     /* Because the i8259 has not been deserialized yet, qemu_irq_raise
567      * might bring the system to a different state than the saved one;
568      * for example, the interrupt could be masked but the i8259 would
569      * not know that yet and would trigger an interrupt in the CPU.
570      *
571      * Here, we update irq levels without raising the interrupt.
572      * Interrupt state will be deserialized separately through the i8259.
573      */
574     piix3->pic_levels = 0;
575     for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
576         piix3_set_irq_level_internal(piix3, pirq,
577                             pci_bus_get_irq_level(piix3->dev.bus, pirq));
578     }
579     return 0;
580 }
581
582 static void piix3_pre_save(void *opaque)
583 {
584     int i;
585     PIIX3State *piix3 = opaque;
586
587     for (i = 0; i < ARRAY_SIZE(piix3->pci_irq_levels_vmstate); i++) {
588         piix3->pci_irq_levels_vmstate[i] =
589             pci_bus_get_irq_level(piix3->dev.bus, i);
590     }
591 }
592
593 static bool piix3_rcr_needed(void *opaque)
594 {
595     PIIX3State *piix3 = opaque;
596
597     return (piix3->rcr != 0);
598 }
599
600 static const VMStateDescription vmstate_piix3_rcr = {
601     .name = "PIIX3/rcr",
602     .version_id = 1,
603     .minimum_version_id = 1,
604     .needed = piix3_rcr_needed,
605     .fields = (VMStateField[]) {
606         VMSTATE_UINT8(rcr, PIIX3State),
607         VMSTATE_END_OF_LIST()
608     }
609 };
610
611 static const VMStateDescription vmstate_piix3 = {
612     .name = "PIIX3",
613     .version_id = 3,
614     .minimum_version_id = 2,
615     .post_load = piix3_post_load,
616     .pre_save = piix3_pre_save,
617     .fields = (VMStateField[]) {
618         VMSTATE_PCI_DEVICE(dev, PIIX3State),
619         VMSTATE_INT32_ARRAY_V(pci_irq_levels_vmstate, PIIX3State,
620                               PIIX_NUM_PIRQS, 3),
621         VMSTATE_END_OF_LIST()
622     },
623     .subsections = (const VMStateDescription*[]) {
624         &vmstate_piix3_rcr,
625         NULL
626     }
627 };
628
629
630 static void rcr_write(void *opaque, hwaddr addr, uint64_t val, unsigned len)
631 {
632     PIIX3State *d = opaque;
633
634     if (val & 4) {
635         qemu_system_reset_request();
636         return;
637     }
638     d->rcr = val & 2; /* keep System Reset type only */
639 }
640
641 static uint64_t rcr_read(void *opaque, hwaddr addr, unsigned len)
642 {
643     PIIX3State *d = opaque;
644
645     return d->rcr;
646 }
647
648 static const MemoryRegionOps rcr_ops = {
649     .read = rcr_read,
650     .write = rcr_write,
651     .endianness = DEVICE_LITTLE_ENDIAN
652 };
653
654 static void piix3_realize(PCIDevice *dev, Error **errp)
655 {
656     PIIX3State *d = PIIX3_PCI_DEVICE(dev);
657
658     if (!isa_bus_new(DEVICE(d), get_system_memory(),
659                      pci_address_space_io(dev), errp)) {
660         return;
661     }
662
663     memory_region_init_io(&d->rcr_mem, OBJECT(dev), &rcr_ops, d,
664                           "piix3-reset-control", 1);
665     memory_region_add_subregion_overlap(pci_address_space_io(dev), RCR_IOPORT,
666                                         &d->rcr_mem, 1);
667
668     qemu_register_reset(piix3_reset, d);
669 }
670
671 static void pci_piix3_class_init(ObjectClass *klass, void *data)
672 {
673     DeviceClass *dc = DEVICE_CLASS(klass);
674     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
675
676     dc->desc        = "ISA bridge";
677     dc->vmsd        = &vmstate_piix3;
678     dc->hotpluggable   = false;
679     k->realize      = piix3_realize;
680     k->vendor_id    = PCI_VENDOR_ID_INTEL;
681     /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
682     k->device_id    = PCI_DEVICE_ID_INTEL_82371SB_0;
683     k->class_id     = PCI_CLASS_BRIDGE_ISA;
684     /*
685      * Reason: part of PIIX3 southbridge, needs to be wired up by
686      * pc_piix.c's pc_init1()
687      */
688     dc->user_creatable = false;
689 }
690
691 static const TypeInfo piix3_pci_type_info = {
692     .name = TYPE_PIIX3_PCI_DEVICE,
693     .parent = TYPE_PCI_DEVICE,
694     .instance_size = sizeof(PIIX3State),
695     .abstract = true,
696     .class_init = pci_piix3_class_init,
697 };
698
699 static void piix3_class_init(ObjectClass *klass, void *data)
700 {
701     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
702
703     k->config_write = piix3_write_config;
704 }
705
706 static const TypeInfo piix3_info = {
707     .name          = "PIIX3",
708     .parent        = TYPE_PIIX3_PCI_DEVICE,
709     .class_init    = piix3_class_init,
710 };
711
712 static void piix3_xen_class_init(ObjectClass *klass, void *data)
713 {
714     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
715
716     k->config_write = piix3_write_config_xen;
717 };
718
719 static const TypeInfo piix3_xen_info = {
720     .name          = "PIIX3-xen",
721     .parent        = TYPE_PIIX3_PCI_DEVICE,
722     .class_init    = piix3_xen_class_init,
723 };
724
725 static void i440fx_class_init(ObjectClass *klass, void *data)
726 {
727     DeviceClass *dc = DEVICE_CLASS(klass);
728     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
729
730     k->realize = i440fx_realize;
731     k->config_write = i440fx_write_config;
732     k->vendor_id = PCI_VENDOR_ID_INTEL;
733     k->device_id = PCI_DEVICE_ID_INTEL_82441;
734     k->revision = 0x02;
735     k->class_id = PCI_CLASS_BRIDGE_HOST;
736     dc->desc = "Host bridge";
737     dc->vmsd = &vmstate_i440fx;
738     /*
739      * PCI-facing part of the host bridge, not usable without the
740      * host-facing part, which can't be device_add'ed, yet.
741      */
742     dc->user_creatable = false;
743     dc->hotpluggable   = false;
744 }
745
746 static const TypeInfo i440fx_info = {
747     .name          = TYPE_I440FX_PCI_DEVICE,
748     .parent        = TYPE_PCI_DEVICE,
749     .instance_size = sizeof(PCII440FXState),
750     .class_init    = i440fx_class_init,
751 };
752
753 /* IGD Passthrough Host Bridge. */
754 typedef struct {
755     uint8_t offset;
756     uint8_t len;
757 } IGDHostInfo;
758
759 /* Here we just expose minimal host bridge offset subset. */
760 static const IGDHostInfo igd_host_bridge_infos[] = {
761     {0x08, 2},  /* revision id */
762     {0x2c, 2},  /* sybsystem vendor id */
763     {0x2e, 2},  /* sybsystem id */
764     {0x50, 2},  /* SNB: processor graphics control register */
765     {0x52, 2},  /* processor graphics control register */
766     {0xa4, 4},  /* SNB: graphics base of stolen memory */
767     {0xa8, 4},  /* SNB: base of GTT stolen memory */
768 };
769
770 static int host_pci_config_read(int pos, int len, uint32_t *val)
771 {
772     char path[PATH_MAX];
773     int config_fd;
774     ssize_t size = sizeof(path);
775     /* Access real host bridge. */
776     int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
777                       0, 0, 0, 0, "config");
778     int ret = 0;
779
780     if (rc >= size || rc < 0) {
781         return -ENODEV;
782     }
783
784     config_fd = open(path, O_RDWR);
785     if (config_fd < 0) {
786         return -ENODEV;
787     }
788
789     if (lseek(config_fd, pos, SEEK_SET) != pos) {
790         ret = -errno;
791         goto out;
792     }
793
794     do {
795         rc = read(config_fd, (uint8_t *)val, len);
796     } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
797     if (rc != len) {
798         ret = -errno;
799     }
800
801 out:
802     close(config_fd);
803     return ret;
804 }
805
806 static int igd_pt_i440fx_initfn(struct PCIDevice *pci_dev)
807 {
808     uint32_t val = 0;
809     int rc, i, num;
810     int pos, len;
811
812     num = ARRAY_SIZE(igd_host_bridge_infos);
813     for (i = 0; i < num; i++) {
814         pos = igd_host_bridge_infos[i].offset;
815         len = igd_host_bridge_infos[i].len;
816         rc = host_pci_config_read(pos, len, &val);
817         if (rc) {
818             return -ENODEV;
819         }
820         pci_default_write_config(pci_dev, pos, val, len);
821     }
822
823     return 0;
824 }
825
826 static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
827 {
828     DeviceClass *dc = DEVICE_CLASS(klass);
829     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
830
831     k->init = igd_pt_i440fx_initfn;
832     dc->desc = "IGD Passthrough Host bridge";
833 }
834
835 static const TypeInfo igd_passthrough_i440fx_info = {
836     .name          = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
837     .parent        = TYPE_I440FX_PCI_DEVICE,
838     .instance_size = sizeof(PCII440FXState),
839     .class_init    = igd_passthrough_i440fx_class_init,
840 };
841
842 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
843                                                 PCIBus *rootbus)
844 {
845     I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge);
846
847     /* For backwards compat with old device paths */
848     if (s->short_root_bus) {
849         return "0000";
850     }
851     return "0000:00";
852 }
853
854 static Property i440fx_props[] = {
855     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState,
856                      pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),
857     DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0),
858     DEFINE_PROP_END_OF_LIST(),
859 };
860
861 static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
862 {
863     DeviceClass *dc = DEVICE_CLASS(klass);
864     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
865
866     hc->root_bus_path = i440fx_pcihost_root_bus_path;
867     dc->realize = i440fx_pcihost_realize;
868     dc->fw_name = "pci";
869     dc->props = i440fx_props;
870     /* Reason: needs to be wired up by pc_init1 */
871     dc->user_creatable = false;
872 }
873
874 static const TypeInfo i440fx_pcihost_info = {
875     .name          = TYPE_I440FX_PCI_HOST_BRIDGE,
876     .parent        = TYPE_PCI_HOST_BRIDGE,
877     .instance_size = sizeof(I440FXState),
878     .instance_init = i440fx_pcihost_initfn,
879     .class_init    = i440fx_pcihost_class_init,
880 };
881
882 static void i440fx_register_types(void)
883 {
884     type_register_static(&i440fx_info);
885     type_register_static(&igd_passthrough_i440fx_info);
886     type_register_static(&piix3_pci_type_info);
887     type_register_static(&piix3_info);
888     type_register_static(&piix3_xen_info);
889     type_register_static(&i440fx_pcihost_info);
890 }
891
892 type_init(i440fx_register_types)
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