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ppc: convert to memory API
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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 "hw.h"
26 #include "pc.h"
27 #include "pci.h"
28 #include "pci_host.h"
29 #include "isa.h"
30 #include "sysbus.h"
31 #include "range.h"
32 #include "xen.h"
33
34 /*
35  * I440FX chipset data sheet.
36  * http://download.intel.com/design/chipsets/datashts/29054901.pdf
37  */
38
39 typedef PCIHostState I440FXState;
40
41 #define PIIX_NUM_PIC_IRQS       16      /* i8259 * 2 */
42 #define PIIX_NUM_PIRQS          4ULL    /* PIRQ[A-D] */
43 #define XEN_PIIX_NUM_PIRQS      128ULL
44 #define PIIX_PIRQC              0x60
45
46 typedef struct PIIX3State {
47     PCIDevice dev;
48
49     /*
50      * bitmap to track pic levels.
51      * The pic level is the logical OR of all the PCI irqs mapped to it
52      * So one PIC level is tracked by PIIX_NUM_PIRQS bits.
53      *
54      * PIRQ is mapped to PIC pins, we track it by
55      * PIIX_NUM_PIRQS * PIIX_NUM_PIC_IRQS = 64 bits with
56      * pic_irq * PIIX_NUM_PIRQS + pirq
57      */
58 #if PIIX_NUM_PIC_IRQS * PIIX_NUM_PIRQS > 64
59 #error "unable to encode pic state in 64bit in pic_levels."
60 #endif
61     uint64_t pic_levels;
62
63     qemu_irq *pic;
64
65     /* This member isn't used. Just for save/load compatibility */
66     int32_t pci_irq_levels_vmstate[PIIX_NUM_PIRQS];
67 } PIIX3State;
68
69 struct PCII440FXState {
70     PCIDevice dev;
71     target_phys_addr_t isa_page_descs[384 / 4];
72     uint8_t smm_enabled;
73     PIIX3State *piix3;
74 };
75
76
77 #define I440FX_PAM      0x59
78 #define I440FX_PAM_SIZE 7
79 #define I440FX_SMRAM    0x72
80
81 static void piix3_set_irq(void *opaque, int pirq, int level);
82 static void piix3_write_config_xen(PCIDevice *dev,
83                                uint32_t address, uint32_t val, int len);
84
85 /* return the global irq number corresponding to a given device irq
86    pin. We could also use the bus number to have a more precise
87    mapping. */
88 static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
89 {
90     int slot_addend;
91     slot_addend = (pci_dev->devfn >> 3) - 1;
92     return (pci_intx + slot_addend) & 3;
93 }
94
95 static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r)
96 {
97     uint32_t addr;
98
99     //    printf("ISA mapping %08x-0x%08x: %d\n", start, end, r);
100     switch(r) {
101     case 3:
102         /* RAM */
103         cpu_register_physical_memory(start, end - start,
104                                      start);
105         break;
106     case 1:
107         /* ROM (XXX: not quite correct) */
108         cpu_register_physical_memory(start, end - start,
109                                      start | IO_MEM_ROM);
110         break;
111     case 2:
112     case 0:
113         /* XXX: should distinguish read/write cases */
114         for(addr = start; addr < end; addr += 4096) {
115             cpu_register_physical_memory(addr, 4096,
116                                          d->isa_page_descs[(addr - 0xa0000) >> 12]);
117         }
118         break;
119     }
120 }
121
122 static void i440fx_update_memory_mappings(PCII440FXState *d)
123 {
124     int i, r;
125     uint32_t smram, addr;
126
127     update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3);
128     for(i = 0; i < 12; i++) {
129         r = (d->dev.config[(i >> 1) + (I440FX_PAM + 1)] >> ((i & 1) * 4)) & 3;
130         update_pam(d, 0xc0000 + 0x4000 * i, 0xc0000 + 0x4000 * (i + 1), r);
131     }
132     smram = d->dev.config[I440FX_SMRAM];
133     if ((d->smm_enabled && (smram & 0x08)) || (smram & 0x40)) {
134         cpu_register_physical_memory(0xa0000, 0x20000, 0xa0000);
135     } else {
136         for(addr = 0xa0000; addr < 0xc0000; addr += 4096) {
137             cpu_register_physical_memory(addr, 4096,
138                                          d->isa_page_descs[(addr - 0xa0000) >> 12]);
139         }
140     }
141 }
142
143 static void i440fx_set_smm(int val, void *arg)
144 {
145     PCII440FXState *d = arg;
146
147     val = (val != 0);
148     if (d->smm_enabled != val) {
149         d->smm_enabled = val;
150         i440fx_update_memory_mappings(d);
151     }
152 }
153
154
155 /* XXX: suppress when better memory API. We make the assumption that
156    no device (in particular the VGA) changes the memory mappings in
157    the 0xa0000-0x100000 range */
158 void i440fx_init_memory_mappings(PCII440FXState *d)
159 {
160     int i;
161     for(i = 0; i < 96; i++) {
162         d->isa_page_descs[i] = cpu_get_physical_page_desc(0xa0000 + i * 0x1000);
163     }
164 }
165
166 static void i440fx_write_config(PCIDevice *dev,
167                                 uint32_t address, uint32_t val, int len)
168 {
169     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
170
171     /* XXX: implement SMRAM.D_LOCK */
172     pci_default_write_config(dev, address, val, len);
173     if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
174         range_covers_byte(address, len, I440FX_SMRAM)) {
175         i440fx_update_memory_mappings(d);
176     }
177 }
178
179 static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
180 {
181     PCII440FXState *d = opaque;
182     int ret, i;
183
184     ret = pci_device_load(&d->dev, f);
185     if (ret < 0)
186         return ret;
187     i440fx_update_memory_mappings(d);
188     qemu_get_8s(f, &d->smm_enabled);
189
190     if (version_id == 2) {
191         for (i = 0; i < PIIX_NUM_PIRQS; i++) {
192             qemu_get_be32(f); /* dummy load for compatibility */
193         }
194     }
195
196     return 0;
197 }
198
199 static int i440fx_post_load(void *opaque, int version_id)
200 {
201     PCII440FXState *d = opaque;
202
203     i440fx_update_memory_mappings(d);
204     return 0;
205 }
206
207 static const VMStateDescription vmstate_i440fx = {
208     .name = "I440FX",
209     .version_id = 3,
210     .minimum_version_id = 3,
211     .minimum_version_id_old = 1,
212     .load_state_old = i440fx_load_old,
213     .post_load = i440fx_post_load,
214     .fields      = (VMStateField []) {
215         VMSTATE_PCI_DEVICE(dev, PCII440FXState),
216         VMSTATE_UINT8(smm_enabled, PCII440FXState),
217         VMSTATE_END_OF_LIST()
218     }
219 };
220
221 static int i440fx_pcihost_initfn(SysBusDevice *dev)
222 {
223     I440FXState *s = FROM_SYSBUS(I440FXState, dev);
224
225     pci_host_conf_register_ioport(0xcf8, s);
226
227     pci_host_data_register_ioport(0xcfc, s);
228     return 0;
229 }
230
231 static int i440fx_initfn(PCIDevice *dev)
232 {
233     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
234
235     d->dev.config[I440FX_SMRAM] = 0x02;
236
237     cpu_smm_register(&i440fx_set_smm, d);
238     return 0;
239 }
240
241 static PCIBus *i440fx_common_init(const char *device_name,
242                                   PCII440FXState **pi440fx_state,
243                                   int *piix3_devfn,
244                                   qemu_irq *pic,
245                                   MemoryRegion *address_space_mem,
246                                   MemoryRegion *address_space_io,
247                                   ram_addr_t ram_size)
248 {
249     DeviceState *dev;
250     PCIBus *b;
251     PCIDevice *d;
252     I440FXState *s;
253     PIIX3State *piix3;
254
255     dev = qdev_create(NULL, "i440FX-pcihost");
256     s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));
257     s->address_space = address_space_mem;
258     b = pci_bus_new(&s->busdev.qdev, NULL, s->address_space,
259                     address_space_io, 0);
260     s->bus = b;
261     qdev_init_nofail(dev);
262
263     d = pci_create_simple(b, 0, device_name);
264     *pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);
265
266     /* Xen supports additional interrupt routes from the PCI devices to
267      * the IOAPIC: the four pins of each PCI device on the bus are also
268      * connected to the IOAPIC directly.
269      * These additional routes can be discovered through ACPI. */
270     if (xen_enabled()) {
271         piix3 = DO_UPCAST(PIIX3State, dev,
272                 pci_create_simple_multifunction(b, -1, true, "PIIX3-xen"));
273         pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,
274                 piix3, XEN_PIIX_NUM_PIRQS);
275     } else {
276         piix3 = DO_UPCAST(PIIX3State, dev,
277                 pci_create_simple_multifunction(b, -1, true, "PIIX3"));
278         pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3,
279                 PIIX_NUM_PIRQS);
280     }
281     piix3->pic = pic;
282
283     (*pi440fx_state)->piix3 = piix3;
284
285     *piix3_devfn = piix3->dev.devfn;
286
287     ram_size = ram_size / 8 / 1024 / 1024;
288     if (ram_size > 255)
289         ram_size = 255;
290     (*pi440fx_state)->dev.config[0x57]=ram_size;
291
292     return b;
293 }
294
295 PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn,
296                     qemu_irq *pic,
297                     MemoryRegion *address_space_mem,
298                     MemoryRegion *address_space_io,
299                     ram_addr_t ram_size)
300 {
301     PCIBus *b;
302
303     b = i440fx_common_init("i440FX", pi440fx_state, piix3_devfn, pic,
304                            address_space_mem, address_space_io, ram_size);
305     return b;
306 }
307
308 /* PIIX3 PCI to ISA bridge */
309 static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq)
310 {
311     qemu_set_irq(piix3->pic[pic_irq],
312                  !!(piix3->pic_levels &
313                     (((1ULL << PIIX_NUM_PIRQS) - 1) <<
314                      (pic_irq * PIIX_NUM_PIRQS))));
315 }
316
317 static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level)
318 {
319     int pic_irq;
320     uint64_t mask;
321
322     pic_irq = piix3->dev.config[PIIX_PIRQC + pirq];
323     if (pic_irq >= PIIX_NUM_PIC_IRQS) {
324         return;
325     }
326
327     mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq);
328     piix3->pic_levels &= ~mask;
329     piix3->pic_levels |= mask * !!level;
330
331     piix3_set_irq_pic(piix3, pic_irq);
332 }
333
334 static void piix3_set_irq(void *opaque, int pirq, int level)
335 {
336     PIIX3State *piix3 = opaque;
337     piix3_set_irq_level(piix3, pirq, level);
338 }
339
340 /* irq routing is changed. so rebuild bitmap */
341 static void piix3_update_irq_levels(PIIX3State *piix3)
342 {
343     int pirq;
344
345     piix3->pic_levels = 0;
346     for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
347         piix3_set_irq_level(piix3, pirq,
348                             pci_bus_get_irq_level(piix3->dev.bus, pirq));
349     }
350 }
351
352 static void piix3_write_config(PCIDevice *dev,
353                                uint32_t address, uint32_t val, int len)
354 {
355     pci_default_write_config(dev, address, val, len);
356     if (ranges_overlap(address, len, PIIX_PIRQC, 4)) {
357         PIIX3State *piix3 = DO_UPCAST(PIIX3State, dev, dev);
358         int pic_irq;
359         piix3_update_irq_levels(piix3);
360         for (pic_irq = 0; pic_irq < PIIX_NUM_PIC_IRQS; pic_irq++) {
361             piix3_set_irq_pic(piix3, pic_irq);
362         }
363     }
364 }
365
366 static void piix3_write_config_xen(PCIDevice *dev,
367                                uint32_t address, uint32_t val, int len)
368 {
369     xen_piix_pci_write_config_client(address, val, len);
370     piix3_write_config(dev, address, val, len);
371 }
372
373 static void piix3_reset(void *opaque)
374 {
375     PIIX3State *d = opaque;
376     uint8_t *pci_conf = d->dev.config;
377
378     pci_conf[0x04] = 0x07; // master, memory and I/O
379     pci_conf[0x05] = 0x00;
380     pci_conf[0x06] = 0x00;
381     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
382     pci_conf[0x4c] = 0x4d;
383     pci_conf[0x4e] = 0x03;
384     pci_conf[0x4f] = 0x00;
385     pci_conf[0x60] = 0x80;
386     pci_conf[0x61] = 0x80;
387     pci_conf[0x62] = 0x80;
388     pci_conf[0x63] = 0x80;
389     pci_conf[0x69] = 0x02;
390     pci_conf[0x70] = 0x80;
391     pci_conf[0x76] = 0x0c;
392     pci_conf[0x77] = 0x0c;
393     pci_conf[0x78] = 0x02;
394     pci_conf[0x79] = 0x00;
395     pci_conf[0x80] = 0x00;
396     pci_conf[0x82] = 0x00;
397     pci_conf[0xa0] = 0x08;
398     pci_conf[0xa2] = 0x00;
399     pci_conf[0xa3] = 0x00;
400     pci_conf[0xa4] = 0x00;
401     pci_conf[0xa5] = 0x00;
402     pci_conf[0xa6] = 0x00;
403     pci_conf[0xa7] = 0x00;
404     pci_conf[0xa8] = 0x0f;
405     pci_conf[0xaa] = 0x00;
406     pci_conf[0xab] = 0x00;
407     pci_conf[0xac] = 0x00;
408     pci_conf[0xae] = 0x00;
409
410     d->pic_levels = 0;
411 }
412
413 static int piix3_post_load(void *opaque, int version_id)
414 {
415     PIIX3State *piix3 = opaque;
416     piix3_update_irq_levels(piix3);
417     return 0;
418 }
419
420 static void piix3_pre_save(void *opaque)
421 {
422     int i;
423     PIIX3State *piix3 = opaque;
424
425     for (i = 0; i < ARRAY_SIZE(piix3->pci_irq_levels_vmstate); i++) {
426         piix3->pci_irq_levels_vmstate[i] =
427             pci_bus_get_irq_level(piix3->dev.bus, i);
428     }
429 }
430
431 static const VMStateDescription vmstate_piix3 = {
432     .name = "PIIX3",
433     .version_id = 3,
434     .minimum_version_id = 2,
435     .minimum_version_id_old = 2,
436     .post_load = piix3_post_load,
437     .pre_save = piix3_pre_save,
438     .fields      = (VMStateField []) {
439         VMSTATE_PCI_DEVICE(dev, PIIX3State),
440         VMSTATE_INT32_ARRAY_V(pci_irq_levels_vmstate, PIIX3State,
441                               PIIX_NUM_PIRQS, 3),
442         VMSTATE_END_OF_LIST()
443     }
444 };
445
446 static int piix3_initfn(PCIDevice *dev)
447 {
448     PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);
449
450     isa_bus_new(&d->dev.qdev);
451     qemu_register_reset(piix3_reset, d);
452     return 0;
453 }
454
455 static PCIDeviceInfo i440fx_info[] = {
456     {
457         .qdev.name    = "i440FX",
458         .qdev.desc    = "Host bridge",
459         .qdev.size    = sizeof(PCII440FXState),
460         .qdev.vmsd    = &vmstate_i440fx,
461         .qdev.no_user = 1,
462         .no_hotplug   = 1,
463         .init         = i440fx_initfn,
464         .config_write = i440fx_write_config,
465         .vendor_id    = PCI_VENDOR_ID_INTEL,
466         .device_id    = PCI_DEVICE_ID_INTEL_82441,
467         .revision     = 0x02,
468         .class_id     = PCI_CLASS_BRIDGE_HOST,
469     },{
470         .qdev.name    = "PIIX3",
471         .qdev.desc    = "ISA bridge",
472         .qdev.size    = sizeof(PIIX3State),
473         .qdev.vmsd    = &vmstate_piix3,
474         .qdev.no_user = 1,
475         .no_hotplug   = 1,
476         .init         = piix3_initfn,
477         .config_write = piix3_write_config,
478         .vendor_id    = PCI_VENDOR_ID_INTEL,
479         .device_id    = PCI_DEVICE_ID_INTEL_82371SB_0, // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
480         .class_id     = PCI_CLASS_BRIDGE_ISA,
481     },{
482         .qdev.name    = "PIIX3-xen",
483         .qdev.desc    = "ISA bridge",
484         .qdev.size    = sizeof(PIIX3State),
485         .qdev.vmsd    = &vmstate_piix3,
486         .qdev.no_user = 1,
487         .no_hotplug   = 1,
488         .init         = piix3_initfn,
489         .config_write = piix3_write_config_xen,
490         .vendor_id    = PCI_VENDOR_ID_INTEL,
491         .device_id    = PCI_DEVICE_ID_INTEL_82371SB_0, // 82371SB PIIX3 PCI-to-ISA bridge (Step A1)
492         .class_id     = PCI_CLASS_BRIDGE_ISA,
493     },{
494         /* end of list */
495     }
496 };
497
498 static SysBusDeviceInfo i440fx_pcihost_info = {
499     .init         = i440fx_pcihost_initfn,
500     .qdev.name    = "i440FX-pcihost",
501     .qdev.fw_name = "pci",
502     .qdev.size    = sizeof(I440FXState),
503     .qdev.no_user = 1,
504 };
505
506 static void i440fx_register(void)
507 {
508     sysbus_register_withprop(&i440fx_pcihost_info);
509     pci_qdev_register_many(i440fx_info);
510 }
511 device_init(i440fx_register);
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