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1 /*
2  * QEMU PIIX4 PCI Bridge Emulation
3  *
4  * Copyright (c) 2006 Fabrice Bellard
5  * Copyright (c) 2018 HervĂ© Poussineau
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a copy
8  * of this software and associated documentation files (the "Software"), to deal
9  * in the Software without restriction, including without limitation the rights
10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11  * copies of the Software, and to permit persons to whom the Software is
12  * furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in
15  * all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23  * THE SOFTWARE.
24  */
25
26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "hw/irq.h"
29 #include "hw/i386/pc.h"
30 #include "hw/southbridge/piix.h"
31 #include "hw/pci/pci.h"
32 #include "hw/isa/isa.h"
33 #include "hw/sysbus.h"
34 #include "hw/dma/i8257.h"
35 #include "hw/timer/i8254.h"
36 #include "hw/rtc/mc146818rtc.h"
37 #include "hw/ide.h"
38 #include "migration/vmstate.h"
39 #include "sysemu/reset.h"
40 #include "sysemu/runstate.h"
41
42 PCIDevice *piix4_dev;
43
44 typedef struct PIIX4State {
45     PCIDevice dev;
46     qemu_irq cpu_intr;
47     qemu_irq *isa;
48
49     RTCState rtc;
50     /* Reset Control Register */
51     MemoryRegion rcr_mem;
52     uint8_t rcr;
53 } PIIX4State;
54
55 #define PIIX4_PCI_DEVICE(obj) \
56     OBJECT_CHECK(PIIX4State, (obj), TYPE_PIIX4_PCI_DEVICE)
57
58 static void piix4_isa_reset(DeviceState *dev)
59 {
60     PIIX4State *d = PIIX4_PCI_DEVICE(dev);
61     uint8_t *pci_conf = d->dev.config;
62
63     pci_conf[0x04] = 0x07; // master, memory and I/O
64     pci_conf[0x05] = 0x00;
65     pci_conf[0x06] = 0x00;
66     pci_conf[0x07] = 0x02; // PCI_status_devsel_medium
67     pci_conf[0x4c] = 0x4d;
68     pci_conf[0x4e] = 0x03;
69     pci_conf[0x4f] = 0x00;
70     pci_conf[0x60] = 0x0a; // PCI A -> IRQ 10
71     pci_conf[0x61] = 0x0a; // PCI B -> IRQ 10
72     pci_conf[0x62] = 0x0b; // PCI C -> IRQ 11
73     pci_conf[0x63] = 0x0b; // PCI D -> IRQ 11
74     pci_conf[0x69] = 0x02;
75     pci_conf[0x70] = 0x80;
76     pci_conf[0x76] = 0x0c;
77     pci_conf[0x77] = 0x0c;
78     pci_conf[0x78] = 0x02;
79     pci_conf[0x79] = 0x00;
80     pci_conf[0x80] = 0x00;
81     pci_conf[0x82] = 0x00;
82     pci_conf[0xa0] = 0x08;
83     pci_conf[0xa2] = 0x00;
84     pci_conf[0xa3] = 0x00;
85     pci_conf[0xa4] = 0x00;
86     pci_conf[0xa5] = 0x00;
87     pci_conf[0xa6] = 0x00;
88     pci_conf[0xa7] = 0x00;
89     pci_conf[0xa8] = 0x0f;
90     pci_conf[0xaa] = 0x00;
91     pci_conf[0xab] = 0x00;
92     pci_conf[0xac] = 0x00;
93     pci_conf[0xae] = 0x00;
94 }
95
96 static const VMStateDescription vmstate_piix4 = {
97     .name = "PIIX4",
98     .version_id = 2,
99     .minimum_version_id = 2,
100     .fields = (VMStateField[]) {
101         VMSTATE_PCI_DEVICE(dev, PIIX4State),
102         VMSTATE_END_OF_LIST()
103     }
104 };
105
106 static void piix4_request_i8259_irq(void *opaque, int irq, int level)
107 {
108     PIIX4State *s = opaque;
109     qemu_set_irq(s->cpu_intr, level);
110 }
111
112 static void piix4_set_i8259_irq(void *opaque, int irq, int level)
113 {
114     PIIX4State *s = opaque;
115     qemu_set_irq(s->isa[irq], level);
116 }
117
118 static void piix4_rcr_write(void *opaque, hwaddr addr, uint64_t val,
119                             unsigned int len)
120 {
121     PIIX4State *s = opaque;
122
123     if (val & 4) {
124         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
125         return;
126     }
127
128     s->rcr = val & 2; /* keep System Reset type only */
129 }
130
131 static uint64_t piix4_rcr_read(void *opaque, hwaddr addr, unsigned int len)
132 {
133     PIIX4State *s = opaque;
134
135     return s->rcr;
136 }
137
138 static const MemoryRegionOps piix4_rcr_ops = {
139     .read = piix4_rcr_read,
140     .write = piix4_rcr_write,
141     .endianness = DEVICE_LITTLE_ENDIAN,
142     .impl = {
143         .min_access_size = 1,
144         .max_access_size = 1,
145     },
146 };
147
148 static void piix4_realize(PCIDevice *dev, Error **errp)
149 {
150     PIIX4State *s = PIIX4_PCI_DEVICE(dev);
151     ISABus *isa_bus;
152     qemu_irq *i8259_out_irq;
153     Error *err = NULL;
154
155     isa_bus = isa_bus_new(DEVICE(dev), pci_address_space(dev),
156                           pci_address_space_io(dev), errp);
157     if (!isa_bus) {
158         return;
159     }
160
161     qdev_init_gpio_in_named(DEVICE(dev), piix4_set_i8259_irq,
162                             "isa", ISA_NUM_IRQS);
163     qdev_init_gpio_out_named(DEVICE(dev), &s->cpu_intr,
164                              "intr", 1);
165
166     memory_region_init_io(&s->rcr_mem, OBJECT(dev), &piix4_rcr_ops, s,
167                           "reset-control", 1);
168     memory_region_add_subregion_overlap(pci_address_space_io(dev),
169                                         PIIX_RCR_IOPORT, &s->rcr_mem, 1);
170
171     /* initialize i8259 pic */
172     i8259_out_irq = qemu_allocate_irqs(piix4_request_i8259_irq, s, 1);
173     s->isa = i8259_init(isa_bus, *i8259_out_irq);
174
175     /* initialize ISA irqs */
176     isa_bus_irqs(isa_bus, s->isa);
177
178     /* initialize pit */
179     i8254_pit_init(isa_bus, 0x40, 0, NULL);
180
181     /* DMA */
182     i8257_dma_init(isa_bus, 0);
183
184     /* RTC */
185     qdev_set_parent_bus(DEVICE(&s->rtc), BUS(isa_bus));
186     qdev_prop_set_int32(DEVICE(&s->rtc), "base_year", 2000);
187     object_property_set_bool(OBJECT(&s->rtc), true, "realized", &err);
188     if (err) {
189         error_propagate(errp, err);
190         return;
191     }
192     isa_init_irq(ISA_DEVICE(&s->rtc), &s->rtc.irq, RTC_ISA_IRQ);
193
194     piix4_dev = dev;
195 }
196
197 static void piix4_init(Object *obj)
198 {
199     PIIX4State *s = PIIX4_PCI_DEVICE(obj);
200
201     object_initialize(&s->rtc, sizeof(s->rtc), TYPE_MC146818_RTC);
202 }
203
204 static void piix4_class_init(ObjectClass *klass, void *data)
205 {
206     DeviceClass *dc = DEVICE_CLASS(klass);
207     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
208
209     k->realize = piix4_realize;
210     k->vendor_id = PCI_VENDOR_ID_INTEL;
211     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;
212     k->class_id = PCI_CLASS_BRIDGE_ISA;
213     dc->reset = piix4_isa_reset;
214     dc->desc = "ISA bridge";
215     dc->vmsd = &vmstate_piix4;
216     /*
217      * Reason: part of PIIX4 southbridge, needs to be wired up,
218      * e.g. by mips_malta_init()
219      */
220     dc->user_creatable = false;
221     dc->hotpluggable = false;
222 }
223
224 static const TypeInfo piix4_info = {
225     .name          = TYPE_PIIX4_PCI_DEVICE,
226     .parent        = TYPE_PCI_DEVICE,
227     .instance_size = sizeof(PIIX4State),
228     .instance_init = piix4_init,
229     .class_init    = piix4_class_init,
230     .interfaces = (InterfaceInfo[]) {
231         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
232         { },
233     },
234 };
235
236 static void piix4_register_types(void)
237 {
238     type_register_static(&piix4_info);
239 }
240
241 type_init(piix4_register_types)
242
243 DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus,
244                           I2CBus **smbus, size_t ide_buses)
245 {
246     size_t ide_drives = ide_buses * MAX_IDE_DEVS;
247     DriveInfo **hd;
248     PCIDevice *pci;
249     DeviceState *dev;
250
251     pci = pci_create_simple_multifunction(pci_bus, PCI_DEVFN(10, 0),
252                                           true, TYPE_PIIX4_PCI_DEVICE);
253     dev = DEVICE(pci);
254     if (isa_bus) {
255         *isa_bus = ISA_BUS(qdev_get_child_bus(dev, "isa.0"));
256     }
257
258     hd = g_new(DriveInfo *, ide_drives);
259     ide_drive_get(hd, ide_drives);
260     pci_piix4_ide_init(pci_bus, hd, pci->devfn + 1);
261     g_free(hd);
262     pci_create_simple(pci_bus, pci->devfn + 2, "piix4-usb-uhci");
263     if (smbus) {
264         *smbus = piix4_pm_init(pci_bus, pci->devfn + 3, 0x1100,
265                                isa_get_irq(NULL, 9), NULL, 0, NULL);
266    }
267
268     return dev;
269 }
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