hw/intc/i8259_common.c

   1 /*
   2  * QEMU 8259 - common bits of emulated and KVM kernel model
   3  *
   4  * Copyright (c) 2003-2004 Fabrice Bellard
   5  * Copyright (c) 2011      Jan Kiszka, Siemens AG
   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 "hw/intc/i8259.h"
  28 #include "hw/isa/i8259_internal.h"
  29 #include "hw/qdev-properties.h"
  30 #include "migration/vmstate.h"
  31 #include "monitor/monitor.h"
  32
  33 static int irq_level[16];
  34 static uint64_t irq_count[16];
  35
  36 void pic_reset_common(PICCommonState *s)
  37 {
  38     s->last_irr = 0;
  39     s->irr &= s->elcr;
  40     s->imr = 0;
  41     s->isr = 0;
  42     s->priority_add = 0;
  43     s->irq_base = 0;
  44     s->read_reg_select = 0;
  45     s->poll = 0;
  46     s->special_mask = 0;
  47     s->init_state = 0;
  48     s->auto_eoi = 0;
  49     s->rotate_on_auto_eoi = 0;
  50     s->special_fully_nested_mode = 0;
  51     s->init4 = 0;
  52     s->single_mode = 0;
  53     /* Note: ELCR is not reset */
  54 }
  55
  56 static int pic_dispatch_pre_save(void *opaque)
  57 {
  58     PICCommonState *s = opaque;
  59     PICCommonClass *info = PIC_COMMON_GET_CLASS(s);
  60
  61     if (info->pre_save) {
  62         info->pre_save(s);
  63     }
  64
  65     return 0;
  66 }
  67
  68 static int pic_dispatch_post_load(void *opaque, int version_id)
  69 {
  70     PICCommonState *s = opaque;
  71     PICCommonClass *info = PIC_COMMON_GET_CLASS(s);
  72
  73     if (info->post_load) {
  74         info->post_load(s);
  75     }
  76     return 0;
  77 }
  78
  79 static void pic_common_realize(DeviceState *dev, Error **errp)
  80 {
  81     PICCommonState *s = PIC_COMMON(dev);
  82     ISADevice *isa = ISA_DEVICE(dev);
  83
  84     isa_register_ioport(isa, &s->base_io, s->iobase);
  85     if (s->elcr_addr != -1) {
  86         isa_register_ioport(isa, &s->elcr_io, s->elcr_addr);
  87     }
  88
  89     qdev_set_legacy_instance_id(dev, s->iobase, 1);
  90 }
  91
  92 ISADevice *i8259_init_chip(const char *name, ISABus *bus, bool master)
  93 {
  94     DeviceState *dev;
  95     ISADevice *isadev;
  96
  97     isadev = isa_create(bus, name);
  98     dev = DEVICE(isadev);
  99     qdev_prop_set_uint32(dev, "iobase", master ? 0x20 : 0xa0);
 100     qdev_prop_set_uint32(dev, "elcr_addr", master ? 0x4d0 : 0x4d1);
 101     qdev_prop_set_uint8(dev, "elcr_mask", master ? 0xf8 : 0xde);
 102     qdev_prop_set_bit(dev, "master", master);
 103     qdev_init_nofail(dev);
 104
 105     return isadev;
 106 }
 107
 108 void pic_stat_update_irq(int irq, int level)
 109 {
 110     if (level != irq_level[irq]) {
 111         irq_level[irq] = level;
 112         if (level == 1) {
 113             irq_count[irq]++;
 114         }
 115     }
 116 }
 117
 118 bool pic_get_statistics(InterruptStatsProvider *obj,
 119                         uint64_t **irq_counts, unsigned int *nb_irqs)
 120 {
 121     PICCommonState *s = PIC_COMMON(obj);
 122
 123     if (s->master) {
 124         *irq_counts = irq_count;
 125         *nb_irqs = ARRAY_SIZE(irq_count);
 126     } else {
 127         *irq_counts = NULL;
 128         *nb_irqs = 0;
 129     }
 130
 131     return true;
 132 }
 133
 134 void pic_print_info(InterruptStatsProvider *obj, Monitor *mon)
 135 {
 136     PICCommonState *s = PIC_COMMON(obj);
 137
 138     pic_dispatch_pre_save(s);
 139     monitor_printf(mon, "pic%d: irr=%02x imr=%02x isr=%02x hprio=%d "
 140                    "irq_base=%02x rr_sel=%d elcr=%02x fnm=%d\n",
 141                    s->master ? 0 : 1, s->irr, s->imr, s->isr, s->priority_add,
 142                    s->irq_base, s->read_reg_select, s->elcr,
 143                    s->special_fully_nested_mode);
 144 }
 145
 146 static const VMStateDescription vmstate_pic_common = {
 147     .name = "i8259",
 148     .version_id = 1,
 149     .minimum_version_id = 1,
 150     .pre_save = pic_dispatch_pre_save,
 151     .post_load = pic_dispatch_post_load,
 152     .fields = (VMStateField[]) {
 153         VMSTATE_UINT8(last_irr, PICCommonState),
 154         VMSTATE_UINT8(irr, PICCommonState),
 155         VMSTATE_UINT8(imr, PICCommonState),
 156         VMSTATE_UINT8(isr, PICCommonState),
 157         VMSTATE_UINT8(priority_add, PICCommonState),
 158         VMSTATE_UINT8(irq_base, PICCommonState),
 159         VMSTATE_UINT8(read_reg_select, PICCommonState),
 160         VMSTATE_UINT8(poll, PICCommonState),
 161         VMSTATE_UINT8(special_mask, PICCommonState),
 162         VMSTATE_UINT8(init_state, PICCommonState),
 163         VMSTATE_UINT8(auto_eoi, PICCommonState),
 164         VMSTATE_UINT8(rotate_on_auto_eoi, PICCommonState),
 165         VMSTATE_UINT8(special_fully_nested_mode, PICCommonState),
 166         VMSTATE_UINT8(init4, PICCommonState),
 167         VMSTATE_UINT8(single_mode, PICCommonState),
 168         VMSTATE_UINT8(elcr, PICCommonState),
 169         VMSTATE_END_OF_LIST()
 170     }
 171 };
 172
 173 static Property pic_properties_common[] = {
 174     DEFINE_PROP_UINT32("iobase", PICCommonState, iobase,  -1),
 175     DEFINE_PROP_UINT32("elcr_addr", PICCommonState, elcr_addr,  -1),
 176     DEFINE_PROP_UINT8("elcr_mask", PICCommonState, elcr_mask,  -1),
 177     DEFINE_PROP_BIT("master", PICCommonState, master,  0, false),
 178     DEFINE_PROP_END_OF_LIST(),
 179 };
 180
 181 static void pic_common_class_init(ObjectClass *klass, void *data)
 182 {
 183     DeviceClass *dc = DEVICE_CLASS(klass);
 184     InterruptStatsProviderClass *ic = INTERRUPT_STATS_PROVIDER_CLASS(klass);
 185
 186     dc->vmsd = &vmstate_pic_common;
 187     device_class_set_props(dc, pic_properties_common);
 188     dc->realize = pic_common_realize;
 189     /*
 190      * Reason: unlike ordinary ISA devices, the PICs need additional
 191      * wiring: its IRQ input lines are set up by board code, and the
 192      * wiring of the slave to the master is hard-coded in device model
 193      * code.
 194      */
 195     dc->user_creatable = false;
 196     ic->get_statistics = pic_get_statistics;
 197     ic->print_info = pic_print_info;
 198 }
 199
 200 static const TypeInfo pic_common_type = {
 201     .name = TYPE_PIC_COMMON,
 202     .parent = TYPE_ISA_DEVICE,
 203     .instance_size = sizeof(PICCommonState),
 204     .class_size = sizeof(PICCommonClass),
 205     .class_init = pic_common_class_init,
 206     .abstract = true,
 207     .interfaces = (InterfaceInfo[]) {
 208         { TYPE_INTERRUPT_STATS_PROVIDER },
 209         { }
 210     },
 211 };
 212
 213 static void pic_common_register_types(void)
 214 {
 215     type_register_static(&pic_common_type);
 216 }
 217
 218 type_init(pic_common_register_types)