hw/arm_gic_common.c

   1 /*
   2  * ARM GIC support - common bits of emulated and KVM kernel model
   3  *
   4  * Copyright (c) 2012 Linaro Limited
   5  * Written by Peter Maydell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "arm_gic_internal.h"
  22
  23 static void gic_save(QEMUFile *f, void *opaque)
  24 {
  25     gic_state *s = (gic_state *)opaque;
  26     int i;
  27     int j;
  28
  29     qemu_put_be32(f, s->enabled);
  30     for (i = 0; i < s->num_cpu; i++) {
  31         qemu_put_be32(f, s->cpu_enabled[i]);
  32         for (j = 0; j < GIC_INTERNAL; j++) {
  33             qemu_put_be32(f, s->priority1[j][i]);
  34         }
  35         for (j = 0; j < s->num_irq; j++) {
  36             qemu_put_be32(f, s->last_active[j][i]);
  37         }
  38         qemu_put_be32(f, s->priority_mask[i]);
  39         qemu_put_be32(f, s->running_irq[i]);
  40         qemu_put_be32(f, s->running_priority[i]);
  41         qemu_put_be32(f, s->current_pending[i]);
  42     }
  43     for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) {
  44         qemu_put_be32(f, s->priority2[i]);
  45     }
  46     for (i = 0; i < s->num_irq; i++) {
  47         qemu_put_be32(f, s->irq_target[i]);
  48         qemu_put_byte(f, s->irq_state[i].enabled);
  49         qemu_put_byte(f, s->irq_state[i].pending);
  50         qemu_put_byte(f, s->irq_state[i].active);
  51         qemu_put_byte(f, s->irq_state[i].level);
  52         qemu_put_byte(f, s->irq_state[i].model);
  53         qemu_put_byte(f, s->irq_state[i].trigger);
  54     }
  55 }
  56
  57 static int gic_load(QEMUFile *f, void *opaque, int version_id)
  58 {
  59     gic_state *s = (gic_state *)opaque;
  60     int i;
  61     int j;
  62
  63     if (version_id != 3) {
  64         return -EINVAL;
  65     }
  66
  67     s->enabled = qemu_get_be32(f);
  68     for (i = 0; i < s->num_cpu; i++) {
  69         s->cpu_enabled[i] = qemu_get_be32(f);
  70         for (j = 0; j < GIC_INTERNAL; j++) {
  71             s->priority1[j][i] = qemu_get_be32(f);
  72         }
  73         for (j = 0; j < s->num_irq; j++) {
  74             s->last_active[j][i] = qemu_get_be32(f);
  75         }
  76         s->priority_mask[i] = qemu_get_be32(f);
  77         s->running_irq[i] = qemu_get_be32(f);
  78         s->running_priority[i] = qemu_get_be32(f);
  79         s->current_pending[i] = qemu_get_be32(f);
  80     }
  81     for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) {
  82         s->priority2[i] = qemu_get_be32(f);
  83     }
  84     for (i = 0; i < s->num_irq; i++) {
  85         s->irq_target[i] = qemu_get_be32(f);
  86         s->irq_state[i].enabled = qemu_get_byte(f);
  87         s->irq_state[i].pending = qemu_get_byte(f);
  88         s->irq_state[i].active = qemu_get_byte(f);
  89         s->irq_state[i].level = qemu_get_byte(f);
  90         s->irq_state[i].model = qemu_get_byte(f);
  91         s->irq_state[i].trigger = qemu_get_byte(f);
  92     }
  93
  94     return 0;
  95 }
  96
  97 static int arm_gic_common_init(SysBusDevice *dev)
  98 {
  99     gic_state *s = FROM_SYSBUS(gic_state, dev);
 100     int num_irq = s->num_irq;
 101
 102     if (s->num_cpu > NCPU) {
 103         hw_error("requested %u CPUs exceeds GIC maximum %d\n",
 104                  s->num_cpu, NCPU);
 105     }
 106     s->num_irq += GIC_BASE_IRQ;
 107     if (s->num_irq > GIC_MAXIRQ) {
 108         hw_error("requested %u interrupt lines exceeds GIC maximum %d\n",
 109                  num_irq, GIC_MAXIRQ);
 110     }
 111     /* ITLinesNumber is represented as (N / 32) - 1 (see
 112      * gic_dist_readb) so this is an implementation imposed
 113      * restriction, not an architectural one:
 114      */
 115     if (s->num_irq < 32 || (s->num_irq % 32)) {
 116         hw_error("%d interrupt lines unsupported: not divisible by 32\n",
 117                  num_irq);
 118     }
 119
 120     register_savevm(NULL, "arm_gic", -1, 3, gic_save, gic_load, s);
 121     return 0;
 122 }
 123
 124 static void arm_gic_common_reset(DeviceState *dev)
 125 {
 126     gic_state *s = FROM_SYSBUS(gic_state, sysbus_from_qdev(dev));
 127     int i;
 128     memset(s->irq_state, 0, GIC_MAXIRQ * sizeof(gic_irq_state));
 129     for (i = 0 ; i < s->num_cpu; i++) {
 130         s->priority_mask[i] = 0xf0;
 131         s->current_pending[i] = 1023;
 132         s->running_irq[i] = 1023;
 133         s->running_priority[i] = 0x100;
 134         s->cpu_enabled[i] = 0;
 135     }
 136     for (i = 0; i < 16; i++) {
 137         GIC_SET_ENABLED(i, ALL_CPU_MASK);
 138         GIC_SET_TRIGGER(i);
 139     }
 140     if (s->num_cpu == 1) {
 141         /* For uniprocessor GICs all interrupts always target the sole CPU */
 142         for (i = 0; i < GIC_MAXIRQ; i++) {
 143             s->irq_target[i] = 1;
 144         }
 145     }
 146     s->enabled = 0;
 147 }
 148
 149 static Property arm_gic_common_properties[] = {
 150     DEFINE_PROP_UINT32("num-cpu", gic_state, num_cpu, 1),
 151     DEFINE_PROP_UINT32("num-irq", gic_state, num_irq, 32),
 152     /* Revision can be 1 or 2 for GIC architecture specification
 153      * versions 1 or 2, or 0 to indicate the legacy 11MPCore GIC.
 154      * (Internally, 0xffffffff also indicates "not a GIC but an NVIC".)
 155      */
 156     DEFINE_PROP_UINT32("revision", gic_state, revision, 1),
 157     DEFINE_PROP_END_OF_LIST(),
 158 };
 159
 160 static void arm_gic_common_class_init(ObjectClass *klass, void *data)
 161 {
 162     SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);
 163     DeviceClass *dc = DEVICE_CLASS(klass);
 164     dc->reset = arm_gic_common_reset;
 165     dc->props = arm_gic_common_properties;
 166     dc->no_user = 1;
 167     sc->init = arm_gic_common_init;
 168 }
 169
 170 static TypeInfo arm_gic_common_type = {
 171     .name = TYPE_ARM_GIC_COMMON,
 172     .parent = TYPE_SYS_BUS_DEVICE,
 173     .instance_size = sizeof(gic_state),
 174     .class_size = sizeof(ARMGICCommonClass),
 175     .class_init = arm_gic_common_class_init,
 176     .abstract = true,
 177 };
 178
 179 static void register_types(void)
 180 {
 181     type_register_static(&arm_gic_common_type);
 182 }
 183
 184 type_init(register_types)