include/hw/intc/arm_gic_common.h

   1 /*
   2  * ARM GIC support
   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 #ifndef HW_ARM_GIC_COMMON_H
  22 #define HW_ARM_GIC_COMMON_H
  23
  24 #include "hw/sysbus.h"
  25
  26 /* Maximum number of possible interrupts, determined by the GIC architecture */
  27 #define GIC_MAXIRQ 1020
  28 /* First 32 are private to each CPU (SGIs and PPIs). */
  29 #define GIC_INTERNAL 32
  30 #define GIC_NR_SGIS 16
  31 /* Maximum number of possible CPU interfaces, determined by GIC architecture */
  32 #define GIC_NCPU 8
  33
  34 #define MAX_NR_GROUP_PRIO 128
  35 #define GIC_NR_APRS (MAX_NR_GROUP_PRIO / 32)
  36
  37 #define GIC_MIN_BPR 0
  38 #define GIC_MIN_ABPR (GIC_MIN_BPR + 1)
  39
  40 typedef struct gic_irq_state {
  41     /* The enable bits are only banked for per-cpu interrupts.  */
  42     uint8_t enabled;
  43     uint8_t pending;
  44     uint8_t active;
  45     uint8_t level;
  46     bool model; /* 0 = N:N, 1 = 1:N */
  47     bool edge_trigger; /* true: edge-triggered, false: level-triggered  */
  48     uint8_t group;
  49 } gic_irq_state;
  50
  51 typedef struct GICState {
  52     /*< private >*/
  53     SysBusDevice parent_obj;
  54     /*< public >*/
  55
  56     qemu_irq parent_irq[GIC_NCPU];
  57     qemu_irq parent_fiq[GIC_NCPU];
  58     /* GICD_CTLR; for a GIC with the security extensions the NS banked version
  59      * of this register is just an alias of bit 1 of the S banked version.
  60      */
  61     uint32_t ctlr;
  62     /* GICC_CTLR; again, the NS banked version is just aliases of bits of
  63      * the S banked register, so our state only needs to store the S version.
  64      */
  65     uint32_t cpu_ctlr[GIC_NCPU];
  66
  67     gic_irq_state irq_state[GIC_MAXIRQ];
  68     uint8_t irq_target[GIC_MAXIRQ];
  69     uint8_t priority1[GIC_INTERNAL][GIC_NCPU];
  70     uint8_t priority2[GIC_MAXIRQ - GIC_INTERNAL];
  71     /* For each SGI on the target CPU, we store 8 bits
  72      * indicating which source CPUs have made this SGI
  73      * pending on the target CPU. These correspond to
  74      * the bytes in the GIC_SPENDSGIR* registers as
  75      * read by the target CPU.
  76      */
  77     uint8_t sgi_pending[GIC_NR_SGIS][GIC_NCPU];
  78
  79     uint16_t priority_mask[GIC_NCPU];
  80     uint16_t running_priority[GIC_NCPU];
  81     uint16_t current_pending[GIC_NCPU];
  82
  83     /* If we present the GICv2 without security extensions to a guest,
  84      * the guest can configure the GICC_CTLR to configure group 1 binary point
  85      * in the abpr.
  86      * For a GIC with Security Extensions we use use bpr for the
  87      * secure copy and abpr as storage for the non-secure copy of the register.
  88      */
  89     uint8_t  bpr[GIC_NCPU];
  90     uint8_t  abpr[GIC_NCPU];
  91
  92     /* The APR is implementation defined, so we choose a layout identical to
  93      * the KVM ABI layout for QEMU's implementation of the gic:
  94      * If an interrupt for preemption level X is active, then
  95      *   APRn[X mod 32] == 0b1,  where n = X / 32
  96      * otherwise the bit is clear.
  97      */
  98     uint32_t apr[GIC_NR_APRS][GIC_NCPU];
  99     uint32_t nsapr[GIC_NR_APRS][GIC_NCPU];
 100
 101     uint32_t num_cpu;
 102
 103     MemoryRegion iomem; /* Distributor */
 104     /* This is just so we can have an opaque pointer which identifies
 105      * both this GIC and which CPU interface we should be accessing.
 106      */
 107     struct GICState *backref[GIC_NCPU];
 108     MemoryRegion cpuiomem[GIC_NCPU + 1]; /* CPU interfaces */
 109     uint32_t num_irq;
 110     uint32_t revision;
 111     bool security_extn;
 112     bool irq_reset_nonsecure; /* configure IRQs as group 1 (NS) on reset? */
 113     int dev_fd; /* kvm device fd if backed by kvm vgic support */
 114     Error *migration_blocker;
 115 } GICState;
 116
 117 #define TYPE_ARM_GIC_COMMON "arm_gic_common"
 118 #define ARM_GIC_COMMON(obj) \
 119      OBJECT_CHECK(GICState, (obj), TYPE_ARM_GIC_COMMON)
 120 #define ARM_GIC_COMMON_CLASS(klass) \
 121      OBJECT_CLASS_CHECK(ARMGICCommonClass, (klass), TYPE_ARM_GIC_COMMON)
 122 #define ARM_GIC_COMMON_GET_CLASS(obj) \
 123      OBJECT_GET_CLASS(ARMGICCommonClass, (obj), TYPE_ARM_GIC_COMMON)
 124
 125 typedef struct ARMGICCommonClass {
 126     /*< private >*/
 127     SysBusDeviceClass parent_class;
 128     /*< public >*/
 129
 130     void (*pre_save)(GICState *s);
 131     void (*post_load)(GICState *s);
 132 } ARMGICCommonClass;
 133
 134 void gic_init_irqs_and_mmio(GICState *s, qemu_irq_handler handler,
 135                             const MemoryRegionOps *ops);
 136
 137 #endif