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/*
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* ARM Generic/Distributed Interrupt Controller
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*
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* Copyright (c) 2006-2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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/* This file contains implementation code for the RealView EB interrupt
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controller, MPCore distributed interrupt controller and ARMv7-M
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Nested Vectored Interrupt Controller. */
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//#define DEBUG_GIC
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#ifdef DEBUG_GIC
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#define DPRINTF(fmt, ...) \
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do { printf("arm_gic: " fmt , ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) do {} while(0) |
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#endif
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#ifdef NVIC
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static const uint8_t gic_id[] = |
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{ 0x00, 0xb0, 0x1b, 0x00, 0x0d, 0xe0, 0x05, 0xb1 };
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/* The NVIC has 16 internal vectors. However these are not exposed
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through the normal GIC interface. */
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#define GIC_BASE_IRQ 32 |
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#else
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static const uint8_t gic_id[] = |
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{ 0x90, 0x13, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
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#define GIC_BASE_IRQ 0 |
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#endif
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#define FROM_SYSBUSGIC(type, dev) \
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DO_UPCAST(type, gic, FROM_SYSBUS(gic_state, dev)) |
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typedef struct gic_irq_state |
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{
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/* ??? The documentation seems to imply the enable bits are global, even
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for per-cpu interrupts. This seems strange. */
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unsigned enabled:1; |
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unsigned pending:NCPU;
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unsigned active:NCPU;
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unsigned level:NCPU;
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unsigned model:1; /* 0 = N:N, 1 = 1:N */ |
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unsigned trigger:1; /* nonzero = edge triggered. */ |
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} gic_irq_state; |
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|
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#define ALL_CPU_MASK ((1 << NCPU) - 1) |
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#if NCPU > 1 |
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#define NUM_CPU(s) ((s)->num_cpu)
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#else
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#define NUM_CPU(s) 1 |
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#endif
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|
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#define GIC_SET_ENABLED(irq) s->irq_state[irq].enabled = 1 |
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#define GIC_CLEAR_ENABLED(irq) s->irq_state[irq].enabled = 0 |
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#define GIC_TEST_ENABLED(irq) s->irq_state[irq].enabled
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#define GIC_SET_PENDING(irq, cm) s->irq_state[irq].pending |= (cm)
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#define GIC_CLEAR_PENDING(irq, cm) s->irq_state[irq].pending &= ~(cm)
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#define GIC_TEST_PENDING(irq, cm) ((s->irq_state[irq].pending & (cm)) != 0) |
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#define GIC_SET_ACTIVE(irq, cm) s->irq_state[irq].active |= (cm)
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#define GIC_CLEAR_ACTIVE(irq, cm) s->irq_state[irq].active &= ~(cm)
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#define GIC_TEST_ACTIVE(irq, cm) ((s->irq_state[irq].active & (cm)) != 0) |
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#define GIC_SET_MODEL(irq) s->irq_state[irq].model = 1 |
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#define GIC_CLEAR_MODEL(irq) s->irq_state[irq].model = 0 |
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#define GIC_TEST_MODEL(irq) s->irq_state[irq].model
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#define GIC_SET_LEVEL(irq, cm) s->irq_state[irq].level = (cm)
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#define GIC_CLEAR_LEVEL(irq, cm) s->irq_state[irq].level &= ~(cm)
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#define GIC_TEST_LEVEL(irq, cm) ((s->irq_state[irq].level & (cm)) != 0) |
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#define GIC_SET_TRIGGER(irq) s->irq_state[irq].trigger = 1 |
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#define GIC_CLEAR_TRIGGER(irq) s->irq_state[irq].trigger = 0 |
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#define GIC_TEST_TRIGGER(irq) s->irq_state[irq].trigger
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#define GIC_GET_PRIORITY(irq, cpu) \
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(((irq) < 32) ? s->priority1[irq][cpu] : s->priority2[(irq) - 32]) |
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#ifdef NVIC
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#define GIC_TARGET(irq) 1 |
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#else
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#define GIC_TARGET(irq) s->irq_target[irq]
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#endif
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typedef struct gic_state |
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{
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SysBusDevice busdev; |
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qemu_irq parent_irq[NCPU]; |
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int enabled;
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int cpu_enabled[NCPU];
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|
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gic_irq_state irq_state[GIC_NIRQ]; |
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#ifndef NVIC
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int irq_target[GIC_NIRQ];
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#endif
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int priority1[32][NCPU]; |
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int priority2[GIC_NIRQ - 32]; |
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int last_active[GIC_NIRQ][NCPU];
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|
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int priority_mask[NCPU];
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int running_irq[NCPU];
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int running_priority[NCPU];
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int current_pending[NCPU];
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|
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#if NCPU > 1 |
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int num_cpu;
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#endif
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|
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int iomemtype;
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} gic_state; |
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/* TODO: Many places that call this routine could be optimized. */
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/* Update interrupt status after enabled or pending bits have been changed. */
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static void gic_update(gic_state *s) |
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{
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int best_irq;
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int best_prio;
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int irq;
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int level;
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int cpu;
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int cm;
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|
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for (cpu = 0; cpu < NUM_CPU(s); cpu++) { |
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cm = 1 << cpu;
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s->current_pending[cpu] = 1023;
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if (!s->enabled || !s->cpu_enabled[cpu]) {
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qemu_irq_lower(s->parent_irq[cpu]); |
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return;
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} |
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best_prio = 0x100;
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best_irq = 1023;
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for (irq = 0; irq < GIC_NIRQ; irq++) { |
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if (GIC_TEST_ENABLED(irq) && GIC_TEST_PENDING(irq, cm)) {
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if (GIC_GET_PRIORITY(irq, cpu) < best_prio) {
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best_prio = GIC_GET_PRIORITY(irq, cpu); |
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best_irq = irq; |
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} |
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} |
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} |
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level = 0;
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if (best_prio <= s->priority_mask[cpu]) {
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s->current_pending[cpu] = best_irq; |
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if (best_prio < s->running_priority[cpu]) {
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DPRINTF("Raised pending IRQ %d\n", best_irq);
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level = 1;
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} |
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} |
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qemu_set_irq(s->parent_irq[cpu], level); |
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} |
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} |
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|
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static void __attribute__((unused)) |
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gic_set_pending_private(gic_state *s, int cpu, int irq) |
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{
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int cm = 1 << cpu; |
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|
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if (GIC_TEST_PENDING(irq, cm))
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return;
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|
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DPRINTF("Set %d pending cpu %d\n", irq, cpu);
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GIC_SET_PENDING(irq, cm); |
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gic_update(s); |
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} |
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|
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/* Process a change in an external IRQ input. */
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static void gic_set_irq(void *opaque, int irq, int level) |
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{
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gic_state *s = (gic_state *)opaque; |
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/* The first external input line is internal interrupt 32. */
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irq += 32;
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if (level == GIC_TEST_LEVEL(irq, ALL_CPU_MASK))
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return;
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|
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if (level) {
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GIC_SET_LEVEL(irq, ALL_CPU_MASK); |
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if (GIC_TEST_TRIGGER(irq) || GIC_TEST_ENABLED(irq)) {
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DPRINTF("Set %d pending mask %x\n", irq, GIC_TARGET(irq));
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GIC_SET_PENDING(irq, GIC_TARGET(irq)); |
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} |
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} else {
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GIC_CLEAR_LEVEL(irq, ALL_CPU_MASK); |
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} |
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gic_update(s); |
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} |
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|
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static void gic_set_running_irq(gic_state *s, int cpu, int irq) |
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{
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s->running_irq[cpu] = irq; |
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if (irq == 1023) { |
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s->running_priority[cpu] = 0x100;
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} else {
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s->running_priority[cpu] = GIC_GET_PRIORITY(irq, cpu); |
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} |
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gic_update(s); |
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} |
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|
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static uint32_t gic_acknowledge_irq(gic_state *s, int cpu) |
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{
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int new_irq;
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int cm = 1 << cpu; |
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new_irq = s->current_pending[cpu]; |
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if (new_irq == 1023 |
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|| GIC_GET_PRIORITY(new_irq, cpu) >= s->running_priority[cpu]) {
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DPRINTF("ACK no pending IRQ\n");
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return 1023; |
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} |
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s->last_active[new_irq][cpu] = s->running_irq[cpu]; |
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/* Clear pending flags for both level and edge triggered interrupts.
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Level triggered IRQs will be reasserted once they become inactive. */
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GIC_CLEAR_PENDING(new_irq, GIC_TEST_MODEL(new_irq) ? ALL_CPU_MASK : cm); |
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gic_set_running_irq(s, cpu, new_irq); |
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DPRINTF("ACK %d\n", new_irq);
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return new_irq;
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} |
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|
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static void gic_complete_irq(gic_state * s, int cpu, int irq) |
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{
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int update = 0; |
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int cm = 1 << cpu; |
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DPRINTF("EOI %d\n", irq);
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if (s->running_irq[cpu] == 1023) |
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return; /* No active IRQ. */ |
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if (irq != 1023) { |
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/* Mark level triggered interrupts as pending if they are still
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raised. */
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if (!GIC_TEST_TRIGGER(irq) && GIC_TEST_ENABLED(irq)
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&& GIC_TEST_LEVEL(irq, cm) && (GIC_TARGET(irq) & cm) != 0) {
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DPRINTF("Set %d pending mask %x\n", irq, cm);
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GIC_SET_PENDING(irq, cm); |
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update = 1;
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} |
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} |
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if (irq != s->running_irq[cpu]) {
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/* Complete an IRQ that is not currently running. */
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int tmp = s->running_irq[cpu];
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while (s->last_active[tmp][cpu] != 1023) { |
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if (s->last_active[tmp][cpu] == irq) {
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s->last_active[tmp][cpu] = s->last_active[irq][cpu]; |
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break;
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} |
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tmp = s->last_active[tmp][cpu]; |
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} |
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if (update) {
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gic_update(s); |
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} |
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} else {
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/* Complete the current running IRQ. */
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gic_set_running_irq(s, cpu, s->last_active[s->running_irq[cpu]][cpu]); |
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} |
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} |
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|
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static uint32_t gic_dist_readb(void *opaque, target_phys_addr_t offset) |
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{
|
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gic_state *s = (gic_state *)opaque; |
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uint32_t res; |
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int irq;
|
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int i;
|
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int cpu;
|
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int cm;
|
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int mask;
|
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|
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cpu = gic_get_current_cpu(); |
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cm = 1 << cpu;
|
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if (offset < 0x100) { |
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#ifndef NVIC
|
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if (offset == 0) |
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return s->enabled;
|
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if (offset == 4) |
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return ((GIC_NIRQ / 32) - 1) | ((NUM_CPU(s) - 1) << 5); |
| 268 |
if (offset < 0x08) |
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return 0; |
| 270 |
#endif
|
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goto bad_reg;
|
| 272 |
} else if (offset < 0x200) { |
| 273 |
/* Interrupt Set/Clear Enable. */
|
| 274 |
if (offset < 0x180) |
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irq = (offset - 0x100) * 8; |
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else
|
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irq = (offset - 0x180) * 8; |
| 278 |
irq += GIC_BASE_IRQ; |
| 279 |
if (irq >= GIC_NIRQ)
|
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goto bad_reg;
|
| 281 |
res = 0;
|
| 282 |
for (i = 0; i < 8; i++) { |
| 283 |
if (GIC_TEST_ENABLED(irq + i)) {
|
| 284 |
res |= (1 << i);
|
| 285 |
} |
| 286 |
} |
| 287 |
} else if (offset < 0x300) { |
| 288 |
/* Interrupt Set/Clear Pending. */
|
| 289 |
if (offset < 0x280) |
| 290 |
irq = (offset - 0x200) * 8; |
| 291 |
else
|
| 292 |
irq = (offset - 0x280) * 8; |
| 293 |
irq += GIC_BASE_IRQ; |
| 294 |
if (irq >= GIC_NIRQ)
|
| 295 |
goto bad_reg;
|
| 296 |
res = 0;
|
| 297 |
mask = (irq < 32) ? cm : ALL_CPU_MASK;
|
| 298 |
for (i = 0; i < 8; i++) { |
| 299 |
if (GIC_TEST_PENDING(irq + i, mask)) {
|
| 300 |
res |= (1 << i);
|
| 301 |
} |
| 302 |
} |
| 303 |
} else if (offset < 0x400) { |
| 304 |
/* Interrupt Active. */
|
| 305 |
irq = (offset - 0x300) * 8 + GIC_BASE_IRQ; |
| 306 |
if (irq >= GIC_NIRQ)
|
| 307 |
goto bad_reg;
|
| 308 |
res = 0;
|
| 309 |
mask = (irq < 32) ? cm : ALL_CPU_MASK;
|
| 310 |
for (i = 0; i < 8; i++) { |
| 311 |
if (GIC_TEST_ACTIVE(irq + i, mask)) {
|
| 312 |
res |= (1 << i);
|
| 313 |
} |
| 314 |
} |
| 315 |
} else if (offset < 0x800) { |
| 316 |
/* Interrupt Priority. */
|
| 317 |
irq = (offset - 0x400) + GIC_BASE_IRQ;
|
| 318 |
if (irq >= GIC_NIRQ)
|
| 319 |
goto bad_reg;
|
| 320 |
res = GIC_GET_PRIORITY(irq, cpu); |
| 321 |
#ifndef NVIC
|
| 322 |
} else if (offset < 0xc00) { |
| 323 |
/* Interrupt CPU Target. */
|
| 324 |
irq = (offset - 0x800) + GIC_BASE_IRQ;
|
| 325 |
if (irq >= GIC_NIRQ)
|
| 326 |
goto bad_reg;
|
| 327 |
if (irq >= 29 && irq <= 31) { |
| 328 |
res = cm; |
| 329 |
} else {
|
| 330 |
res = GIC_TARGET(irq); |
| 331 |
} |
| 332 |
} else if (offset < 0xf00) { |
| 333 |
/* Interrupt Configuration. */
|
| 334 |
irq = (offset - 0xc00) * 2 + GIC_BASE_IRQ; |
| 335 |
if (irq >= GIC_NIRQ)
|
| 336 |
goto bad_reg;
|
| 337 |
res = 0;
|
| 338 |
for (i = 0; i < 4; i++) { |
| 339 |
if (GIC_TEST_MODEL(irq + i))
|
| 340 |
res |= (1 << (i * 2)); |
| 341 |
if (GIC_TEST_TRIGGER(irq + i))
|
| 342 |
res |= (2 << (i * 2)); |
| 343 |
} |
| 344 |
#endif
|
| 345 |
} else if (offset < 0xfe0) { |
| 346 |
goto bad_reg;
|
| 347 |
} else /* offset >= 0xfe0 */ { |
| 348 |
if (offset & 3) { |
| 349 |
res = 0;
|
| 350 |
} else {
|
| 351 |
res = gic_id[(offset - 0xfe0) >> 2]; |
| 352 |
} |
| 353 |
} |
| 354 |
return res;
|
| 355 |
bad_reg:
|
| 356 |
hw_error("gic_dist_readb: Bad offset %x\n", (int)offset); |
| 357 |
return 0; |
| 358 |
} |
| 359 |
|
| 360 |
static uint32_t gic_dist_readw(void *opaque, target_phys_addr_t offset) |
| 361 |
{
|
| 362 |
uint32_t val; |
| 363 |
val = gic_dist_readb(opaque, offset); |
| 364 |
val |= gic_dist_readb(opaque, offset + 1) << 8; |
| 365 |
return val;
|
| 366 |
} |
| 367 |
|
| 368 |
static uint32_t gic_dist_readl(void *opaque, target_phys_addr_t offset) |
| 369 |
{
|
| 370 |
uint32_t val; |
| 371 |
#ifdef NVIC
|
| 372 |
gic_state *s = (gic_state *)opaque; |
| 373 |
uint32_t addr; |
| 374 |
addr = offset; |
| 375 |
if (addr < 0x100 || addr > 0xd00) |
| 376 |
return nvic_readl(s, addr);
|
| 377 |
#endif
|
| 378 |
val = gic_dist_readw(opaque, offset); |
| 379 |
val |= gic_dist_readw(opaque, offset + 2) << 16; |
| 380 |
return val;
|
| 381 |
} |
| 382 |
|
| 383 |
static void gic_dist_writeb(void *opaque, target_phys_addr_t offset, |
| 384 |
uint32_t value) |
| 385 |
{
|
| 386 |
gic_state *s = (gic_state *)opaque; |
| 387 |
int irq;
|
| 388 |
int i;
|
| 389 |
int cpu;
|
| 390 |
|
| 391 |
cpu = gic_get_current_cpu(); |
| 392 |
if (offset < 0x100) { |
| 393 |
#ifdef NVIC
|
| 394 |
goto bad_reg;
|
| 395 |
#else
|
| 396 |
if (offset == 0) { |
| 397 |
s->enabled = (value & 1);
|
| 398 |
DPRINTF("Distribution %sabled\n", s->enabled ? "En" : "Dis"); |
| 399 |
} else if (offset < 4) { |
| 400 |
/* ignored. */
|
| 401 |
} else {
|
| 402 |
goto bad_reg;
|
| 403 |
} |
| 404 |
#endif
|
| 405 |
} else if (offset < 0x180) { |
| 406 |
/* Interrupt Set Enable. */
|
| 407 |
irq = (offset - 0x100) * 8 + GIC_BASE_IRQ; |
| 408 |
if (irq >= GIC_NIRQ)
|
| 409 |
goto bad_reg;
|
| 410 |
if (irq < 16) |
| 411 |
value = 0xff;
|
| 412 |
for (i = 0; i < 8; i++) { |
| 413 |
if (value & (1 << i)) { |
| 414 |
int mask = (irq < 32) ? (1 << cpu) : GIC_TARGET(irq); |
| 415 |
if (!GIC_TEST_ENABLED(irq + i))
|
| 416 |
DPRINTF("Enabled IRQ %d\n", irq + i);
|
| 417 |
GIC_SET_ENABLED(irq + i); |
| 418 |
/* If a raised level triggered IRQ enabled then mark
|
| 419 |
is as pending. */
|
| 420 |
if (GIC_TEST_LEVEL(irq + i, mask)
|
| 421 |
&& !GIC_TEST_TRIGGER(irq + i)) {
|
| 422 |
DPRINTF("Set %d pending mask %x\n", irq + i, mask);
|
| 423 |
GIC_SET_PENDING(irq + i, mask); |
| 424 |
} |
| 425 |
} |
| 426 |
} |
| 427 |
} else if (offset < 0x200) { |
| 428 |
/* Interrupt Clear Enable. */
|
| 429 |
irq = (offset - 0x180) * 8 + GIC_BASE_IRQ; |
| 430 |
if (irq >= GIC_NIRQ)
|
| 431 |
goto bad_reg;
|
| 432 |
if (irq < 16) |
| 433 |
value = 0;
|
| 434 |
for (i = 0; i < 8; i++) { |
| 435 |
if (value & (1 << i)) { |
| 436 |
if (GIC_TEST_ENABLED(irq + i))
|
| 437 |
DPRINTF("Disabled IRQ %d\n", irq + i);
|
| 438 |
GIC_CLEAR_ENABLED(irq + i); |
| 439 |
} |
| 440 |
} |
| 441 |
} else if (offset < 0x280) { |
| 442 |
/* Interrupt Set Pending. */
|
| 443 |
irq = (offset - 0x200) * 8 + GIC_BASE_IRQ; |
| 444 |
if (irq >= GIC_NIRQ)
|
| 445 |
goto bad_reg;
|
| 446 |
if (irq < 16) |
| 447 |
irq = 0;
|
| 448 |
|
| 449 |
for (i = 0; i < 8; i++) { |
| 450 |
if (value & (1 << i)) { |
| 451 |
GIC_SET_PENDING(irq + i, GIC_TARGET(irq)); |
| 452 |
} |
| 453 |
} |
| 454 |
} else if (offset < 0x300) { |
| 455 |
/* Interrupt Clear Pending. */
|
| 456 |
irq = (offset - 0x280) * 8 + GIC_BASE_IRQ; |
| 457 |
if (irq >= GIC_NIRQ)
|
| 458 |
goto bad_reg;
|
| 459 |
for (i = 0; i < 8; i++) { |
| 460 |
/* ??? This currently clears the pending bit for all CPUs, even
|
| 461 |
for per-CPU interrupts. It's unclear whether this is the
|
| 462 |
corect behavior. */
|
| 463 |
if (value & (1 << i)) { |
| 464 |
GIC_CLEAR_PENDING(irq + i, ALL_CPU_MASK); |
| 465 |
} |
| 466 |
} |
| 467 |
} else if (offset < 0x400) { |
| 468 |
/* Interrupt Active. */
|
| 469 |
goto bad_reg;
|
| 470 |
} else if (offset < 0x800) { |
| 471 |
/* Interrupt Priority. */
|
| 472 |
irq = (offset - 0x400) + GIC_BASE_IRQ;
|
| 473 |
if (irq >= GIC_NIRQ)
|
| 474 |
goto bad_reg;
|
| 475 |
if (irq < 32) { |
| 476 |
s->priority1[irq][cpu] = value; |
| 477 |
} else {
|
| 478 |
s->priority2[irq - 32] = value;
|
| 479 |
} |
| 480 |
#ifndef NVIC
|
| 481 |
} else if (offset < 0xc00) { |
| 482 |
/* Interrupt CPU Target. */
|
| 483 |
irq = (offset - 0x800) + GIC_BASE_IRQ;
|
| 484 |
if (irq >= GIC_NIRQ)
|
| 485 |
goto bad_reg;
|
| 486 |
if (irq < 29) |
| 487 |
value = 0;
|
| 488 |
else if (irq < 32) |
| 489 |
value = ALL_CPU_MASK; |
| 490 |
s->irq_target[irq] = value & ALL_CPU_MASK; |
| 491 |
} else if (offset < 0xf00) { |
| 492 |
/* Interrupt Configuration. */
|
| 493 |
irq = (offset - 0xc00) * 4 + GIC_BASE_IRQ; |
| 494 |
if (irq >= GIC_NIRQ)
|
| 495 |
goto bad_reg;
|
| 496 |
if (irq < 32) |
| 497 |
value |= 0xaa;
|
| 498 |
for (i = 0; i < 4; i++) { |
| 499 |
if (value & (1 << (i * 2))) { |
| 500 |
GIC_SET_MODEL(irq + i); |
| 501 |
} else {
|
| 502 |
GIC_CLEAR_MODEL(irq + i); |
| 503 |
} |
| 504 |
if (value & (2 << (i * 2))) { |
| 505 |
GIC_SET_TRIGGER(irq + i); |
| 506 |
} else {
|
| 507 |
GIC_CLEAR_TRIGGER(irq + i); |
| 508 |
} |
| 509 |
} |
| 510 |
#endif
|
| 511 |
} else {
|
| 512 |
/* 0xf00 is only handled for 32-bit writes. */
|
| 513 |
goto bad_reg;
|
| 514 |
} |
| 515 |
gic_update(s); |
| 516 |
return;
|
| 517 |
bad_reg:
|
| 518 |
hw_error("gic_dist_writeb: Bad offset %x\n", (int)offset); |
| 519 |
} |
| 520 |
|
| 521 |
static void gic_dist_writew(void *opaque, target_phys_addr_t offset, |
| 522 |
uint32_t value) |
| 523 |
{
|
| 524 |
gic_dist_writeb(opaque, offset, value & 0xff);
|
| 525 |
gic_dist_writeb(opaque, offset + 1, value >> 8); |
| 526 |
} |
| 527 |
|
| 528 |
static void gic_dist_writel(void *opaque, target_phys_addr_t offset, |
| 529 |
uint32_t value) |
| 530 |
{
|
| 531 |
gic_state *s = (gic_state *)opaque; |
| 532 |
#ifdef NVIC
|
| 533 |
uint32_t addr; |
| 534 |
addr = offset; |
| 535 |
if (addr < 0x100 || (addr > 0xd00 && addr != 0xf00)) { |
| 536 |
nvic_writel(s, addr, value); |
| 537 |
return;
|
| 538 |
} |
| 539 |
#endif
|
| 540 |
if (offset == 0xf00) { |
| 541 |
int cpu;
|
| 542 |
int irq;
|
| 543 |
int mask;
|
| 544 |
|
| 545 |
cpu = gic_get_current_cpu(); |
| 546 |
irq = value & 0x3ff;
|
| 547 |
switch ((value >> 24) & 3) { |
| 548 |
case 0: |
| 549 |
mask = (value >> 16) & ALL_CPU_MASK;
|
| 550 |
break;
|
| 551 |
case 1: |
| 552 |
mask = 1 << cpu;
|
| 553 |
break;
|
| 554 |
case 2: |
| 555 |
mask = ALL_CPU_MASK ^ (1 << cpu);
|
| 556 |
break;
|
| 557 |
default:
|
| 558 |
DPRINTF("Bad Soft Int target filter\n");
|
| 559 |
mask = ALL_CPU_MASK; |
| 560 |
break;
|
| 561 |
} |
| 562 |
GIC_SET_PENDING(irq, mask); |
| 563 |
gic_update(s); |
| 564 |
return;
|
| 565 |
} |
| 566 |
gic_dist_writew(opaque, offset, value & 0xffff);
|
| 567 |
gic_dist_writew(opaque, offset + 2, value >> 16); |
| 568 |
} |
| 569 |
|
| 570 |
static CPUReadMemoryFunc * const gic_dist_readfn[] = { |
| 571 |
gic_dist_readb, |
| 572 |
gic_dist_readw, |
| 573 |
gic_dist_readl |
| 574 |
}; |
| 575 |
|
| 576 |
static CPUWriteMemoryFunc * const gic_dist_writefn[] = { |
| 577 |
gic_dist_writeb, |
| 578 |
gic_dist_writew, |
| 579 |
gic_dist_writel |
| 580 |
}; |
| 581 |
|
| 582 |
#ifndef NVIC
|
| 583 |
static uint32_t gic_cpu_read(gic_state *s, int cpu, int offset) |
| 584 |
{
|
| 585 |
switch (offset) {
|
| 586 |
case 0x00: /* Control */ |
| 587 |
return s->cpu_enabled[cpu];
|
| 588 |
case 0x04: /* Priority mask */ |
| 589 |
return s->priority_mask[cpu];
|
| 590 |
case 0x08: /* Binary Point */ |
| 591 |
/* ??? Not implemented. */
|
| 592 |
return 0; |
| 593 |
case 0x0c: /* Acknowledge */ |
| 594 |
return gic_acknowledge_irq(s, cpu);
|
| 595 |
case 0x14: /* Runing Priority */ |
| 596 |
return s->running_priority[cpu];
|
| 597 |
case 0x18: /* Highest Pending Interrupt */ |
| 598 |
return s->current_pending[cpu];
|
| 599 |
default:
|
| 600 |
hw_error("gic_cpu_read: Bad offset %x\n", (int)offset); |
| 601 |
return 0; |
| 602 |
} |
| 603 |
} |
| 604 |
|
| 605 |
static void gic_cpu_write(gic_state *s, int cpu, int offset, uint32_t value) |
| 606 |
{
|
| 607 |
switch (offset) {
|
| 608 |
case 0x00: /* Control */ |
| 609 |
s->cpu_enabled[cpu] = (value & 1);
|
| 610 |
DPRINTF("CPU %d %sabled\n", cpu, s->cpu_enabled ? "En" : "Dis"); |
| 611 |
break;
|
| 612 |
case 0x04: /* Priority mask */ |
| 613 |
s->priority_mask[cpu] = (value & 0xff);
|
| 614 |
break;
|
| 615 |
case 0x08: /* Binary Point */ |
| 616 |
/* ??? Not implemented. */
|
| 617 |
break;
|
| 618 |
case 0x10: /* End Of Interrupt */ |
| 619 |
return gic_complete_irq(s, cpu, value & 0x3ff); |
| 620 |
default:
|
| 621 |
hw_error("gic_cpu_write: Bad offset %x\n", (int)offset); |
| 622 |
return;
|
| 623 |
} |
| 624 |
gic_update(s); |
| 625 |
} |
| 626 |
#endif
|
| 627 |
|
| 628 |
static void gic_reset(gic_state *s) |
| 629 |
{
|
| 630 |
int i;
|
| 631 |
memset(s->irq_state, 0, GIC_NIRQ * sizeof(gic_irq_state)); |
| 632 |
for (i = 0 ; i < NUM_CPU(s); i++) { |
| 633 |
s->priority_mask[i] = 0xf0;
|
| 634 |
s->current_pending[i] = 1023;
|
| 635 |
s->running_irq[i] = 1023;
|
| 636 |
s->running_priority[i] = 0x100;
|
| 637 |
#ifdef NVIC
|
| 638 |
/* The NVIC doesn't have per-cpu interfaces, so enable by default. */
|
| 639 |
s->cpu_enabled[i] = 1;
|
| 640 |
#else
|
| 641 |
s->cpu_enabled[i] = 0;
|
| 642 |
#endif
|
| 643 |
} |
| 644 |
for (i = 0; i < 16; i++) { |
| 645 |
GIC_SET_ENABLED(i); |
| 646 |
GIC_SET_TRIGGER(i); |
| 647 |
} |
| 648 |
#ifdef NVIC
|
| 649 |
/* The NVIC is always enabled. */
|
| 650 |
s->enabled = 1;
|
| 651 |
#else
|
| 652 |
s->enabled = 0;
|
| 653 |
#endif
|
| 654 |
} |
| 655 |
|
| 656 |
static void gic_save(QEMUFile *f, void *opaque) |
| 657 |
{
|
| 658 |
gic_state *s = (gic_state *)opaque; |
| 659 |
int i;
|
| 660 |
int j;
|
| 661 |
|
| 662 |
qemu_put_be32(f, s->enabled); |
| 663 |
for (i = 0; i < NUM_CPU(s); i++) { |
| 664 |
qemu_put_be32(f, s->cpu_enabled[i]); |
| 665 |
#ifndef NVIC
|
| 666 |
qemu_put_be32(f, s->irq_target[i]); |
| 667 |
#endif
|
| 668 |
for (j = 0; j < 32; j++) |
| 669 |
qemu_put_be32(f, s->priority1[j][i]); |
| 670 |
for (j = 0; j < GIC_NIRQ; j++) |
| 671 |
qemu_put_be32(f, s->last_active[j][i]); |
| 672 |
qemu_put_be32(f, s->priority_mask[i]); |
| 673 |
qemu_put_be32(f, s->running_irq[i]); |
| 674 |
qemu_put_be32(f, s->running_priority[i]); |
| 675 |
qemu_put_be32(f, s->current_pending[i]); |
| 676 |
} |
| 677 |
for (i = 0; i < GIC_NIRQ - 32; i++) { |
| 678 |
qemu_put_be32(f, s->priority2[i]); |
| 679 |
} |
| 680 |
for (i = 0; i < GIC_NIRQ; i++) { |
| 681 |
qemu_put_byte(f, s->irq_state[i].enabled); |
| 682 |
qemu_put_byte(f, s->irq_state[i].pending); |
| 683 |
qemu_put_byte(f, s->irq_state[i].active); |
| 684 |
qemu_put_byte(f, s->irq_state[i].level); |
| 685 |
qemu_put_byte(f, s->irq_state[i].model); |
| 686 |
qemu_put_byte(f, s->irq_state[i].trigger); |
| 687 |
} |
| 688 |
} |
| 689 |
|
| 690 |
static int gic_load(QEMUFile *f, void *opaque, int version_id) |
| 691 |
{
|
| 692 |
gic_state *s = (gic_state *)opaque; |
| 693 |
int i;
|
| 694 |
int j;
|
| 695 |
|
| 696 |
if (version_id != 1) |
| 697 |
return -EINVAL;
|
| 698 |
|
| 699 |
s->enabled = qemu_get_be32(f); |
| 700 |
for (i = 0; i < NUM_CPU(s); i++) { |
| 701 |
s->cpu_enabled[i] = qemu_get_be32(f); |
| 702 |
#ifndef NVIC
|
| 703 |
s->irq_target[i] = qemu_get_be32(f); |
| 704 |
#endif
|
| 705 |
for (j = 0; j < 32; j++) |
| 706 |
s->priority1[j][i] = qemu_get_be32(f); |
| 707 |
for (j = 0; j < GIC_NIRQ; j++) |
| 708 |
s->last_active[j][i] = qemu_get_be32(f); |
| 709 |
s->priority_mask[i] = qemu_get_be32(f); |
| 710 |
s->running_irq[i] = qemu_get_be32(f); |
| 711 |
s->running_priority[i] = qemu_get_be32(f); |
| 712 |
s->current_pending[i] = qemu_get_be32(f); |
| 713 |
} |
| 714 |
for (i = 0; i < GIC_NIRQ - 32; i++) { |
| 715 |
s->priority2[i] = qemu_get_be32(f); |
| 716 |
} |
| 717 |
for (i = 0; i < GIC_NIRQ; i++) { |
| 718 |
s->irq_state[i].enabled = qemu_get_byte(f); |
| 719 |
s->irq_state[i].pending = qemu_get_byte(f); |
| 720 |
s->irq_state[i].active = qemu_get_byte(f); |
| 721 |
s->irq_state[i].level = qemu_get_byte(f); |
| 722 |
s->irq_state[i].model = qemu_get_byte(f); |
| 723 |
s->irq_state[i].trigger = qemu_get_byte(f); |
| 724 |
} |
| 725 |
|
| 726 |
return 0; |
| 727 |
} |
| 728 |
|
| 729 |
#if NCPU > 1 |
| 730 |
static void gic_init(gic_state *s, int num_cpu) |
| 731 |
#else
|
| 732 |
static void gic_init(gic_state *s) |
| 733 |
#endif
|
| 734 |
{
|
| 735 |
int i;
|
| 736 |
|
| 737 |
#if NCPU > 1 |
| 738 |
s->num_cpu = num_cpu; |
| 739 |
#endif
|
| 740 |
qdev_init_gpio_in(&s->busdev.qdev, gic_set_irq, GIC_NIRQ - 32);
|
| 741 |
for (i = 0; i < NUM_CPU(s); i++) { |
| 742 |
sysbus_init_irq(&s->busdev, &s->parent_irq[i]); |
| 743 |
} |
| 744 |
s->iomemtype = cpu_register_io_memory(gic_dist_readfn, |
| 745 |
gic_dist_writefn, s); |
| 746 |
gic_reset(s); |
| 747 |
register_savevm(NULL, "arm_gic", -1, 1, gic_save, gic_load, s); |
| 748 |
} |