| /* |
| * ARM Generic/Distributed Interrupt Controller |
| * |
| * Copyright (c) 2006-2007 CodeSourcery. |
| * Written by Paul Brook |
| * |
| * This code is licensed under the GPL. |
| */ |
| |
| /* This file contains implementation code for the RealView EB interrupt |
| controller, MPCore distributed interrupt controller and ARMv7-M |
| Nested Vectored Interrupt Controller. */ |
| |
| /* Maximum number of possible interrupts, determined by the GIC architecture */ |
| #define GIC_MAXIRQ 1020 |
| /* First 32 are private to each CPU (SGIs and PPIs). */ |
| #define GIC_INTERNAL 32 |
| //#define DEBUG_GIC |
| |
| #ifdef DEBUG_GIC |
| #define DPRINTF(fmt, ...) \ |
| do { printf("arm_gic: " fmt , ## __VA_ARGS__); } while (0) |
| #else |
| #define DPRINTF(fmt, ...) do {} while(0) |
| #endif |
| |
| #ifdef NVIC |
| static const uint8_t gic_id[] = |
| { 0x00, 0xb0, 0x1b, 0x00, 0x0d, 0xe0, 0x05, 0xb1 }; |
| /* The NVIC has 16 internal vectors. However these are not exposed |
| through the normal GIC interface. */ |
| #define GIC_BASE_IRQ 32 |
| #else |
| static const uint8_t gic_id[] = |
| { 0x90, 0x13, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 }; |
| #define GIC_BASE_IRQ 0 |
| #endif |
| |
| #define FROM_SYSBUSGIC(type, dev) \ |
| DO_UPCAST(type, gic, FROM_SYSBUS(gic_state, dev)) |
| |
| typedef struct gic_irq_state |
| { |
| /* The enable bits are only banked for per-cpu interrupts. */ |
| unsigned enabled:NCPU; |
| unsigned pending:NCPU; |
| unsigned active:NCPU; |
| unsigned level:NCPU; |
| unsigned model:1; /* 0 = N:N, 1 = 1:N */ |
| unsigned trigger:1; /* nonzero = edge triggered. */ |
| } gic_irq_state; |
| |
| #define ALL_CPU_MASK ((1 << NCPU) - 1) |
| #if NCPU > 1 |
| #define NUM_CPU(s) ((s)->num_cpu) |
| #else |
| #define NUM_CPU(s) 1 |
| #endif |
| |
| #define GIC_SET_ENABLED(irq, cm) s->irq_state[irq].enabled |= (cm) |
| #define GIC_CLEAR_ENABLED(irq, cm) s->irq_state[irq].enabled &= ~(cm) |
| #define GIC_TEST_ENABLED(irq, cm) ((s->irq_state[irq].enabled & (cm)) != 0) |
| #define GIC_SET_PENDING(irq, cm) s->irq_state[irq].pending |= (cm) |
| #define GIC_CLEAR_PENDING(irq, cm) s->irq_state[irq].pending &= ~(cm) |
| #define GIC_TEST_PENDING(irq, cm) ((s->irq_state[irq].pending & (cm)) != 0) |
| #define GIC_SET_ACTIVE(irq, cm) s->irq_state[irq].active |= (cm) |
| #define GIC_CLEAR_ACTIVE(irq, cm) s->irq_state[irq].active &= ~(cm) |
| #define GIC_TEST_ACTIVE(irq, cm) ((s->irq_state[irq].active & (cm)) != 0) |
| #define GIC_SET_MODEL(irq) s->irq_state[irq].model = 1 |
| #define GIC_CLEAR_MODEL(irq) s->irq_state[irq].model = 0 |
| #define GIC_TEST_MODEL(irq) s->irq_state[irq].model |
| #define GIC_SET_LEVEL(irq, cm) s->irq_state[irq].level = (cm) |
| #define GIC_CLEAR_LEVEL(irq, cm) s->irq_state[irq].level &= ~(cm) |
| #define GIC_TEST_LEVEL(irq, cm) ((s->irq_state[irq].level & (cm)) != 0) |
| #define GIC_SET_TRIGGER(irq) s->irq_state[irq].trigger = 1 |
| #define GIC_CLEAR_TRIGGER(irq) s->irq_state[irq].trigger = 0 |
| #define GIC_TEST_TRIGGER(irq) s->irq_state[irq].trigger |
| #define GIC_GET_PRIORITY(irq, cpu) (((irq) < GIC_INTERNAL) ? \ |
| s->priority1[irq][cpu] : \ |
| s->priority2[(irq) - GIC_INTERNAL]) |
| #ifdef NVIC |
| #define GIC_TARGET(irq) 1 |
| #else |
| #define GIC_TARGET(irq) s->irq_target[irq] |
| #endif |
| |
| typedef struct gic_state |
| { |
| SysBusDevice busdev; |
| qemu_irq parent_irq[NCPU]; |
| int enabled; |
| int cpu_enabled[NCPU]; |
| |
| gic_irq_state irq_state[GIC_MAXIRQ]; |
| #ifndef NVIC |
| int irq_target[GIC_MAXIRQ]; |
| #endif |
| int priority1[GIC_INTERNAL][NCPU]; |
| int priority2[GIC_MAXIRQ - GIC_INTERNAL]; |
| int last_active[GIC_MAXIRQ][NCPU]; |
| |
| int priority_mask[NCPU]; |
| int running_irq[NCPU]; |
| int running_priority[NCPU]; |
| int current_pending[NCPU]; |
| |
| #if NCPU > 1 |
| int num_cpu; |
| #endif |
| |
| MemoryRegion iomem; /* Distributor */ |
| #ifndef NVIC |
| /* This is just so we can have an opaque pointer which identifies |
| * both this GIC and which CPU interface we should be accessing. |
| */ |
| struct gic_state *backref[NCPU]; |
| MemoryRegion cpuiomem[NCPU+1]; /* CPU interfaces */ |
| #endif |
| uint32_t num_irq; |
| } gic_state; |
| |
| /* TODO: Many places that call this routine could be optimized. */ |
| /* Update interrupt status after enabled or pending bits have been changed. */ |
| static void gic_update(gic_state *s) |
| { |
| int best_irq; |
| int best_prio; |
| int irq; |
| int level; |
| int cpu; |
| int cm; |
| |
| for (cpu = 0; cpu < NUM_CPU(s); cpu++) { |
| cm = 1 << cpu; |
| s->current_pending[cpu] = 1023; |
| if (!s->enabled || !s->cpu_enabled[cpu]) { |
| qemu_irq_lower(s->parent_irq[cpu]); |
| return; |
| } |
| best_prio = 0x100; |
| best_irq = 1023; |
| for (irq = 0; irq < s->num_irq; irq++) { |
| if (GIC_TEST_ENABLED(irq, cm) && GIC_TEST_PENDING(irq, cm)) { |
| if (GIC_GET_PRIORITY(irq, cpu) < best_prio) { |
| best_prio = GIC_GET_PRIORITY(irq, cpu); |
| best_irq = irq; |
| } |
| } |
| } |
| level = 0; |
| if (best_prio <= s->priority_mask[cpu]) { |
| s->current_pending[cpu] = best_irq; |
| if (best_prio < s->running_priority[cpu]) { |
| DPRINTF("Raised pending IRQ %d\n", best_irq); |
| level = 1; |
| } |
| } |
| qemu_set_irq(s->parent_irq[cpu], level); |
| } |
| } |
| |
| static void __attribute__((unused)) |
| gic_set_pending_private(gic_state *s, int cpu, int irq) |
| { |
| int cm = 1 << cpu; |
| |
| if (GIC_TEST_PENDING(irq, cm)) |
| return; |
| |
| DPRINTF("Set %d pending cpu %d\n", irq, cpu); |
| GIC_SET_PENDING(irq, cm); |
| gic_update(s); |
| } |
| |
| /* Process a change in an external IRQ input. */ |
| static void gic_set_irq(void *opaque, int irq, int level) |
| { |
| gic_state *s = (gic_state *)opaque; |
| /* The first external input line is internal interrupt 32. */ |
| irq += GIC_INTERNAL; |
| if (level == GIC_TEST_LEVEL(irq, ALL_CPU_MASK)) |
| return; |
| |
| if (level) { |
| GIC_SET_LEVEL(irq, ALL_CPU_MASK); |
| if (GIC_TEST_TRIGGER(irq) || GIC_TEST_ENABLED(irq, ALL_CPU_MASK)) { |
| DPRINTF("Set %d pending mask %x\n", irq, GIC_TARGET(irq)); |
| GIC_SET_PENDING(irq, GIC_TARGET(irq)); |
| } |
| } else { |
| GIC_CLEAR_LEVEL(irq, ALL_CPU_MASK); |
| } |
| gic_update(s); |
| } |
| |
| static void gic_set_running_irq(gic_state *s, int cpu, int irq) |
| { |
| s->running_irq[cpu] = irq; |
| if (irq == 1023) { |
| s->running_priority[cpu] = 0x100; |
| } else { |
| s->running_priority[cpu] = GIC_GET_PRIORITY(irq, cpu); |
| } |
| gic_update(s); |
| } |
| |
| static uint32_t gic_acknowledge_irq(gic_state *s, int cpu) |
| { |
| int new_irq; |
| int cm = 1 << cpu; |
| new_irq = s->current_pending[cpu]; |
| if (new_irq == 1023 |
| || GIC_GET_PRIORITY(new_irq, cpu) >= s->running_priority[cpu]) { |
| DPRINTF("ACK no pending IRQ\n"); |
| return 1023; |
| } |
| s->last_active[new_irq][cpu] = s->running_irq[cpu]; |
| /* Clear pending flags for both level and edge triggered interrupts. |
| Level triggered IRQs will be reasserted once they become inactive. */ |
| GIC_CLEAR_PENDING(new_irq, GIC_TEST_MODEL(new_irq) ? ALL_CPU_MASK : cm); |
| gic_set_running_irq(s, cpu, new_irq); |
| DPRINTF("ACK %d\n", new_irq); |
| return new_irq; |
| } |
| |
| static void gic_complete_irq(gic_state * s, int cpu, int irq) |
| { |
| int update = 0; |
| int cm = 1 << cpu; |
| DPRINTF("EOI %d\n", irq); |
| if (irq >= s->num_irq) { |
| /* This handles two cases: |
| * 1. If software writes the ID of a spurious interrupt [ie 1023] |
| * to the GICC_EOIR, the GIC ignores that write. |
| * 2. If software writes the number of a non-existent interrupt |
| * this must be a subcase of "value written does not match the last |
| * valid interrupt value read from the Interrupt Acknowledge |
| * register" and so this is UNPREDICTABLE. We choose to ignore it. |
| */ |
| return; |
| } |
| if (s->running_irq[cpu] == 1023) |
| return; /* No active IRQ. */ |
| /* Mark level triggered interrupts as pending if they are still |
| raised. */ |
| if (!GIC_TEST_TRIGGER(irq) && GIC_TEST_ENABLED(irq, cm) |
| && GIC_TEST_LEVEL(irq, cm) && (GIC_TARGET(irq) & cm) != 0) { |
| DPRINTF("Set %d pending mask %x\n", irq, cm); |
| GIC_SET_PENDING(irq, cm); |
| update = 1; |
| } |
| if (irq != s->running_irq[cpu]) { |
| /* Complete an IRQ that is not currently running. */ |
| int tmp = s->running_irq[cpu]; |
| while (s->last_active[tmp][cpu] != 1023) { |
| if (s->last_active[tmp][cpu] == irq) { |
| s->last_active[tmp][cpu] = s->last_active[irq][cpu]; |
| break; |
| } |
| tmp = s->last_active[tmp][cpu]; |
| } |
| if (update) { |
| gic_update(s); |
| } |
| } else { |
| /* Complete the current running IRQ. */ |
| gic_set_running_irq(s, cpu, s->last_active[s->running_irq[cpu]][cpu]); |
| } |
| } |
| |
| static uint32_t gic_dist_readb(void *opaque, target_phys_addr_t offset) |
| { |
| gic_state *s = (gic_state *)opaque; |
| uint32_t res; |
| int irq; |
| int i; |
| int cpu; |
| int cm; |
| int mask; |
| |
| cpu = gic_get_current_cpu(); |
| cm = 1 << cpu; |
| if (offset < 0x100) { |
| #ifndef NVIC |
| if (offset == 0) |
| return s->enabled; |
| if (offset == 4) |
| return ((s->num_irq / 32) - 1) | ((NUM_CPU(s) - 1) << 5); |
| if (offset < 0x08) |
| return 0; |
| if (offset >= 0x80) { |
| /* Interrupt Security , RAZ/WI */ |
| return 0; |
| } |
| #endif |
| goto bad_reg; |
| } else if (offset < 0x200) { |
| /* Interrupt Set/Clear Enable. */ |
| if (offset < 0x180) |
| irq = (offset - 0x100) * 8; |
| else |
| irq = (offset - 0x180) * 8; |
| irq += GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| res = 0; |
| for (i = 0; i < 8; i++) { |
| if (GIC_TEST_ENABLED(irq + i, cm)) { |
| res |= (1 << i); |
| } |
| } |
| } else if (offset < 0x300) { |
| /* Interrupt Set/Clear Pending. */ |
| if (offset < 0x280) |
| irq = (offset - 0x200) * 8; |
| else |
| irq = (offset - 0x280) * 8; |
| irq += GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| res = 0; |
| mask = (irq < GIC_INTERNAL) ? cm : ALL_CPU_MASK; |
| for (i = 0; i < 8; i++) { |
| if (GIC_TEST_PENDING(irq + i, mask)) { |
| res |= (1 << i); |
| } |
| } |
| } else if (offset < 0x400) { |
| /* Interrupt Active. */ |
| irq = (offset - 0x300) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| res = 0; |
| mask = (irq < GIC_INTERNAL) ? cm : ALL_CPU_MASK; |
| for (i = 0; i < 8; i++) { |
| if (GIC_TEST_ACTIVE(irq + i, mask)) { |
| res |= (1 << i); |
| } |
| } |
| } else if (offset < 0x800) { |
| /* Interrupt Priority. */ |
| irq = (offset - 0x400) + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| res = GIC_GET_PRIORITY(irq, cpu); |
| #ifndef NVIC |
| } else if (offset < 0xc00) { |
| /* Interrupt CPU Target. */ |
| irq = (offset - 0x800) + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq >= 29 && irq <= 31) { |
| res = cm; |
| } else { |
| res = GIC_TARGET(irq); |
| } |
| } else if (offset < 0xf00) { |
| /* Interrupt Configuration. */ |
| irq = (offset - 0xc00) * 2 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| res = 0; |
| for (i = 0; i < 4; i++) { |
| if (GIC_TEST_MODEL(irq + i)) |
| res |= (1 << (i * 2)); |
| if (GIC_TEST_TRIGGER(irq + i)) |
| res |= (2 << (i * 2)); |
| } |
| #endif |
| } else if (offset < 0xfe0) { |
| goto bad_reg; |
| } else /* offset >= 0xfe0 */ { |
| if (offset & 3) { |
| res = 0; |
| } else { |
| res = gic_id[(offset - 0xfe0) >> 2]; |
| } |
| } |
| return res; |
| bad_reg: |
| hw_error("gic_dist_readb: Bad offset %x\n", (int)offset); |
| return 0; |
| } |
| |
| static uint32_t gic_dist_readw(void *opaque, target_phys_addr_t offset) |
| { |
| uint32_t val; |
| val = gic_dist_readb(opaque, offset); |
| val |= gic_dist_readb(opaque, offset + 1) << 8; |
| return val; |
| } |
| |
| static uint32_t gic_dist_readl(void *opaque, target_phys_addr_t offset) |
| { |
| uint32_t val; |
| #ifdef NVIC |
| gic_state *s = (gic_state *)opaque; |
| uint32_t addr; |
| addr = offset; |
| if (addr < 0x100 || addr > 0xd00) |
| return nvic_readl(s, addr); |
| #endif |
| val = gic_dist_readw(opaque, offset); |
| val |= gic_dist_readw(opaque, offset + 2) << 16; |
| return val; |
| } |
| |
| static void gic_dist_writeb(void *opaque, target_phys_addr_t offset, |
| uint32_t value) |
| { |
| gic_state *s = (gic_state *)opaque; |
| int irq; |
| int i; |
| int cpu; |
| |
| cpu = gic_get_current_cpu(); |
| if (offset < 0x100) { |
| #ifdef NVIC |
| goto bad_reg; |
| #else |
| if (offset == 0) { |
| s->enabled = (value & 1); |
| DPRINTF("Distribution %sabled\n", s->enabled ? "En" : "Dis"); |
| } else if (offset < 4) { |
| /* ignored. */ |
| } else if (offset >= 0x80) { |
| /* Interrupt Security Registers, RAZ/WI */ |
| } else { |
| goto bad_reg; |
| } |
| #endif |
| } else if (offset < 0x180) { |
| /* Interrupt Set Enable. */ |
| irq = (offset - 0x100) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < 16) |
| value = 0xff; |
| for (i = 0; i < 8; i++) { |
| if (value & (1 << i)) { |
| int mask = (irq < GIC_INTERNAL) ? (1 << cpu) : GIC_TARGET(irq); |
| int cm = (irq < GIC_INTERNAL) ? (1 << cpu) : ALL_CPU_MASK; |
| |
| if (!GIC_TEST_ENABLED(irq + i, cm)) { |
| DPRINTF("Enabled IRQ %d\n", irq + i); |
| } |
| GIC_SET_ENABLED(irq + i, cm); |
| /* If a raised level triggered IRQ enabled then mark |
| is as pending. */ |
| if (GIC_TEST_LEVEL(irq + i, mask) |
| && !GIC_TEST_TRIGGER(irq + i)) { |
| DPRINTF("Set %d pending mask %x\n", irq + i, mask); |
| GIC_SET_PENDING(irq + i, mask); |
| } |
| } |
| } |
| } else if (offset < 0x200) { |
| /* Interrupt Clear Enable. */ |
| irq = (offset - 0x180) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < 16) |
| value = 0; |
| for (i = 0; i < 8; i++) { |
| if (value & (1 << i)) { |
| int cm = (irq < GIC_INTERNAL) ? (1 << cpu) : ALL_CPU_MASK; |
| |
| if (GIC_TEST_ENABLED(irq + i, cm)) { |
| DPRINTF("Disabled IRQ %d\n", irq + i); |
| } |
| GIC_CLEAR_ENABLED(irq + i, cm); |
| } |
| } |
| } else if (offset < 0x280) { |
| /* Interrupt Set Pending. */ |
| irq = (offset - 0x200) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < 16) |
| irq = 0; |
| |
| for (i = 0; i < 8; i++) { |
| if (value & (1 << i)) { |
| GIC_SET_PENDING(irq + i, GIC_TARGET(irq)); |
| } |
| } |
| } else if (offset < 0x300) { |
| /* Interrupt Clear Pending. */ |
| irq = (offset - 0x280) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| for (i = 0; i < 8; i++) { |
| /* ??? This currently clears the pending bit for all CPUs, even |
| for per-CPU interrupts. It's unclear whether this is the |
| corect behavior. */ |
| if (value & (1 << i)) { |
| GIC_CLEAR_PENDING(irq + i, ALL_CPU_MASK); |
| } |
| } |
| } else if (offset < 0x400) { |
| /* Interrupt Active. */ |
| goto bad_reg; |
| } else if (offset < 0x800) { |
| /* Interrupt Priority. */ |
| irq = (offset - 0x400) + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < GIC_INTERNAL) { |
| s->priority1[irq][cpu] = value; |
| } else { |
| s->priority2[irq - GIC_INTERNAL] = value; |
| } |
| #ifndef NVIC |
| } else if (offset < 0xc00) { |
| /* Interrupt CPU Target. */ |
| irq = (offset - 0x800) + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < 29) |
| value = 0; |
| else if (irq < GIC_INTERNAL) |
| value = ALL_CPU_MASK; |
| s->irq_target[irq] = value & ALL_CPU_MASK; |
| } else if (offset < 0xf00) { |
| /* Interrupt Configuration. */ |
| irq = (offset - 0xc00) * 4 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < GIC_INTERNAL) |
| value |= 0xaa; |
| for (i = 0; i < 4; i++) { |
| if (value & (1 << (i * 2))) { |
| GIC_SET_MODEL(irq + i); |
| } else { |
| GIC_CLEAR_MODEL(irq + i); |
| } |
| if (value & (2 << (i * 2))) { |
| GIC_SET_TRIGGER(irq + i); |
| } else { |
| GIC_CLEAR_TRIGGER(irq + i); |
| } |
| } |
| #endif |
| } else { |
| /* 0xf00 is only handled for 32-bit writes. */ |
| goto bad_reg; |
| } |
| gic_update(s); |
| return; |
| bad_reg: |
| hw_error("gic_dist_writeb: Bad offset %x\n", (int)offset); |
| } |
| |
| static void gic_dist_writew(void *opaque, target_phys_addr_t offset, |
| uint32_t value) |
| { |
| gic_dist_writeb(opaque, offset, value & 0xff); |
| gic_dist_writeb(opaque, offset + 1, value >> 8); |
| } |
| |
| static void gic_dist_writel(void *opaque, target_phys_addr_t offset, |
| uint32_t value) |
| { |
| gic_state *s = (gic_state *)opaque; |
| #ifdef NVIC |
| uint32_t addr; |
| addr = offset; |
| if (addr < 0x100 || (addr > 0xd00 && addr != 0xf00)) { |
| nvic_writel(s, addr, value); |
| return; |
| } |
| #endif |
| if (offset == 0xf00) { |
| int cpu; |
| int irq; |
| int mask; |
| |
| cpu = gic_get_current_cpu(); |
| irq = value & 0x3ff; |
| switch ((value >> 24) & 3) { |
| case 0: |
| mask = (value >> 16) & ALL_CPU_MASK; |
| break; |
| case 1: |
| mask = ALL_CPU_MASK ^ (1 << cpu); |
| break; |
| case 2: |
| mask = 1 << cpu; |
| break; |
| default: |
| DPRINTF("Bad Soft Int target filter\n"); |
| mask = ALL_CPU_MASK; |
| break; |
| } |
| GIC_SET_PENDING(irq, mask); |
| gic_update(s); |
| return; |
| } |
| gic_dist_writew(opaque, offset, value & 0xffff); |
| gic_dist_writew(opaque, offset + 2, value >> 16); |
| } |
| |
| static const MemoryRegionOps gic_dist_ops = { |
| .old_mmio = { |
| .read = { gic_dist_readb, gic_dist_readw, gic_dist_readl, }, |
| .write = { gic_dist_writeb, gic_dist_writew, gic_dist_writel, }, |
| }, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| #ifndef NVIC |
| static uint32_t gic_cpu_read(gic_state *s, int cpu, int offset) |
| { |
| switch (offset) { |
| case 0x00: /* Control */ |
| return s->cpu_enabled[cpu]; |
| case 0x04: /* Priority mask */ |
| return s->priority_mask[cpu]; |
| case 0x08: /* Binary Point */ |
| /* ??? Not implemented. */ |
| return 0; |
| case 0x0c: /* Acknowledge */ |
| return gic_acknowledge_irq(s, cpu); |
| case 0x14: /* Running Priority */ |
| return s->running_priority[cpu]; |
| case 0x18: /* Highest Pending Interrupt */ |
| return s->current_pending[cpu]; |
| default: |
| hw_error("gic_cpu_read: Bad offset %x\n", (int)offset); |
| return 0; |
| } |
| } |
| |
| static void gic_cpu_write(gic_state *s, int cpu, int offset, uint32_t value) |
| { |
| switch (offset) { |
| case 0x00: /* Control */ |
| s->cpu_enabled[cpu] = (value & 1); |
| DPRINTF("CPU %d %sabled\n", cpu, s->cpu_enabled ? "En" : "Dis"); |
| break; |
| case 0x04: /* Priority mask */ |
| s->priority_mask[cpu] = (value & 0xff); |
| break; |
| case 0x08: /* Binary Point */ |
| /* ??? Not implemented. */ |
| break; |
| case 0x10: /* End Of Interrupt */ |
| return gic_complete_irq(s, cpu, value & 0x3ff); |
| default: |
| hw_error("gic_cpu_write: Bad offset %x\n", (int)offset); |
| return; |
| } |
| gic_update(s); |
| } |
| |
| /* Wrappers to read/write the GIC CPU interface for the current CPU */ |
| static uint64_t gic_thiscpu_read(void *opaque, target_phys_addr_t addr, |
| unsigned size) |
| { |
| gic_state *s = (gic_state *)opaque; |
| return gic_cpu_read(s, gic_get_current_cpu(), addr); |
| } |
| |
| static void gic_thiscpu_write(void *opaque, target_phys_addr_t addr, |
| uint64_t value, unsigned size) |
| { |
| gic_state *s = (gic_state *)opaque; |
| gic_cpu_write(s, gic_get_current_cpu(), addr, value); |
| } |
| |
| /* Wrappers to read/write the GIC CPU interface for a specific CPU. |
| * These just decode the opaque pointer into gic_state* + cpu id. |
| */ |
| static uint64_t gic_do_cpu_read(void *opaque, target_phys_addr_t addr, |
| unsigned size) |
| { |
| gic_state **backref = (gic_state **)opaque; |
| gic_state *s = *backref; |
| int id = (backref - s->backref); |
| return gic_cpu_read(s, id, addr); |
| } |
| |
| static void gic_do_cpu_write(void *opaque, target_phys_addr_t addr, |
| uint64_t value, unsigned size) |
| { |
| gic_state **backref = (gic_state **)opaque; |
| gic_state *s = *backref; |
| int id = (backref - s->backref); |
| gic_cpu_write(s, id, addr, value); |
| } |
| |
| static const MemoryRegionOps gic_thiscpu_ops = { |
| .read = gic_thiscpu_read, |
| .write = gic_thiscpu_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| static const MemoryRegionOps gic_cpu_ops = { |
| .read = gic_do_cpu_read, |
| .write = gic_do_cpu_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| #endif |
| |
| static void gic_reset(gic_state *s) |
| { |
| int i; |
| memset(s->irq_state, 0, GIC_MAXIRQ * sizeof(gic_irq_state)); |
| for (i = 0 ; i < NUM_CPU(s); i++) { |
| s->priority_mask[i] = 0xf0; |
| s->current_pending[i] = 1023; |
| s->running_irq[i] = 1023; |
| s->running_priority[i] = 0x100; |
| #ifdef NVIC |
| /* The NVIC doesn't have per-cpu interfaces, so enable by default. */ |
| s->cpu_enabled[i] = 1; |
| #else |
| s->cpu_enabled[i] = 0; |
| #endif |
| } |
| for (i = 0; i < 16; i++) { |
| GIC_SET_ENABLED(i, ALL_CPU_MASK); |
| GIC_SET_TRIGGER(i); |
| } |
| #ifdef NVIC |
| /* The NVIC is always enabled. */ |
| s->enabled = 1; |
| #else |
| s->enabled = 0; |
| #endif |
| } |
| |
| static void gic_save(QEMUFile *f, void *opaque) |
| { |
| gic_state *s = (gic_state *)opaque; |
| int i; |
| int j; |
| |
| qemu_put_be32(f, s->enabled); |
| for (i = 0; i < NUM_CPU(s); i++) { |
| qemu_put_be32(f, s->cpu_enabled[i]); |
| for (j = 0; j < GIC_INTERNAL; j++) |
| qemu_put_be32(f, s->priority1[j][i]); |
| for (j = 0; j < s->num_irq; j++) |
| qemu_put_be32(f, s->last_active[j][i]); |
| qemu_put_be32(f, s->priority_mask[i]); |
| qemu_put_be32(f, s->running_irq[i]); |
| qemu_put_be32(f, s->running_priority[i]); |
| qemu_put_be32(f, s->current_pending[i]); |
| } |
| for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) { |
| qemu_put_be32(f, s->priority2[i]); |
| } |
| for (i = 0; i < s->num_irq; i++) { |
| #ifndef NVIC |
| qemu_put_be32(f, s->irq_target[i]); |
| #endif |
| qemu_put_byte(f, s->irq_state[i].enabled); |
| qemu_put_byte(f, s->irq_state[i].pending); |
| qemu_put_byte(f, s->irq_state[i].active); |
| qemu_put_byte(f, s->irq_state[i].level); |
| qemu_put_byte(f, s->irq_state[i].model); |
| qemu_put_byte(f, s->irq_state[i].trigger); |
| } |
| } |
| |
| static int gic_load(QEMUFile *f, void *opaque, int version_id) |
| { |
| gic_state *s = (gic_state *)opaque; |
| int i; |
| int j; |
| |
| if (version_id != 2) |
| return -EINVAL; |
| |
| s->enabled = qemu_get_be32(f); |
| for (i = 0; i < NUM_CPU(s); i++) { |
| s->cpu_enabled[i] = qemu_get_be32(f); |
| for (j = 0; j < GIC_INTERNAL; j++) |
| s->priority1[j][i] = qemu_get_be32(f); |
| for (j = 0; j < s->num_irq; j++) |
| s->last_active[j][i] = qemu_get_be32(f); |
| s->priority_mask[i] = qemu_get_be32(f); |
| s->running_irq[i] = qemu_get_be32(f); |
| s->running_priority[i] = qemu_get_be32(f); |
| s->current_pending[i] = qemu_get_be32(f); |
| } |
| for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) { |
| s->priority2[i] = qemu_get_be32(f); |
| } |
| for (i = 0; i < s->num_irq; i++) { |
| #ifndef NVIC |
| s->irq_target[i] = qemu_get_be32(f); |
| #endif |
| s->irq_state[i].enabled = qemu_get_byte(f); |
| s->irq_state[i].pending = qemu_get_byte(f); |
| s->irq_state[i].active = qemu_get_byte(f); |
| s->irq_state[i].level = qemu_get_byte(f); |
| s->irq_state[i].model = qemu_get_byte(f); |
| s->irq_state[i].trigger = qemu_get_byte(f); |
| } |
| |
| return 0; |
| } |
| |
| #if NCPU > 1 |
| static void gic_init(gic_state *s, int num_cpu, int num_irq) |
| #else |
| static void gic_init(gic_state *s, int num_irq) |
| #endif |
| { |
| int i; |
| |
| #if NCPU > 1 |
| s->num_cpu = num_cpu; |
| #endif |
| s->num_irq = num_irq + GIC_BASE_IRQ; |
| if (s->num_irq > GIC_MAXIRQ) { |
| hw_error("requested %u interrupt lines exceeds GIC maximum %d\n", |
| num_irq, GIC_MAXIRQ); |
| } |
| /* ITLinesNumber is represented as (N / 32) - 1 (see |
| * gic_dist_readb) so this is an implementation imposed |
| * restriction, not an architectural one: |
| */ |
| if (s->num_irq < 32 || (s->num_irq % 32)) { |
| hw_error("%d interrupt lines unsupported: not divisible by 32\n", |
| num_irq); |
| } |
| |
| qdev_init_gpio_in(&s->busdev.qdev, gic_set_irq, s->num_irq - GIC_INTERNAL); |
| for (i = 0; i < NUM_CPU(s); i++) { |
| sysbus_init_irq(&s->busdev, &s->parent_irq[i]); |
| } |
| memory_region_init_io(&s->iomem, &gic_dist_ops, s, "gic_dist", 0x1000); |
| #ifndef NVIC |
| /* Memory regions for the CPU interfaces (NVIC doesn't have these): |
| * a region for "CPU interface for this core", then a region for |
| * "CPU interface for core 0", "for core 1", ... |
| * NB that the memory region size of 0x100 applies for the 11MPCore |
| * and also cores following the GIC v1 spec (ie A9). |
| * GIC v2 defines a larger memory region (0x1000) so this will need |
| * to be extended when we implement A15. |
| */ |
| memory_region_init_io(&s->cpuiomem[0], &gic_thiscpu_ops, s, |
| "gic_cpu", 0x100); |
| for (i = 0; i < NUM_CPU(s); i++) { |
| s->backref[i] = s; |
| memory_region_init_io(&s->cpuiomem[i+1], &gic_cpu_ops, &s->backref[i], |
| "gic_cpu", 0x100); |
| } |
| #endif |
| |
| gic_reset(s); |
| register_savevm(NULL, "arm_gic", -1, 2, gic_save, gic_load, s); |
| } |
