| /* |
| * 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. |
| * It is compiled in two ways: |
| * (1) as a standalone file to produce a sysbus device which is a GIC |
| * that can be used on the realview board and as one of the builtin |
| * private peripherals for the ARM MP CPUs (11MPCore, A9, etc) |
| * (2) by being directly #included into armv7m_nvic.c to produce the |
| * armv7m_nvic device. |
| */ |
| |
| #include "hw/sysbus.h" |
| #include "gic_internal.h" |
| #include "qom/cpu.h" |
| |
| //#define DEBUG_GIC |
| |
| #ifdef DEBUG_GIC |
| #define DPRINTF(fmt, ...) \ |
| do { fprintf(stderr, "arm_gic: " fmt , ## __VA_ARGS__); } while (0) |
| #else |
| #define DPRINTF(fmt, ...) do {} while(0) |
| #endif |
| |
| static const uint8_t gic_id[] = { |
| 0x90, 0x13, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 |
| }; |
| |
| #define NUM_CPU(s) ((s)->num_cpu) |
| |
| static inline int gic_get_current_cpu(GICState *s) |
| { |
| if (s->num_cpu > 1) { |
| return current_cpu->cpu_index; |
| } |
| return 0; |
| } |
| |
| /* TODO: Many places that call this routine could be optimized. */ |
| /* Update interrupt status after enabled or pending bits have been changed. */ |
| void gic_update(GICState *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(s, 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 (cpu %d)\n", best_irq, cpu); |
| level = 1; |
| } |
| } |
| qemu_set_irq(s->parent_irq[cpu], level); |
| } |
| } |
| |
| void gic_set_pending_private(GICState *s, int cpu, int irq) |
| { |
| int cm = 1 << cpu; |
| |
| if (gic_test_pending(s, irq, cm)) { |
| return; |
| } |
| |
| DPRINTF("Set %d pending cpu %d\n", irq, cpu); |
| GIC_SET_PENDING(irq, cm); |
| gic_update(s); |
| } |
| |
| static void gic_set_irq_11mpcore(GICState *s, int irq, int level, |
| int cm, int target) |
| { |
| if (level) { |
| GIC_SET_LEVEL(irq, cm); |
| if (GIC_TEST_EDGE_TRIGGER(irq) || GIC_TEST_ENABLED(irq, cm)) { |
| DPRINTF("Set %d pending mask %x\n", irq, target); |
| GIC_SET_PENDING(irq, target); |
| } |
| } else { |
| GIC_CLEAR_LEVEL(irq, cm); |
| } |
| } |
| |
| static void gic_set_irq_generic(GICState *s, int irq, int level, |
| int cm, int target) |
| { |
| if (level) { |
| GIC_SET_LEVEL(irq, cm); |
| DPRINTF("Set %d pending mask %x\n", irq, target); |
| if (GIC_TEST_EDGE_TRIGGER(irq)) { |
| GIC_SET_PENDING(irq, target); |
| } |
| } else { |
| GIC_CLEAR_LEVEL(irq, cm); |
| } |
| } |
| |
| /* Process a change in an external IRQ input. */ |
| static void gic_set_irq(void *opaque, int irq, int level) |
| { |
| /* Meaning of the 'irq' parameter: |
| * [0..N-1] : external interrupts |
| * [N..N+31] : PPI (internal) interrupts for CPU 0 |
| * [N+32..N+63] : PPI (internal interrupts for CPU 1 |
| * ... |
| */ |
| GICState *s = (GICState *)opaque; |
| int cm, target; |
| if (irq < (s->num_irq - GIC_INTERNAL)) { |
| /* The first external input line is internal interrupt 32. */ |
| cm = ALL_CPU_MASK; |
| irq += GIC_INTERNAL; |
| target = GIC_TARGET(irq); |
| } else { |
| int cpu; |
| irq -= (s->num_irq - GIC_INTERNAL); |
| cpu = irq / GIC_INTERNAL; |
| irq %= GIC_INTERNAL; |
| cm = 1 << cpu; |
| target = cm; |
| } |
| |
| assert(irq >= GIC_NR_SGIS); |
| |
| if (level == GIC_TEST_LEVEL(irq, cm)) { |
| return; |
| } |
| |
| if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) { |
| gic_set_irq_11mpcore(s, irq, level, cm, target); |
| } else { |
| gic_set_irq_generic(s, irq, level, cm, target); |
| } |
| |
| gic_update(s); |
| } |
| |
| static void gic_set_running_irq(GICState *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); |
| } |
| |
| uint32_t gic_acknowledge_irq(GICState *s, int cpu) |
| { |
| int ret, irq, src; |
| int cm = 1 << cpu; |
| irq = s->current_pending[cpu]; |
| if (irq == 1023 |
| || GIC_GET_PRIORITY(irq, cpu) >= s->running_priority[cpu]) { |
| DPRINTF("ACK no pending IRQ\n"); |
| return 1023; |
| } |
| s->last_active[irq][cpu] = s->running_irq[cpu]; |
| |
| if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) { |
| /* Clear pending flags for both level and edge triggered interrupts. |
| * Level triggered IRQs will be reasserted once they become inactive. |
| */ |
| GIC_CLEAR_PENDING(irq, GIC_TEST_MODEL(irq) ? ALL_CPU_MASK : cm); |
| ret = irq; |
| } else { |
| if (irq < GIC_NR_SGIS) { |
| /* Lookup the source CPU for the SGI and clear this in the |
| * sgi_pending map. Return the src and clear the overall pending |
| * state on this CPU if the SGI is not pending from any CPUs. |
| */ |
| assert(s->sgi_pending[irq][cpu] != 0); |
| src = ctz32(s->sgi_pending[irq][cpu]); |
| s->sgi_pending[irq][cpu] &= ~(1 << src); |
| if (s->sgi_pending[irq][cpu] == 0) { |
| GIC_CLEAR_PENDING(irq, GIC_TEST_MODEL(irq) ? ALL_CPU_MASK : cm); |
| } |
| ret = irq | ((src & 0x7) << 10); |
| } else { |
| /* Clear pending state for both level and edge triggered |
| * interrupts. (level triggered interrupts with an active line |
| * remain pending, see gic_test_pending) |
| */ |
| GIC_CLEAR_PENDING(irq, GIC_TEST_MODEL(irq) ? ALL_CPU_MASK : cm); |
| ret = irq; |
| } |
| } |
| |
| gic_set_running_irq(s, cpu, irq); |
| DPRINTF("ACK %d\n", irq); |
| return ret; |
| } |
| |
| void gic_set_priority(GICState *s, int cpu, int irq, uint8_t val) |
| { |
| if (irq < GIC_INTERNAL) { |
| s->priority1[irq][cpu] = val; |
| } else { |
| s->priority2[(irq) - GIC_INTERNAL] = val; |
| } |
| } |
| |
| void gic_complete_irq(GICState *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. */ |
| |
| if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) { |
| /* Mark level triggered interrupts as pending if they are still |
| raised. */ |
| if (!GIC_TEST_EDGE_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, hwaddr offset) |
| { |
| GICState *s = (GICState *)opaque; |
| uint32_t res; |
| int irq; |
| int i; |
| int cpu; |
| int cm; |
| int mask; |
| |
| cpu = gic_get_current_cpu(s); |
| cm = 1 << cpu; |
| if (offset < 0x100) { |
| 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; |
| } |
| 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(s, 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); |
| } else if (offset < 0xc00) { |
| /* Interrupt CPU Target. */ |
| if (s->num_cpu == 1 && s->revision != REV_11MPCORE) { |
| /* For uniprocessor GICs these RAZ/WI */ |
| res = 0; |
| } else { |
| 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_EDGE_TRIGGER(irq + i)) |
| res |= (2 << (i * 2)); |
| } |
| } else if (offset < 0xf10) { |
| goto bad_reg; |
| } else if (offset < 0xf30) { |
| if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) { |
| goto bad_reg; |
| } |
| |
| if (offset < 0xf20) { |
| /* GICD_CPENDSGIRn */ |
| irq = (offset - 0xf10); |
| } else { |
| irq = (offset - 0xf20); |
| /* GICD_SPENDSGIRn */ |
| } |
| |
| res = s->sgi_pending[irq][cpu]; |
| } 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: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "gic_dist_readb: Bad offset %x\n", (int)offset); |
| return 0; |
| } |
| |
| static uint32_t gic_dist_readw(void *opaque, hwaddr 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, hwaddr offset) |
| { |
| uint32_t val; |
| val = gic_dist_readw(opaque, offset); |
| val |= gic_dist_readw(opaque, offset + 2) << 16; |
| return val; |
| } |
| |
| static void gic_dist_writeb(void *opaque, hwaddr offset, |
| uint32_t value) |
| { |
| GICState *s = (GICState *)opaque; |
| int irq; |
| int i; |
| int cpu; |
| |
| cpu = gic_get_current_cpu(s); |
| if (offset < 0x100) { |
| 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; |
| } |
| } else if (offset < 0x180) { |
| /* Interrupt Set Enable. */ |
| irq = (offset - 0x100) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < GIC_NR_SGIS) { |
| value = 0xff; |
| } |
| |
| for (i = 0; i < 8; i++) { |
| if (value & (1 << i)) { |
| int mask = |
| (irq < GIC_INTERNAL) ? (1 << cpu) : GIC_TARGET(irq + i); |
| 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_EDGE_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 < GIC_NR_SGIS) { |
| 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 < GIC_NR_SGIS) { |
| value = 0; |
| } |
| |
| for (i = 0; i < 8; i++) { |
| if (value & (1 << i)) { |
| GIC_SET_PENDING(irq + i, GIC_TARGET(irq + i)); |
| } |
| } |
| } else if (offset < 0x300) { |
| /* Interrupt Clear Pending. */ |
| irq = (offset - 0x280) * 8 + GIC_BASE_IRQ; |
| if (irq >= s->num_irq) |
| goto bad_reg; |
| if (irq < GIC_NR_SGIS) { |
| value = 0; |
| } |
| |
| 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; |
| gic_set_priority(s, cpu, irq, value); |
| } else if (offset < 0xc00) { |
| /* Interrupt CPU Target. RAZ/WI on uniprocessor GICs, with the |
| * annoying exception of the 11MPCore's GIC. |
| */ |
| if (s->num_cpu != 1 || s->revision == REV_11MPCORE) { |
| 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_EDGE_TRIGGER(irq + i); |
| } else { |
| GIC_CLEAR_EDGE_TRIGGER(irq + i); |
| } |
| } |
| } else if (offset < 0xf10) { |
| /* 0xf00 is only handled for 32-bit writes. */ |
| goto bad_reg; |
| } else if (offset < 0xf20) { |
| /* GICD_CPENDSGIRn */ |
| if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) { |
| goto bad_reg; |
| } |
| irq = (offset - 0xf10); |
| |
| s->sgi_pending[irq][cpu] &= ~value; |
| if (s->sgi_pending[irq][cpu] == 0) { |
| GIC_CLEAR_PENDING(irq, 1 << cpu); |
| } |
| } else if (offset < 0xf30) { |
| /* GICD_SPENDSGIRn */ |
| if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) { |
| goto bad_reg; |
| } |
| irq = (offset - 0xf20); |
| |
| GIC_SET_PENDING(irq, 1 << cpu); |
| s->sgi_pending[irq][cpu] |= value; |
| } else { |
| goto bad_reg; |
| } |
| gic_update(s); |
| return; |
| bad_reg: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "gic_dist_writeb: Bad offset %x\n", (int)offset); |
| } |
| |
| static void gic_dist_writew(void *opaque, hwaddr 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, hwaddr offset, |
| uint32_t value) |
| { |
| GICState *s = (GICState *)opaque; |
| if (offset == 0xf00) { |
| int cpu; |
| int irq; |
| int mask; |
| int target_cpu; |
| |
| cpu = gic_get_current_cpu(s); |
| 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); |
| target_cpu = ctz32(mask); |
| while (target_cpu < GIC_NCPU) { |
| s->sgi_pending[irq][target_cpu] |= (1 << cpu); |
| mask &= ~(1 << target_cpu); |
| target_cpu = ctz32(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, |
| }; |
| |
| static uint32_t gic_cpu_read(GICState *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 */ |
| return s->bpr[cpu]; |
| 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]; |
| case 0x1c: /* Aliased Binary Point */ |
| return s->abpr[cpu]; |
| case 0xd0: case 0xd4: case 0xd8: case 0xdc: |
| return s->apr[(offset - 0xd0) / 4][cpu]; |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "gic_cpu_read: Bad offset %x\n", (int)offset); |
| return 0; |
| } |
| } |
| |
| static void gic_cpu_write(GICState *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[cpu] ? "En" : "Dis"); |
| break; |
| case 0x04: /* Priority mask */ |
| s->priority_mask[cpu] = (value & 0xff); |
| break; |
| case 0x08: /* Binary Point */ |
| s->bpr[cpu] = (value & 0x7); |
| break; |
| case 0x10: /* End Of Interrupt */ |
| return gic_complete_irq(s, cpu, value & 0x3ff); |
| case 0x1c: /* Aliased Binary Point */ |
| if (s->revision >= 2) { |
| s->abpr[cpu] = (value & 0x7); |
| } |
| break; |
| case 0xd0: case 0xd4: case 0xd8: case 0xdc: |
| qemu_log_mask(LOG_UNIMP, "Writing APR not implemented\n"); |
| break; |
| default: |
| qemu_log_mask(LOG_GUEST_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, hwaddr addr, |
| unsigned size) |
| { |
| GICState *s = (GICState *)opaque; |
| return gic_cpu_read(s, gic_get_current_cpu(s), addr); |
| } |
| |
| static void gic_thiscpu_write(void *opaque, hwaddr addr, |
| uint64_t value, unsigned size) |
| { |
| GICState *s = (GICState *)opaque; |
| gic_cpu_write(s, gic_get_current_cpu(s), addr, value); |
| } |
| |
| /* Wrappers to read/write the GIC CPU interface for a specific CPU. |
| * These just decode the opaque pointer into GICState* + cpu id. |
| */ |
| static uint64_t gic_do_cpu_read(void *opaque, hwaddr addr, |
| unsigned size) |
| { |
| GICState **backref = (GICState **)opaque; |
| GICState *s = *backref; |
| int id = (backref - s->backref); |
| return gic_cpu_read(s, id, addr); |
| } |
| |
| static void gic_do_cpu_write(void *opaque, hwaddr addr, |
| uint64_t value, unsigned size) |
| { |
| GICState **backref = (GICState **)opaque; |
| GICState *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, |
| }; |
| |
| void gic_init_irqs_and_distributor(GICState *s, int num_irq) |
| { |
| SysBusDevice *sbd = SYS_BUS_DEVICE(s); |
| int i; |
| |
| i = s->num_irq - GIC_INTERNAL; |
| /* For the GIC, also expose incoming GPIO lines for PPIs for each CPU. |
| * GPIO array layout is thus: |
| * [0..N-1] SPIs |
| * [N..N+31] PPIs for CPU 0 |
| * [N+32..N+63] PPIs for CPU 1 |
| * ... |
| */ |
| if (s->revision != REV_NVIC) { |
| i += (GIC_INTERNAL * s->num_cpu); |
| } |
| qdev_init_gpio_in(DEVICE(s), gic_set_irq, i); |
| for (i = 0; i < NUM_CPU(s); i++) { |
| sysbus_init_irq(sbd, &s->parent_irq[i]); |
| } |
| memory_region_init_io(&s->iomem, OBJECT(s), &gic_dist_ops, s, |
| "gic_dist", 0x1000); |
| } |
| |
| static void arm_gic_realize(DeviceState *dev, Error **errp) |
| { |
| /* Device instance realize function for the GIC sysbus device */ |
| int i; |
| GICState *s = ARM_GIC(dev); |
| SysBusDevice *sbd = SYS_BUS_DEVICE(dev); |
| ARMGICClass *agc = ARM_GIC_GET_CLASS(s); |
| |
| agc->parent_realize(dev, errp); |
| if (error_is_set(errp)) { |
| return; |
| } |
| |
| gic_init_irqs_and_distributor(s, s->num_irq); |
| |
| /* 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], OBJECT(s), &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], OBJECT(s), &gic_cpu_ops, |
| &s->backref[i], "gic_cpu", 0x100); |
| } |
| /* Distributor */ |
| sysbus_init_mmio(sbd, &s->iomem); |
| /* cpu interfaces (one for "current cpu" plus one per cpu) */ |
| for (i = 0; i <= NUM_CPU(s); i++) { |
| sysbus_init_mmio(sbd, &s->cpuiomem[i]); |
| } |
| } |
| |
| static void arm_gic_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| ARMGICClass *agc = ARM_GIC_CLASS(klass); |
| |
| agc->parent_realize = dc->realize; |
| dc->realize = arm_gic_realize; |
| } |
| |
| static const TypeInfo arm_gic_info = { |
| .name = TYPE_ARM_GIC, |
| .parent = TYPE_ARM_GIC_COMMON, |
| .instance_size = sizeof(GICState), |
| .class_init = arm_gic_class_init, |
| .class_size = sizeof(ARMGICClass), |
| }; |
| |
| static void arm_gic_register_types(void) |
| { |
| type_register_static(&arm_gic_info); |
| } |
| |
| type_init(arm_gic_register_types) |
