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qemu-patch-raspberry4/hw/arm_gic.c
Peter Maydell acd684280f hw/arm_gic: Remove NVIC ifdefs from gic_state struct 
Remove some NVIC ifdefs from the gic_state struct and its
state save/load functions. This means there are some fields
in it which are present for the NVIC but not used, but means
it always has the same layout and can be pulled out into a
common subclass.

Note that the addition of irq_target[] to the save/load
struct for the NVIC requires a vmstate version bump.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
2012-06-19 13:24:44 +00:00

959 lines
29 KiB
C
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/*
* 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 "sysbus.h"
/* 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
/* Maximum number of possible CPU interfaces, determined by GIC architecture */
#ifdef NVIC
#define NCPU 1
#else
#define NCPU 8
#endif
//#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 ((unsigned)(((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];
int irq_target[GIC_MAXIRQ];
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];
uint32_t num_cpu;
MemoryRegion iomem; /* Distributor */
/* 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 */
uint32_t num_irq;
} gic_state;
static inline int gic_get_current_cpu(gic_state *s)
{
#if NCPU > 1
if (s->num_cpu > 1) {
return cpu_single_env->cpu_index;
}
#endif
return 0;
}
/* 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);
}
}
#ifdef NVIC
static void 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);
}
#endif
/* 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
* ...
*/
gic_state *s = (gic_state *)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;
}
if (level == GIC_TEST_LEVEL(irq, cm)) {
return;
}
if (level) {
GIC_SET_LEVEL(irq, cm);
if (GIC_TEST_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);
}
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(s);
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(s);
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(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);
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(s), 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(s), 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(DeviceState *dev)
{
gic_state *s = FROM_SYSBUS(gic_state, sysbus_from_qdev(dev));
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++) {
qemu_put_be32(f, s->irq_target[i]);
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 != 3) {
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++) {
s->irq_target[i] = qemu_get_be32(f);
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;
if (s->num_cpu > NCPU) {
hw_error("requested %u CPUs exceeds GIC maximum %d\n",
num_cpu, NCPU);
}
#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);
}
i = s->num_irq - GIC_INTERNAL;
#ifndef NVIC
/* 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
* ...
*/
i += (GIC_INTERNAL * num_cpu);
#endif
qdev_init_gpio_in(&s->busdev.qdev, gic_set_irq, i);
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
register_savevm(NULL, "arm_gic", -1, 3, gic_save, gic_load, s);
}
#ifndef NVIC
static int arm_gic_init(SysBusDevice *dev)
{
/* Device instance init function for the GIC sysbus device */
int i;
gic_state *s = FROM_SYSBUS(gic_state, dev);
gic_init(s, s->num_cpu, s->num_irq);
/* Distributor */
sysbus_init_mmio(dev, &s->iomem);
/* cpu interfaces (one for "current cpu" plus one per cpu) */
for (i = 0; i <= NUM_CPU(s); i++) {
sysbus_init_mmio(dev, &s->cpuiomem[i]);
}
return 0;
}
static Property arm_gic_properties[] = {
DEFINE_PROP_UINT32("num-cpu", gic_state, num_cpu, 1),
DEFINE_PROP_UINT32("num-irq", gic_state, num_irq, 32),
DEFINE_PROP_END_OF_LIST(),
};
static void arm_gic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
sbc->init = arm_gic_init;
dc->props = arm_gic_properties;
dc->reset = gic_reset;
dc->no_user = 1;
}
static TypeInfo arm_gic_info = {
.name = "arm_gic",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(gic_state),
.class_init = arm_gic_class_init,
};
static void arm_gic_register_types(void)
{
type_register_static(&arm_gic_info);
}
type_init(arm_gic_register_types)
#endif
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