410 lines
13 KiB
C
410 lines
13 KiB
C
/*
|
|
* ARM Nested Vectored Interrupt Controller
|
|
*
|
|
* Copyright (c) 2006-2007 CodeSourcery.
|
|
* Written by Paul Brook
|
|
*
|
|
* This code is licenced under the GPL.
|
|
*
|
|
* The ARMv7M System controller is fairly tightly tied in with the
|
|
* NVIC. Much of that is also implemented here.
|
|
*/
|
|
|
|
#include "sysbus.h"
|
|
#include "qemu-timer.h"
|
|
#include "arm-misc.h"
|
|
|
|
/* 32 internal lines (16 used for system exceptions) plus 64 external
|
|
interrupt lines. */
|
|
#define GIC_NIRQ 96
|
|
#define NCPU 1
|
|
#define NVIC 1
|
|
|
|
/* Only a single "CPU" interface is present. */
|
|
static inline int
|
|
gic_get_current_cpu(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static uint32_t nvic_readl(void *opaque, uint32_t offset);
|
|
static void nvic_writel(void *opaque, uint32_t offset, uint32_t value);
|
|
|
|
#include "arm_gic.c"
|
|
|
|
typedef struct {
|
|
gic_state gic;
|
|
struct {
|
|
uint32_t control;
|
|
uint32_t reload;
|
|
int64_t tick;
|
|
QEMUTimer *timer;
|
|
} systick;
|
|
} nvic_state;
|
|
|
|
/* qemu timers run at 1GHz. We want something closer to 1MHz. */
|
|
#define SYSTICK_SCALE 1000ULL
|
|
|
|
#define SYSTICK_ENABLE (1 << 0)
|
|
#define SYSTICK_TICKINT (1 << 1)
|
|
#define SYSTICK_CLKSOURCE (1 << 2)
|
|
#define SYSTICK_COUNTFLAG (1 << 16)
|
|
|
|
int system_clock_scale;
|
|
|
|
/* Conversion factor from qemu timer to SysTick frequencies. */
|
|
static inline int64_t systick_scale(nvic_state *s)
|
|
{
|
|
if (s->systick.control & SYSTICK_CLKSOURCE)
|
|
return system_clock_scale;
|
|
else
|
|
return 1000;
|
|
}
|
|
|
|
static void systick_reload(nvic_state *s, int reset)
|
|
{
|
|
if (reset)
|
|
s->systick.tick = qemu_get_clock(vm_clock);
|
|
s->systick.tick += (s->systick.reload + 1) * systick_scale(s);
|
|
qemu_mod_timer(s->systick.timer, s->systick.tick);
|
|
}
|
|
|
|
static void systick_timer_tick(void * opaque)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
s->systick.control |= SYSTICK_COUNTFLAG;
|
|
if (s->systick.control & SYSTICK_TICKINT) {
|
|
/* Trigger the interrupt. */
|
|
armv7m_nvic_set_pending(s, ARMV7M_EXCP_SYSTICK);
|
|
}
|
|
if (s->systick.reload == 0) {
|
|
s->systick.control &= ~SYSTICK_ENABLE;
|
|
} else {
|
|
systick_reload(s, 0);
|
|
}
|
|
}
|
|
|
|
/* The external routines use the hardware vector numbering, ie. the first
|
|
IRQ is #16. The internal GIC routines use #32 as the first IRQ. */
|
|
void armv7m_nvic_set_pending(void *opaque, int irq)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
if (irq >= 16)
|
|
irq += 16;
|
|
gic_set_pending_private(&s->gic, 0, irq);
|
|
}
|
|
|
|
/* Make pending IRQ active. */
|
|
int armv7m_nvic_acknowledge_irq(void *opaque)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
uint32_t irq;
|
|
|
|
irq = gic_acknowledge_irq(&s->gic, 0);
|
|
if (irq == 1023)
|
|
hw_error("Interrupt but no vector\n");
|
|
if (irq >= 32)
|
|
irq -= 16;
|
|
return irq;
|
|
}
|
|
|
|
void armv7m_nvic_complete_irq(void *opaque, int irq)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
if (irq >= 16)
|
|
irq += 16;
|
|
gic_complete_irq(&s->gic, 0, irq);
|
|
}
|
|
|
|
static uint32_t nvic_readl(void *opaque, uint32_t offset)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
uint32_t val;
|
|
int irq;
|
|
|
|
switch (offset) {
|
|
case 4: /* Interrupt Control Type. */
|
|
return (GIC_NIRQ / 32) - 1;
|
|
case 0x10: /* SysTick Control and Status. */
|
|
val = s->systick.control;
|
|
s->systick.control &= ~SYSTICK_COUNTFLAG;
|
|
return val;
|
|
case 0x14: /* SysTick Reload Value. */
|
|
return s->systick.reload;
|
|
case 0x18: /* SysTick Current Value. */
|
|
{
|
|
int64_t t;
|
|
if ((s->systick.control & SYSTICK_ENABLE) == 0)
|
|
return 0;
|
|
t = qemu_get_clock(vm_clock);
|
|
if (t >= s->systick.tick)
|
|
return 0;
|
|
val = ((s->systick.tick - (t + 1)) / systick_scale(s)) + 1;
|
|
/* The interrupt in triggered when the timer reaches zero.
|
|
However the counter is not reloaded until the next clock
|
|
tick. This is a hack to return zero during the first tick. */
|
|
if (val > s->systick.reload)
|
|
val = 0;
|
|
return val;
|
|
}
|
|
case 0x1c: /* SysTick Calibration Value. */
|
|
return 10000;
|
|
case 0xd00: /* CPUID Base. */
|
|
return cpu_single_env->cp15.c0_cpuid;
|
|
case 0xd04: /* Interrypt Control State. */
|
|
/* VECTACTIVE */
|
|
val = s->gic.running_irq[0];
|
|
if (val == 1023) {
|
|
val = 0;
|
|
} else if (val >= 32) {
|
|
val -= 16;
|
|
}
|
|
/* RETTOBASE */
|
|
if (s->gic.running_irq[0] == 1023
|
|
|| s->gic.last_active[s->gic.running_irq[0]][0] == 1023) {
|
|
val |= (1 << 11);
|
|
}
|
|
/* VECTPENDING */
|
|
if (s->gic.current_pending[0] != 1023)
|
|
val |= (s->gic.current_pending[0] << 12);
|
|
/* ISRPENDING */
|
|
for (irq = 32; irq < GIC_NIRQ; irq++) {
|
|
if (s->gic.irq_state[irq].pending) {
|
|
val |= (1 << 22);
|
|
break;
|
|
}
|
|
}
|
|
/* PENDSTSET */
|
|
if (s->gic.irq_state[ARMV7M_EXCP_SYSTICK].pending)
|
|
val |= (1 << 26);
|
|
/* PENDSVSET */
|
|
if (s->gic.irq_state[ARMV7M_EXCP_PENDSV].pending)
|
|
val |= (1 << 28);
|
|
/* NMIPENDSET */
|
|
if (s->gic.irq_state[ARMV7M_EXCP_NMI].pending)
|
|
val |= (1 << 31);
|
|
return val;
|
|
case 0xd08: /* Vector Table Offset. */
|
|
return cpu_single_env->v7m.vecbase;
|
|
case 0xd0c: /* Application Interrupt/Reset Control. */
|
|
return 0xfa05000;
|
|
case 0xd10: /* System Control. */
|
|
/* TODO: Implement SLEEPONEXIT. */
|
|
return 0;
|
|
case 0xd14: /* Configuration Control. */
|
|
/* TODO: Implement Configuration Control bits. */
|
|
return 0;
|
|
case 0xd18: case 0xd1c: case 0xd20: /* System Handler Priority. */
|
|
irq = offset - 0xd14;
|
|
val = 0;
|
|
val |= s->gic.priority1[irq++][0];
|
|
val |= s->gic.priority1[irq++][0] << 8;
|
|
val |= s->gic.priority1[irq++][0] << 16;
|
|
val |= s->gic.priority1[irq][0] << 24;
|
|
return val;
|
|
case 0xd24: /* System Handler Status. */
|
|
val = 0;
|
|
if (s->gic.irq_state[ARMV7M_EXCP_MEM].active) val |= (1 << 0);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_BUS].active) val |= (1 << 1);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_USAGE].active) val |= (1 << 3);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_SVC].active) val |= (1 << 7);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_DEBUG].active) val |= (1 << 8);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_PENDSV].active) val |= (1 << 10);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_SYSTICK].active) val |= (1 << 11);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_USAGE].pending) val |= (1 << 12);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_MEM].pending) val |= (1 << 13);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_BUS].pending) val |= (1 << 14);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_SVC].pending) val |= (1 << 15);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_MEM].enabled) val |= (1 << 16);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_BUS].enabled) val |= (1 << 17);
|
|
if (s->gic.irq_state[ARMV7M_EXCP_USAGE].enabled) val |= (1 << 18);
|
|
return val;
|
|
case 0xd28: /* Configurable Fault Status. */
|
|
/* TODO: Implement Fault Status. */
|
|
hw_error("Not implemented: Configurable Fault Status.");
|
|
return 0;
|
|
case 0xd2c: /* Hard Fault Status. */
|
|
case 0xd30: /* Debug Fault Status. */
|
|
case 0xd34: /* Mem Manage Address. */
|
|
case 0xd38: /* Bus Fault Address. */
|
|
case 0xd3c: /* Aux Fault Status. */
|
|
/* TODO: Implement fault status registers. */
|
|
goto bad_reg;
|
|
case 0xd40: /* PFR0. */
|
|
return 0x00000030;
|
|
case 0xd44: /* PRF1. */
|
|
return 0x00000200;
|
|
case 0xd48: /* DFR0. */
|
|
return 0x00100000;
|
|
case 0xd4c: /* AFR0. */
|
|
return 0x00000000;
|
|
case 0xd50: /* MMFR0. */
|
|
return 0x00000030;
|
|
case 0xd54: /* MMFR1. */
|
|
return 0x00000000;
|
|
case 0xd58: /* MMFR2. */
|
|
return 0x00000000;
|
|
case 0xd5c: /* MMFR3. */
|
|
return 0x00000000;
|
|
case 0xd60: /* ISAR0. */
|
|
return 0x01141110;
|
|
case 0xd64: /* ISAR1. */
|
|
return 0x02111000;
|
|
case 0xd68: /* ISAR2. */
|
|
return 0x21112231;
|
|
case 0xd6c: /* ISAR3. */
|
|
return 0x01111110;
|
|
case 0xd70: /* ISAR4. */
|
|
return 0x01310102;
|
|
/* TODO: Implement debug registers. */
|
|
default:
|
|
bad_reg:
|
|
hw_error("NVIC: Bad read offset 0x%x\n", offset);
|
|
}
|
|
}
|
|
|
|
static void nvic_writel(void *opaque, uint32_t offset, uint32_t value)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
uint32_t oldval;
|
|
switch (offset) {
|
|
case 0x10: /* SysTick Control and Status. */
|
|
oldval = s->systick.control;
|
|
s->systick.control &= 0xfffffff8;
|
|
s->systick.control |= value & 7;
|
|
if ((oldval ^ value) & SYSTICK_ENABLE) {
|
|
int64_t now = qemu_get_clock(vm_clock);
|
|
if (value & SYSTICK_ENABLE) {
|
|
if (s->systick.tick) {
|
|
s->systick.tick += now;
|
|
qemu_mod_timer(s->systick.timer, s->systick.tick);
|
|
} else {
|
|
systick_reload(s, 1);
|
|
}
|
|
} else {
|
|
qemu_del_timer(s->systick.timer);
|
|
s->systick.tick -= now;
|
|
if (s->systick.tick < 0)
|
|
s->systick.tick = 0;
|
|
}
|
|
} else if ((oldval ^ value) & SYSTICK_CLKSOURCE) {
|
|
/* This is a hack. Force the timer to be reloaded
|
|
when the reference clock is changed. */
|
|
systick_reload(s, 1);
|
|
}
|
|
break;
|
|
case 0x14: /* SysTick Reload Value. */
|
|
s->systick.reload = value;
|
|
break;
|
|
case 0x18: /* SysTick Current Value. Writes reload the timer. */
|
|
systick_reload(s, 1);
|
|
s->systick.control &= ~SYSTICK_COUNTFLAG;
|
|
break;
|
|
case 0xd04: /* Interrupt Control State. */
|
|
if (value & (1 << 31)) {
|
|
armv7m_nvic_set_pending(s, ARMV7M_EXCP_NMI);
|
|
}
|
|
if (value & (1 << 28)) {
|
|
armv7m_nvic_set_pending(s, ARMV7M_EXCP_PENDSV);
|
|
} else if (value & (1 << 27)) {
|
|
s->gic.irq_state[ARMV7M_EXCP_PENDSV].pending = 0;
|
|
gic_update(&s->gic);
|
|
}
|
|
if (value & (1 << 26)) {
|
|
armv7m_nvic_set_pending(s, ARMV7M_EXCP_SYSTICK);
|
|
} else if (value & (1 << 25)) {
|
|
s->gic.irq_state[ARMV7M_EXCP_SYSTICK].pending = 0;
|
|
gic_update(&s->gic);
|
|
}
|
|
break;
|
|
case 0xd08: /* Vector Table Offset. */
|
|
cpu_single_env->v7m.vecbase = value & 0xffffff80;
|
|
break;
|
|
case 0xd0c: /* Application Interrupt/Reset Control. */
|
|
if ((value >> 16) == 0x05fa) {
|
|
if (value & 2) {
|
|
hw_error("VECTCLRACTIVE not implemented");
|
|
}
|
|
if (value & 5) {
|
|
hw_error("System reset");
|
|
}
|
|
}
|
|
break;
|
|
case 0xd10: /* System Control. */
|
|
case 0xd14: /* Configuration Control. */
|
|
/* TODO: Implement control registers. */
|
|
goto bad_reg;
|
|
case 0xd18: case 0xd1c: case 0xd20: /* System Handler Priority. */
|
|
{
|
|
int irq;
|
|
irq = offset - 0xd14;
|
|
s->gic.priority1[irq++][0] = value & 0xff;
|
|
s->gic.priority1[irq++][0] = (value >> 8) & 0xff;
|
|
s->gic.priority1[irq++][0] = (value >> 16) & 0xff;
|
|
s->gic.priority1[irq][0] = (value >> 24) & 0xff;
|
|
gic_update(&s->gic);
|
|
}
|
|
break;
|
|
case 0xd24: /* System Handler Control. */
|
|
/* TODO: Real hardware allows you to set/clear the active bits
|
|
under some circumstances. We don't implement this. */
|
|
s->gic.irq_state[ARMV7M_EXCP_MEM].enabled = (value & (1 << 16)) != 0;
|
|
s->gic.irq_state[ARMV7M_EXCP_BUS].enabled = (value & (1 << 17)) != 0;
|
|
s->gic.irq_state[ARMV7M_EXCP_USAGE].enabled = (value & (1 << 18)) != 0;
|
|
break;
|
|
case 0xd28: /* Configurable Fault Status. */
|
|
case 0xd2c: /* Hard Fault Status. */
|
|
case 0xd30: /* Debug Fault Status. */
|
|
case 0xd34: /* Mem Manage Address. */
|
|
case 0xd38: /* Bus Fault Address. */
|
|
case 0xd3c: /* Aux Fault Status. */
|
|
goto bad_reg;
|
|
default:
|
|
bad_reg:
|
|
hw_error("NVIC: Bad write offset 0x%x\n", offset);
|
|
}
|
|
}
|
|
|
|
static void nvic_save(QEMUFile *f, void *opaque)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
|
|
qemu_put_be32(f, s->systick.control);
|
|
qemu_put_be32(f, s->systick.reload);
|
|
qemu_put_be64(f, s->systick.tick);
|
|
qemu_put_timer(f, s->systick.timer);
|
|
}
|
|
|
|
static int nvic_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
nvic_state *s = (nvic_state *)opaque;
|
|
|
|
if (version_id != 1)
|
|
return -EINVAL;
|
|
|
|
s->systick.control = qemu_get_be32(f);
|
|
s->systick.reload = qemu_get_be32(f);
|
|
s->systick.tick = qemu_get_be64(f);
|
|
qemu_get_timer(f, s->systick.timer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int armv7m_nvic_init(SysBusDevice *dev)
|
|
{
|
|
nvic_state *s= FROM_SYSBUSGIC(nvic_state, dev);
|
|
|
|
gic_init(&s->gic);
|
|
cpu_register_physical_memory(0xe000e000, 0x1000, s->gic.iomemtype);
|
|
s->systick.timer = qemu_new_timer(vm_clock, systick_timer_tick, s);
|
|
register_savevm(&dev->qdev, "armv7m_nvic", -1, 1, nvic_save, nvic_load, s);
|
|
return 0;
|
|
}
|
|
|
|
static void armv7m_nvic_register_devices(void)
|
|
{
|
|
sysbus_register_dev("armv7m_nvic", sizeof(nvic_state), armv7m_nvic_init);
|
|
}
|
|
|
|
device_init(armv7m_nvic_register_devices)
|