root / hw / armv7m_nvic.c @ 81a322d4
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/*
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* ARM Nested Vectored 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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* The ARMv7M System controller is fairly tightly tied in with the
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* NVIC. Much of that is also implemented here.
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*/
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#include "sysbus.h" |
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#include "qemu-timer.h" |
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#include "arm-misc.h" |
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/* 32 internal lines (16 used for system exceptions) plus 64 external
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interrupt lines. */
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#define GIC_NIRQ 96 |
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#define NCPU 1 |
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#define NVIC 1 |
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/* Only a single "CPU" interface is present. */
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static inline int |
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gic_get_current_cpu(void)
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{
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return 0; |
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} |
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static uint32_t nvic_readl(void *opaque, uint32_t offset); |
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static void nvic_writel(void *opaque, uint32_t offset, uint32_t value); |
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#include "arm_gic.c" |
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typedef struct { |
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gic_state gic; |
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struct {
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uint32_t control; |
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uint32_t reload; |
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int64_t tick; |
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QEMUTimer *timer; |
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} systick; |
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} nvic_state; |
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/* qemu timers run at 1GHz. We want something closer to 1MHz. */
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#define SYSTICK_SCALE 1000ULL |
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|
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#define SYSTICK_ENABLE (1 << 0) |
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#define SYSTICK_TICKINT (1 << 1) |
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#define SYSTICK_CLKSOURCE (1 << 2) |
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#define SYSTICK_COUNTFLAG (1 << 16) |
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int system_clock_scale;
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/* Conversion factor from qemu timer to SysTick frequencies. */
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static inline int64_t systick_scale(nvic_state *s) |
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{
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if (s->systick.control & SYSTICK_CLKSOURCE)
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return system_clock_scale;
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else
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return 1000; |
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} |
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static void systick_reload(nvic_state *s, int reset) |
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{
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if (reset)
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s->systick.tick = qemu_get_clock(vm_clock); |
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s->systick.tick += (s->systick.reload + 1) * systick_scale(s);
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qemu_mod_timer(s->systick.timer, s->systick.tick); |
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} |
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static void systick_timer_tick(void * opaque) |
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{
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nvic_state *s = (nvic_state *)opaque; |
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s->systick.control |= SYSTICK_COUNTFLAG; |
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if (s->systick.control & SYSTICK_TICKINT) {
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/* Trigger the interrupt. */
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armv7m_nvic_set_pending(s, ARMV7M_EXCP_SYSTICK); |
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} |
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if (s->systick.reload == 0) { |
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s->systick.control &= ~SYSTICK_ENABLE; |
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} else {
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systick_reload(s, 0);
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} |
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} |
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/* The external routines use the hardware vector numbering, ie. the first
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IRQ is #16. The internal GIC routines use #32 as the first IRQ. */
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void armv7m_nvic_set_pending(void *opaque, int irq) |
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{
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nvic_state *s = (nvic_state *)opaque; |
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if (irq >= 16) |
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irq += 16;
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gic_set_pending_private(&s->gic, 0, irq);
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} |
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/* Make pending IRQ active. */
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int armv7m_nvic_acknowledge_irq(void *opaque) |
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{
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nvic_state *s = (nvic_state *)opaque; |
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uint32_t irq; |
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irq = gic_acknowledge_irq(&s->gic, 0);
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if (irq == 1023) |
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hw_error("Interrupt but no vector\n");
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if (irq >= 32) |
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irq -= 16;
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return irq;
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} |
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void armv7m_nvic_complete_irq(void *opaque, int irq) |
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{
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nvic_state *s = (nvic_state *)opaque; |
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if (irq >= 16) |
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irq += 16;
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gic_complete_irq(&s->gic, 0, irq);
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} |
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static uint32_t nvic_readl(void *opaque, uint32_t offset) |
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{
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nvic_state *s = (nvic_state *)opaque; |
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uint32_t val; |
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int irq;
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switch (offset) {
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case 4: /* Interrupt Control Type. */ |
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return (GIC_NIRQ / 32) - 1; |
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case 0x10: /* SysTick Control and Status. */ |
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val = s->systick.control; |
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s->systick.control &= ~SYSTICK_COUNTFLAG; |
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return val;
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case 0x14: /* SysTick Reload Value. */ |
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return s->systick.reload;
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case 0x18: /* SysTick Current Value. */ |
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{
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int64_t t; |
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if ((s->systick.control & SYSTICK_ENABLE) == 0) |
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return 0; |
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t = qemu_get_clock(vm_clock); |
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if (t >= s->systick.tick)
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return 0; |
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val = ((s->systick.tick - (t + 1)) / systick_scale(s)) + 1; |
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/* The interrupt in triggered when the timer reaches zero.
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However the counter is not reloaded until the next clock
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tick. This is a hack to return zero during the first tick. */
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if (val > s->systick.reload)
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val = 0;
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return val;
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} |
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case 0x1c: /* SysTick Calibration Value. */ |
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return 10000; |
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case 0xd00: /* CPUID Base. */ |
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return cpu_single_env->cp15.c0_cpuid;
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case 0xd04: /* Interrypt Control State. */ |
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/* VECTACTIVE */
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val = s->gic.running_irq[0];
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if (val == 1023) { |
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val = 0;
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} else if (val >= 32) { |
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val -= 16;
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} |
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/* RETTOBASE */
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if (s->gic.running_irq[0] == 1023 |
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|| s->gic.last_active[s->gic.running_irq[0]][0] == 1023) { |
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val |= (1 << 11); |
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} |
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/* VECTPENDING */
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if (s->gic.current_pending[0] != 1023) |
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val |= (s->gic.current_pending[0] << 12); |
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/* ISRPENDING */
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for (irq = 32; irq < GIC_NIRQ; irq++) { |
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if (s->gic.irq_state[irq].pending) {
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val |= (1 << 22); |
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break;
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} |
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} |
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/* PENDSTSET */
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if (s->gic.irq_state[ARMV7M_EXCP_SYSTICK].pending)
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val |= (1 << 26); |
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/* PENDSVSET */
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if (s->gic.irq_state[ARMV7M_EXCP_PENDSV].pending)
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val |= (1 << 28); |
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/* NMIPENDSET */
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if (s->gic.irq_state[ARMV7M_EXCP_NMI].pending)
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val |= (1 << 31); |
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return val;
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case 0xd08: /* Vector Table Offset. */ |
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return cpu_single_env->v7m.vecbase;
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case 0xd0c: /* Application Interrupt/Reset Control. */ |
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return 0xfa05000; |
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case 0xd10: /* System Control. */ |
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/* TODO: Implement SLEEPONEXIT. */
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return 0; |
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case 0xd14: /* Configuration Control. */ |
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/* TODO: Implement Configuration Control bits. */
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return 0; |
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case 0xd18: case 0xd1c: case 0xd20: /* System Handler Priority. */ |
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irq = offset - 0xd14;
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val = 0;
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val = s->gic.priority1[irq++][0];
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val = s->gic.priority1[irq++][0] << 8; |
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val = s->gic.priority1[irq++][0] << 16; |
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val = s->gic.priority1[irq][0] << 24; |
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return val;
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case 0xd24: /* System Handler Status. */ |
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val = 0;
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if (s->gic.irq_state[ARMV7M_EXCP_MEM].active) val |= (1 << 0); |
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if (s->gic.irq_state[ARMV7M_EXCP_BUS].active) val |= (1 << 1); |
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if (s->gic.irq_state[ARMV7M_EXCP_USAGE].active) val |= (1 << 3); |
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if (s->gic.irq_state[ARMV7M_EXCP_SVC].active) val |= (1 << 7); |
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if (s->gic.irq_state[ARMV7M_EXCP_DEBUG].active) val |= (1 << 8); |
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if (s->gic.irq_state[ARMV7M_EXCP_PENDSV].active) val |= (1 << 10); |
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if (s->gic.irq_state[ARMV7M_EXCP_SYSTICK].active) val |= (1 << 11); |
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if (s->gic.irq_state[ARMV7M_EXCP_USAGE].pending) val |= (1 << 12); |
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if (s->gic.irq_state[ARMV7M_EXCP_MEM].pending) val |= (1 << 13); |
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if (s->gic.irq_state[ARMV7M_EXCP_BUS].pending) val |= (1 << 14); |
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if (s->gic.irq_state[ARMV7M_EXCP_SVC].pending) val |= (1 << 15); |
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if (s->gic.irq_state[ARMV7M_EXCP_MEM].enabled) val |= (1 << 16); |
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if (s->gic.irq_state[ARMV7M_EXCP_BUS].enabled) val |= (1 << 17); |
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if (s->gic.irq_state[ARMV7M_EXCP_USAGE].enabled) val |= (1 << 18); |
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return val;
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case 0xd28: /* Configurable Fault Status. */ |
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/* TODO: Implement Fault Status. */
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hw_error("Not implemented: Configurable Fault Status.");
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return 0; |
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case 0xd2c: /* Hard Fault Status. */ |
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case 0xd30: /* Debug Fault Status. */ |
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case 0xd34: /* Mem Manage Address. */ |
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case 0xd38: /* Bus Fault Address. */ |
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case 0xd3c: /* Aux Fault Status. */ |
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/* TODO: Implement fault status registers. */
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goto bad_reg;
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case 0xd40: /* PFR0. */ |
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return 0x00000030; |
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case 0xd44: /* PRF1. */ |
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return 0x00000200; |
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case 0xd48: /* DFR0. */ |
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return 0x00100000; |
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case 0xd4c: /* AFR0. */ |
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return 0x00000000; |
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case 0xd50: /* MMFR0. */ |
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return 0x00000030; |
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case 0xd54: /* MMFR1. */ |
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return 0x00000000; |
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case 0xd58: /* MMFR2. */ |
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return 0x00000000; |
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case 0xd5c: /* MMFR3. */ |
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return 0x00000000; |
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case 0xd60: /* ISAR0. */ |
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return 0x01141110; |
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case 0xd64: /* ISAR1. */ |
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return 0x02111000; |
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case 0xd68: /* ISAR2. */ |
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return 0x21112231; |
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case 0xd6c: /* ISAR3. */ |
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return 0x01111110; |
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case 0xd70: /* ISAR4. */ |
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return 0x01310102; |
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/* TODO: Implement debug registers. */
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default:
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bad_reg:
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hw_error("NVIC: Bad read offset 0x%x\n", offset);
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} |
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} |
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|
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static void nvic_writel(void *opaque, uint32_t offset, uint32_t value) |
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{
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nvic_state *s = (nvic_state *)opaque; |
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uint32_t oldval; |
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switch (offset) {
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case 0x10: /* SysTick Control and Status. */ |
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oldval = s->systick.control; |
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s->systick.control &= 0xfffffff8;
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s->systick.control |= value & 7;
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if ((oldval ^ value) & SYSTICK_ENABLE) {
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int64_t now = qemu_get_clock(vm_clock); |
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if (value & SYSTICK_ENABLE) {
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if (s->systick.tick) {
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s->systick.tick += now; |
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qemu_mod_timer(s->systick.timer, s->systick.tick); |
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} else {
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systick_reload(s, 1);
|
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} |
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} else {
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qemu_del_timer(s->systick.timer); |
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s->systick.tick -= now; |
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if (s->systick.tick < 0) |
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s->systick.tick = 0;
|
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} |
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} else if ((oldval ^ value) & SYSTICK_CLKSOURCE) { |
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/* This is a hack. Force the timer to be reloaded
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when the reference clock is changed. */
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systick_reload(s, 1);
|
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} |
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break;
|
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case 0x14: /* SysTick Reload Value. */ |
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s->systick.reload = value; |
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break;
|
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case 0x18: /* SysTick Current Value. Writes reload the timer. */ |
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systick_reload(s, 1);
|
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s->systick.control &= ~SYSTICK_COUNTFLAG; |
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break;
|
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case 0xd04: /* Interrupt Control State. */ |
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if (value & (1 << 31)) { |
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armv7m_nvic_set_pending(s, ARMV7M_EXCP_NMI); |
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} |
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if (value & (1 << 28)) { |
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armv7m_nvic_set_pending(s, ARMV7M_EXCP_PENDSV); |
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} else if (value & (1 << 27)) { |
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s->gic.irq_state[ARMV7M_EXCP_PENDSV].pending = 0;
|
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gic_update(&s->gic); |
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} |
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if (value & (1 << 26)) { |
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armv7m_nvic_set_pending(s, ARMV7M_EXCP_SYSTICK); |
| 315 |
} else if (value & (1 << 25)) { |
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s->gic.irq_state[ARMV7M_EXCP_SYSTICK].pending = 0;
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gic_update(&s->gic); |
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} |
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break;
|
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case 0xd08: /* Vector Table Offset. */ |
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cpu_single_env->v7m.vecbase = value & 0xffffff80;
|
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break;
|
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case 0xd0c: /* Application Interrupt/Reset Control. */ |
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if ((value >> 16) == 0x05fa) { |
| 325 |
if (value & 2) { |
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hw_error("VECTCLRACTIVE not implemented");
|
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} |
| 328 |
if (value & 5) { |
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hw_error("System reset");
|
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} |
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} |
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break;
|
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case 0xd10: /* System Control. */ |
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case 0xd14: /* Configuration Control. */ |
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/* TODO: Implement control registers. */
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goto bad_reg;
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case 0xd18: case 0xd1c: case 0xd20: /* System Handler Priority. */ |
| 338 |
{
|
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int irq;
|
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irq = offset - 0xd14;
|
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s->gic.priority1[irq++][0] = value & 0xff; |
| 342 |
s->gic.priority1[irq++][0] = (value >> 8) & 0xff; |
| 343 |
s->gic.priority1[irq++][0] = (value >> 16) & 0xff; |
| 344 |
s->gic.priority1[irq][0] = (value >> 24) & 0xff; |
| 345 |
gic_update(&s->gic); |
| 346 |
} |
| 347 |
break;
|
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case 0xd24: /* System Handler Control. */ |
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/* TODO: Real hardware allows you to set/clear the active bits
|
| 350 |
under some circumstances. We don't implement this. */
|
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s->gic.irq_state[ARMV7M_EXCP_MEM].enabled = (value & (1 << 16)) != 0; |
| 352 |
s->gic.irq_state[ARMV7M_EXCP_BUS].enabled = (value & (1 << 17)) != 0; |
| 353 |
s->gic.irq_state[ARMV7M_EXCP_USAGE].enabled = (value & (1 << 18)) != 0; |
| 354 |
break;
|
| 355 |
case 0xd28: /* Configurable Fault Status. */ |
| 356 |
case 0xd2c: /* Hard Fault Status. */ |
| 357 |
case 0xd30: /* Debug Fault Status. */ |
| 358 |
case 0xd34: /* Mem Manage Address. */ |
| 359 |
case 0xd38: /* Bus Fault Address. */ |
| 360 |
case 0xd3c: /* Aux Fault Status. */ |
| 361 |
goto bad_reg;
|
| 362 |
default:
|
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bad_reg:
|
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hw_error("NVIC: Bad write offset 0x%x\n", offset);
|
| 365 |
} |
| 366 |
} |
| 367 |
|
| 368 |
static void nvic_save(QEMUFile *f, void *opaque) |
| 369 |
{
|
| 370 |
nvic_state *s = (nvic_state *)opaque; |
| 371 |
|
| 372 |
qemu_put_be32(f, s->systick.control); |
| 373 |
qemu_put_be32(f, s->systick.reload); |
| 374 |
qemu_put_be64(f, s->systick.tick); |
| 375 |
qemu_put_timer(f, s->systick.timer); |
| 376 |
} |
| 377 |
|
| 378 |
static int nvic_load(QEMUFile *f, void *opaque, int version_id) |
| 379 |
{
|
| 380 |
nvic_state *s = (nvic_state *)opaque; |
| 381 |
|
| 382 |
if (version_id != 1) |
| 383 |
return -EINVAL;
|
| 384 |
|
| 385 |
s->systick.control = qemu_get_be32(f); |
| 386 |
s->systick.reload = qemu_get_be32(f); |
| 387 |
s->systick.tick = qemu_get_be64(f); |
| 388 |
qemu_get_timer(f, s->systick.timer); |
| 389 |
|
| 390 |
return 0; |
| 391 |
} |
| 392 |
|
| 393 |
static int armv7m_nvic_init(SysBusDevice *dev) |
| 394 |
{
|
| 395 |
nvic_state *s= FROM_SYSBUSGIC(nvic_state, dev); |
| 396 |
|
| 397 |
gic_init(&s->gic); |
| 398 |
cpu_register_physical_memory(0xe000e000, 0x1000, s->gic.iomemtype); |
| 399 |
s->systick.timer = qemu_new_timer(vm_clock, systick_timer_tick, s); |
| 400 |
register_savevm("armv7m_nvic", -1, 1, nvic_save, nvic_load, s); |
| 401 |
return 0; |
| 402 |
} |
| 403 |
|
| 404 |
static void armv7m_nvic_register_devices(void) |
| 405 |
{
|
| 406 |
sysbus_register_dev("armv7m_nvic", sizeof(nvic_state), armv7m_nvic_init); |
| 407 |
} |
| 408 |
|
| 409 |
device_init(armv7m_nvic_register_devices) |