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+/*
+ * SiFive CLINT (Core Local Interruptor)
+ *
+ * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
+ * Copyright (c) 2017 SiFive, Inc.
+ *
+ * This provides real-time clock, timer and interprocessor interrupts.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "hw/sysbus.h"
+#include "target/riscv/cpu.h"
+#include "hw/riscv/sifive_clint.h"
+#include "qemu/timer.h"
+
+/* See: riscv-pk/machine/sbi_entry.S and arch/riscv/kernel/time.c */
+#define TIMER_FREQ (10 * 1000 * 1000)
+
+uint64_t cpu_riscv_read_instret(CPURISCVState *env)
+{
+ return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), TIMER_FREQ,
+ NANOSECONDS_PER_SECOND);
+}
+
+uint64_t cpu_riscv_read_rtc(void)
+{
+ return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), TIMER_FREQ,
+ NANOSECONDS_PER_SECOND);
+}
+
+static void sifive_clint_irq_request(void *opaque, int irq, int level)
+{
+ /* These are not the same irq numbers visible to the emulated processor. */
+ RISCVCPU *cpu = opaque;
+ CPURISCVState *env = &cpu->env;
+ CPUState *cs = CPU(cpu);
+
+ /* The CLINT currently uses irq 0 */
+
+ if (level) {
+ cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+ } else {
+ if (!env->mip && !env->mfromhost) {
+ /* no interrupts pending, no host interrupt for HTIF, reset */
+ cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+ }
+ }
+}
+
+/*
+ * Called when timecmp is written to update the QEMU timer or immediately
+ * trigger timer interrupt if mtimecmp <= current timer value.
+ */
+static void sifive_clint_timer_update(CPURISCVState *env)
+{
+ uint64_t next;
+ uint64_t diff;
+
+ uint64_t rtc_r = cpu_riscv_read_rtc();
+
+ if (env->timecmp <= rtc_r) {
+ /* if we're setting an MTIMECMP value in the "past",
+ immediately raise the timer interrupt */
+ env->mip |= MIP_MTIP;
+ qemu_irq_raise(env->irq[3]);
+ return;
+ }
+
+ /* otherwise, set up the future timer interrupt */
+ diff = env->timecmp - rtc_r;
+ /* back to ns (note args switched in muldiv64) */
+ next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+ muldiv64(diff, NANOSECONDS_PER_SECOND, TIMER_FREQ);
+ timer_mod(env->timer, next);
+}
+
+/*
+ * Called by the callback used when the timer set using timer_mod expires.
+ * Should raise the timer interrupt line
+ */
+static void sifive_clint_timer_expire(CPURISCVState *env)
+{
+ /* do not call update here */
+ env->mip |= MIP_MTIP;
+ qemu_irq_raise(env->irq[3]);
+}
+
+static void sifive_clint_write_timecmp(CPURISCVState *env, uint64_t value)
+{
+ env->timecmp = value;
+ env->mip &= ~MIP_MTIP;
+ sifive_clint_timer_update(env);
+}
+
+/*
+ * Callback used when the timer set using timer_mod expires.
+ */
+static void sifive_clint_timer_cb(void *opaque)
+{
+ CPURISCVState *env;
+ env = opaque;
+ sifive_clint_timer_expire(env);
+}
+
+/* CPU wants to read rtc or timecmp register */
+static uint64_t sifive_clint_read(void *opaque, hwaddr addr, unsigned size)
+{
+ SiFiveCLINTState *clint = opaque;
+ if (addr >= clint->sip_base &&
+ addr < clint->sip_base + (clint->num_harts << 2)) {
+ size_t hartid = (addr - clint->sip_base) >> 2;
+ CPUState *cpu = qemu_get_cpu(hartid);
+ CPURISCVState *env = cpu ? cpu->env_ptr : NULL;
+ if (!env) {
+ error_report("clint: invalid timecmp hartid: %zu", hartid);
+ } else if ((addr & 0x3) == 0) {
+ return (env->mip & MIP_MSIP) > 0;
+ } else {
+ error_report("clint: invalid read: %08x", (uint32_t)addr);
+ return 0;
+ }
+ } else if (addr >= clint->timecmp_base &&
+ addr < clint->timecmp_base + (clint->num_harts << 3)) {
+ size_t hartid = (addr - clint->timecmp_base) >> 3;
+ CPUState *cpu = qemu_get_cpu(hartid);
+ CPURISCVState *env = cpu ? cpu->env_ptr : NULL;
+ if (!env) {
+ error_report("clint: invalid timecmp hartid: %zu", hartid);
+ } else if ((addr & 0x7) == 0) {
+ /* timecmp_lo */
+ uint64_t timecmp = env->timecmp;
+ return timecmp & 0xFFFFFFFF;
+ } else if ((addr & 0x7) == 4) {
+ /* timecmp_hi */
+ uint64_t timecmp = env->timecmp;
+ return (timecmp >> 32) & 0xFFFFFFFF;
+ } else {
+ error_report("clint: invalid read: %08x", (uint32_t)addr);
+ return 0;
+ }
+ } else if (addr == clint->time_base) {
+ /* time_lo */
+ return cpu_riscv_read_rtc() & 0xFFFFFFFF;
+ } else if (addr == clint->time_base + 4) {
+ /* time_hi */
+ return (cpu_riscv_read_rtc() >> 32) & 0xFFFFFFFF;
+ }
+
+ error_report("clint: invalid read: %08x", (uint32_t)addr);
+ return 0;
+}
+
+/* CPU wrote to rtc or timecmp register */
+static void sifive_clint_write(void *opaque, hwaddr addr, uint64_t value,
+ unsigned size)
+{
+ SiFiveCLINTState *clint = opaque;
+
+ if (addr >= clint->sip_base &&
+ addr < clint->sip_base + (clint->num_harts << 2)) {
+ size_t hartid = (addr - clint->sip_base) >> 2;
+ CPUState *cpu = qemu_get_cpu(hartid);
+ CPURISCVState *env = cpu ? cpu->env_ptr : NULL;
+ if (!env) {
+ error_report("clint: invalid timecmp hartid: %zu", hartid);
+ } else if ((addr & 0x3) == 0) {
+ if (value) {
+ env->mip |= MIP_MSIP;
+ qemu_irq_raise(env->irq[2]);
+ } else {
+ env->mip &= ~MIP_MSIP;
+ qemu_irq_lower(env->irq[2]);
+ }
+ } else {
+ error_report("clint: invalid sip write: %08x", (uint32_t)addr);
+ }
+ return;
+ } else if (addr >= clint->timecmp_base &&
+ addr < clint->timecmp_base + (clint->num_harts << 3)) {
+ size_t hartid = (addr - clint->timecmp_base) >> 3;
+ CPUState *cpu = qemu_get_cpu(hartid);
+ CPURISCVState *env = cpu ? cpu->env_ptr : NULL;
+ if (!env) {
+ error_report("clint: invalid timecmp hartid: %zu", hartid);
+ } else if ((addr & 0x7) == 0) {
+ /* timecmp_lo */
+ uint64_t timecmp = env->timecmp;
+ sifive_clint_write_timecmp(env,
+ timecmp << 32 | (value & 0xFFFFFFFF));
+ return;
+ } else if ((addr & 0x7) == 4) {
+ /* timecmp_hi */
+ uint64_t timecmp = env->timecmp;
+ sifive_clint_write_timecmp(env,
+ value << 32 | (timecmp & 0xFFFFFFFF));
+ } else {
+ error_report("clint: invalid timecmp write: %08x", (uint32_t)addr);
+ }
+ return;
+ } else if (addr == clint->time_base) {
+ /* time_lo */
+ error_report("clint: time_lo write not implemented");
+ return;
+ } else if (addr == clint->time_base + 4) {
+ /* time_hi */
+ error_report("clint: time_hi write not implemented");
+ return;
+ }
+
+ error_report("clint: invalid write: %08x", (uint32_t)addr);
+}
+
+static const MemoryRegionOps sifive_clint_ops = {
+ .read = sifive_clint_read,
+ .write = sifive_clint_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4
+ }
+};
+
+static Property sifive_clint_properties[] = {
+ DEFINE_PROP_UINT32("num-harts", SiFiveCLINTState, num_harts, 0),
+ DEFINE_PROP_UINT32("sip-base", SiFiveCLINTState, sip_base, 0),
+ DEFINE_PROP_UINT32("timecmp-base", SiFiveCLINTState, timecmp_base, 0),
+ DEFINE_PROP_UINT32("time-base", SiFiveCLINTState, time_base, 0),
+ DEFINE_PROP_UINT32("aperture-size", SiFiveCLINTState, aperture_size, 0),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void sifive_clint_realize(DeviceState *dev, Error **errp)
+{
+ SiFiveCLINTState *s = SIFIVE_CLINT(dev);
+ memory_region_init_io(&s->mmio, OBJECT(dev), &sifive_clint_ops, s,
+ TYPE_SIFIVE_CLINT, s->aperture_size);
+ sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
+}
+
+static void sifive_clint_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ dc->realize = sifive_clint_realize;
+ dc->props = sifive_clint_properties;
+}
+
+static const TypeInfo sifive_clint_info = {
+ .name = TYPE_SIFIVE_CLINT,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(SiFiveCLINTState),
+ .class_init = sifive_clint_class_init,
+};
+
+static void sifive_clint_register_types(void)
+{
+ type_register_static(&sifive_clint_info);
+}
+
+type_init(sifive_clint_register_types)
+
+
+/*
+ * Create CLINT device.
+ */
+DeviceState *sifive_clint_create(hwaddr addr, hwaddr size, uint32_t num_harts,
+ uint32_t sip_base, uint32_t timecmp_base, uint32_t time_base)
+{
+ int i, j;
+ for (i = 0; i < num_harts; i++) {
+ CPUState *cpu = qemu_get_cpu(i);
+ CPURISCVState *env = cpu ? cpu->env_ptr : NULL;
+ if (!env) {
+ continue;
+ }
+ for (j = 0; j < MAX_RISCV_IRQ; j++) {
+ env->irq[j] = qemu_allocate_irq(sifive_clint_irq_request,
+ riscv_env_get_cpu(env), 0 /* irq 0 */);
+ }
+ env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
+ &sifive_clint_timer_cb, env);
+ env->timecmp = 0;
+ }
+
+ DeviceState *dev = qdev_create(NULL, TYPE_SIFIVE_CLINT);
+ qdev_prop_set_uint32(dev, "num-harts", num_harts);
+ qdev_prop_set_uint32(dev, "sip-base", sip_base);
+ qdev_prop_set_uint32(dev, "timecmp-base", timecmp_base);
+ qdev_prop_set_uint32(dev, "time-base", time_base);
+ qdev_prop_set_uint32(dev, "aperture-size", size);
+ qdev_init_nofail(dev);
+ sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr);
+ return dev;
+}
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@@ -0,0 +1,56 @@
+/*
+ * SiFive CLINT (Core Local Interruptor) interface
+ *
+ * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
+ * Copyright (c) 2017 SiFive, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef HW_SIFIVE_CLINT_H
+#define HW_SIFIVE_CLINT_H
+
+#define TYPE_SIFIVE_CLINT "riscv.sifive.clint"
+
+#define SIFIVE_CLINT(obj) \
+ OBJECT_CHECK(SiFiveCLINTState, (obj), TYPE_SIFIVE_CLINT)
+
+typedef struct SiFiveCLINTState {
+ /*< private >*/
+ SysBusDevice parent_obj;
+
+ /*< public >*/
+ MemoryRegion mmio;
+ uint32_t num_harts;
+ uint32_t sip_base;
+ uint32_t timecmp_base;
+ uint32_t time_base;
+ uint32_t aperture_size;
+} SiFiveCLINTState;
+
+DeviceState *sifive_clint_create(hwaddr addr, hwaddr size, uint32_t num_harts,
+ uint32_t sip_base, uint32_t timecmp_base, uint32_t time_base);
+
+enum {
+ SIFIVE_SIP_BASE = 0x0,
+ SIFIVE_TIMECMP_BASE = 0x4000,
+ SIFIVE_TIME_BASE = 0xBFF8
+};
+
+#endif
The CLINT (Core Local Interruptor) device provides real-time clock, timer and interprocessor interrupts based on SiFive's CLINT specification. Signed-off-by: Michael Clark <mjc@sifive.com> --- hw/riscv/sifive_clint.c | 312 ++++++++++++++++++++++++++++++++++++++++ include/hw/riscv/sifive_clint.h | 56 ++++++++ 2 files changed, 368 insertions(+) create mode 100644 hw/riscv/sifive_clint.c create mode 100644 include/hw/riscv/sifive_clint.h