new file mode 100644
@@ -0,0 +1,21 @@
+#
+# QEMU ARC CPU
+#
+# Copyright (c) 2019
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see
+# http://www.gnu.org/licenses/lgpl-2.1.html
+#
+
+obj-y = arc_sim.o arc_uart.o sample.o pic_cpu.o boot.o board-hsdk.o sim-hs.o nsim.o
new file mode 100644
@@ -0,0 +1,124 @@
+/*
+ * QEMU ARC CPU
+ *
+ * Copyright (c) 2020 Synppsys Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "cpu.h"
+#include "hw/hw.h"
+#include "hw/boards.h"
+#include "elf.h"
+#include "hw/char/serial.h"
+#include "net/net.h"
+#include "hw/loader.h"
+#include "exec/memory.h"
+#include "exec/address-spaces.h"
+#include "sysemu/reset.h"
+#include "sysemu/runstate.h"
+#include "sysemu/sysemu.h"
+#include "hw/sysbus.h"
+#include "hw/arc/cpudevs.h"
+#include "boot.h"
+
+
+static uint64_t arc_io_read(void *opaque, hwaddr addr, unsigned size)
+{
+ return 0;
+}
+
+static void arc_io_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ switch (addr) {
+ case 0x08: /* board reset. */
+ qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+ break;
+ default:
+ break;
+ }
+}
+
+static const MemoryRegionOps arc_io_ops = {
+ .read = arc_io_read,
+ .write = arc_io_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void arc_sim_init(MachineState *machine)
+{
+ static struct arc_boot_info boot_info;
+ unsigned int smp_cpus = machine->smp.cpus;
+ ram_addr_t ram_base = 0;
+ ram_addr_t ram_size = machine->ram_size;
+ ARCCPU *cpu = NULL;
+ MemoryRegion *ram, *system_io;
+ int n;
+
+ boot_info.ram_start = ram_base;
+ boot_info.ram_size = ram_size;
+ boot_info.kernel_filename = machine->kernel_filename;
+
+ for (n = 0; n < smp_cpus; n++) {
+ cpu = ARC_CPU(object_new(machine->cpu_type));
+ if (cpu == NULL) {
+ fprintf(stderr, "Unable to find CPU definition!\n");
+ exit(1);
+ }
+
+ /* Set the initial CPU properties. */
+ object_property_set_uint(OBJECT(cpu), "freq_hz", 1000000, &error_fatal);
+ object_property_set_bool(OBJECT(cpu), "rtc-opt", true, &error_fatal);
+ object_property_set_bool(OBJECT(cpu), "realized", true, &error_fatal);
+
+ /* Initialize internal devices. */
+ cpu_arc_pic_init(cpu);
+ cpu_arc_clock_init(cpu);
+
+ qemu_register_reset(arc_cpu_reset, cpu);
+ }
+
+ ram = g_new(MemoryRegion, 1);
+ memory_region_init_ram(ram, NULL, "arc.ram", ram_size, &error_fatal);
+ memory_region_add_subregion(get_system_memory(), ram_base, ram);
+
+ system_io = g_new(MemoryRegion, 1);
+ memory_region_init_io(system_io, NULL, &arc_io_ops, NULL, "arc.io",
+ 1024);
+ memory_region_add_subregion(get_system_memory(), 0xf0000000, system_io);
+
+ serial_mm_init(get_system_memory(), 0x90000000, 2, cpu->env.irq[20],
+ 115200, serial_hd(0), DEVICE_NATIVE_ENDIAN);
+
+ arc_load_kernel(cpu, &boot_info);
+}
+
+static void arc_sim_machine_init(MachineClass *mc)
+{
+ mc->desc = "ARCxx simulation";
+ mc->init = arc_sim_init;
+ mc->max_cpus = 1;
+ mc->is_default = false;
+ mc->default_cpu_type = ARC_CPU_TYPE_NAME("archs");
+}
+
+DEFINE_MACHINE("arc-sim", arc_sim_machine_init)
+
+
+/*-*-indent-tabs-mode:nil;tab-width:4;indent-line-function:'insert-tab'-*-*/
+/* vim: set ts=4 sw=4 et: */
new file mode 100644
@@ -0,0 +1,100 @@
+/*
+ * QEMU ARC CPU
+ *
+ * Copyright (c) 2020 Synppsys Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+
+#include "qemu/osdep.h"
+#include "boot.h"
+#include "elf.h"
+#include "hw/loader.h"
+#include "qemu/error-report.h"
+#include "qemu/units.h"
+
+void arc_cpu_reset(void *opaque)
+{
+ ARCCPU *cpu = opaque;
+ CPUARCState *env = &cpu->env;
+ const struct arc_boot_info *info = env->boot_info;
+
+ cpu_reset(CPU(cpu));
+
+ /*
+ * Right before start CPU gets reset wiping out everything
+ * but PC which we set on Elf load.
+ *
+ * And if we still want to pass something like U-Boot data
+ * via CPU registers we have to do it here.
+ */
+
+ if (info->kernel_cmdline && strlen(info->kernel_cmdline)) {
+ /*
+ * Load "cmdline" far enough from the kernel image.
+ * Round by MAX page size for ARC - 16 KiB.
+ */
+ hwaddr cmdline_addr = info->ram_start +
+ QEMU_ALIGN_UP(info->ram_size / 2, 16 * KiB);
+ cpu_physical_memory_write(cmdline_addr, info->kernel_cmdline,
+ strlen(info->kernel_cmdline));
+
+ /* We're passing "cmdline" */
+ cpu->env.r[0] = ARC_UBOOT_CMDLINE;
+ cpu->env.r[2] = cmdline_addr;
+ }
+}
+
+
+void arc_load_kernel(ARCCPU *cpu, struct arc_boot_info *info)
+{
+ hwaddr entry;
+ int elf_machine, kernel_size;
+
+ if (!info->kernel_filename) {
+ error_report("missing kernel file");
+ exit(EXIT_FAILURE);
+ }
+
+ elf_machine = cpu->env.family > 2 ? EM_ARC_COMPACT2 : EM_ARC_COMPACT;
+ kernel_size = load_elf(info->kernel_filename, NULL, NULL, NULL,
+ &entry, NULL, NULL, NULL, ARC_ENDIANNESS_LE,
+ elf_machine, 1, 0);
+
+ if (kernel_size < 0) {
+ int is_linux;
+
+ kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
+ &is_linux, NULL, NULL);
+ if (!is_linux) {
+ error_report("Wrong U-Boot image, only Linux kernel is supported");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if (kernel_size < 0) {
+ error_report("No kernel image found");
+ exit(EXIT_FAILURE);
+ }
+
+ cpu->env.boot_info = info;
+
+ /* Set CPU's PC to point to the entry-point */
+ cpu->env.pc = entry;
+}
+
+
+/*-*-indent-tabs-mode:nil;tab-width:4;indent-line-function:'insert-tab'-*-*/
+/* vim: set ts=4 sw=4 et: */
new file mode 100644
@@ -0,0 +1,21 @@
+#ifndef ARC_BOOT_H
+#define ARC_BOOT_H
+
+#include "hw/hw.h"
+#include "cpu.h"
+
+struct arc_boot_info {
+ hwaddr ram_start;
+ uint64_t ram_size;
+ const char *kernel_filename;
+ const char *kernel_cmdline;
+};
+
+void arc_cpu_reset(void *opaque);
+void arc_load_kernel(ARCCPU *cpu, struct arc_boot_info *boot_info);
+
+#endif /* ARC_BOOT_H */
+
+
+/*-*-indent-tabs-mode:nil;tab-width:4;indent-line-function:'insert-tab'-*-*/
+/* vim: set ts=4 sw=4 et: */
new file mode 100644
@@ -0,0 +1,13 @@
+arc_ss = ss.source_set()
+arc_ss.add(files(
+ 'arc_sim.c',
+ 'arc_uart.c',
+ 'sample.c',
+ 'pic_cpu.c',
+ 'boot.c',
+ 'board-hsdk.c',
+ 'sim-hs.c',
+ 'nsim.c',
+))
+
+hw_arch += {'arc': arc_ss}
new file mode 100644
@@ -0,0 +1,113 @@
+/*
+ * ARC Programmable Interrupt Controller support.
+ *
+ * Copyright (c) 2020 Synppsys Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "hw/hw.h"
+#include "hw/irq.h"
+#include "qemu/log.h"
+#include "hw/arc/cpudevs.h"
+
+/*
+ * ARC pic handler
+ */
+static void arc_pic_cpu_handler(void *opaque, int irq, int level)
+{
+ ARCCPU *cpu = (ARCCPU *) opaque;
+ CPUState *cs = CPU(cpu);
+ CPUARCState *env = &cpu->env;
+ int i;
+ bool clear = false;
+ uint32_t irq_bit;
+
+ /* Assert if this handler is called in a system without interrupts. */
+ assert(cpu->cfg.has_interrupts);
+
+ /* Assert if the IRQ is not within the cpu configuration bounds. */
+ assert(irq >= 16 && irq < (cpu->cfg.number_of_interrupts + 15));
+
+ irq_bit = 1 << env->irq_bank[irq].priority;
+ if (level) {
+ /*
+ * An interrupt is enabled, update irq_priority_pendig and rise
+ * the qemu interrupt line.
+ */
+ env->irq_bank[irq].pending = 1;
+ qatomic_or(&env->irq_priority_pending, irq_bit);
+ cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+ } else {
+ env->irq_bank[irq].pending = 0;
+
+ /*
+ * First, check if we still have any pending interrupt at the
+ * given priority.
+ */
+ clear = true;
+ for (i = 16; i < cpu->cfg.number_of_interrupts; i++) {
+ if (env->irq_bank[i].pending
+ && env->irq_bank[i].priority == env->irq_bank[irq].priority) {
+ clear = false;
+ break;
+ }
+ }
+
+ /* If not, update (clear) irq_priority_pending. */
+ if (clear) {
+ qatomic_and(&env->irq_priority_pending, ~irq_bit);
+ }
+
+ /*
+ * If we don't have any pending priority, lower the qemu irq
+ * line. N.B. we can also check more here like IE bit, but we
+ * need to add a cpu_interrupt call when we enable the
+ * interrupts (e.g., sleep, seti).
+ */
+ if (!env->irq_priority_pending) {
+ cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+ }
+ }
+ qemu_log_mask(CPU_LOG_INT,
+ "[IRQ] level = %d, clear = %d, irq = %d, priority = %d, "
+ "pending = %08x, pc = %08x\n",
+ level, clear, irq, env->irq_bank[irq].priority,
+ env->irq_priority_pending, env->pc);
+}
+
+/*
+ * ARC PIC initialization helper
+ */
+void cpu_arc_pic_init(ARCCPU *cpu)
+{
+ CPUARCState *env = &cpu->env;
+ int i;
+ qemu_irq *qi;
+
+ qi = qemu_allocate_irqs(arc_pic_cpu_handler, cpu,
+ 16 + cpu->cfg.number_of_interrupts);
+
+ for (i = 0; i < cpu->cfg.number_of_interrupts; i++) {
+ env->irq[16 + i] = qi[16 + i];
+ }
+}
+
+
+/*-*-indent-tabs-mode:nil;tab-width:4;indent-line-function:'insert-tab'-*-*/
+/* vim: set ts=4 sw=4 et: */
new file mode 100644
@@ -0,0 +1,107 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "boot.h"
+#include "hw/boards.h"
+#include "hw/char/serial.h"
+#include "exec/address-spaces.h"
+#include "sysemu/reset.h"
+#include "sysemu/sysemu.h"
+#include "hw/arc/cpudevs.h"
+#include "hw/sysbus.h"
+
+#define VIRT_RAM_BASE 0x80000000
+#define VIRT_RAM_SIZE 0x80000000
+#define VIRT_IO_BASE 0xf0000000
+#define VIRT_IO_SIZE 0x10000000
+#define VIRT_UART0_OFFSET 0x0
+#define VIRT_UART0_IRQ 24
+
+/* VirtIO */
+#define VIRT_VIRTIO_NUMBER 5
+#define VIRT_VIRTIO_OFFSET 0x100000
+#define VIRT_VIRTIO_BASE (VIRT_IO_BASE + VIRT_VIRTIO_OFFSET)
+#define VIRT_VIRTIO_SIZE 0x2000
+#define VIRT_VIRTIO_IRQ 31
+
+static void virt_init(MachineState *machine)
+{
+ static struct arc_boot_info boot_info;
+ unsigned int smp_cpus = machine->smp.cpus;
+ MemoryRegion *system_memory = get_system_memory();
+ MemoryRegion *system_ram;
+ MemoryRegion *system_io;
+ ARCCPU *cpu = NULL;
+ int n;
+
+ boot_info.ram_start = VIRT_RAM_BASE;
+ boot_info.ram_size = VIRT_RAM_SIZE;
+ boot_info.kernel_filename = machine->kernel_filename;
+ boot_info.kernel_cmdline = machine->kernel_cmdline;
+
+ for (n = 0; n < smp_cpus; n++) {
+ cpu = ARC_CPU(cpu_create("archs-" TYPE_ARC_CPU));
+ if (cpu == NULL) {
+ fprintf(stderr, "Unable to find CPU definition!\n");
+ exit(1);
+ }
+
+ /* Initialize internal devices. */
+ cpu_arc_pic_init(cpu);
+ cpu_arc_clock_init(cpu);
+
+ qemu_register_reset(arc_cpu_reset, cpu);
+ }
+
+ /* Init system DDR */
+ system_ram = g_new(MemoryRegion, 1);
+ memory_region_init_ram(system_ram, NULL, "arc.ram", VIRT_RAM_SIZE,
+ &error_fatal);
+ memory_region_add_subregion(system_memory, VIRT_RAM_BASE, system_ram);
+
+ /* Init IO area */
+ system_io = g_new(MemoryRegion, 1);
+ memory_region_init_io(system_io, NULL, NULL, NULL, "arc.io",
+ VIRT_IO_SIZE);
+ memory_region_add_subregion(system_memory, VIRT_IO_BASE, system_io);
+
+ serial_mm_init(system_io, VIRT_UART0_OFFSET, 2,
+ cpu->env.irq[VIRT_UART0_IRQ], 115200, serial_hd(0),
+ DEVICE_NATIVE_ENDIAN);
+
+ for (n = 0; n < VIRT_VIRTIO_NUMBER; n++) {
+ sysbus_create_simple("virtio-mmio",
+ VIRT_VIRTIO_BASE + VIRT_VIRTIO_SIZE * n,
+ cpu->env.irq[VIRT_VIRTIO_IRQ + n]);
+ }
+
+ arc_load_kernel(cpu, &boot_info);
+}
+
+static void virt_machine_init(MachineClass *mc)
+{
+ mc->desc = "ARC Virtual Machine";
+ mc->init = virt_init;
+ mc->max_cpus = 1;
+ mc->is_default = true;
+}
+
+DEFINE_MACHINE("virt", virt_machine_init)
+
+
+/*-*-indent-tabs-mode:nil;tab-width:4;indent-line-function:'insert-tab'-*-*/
+/* vim: set ts=4 sw=4 et: */
new file mode 100644
@@ -0,0 +1,30 @@
+/*
+ * QEMU ARC CPU
+ *
+ * Copyright (c) 2020 Synppsys Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+
+#ifndef HW_ARC_CPUDEVS_H
+#define HW_ARC_CPUDEVS_H
+
+/* Timer service routines. */
+extern void cpu_arc_clock_init(ARCCPU *);
+
+/* PIC service routines. */
+extern void cpu_arc_pic_init(ARCCPU *);
+
+#endif /* !HW_ARC_CPUDEVS_H */