hw: move boards and other isolated files to hw/ARCH

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

4 files changed, 597 insertions, 3 deletions

diff --git a/hw/xtensa/Makefile.objs b/hw/xtensa/Makefile.objs
index 79698e903d..6ead7820c4 100644
--- a/hw/xtensa/Makefile.objs
+++ b/hw/xtensa/Makefile.objs
@@ -1,5 +1,3 @@
-obj-y += xtensa_pic.o
+obj-y += pic_cpu.o
 obj-y += xtensa_sim.o
 obj-y += xtensa_lx60.o
-
-obj-y := $(addprefix ../,$(obj-y))
diff --git a/hw/xtensa/pic_cpu.c b/hw/xtensa/pic_cpu.c
new file mode 100644
index 0000000000..f485a1465c
--- /dev/null
+++ b/hw/xtensa/pic_cpu.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the Open Source and Linux Lab nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "hw/hw.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+
+void xtensa_advance_ccount(CPUXtensaState *env, uint32_t d)
+{
+    uint32_t old_ccount = env->sregs[CCOUNT];
+
+    env->sregs[CCOUNT] += d;
+
+    if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {
+        int i;
+        for (i = 0; i < env->config->nccompare; ++i) {
+            if (env->sregs[CCOMPARE + i] - old_ccount <= d) {
+                xtensa_timer_irq(env, i, 1);
+            }
+        }
+    }
+}
+
+void check_interrupts(CPUXtensaState *env)
+{
+    int minlevel = xtensa_get_cintlevel(env);
+    uint32_t int_set_enabled = env->sregs[INTSET] & env->sregs[INTENABLE];
+    int level;
+
+    /* If the CPU is halted advance CCOUNT according to the vm_clock time
+     * elapsed since the moment when it was advanced last time.
+     */
+    if (env->halted) {
+        int64_t now = qemu_get_clock_ns(vm_clock);
+
+        xtensa_advance_ccount(env,
+                muldiv64(now - env->halt_clock,
+                    env->config->clock_freq_khz, 1000000));
+        env->halt_clock = now;
+    }
+    for (level = env->config->nlevel; level > minlevel; --level) {
+        if (env->config->level_mask[level] & int_set_enabled) {
+            env->pending_irq_level = level;
+            cpu_interrupt(env, CPU_INTERRUPT_HARD);
+            qemu_log_mask(CPU_LOG_INT,
+                    "%s level = %d, cintlevel = %d, "
+                    "pc = %08x, a0 = %08x, ps = %08x, "
+                    "intset = %08x, intenable = %08x, "
+                    "ccount = %08x\n",
+                    __func__, level, xtensa_get_cintlevel(env),
+                    env->pc, env->regs[0], env->sregs[PS],
+                    env->sregs[INTSET], env->sregs[INTENABLE],
+                    env->sregs[CCOUNT]);
+            return;
+        }
+    }
+    env->pending_irq_level = 0;
+    cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
+}
+
+static void xtensa_set_irq(void *opaque, int irq, int active)
+{
+    CPUXtensaState *env = opaque;
+
+    if (irq >= env->config->ninterrupt) {
+        qemu_log("%s: bad IRQ %d\n", __func__, irq);
+    } else {
+        uint32_t irq_bit = 1 << irq;
+
+        if (active) {
+            env->sregs[INTSET] |= irq_bit;
+        } else if (env->config->interrupt[irq].inttype == INTTYPE_LEVEL) {
+            env->sregs[INTSET] &= ~irq_bit;
+        }
+
+        check_interrupts(env);
+    }
+}
+
+void xtensa_timer_irq(CPUXtensaState *env, uint32_t id, uint32_t active)
+{
+    qemu_set_irq(env->irq_inputs[env->config->timerint[id]], active);
+}
+
+void xtensa_rearm_ccompare_timer(CPUXtensaState *env)
+{
+    int i;
+    uint32_t wake_ccount = env->sregs[CCOUNT] - 1;
+
+    for (i = 0; i < env->config->nccompare; ++i) {
+        if (env->sregs[CCOMPARE + i] - env->sregs[CCOUNT] <
+                wake_ccount - env->sregs[CCOUNT]) {
+            wake_ccount = env->sregs[CCOMPARE + i];
+        }
+    }
+    env->wake_ccount = wake_ccount;
+    qemu_mod_timer(env->ccompare_timer, env->halt_clock +
+            muldiv64(wake_ccount - env->sregs[CCOUNT],
+                1000000, env->config->clock_freq_khz));
+}
+
+static void xtensa_ccompare_cb(void *opaque)
+{
+    XtensaCPU *cpu = opaque;
+    CPUXtensaState *env = &cpu->env;
+
+    if (env->halted) {
+        env->halt_clock = qemu_get_clock_ns(vm_clock);
+        xtensa_advance_ccount(env, env->wake_ccount - env->sregs[CCOUNT]);
+        if (!cpu_has_work(CPU(cpu))) {
+            env->sregs[CCOUNT] = env->wake_ccount + 1;
+            xtensa_rearm_ccompare_timer(env);
+        }
+    }
+}
+
+void xtensa_irq_init(CPUXtensaState *env)
+{
+    XtensaCPU *cpu = xtensa_env_get_cpu(env);
+
+    env->irq_inputs = (void **)qemu_allocate_irqs(
+            xtensa_set_irq, env, env->config->ninterrupt);
+    if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT) &&
+            env->config->nccompare > 0) {
+        env->ccompare_timer =
+            qemu_new_timer_ns(vm_clock, &xtensa_ccompare_cb, cpu);
+    }
+}
+
+void *xtensa_get_extint(CPUXtensaState *env, unsigned extint)
+{
+    if (extint < env->config->nextint) {
+        unsigned irq = env->config->extint[extint];
+        return env->irq_inputs[irq];
+    } else {
+        qemu_log("%s: trying to acquire invalid external interrupt %d\n",
+                __func__, extint);
+        return NULL;
+    }
+}
diff --git a/hw/xtensa/xtensa_lx60.c b/hw/xtensa/xtensa_lx60.c
new file mode 100644
index 0000000000..f2a63d82da
--- /dev/null
+++ b/hw/xtensa/xtensa_lx60.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the Open Source and Linux Lab nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sysemu/sysemu.h"
+#include "hw/boards.h"
+#include "hw/loader.h"
+#include "elf.h"
+#include "exec/memory.h"
+#include "exec/address-spaces.h"
+#include "hw/serial.h"
+#include "net/net.h"
+#include "hw/sysbus.h"
+#include "hw/flash.h"
+#include "sysemu/blockdev.h"
+#include "char/char.h"
+#include "hw/xtensa_bootparam.h"
+
+typedef struct LxBoardDesc {
+    size_t flash_size;
+    size_t flash_sector_size;
+    size_t sram_size;
+} LxBoardDesc;
+
+typedef struct Lx60FpgaState {
+    MemoryRegion iomem;
+    uint32_t leds;
+    uint32_t switches;
+} Lx60FpgaState;
+
+static void lx60_fpga_reset(void *opaque)
+{
+    Lx60FpgaState *s = opaque;
+
+    s->leds = 0;
+    s->switches = 0;
+}
+
+static uint64_t lx60_fpga_read(void *opaque, hwaddr addr,
+        unsigned size)
+{
+    Lx60FpgaState *s = opaque;
+
+    switch (addr) {
+    case 0x0: /*build date code*/
+        return 0x09272011;
+
+    case 0x4: /*processor clock frequency, Hz*/
+        return 10000000;
+
+    case 0x8: /*LEDs (off = 0, on = 1)*/
+        return s->leds;
+
+    case 0xc: /*DIP switches (off = 0, on = 1)*/
+        return s->switches;
+    }
+    return 0;
+}
+
+static void lx60_fpga_write(void *opaque, hwaddr addr,
+        uint64_t val, unsigned size)
+{
+    Lx60FpgaState *s = opaque;
+
+    switch (addr) {
+    case 0x8: /*LEDs (off = 0, on = 1)*/
+        s->leds = val;
+        break;
+
+    case 0x10: /*board reset*/
+        if (val == 0xdead) {
+            qemu_system_reset_request();
+        }
+        break;
+    }
+}
+
+static const MemoryRegionOps lx60_fpga_ops = {
+    .read = lx60_fpga_read,
+    .write = lx60_fpga_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static Lx60FpgaState *lx60_fpga_init(MemoryRegion *address_space,
+        hwaddr base)
+{
+    Lx60FpgaState *s = g_malloc(sizeof(Lx60FpgaState));
+
+    memory_region_init_io(&s->iomem, &lx60_fpga_ops, s,
+            "lx60.fpga", 0x10000);
+    memory_region_add_subregion(address_space, base, &s->iomem);
+    lx60_fpga_reset(s);
+    qemu_register_reset(lx60_fpga_reset, s);
+    return s;
+}
+
+static void lx60_net_init(MemoryRegion *address_space,
+        hwaddr base,
+        hwaddr descriptors,
+        hwaddr buffers,
+        qemu_irq irq, NICInfo *nd)
+{
+    DeviceState *dev;
+    SysBusDevice *s;
+    MemoryRegion *ram;
+
+    dev = qdev_create(NULL, "open_eth");
+    qdev_set_nic_properties(dev, nd);
+    qdev_init_nofail(dev);
+
+    s = SYS_BUS_DEVICE(dev);
+    sysbus_connect_irq(s, 0, irq);
+    memory_region_add_subregion(address_space, base,
+            sysbus_mmio_get_region(s, 0));
+    memory_region_add_subregion(address_space, descriptors,
+            sysbus_mmio_get_region(s, 1));
+
+    ram = g_malloc(sizeof(*ram));
+    memory_region_init_ram(ram, "open_eth.ram", 16384);
+    vmstate_register_ram_global(ram);
+    memory_region_add_subregion(address_space, buffers, ram);
+}
+
+static uint64_t translate_phys_addr(void *env, uint64_t addr)
+{
+    return cpu_get_phys_page_debug(env, addr);
+}
+
+static void lx60_reset(void *opaque)
+{
+    XtensaCPU *cpu = opaque;
+
+    cpu_reset(CPU(cpu));
+}
+
+static void lx_init(const LxBoardDesc *board, QEMUMachineInitArgs *args)
+{
+#ifdef TARGET_WORDS_BIGENDIAN
+    int be = 1;
+#else
+    int be = 0;
+#endif
+    MemoryRegion *system_memory = get_system_memory();
+    XtensaCPU *cpu = NULL;
+    CPUXtensaState *env = NULL;
+    MemoryRegion *ram, *rom, *system_io;
+    DriveInfo *dinfo;
+    pflash_t *flash = NULL;
+    const char *cpu_model = args->cpu_model;
+    const char *kernel_filename = args->kernel_filename;
+    const char *kernel_cmdline = args->kernel_cmdline;
+    int n;
+
+    if (!cpu_model) {
+        cpu_model = XTENSA_DEFAULT_CPU_MODEL;
+    }
+
+    for (n = 0; n < smp_cpus; n++) {
+        cpu = cpu_xtensa_init(cpu_model);
+        if (cpu == NULL) {
+            fprintf(stderr, "Unable to find CPU definition\n");
+            exit(1);
+        }
+        env = &cpu->env;
+
+        env->sregs[PRID] = n;
+        qemu_register_reset(lx60_reset, cpu);
+        /* Need MMU initialized prior to ELF loading,
+         * so that ELF gets loaded into virtual addresses
+         */
+        cpu_reset(CPU(cpu));
+    }
+
+    ram = g_malloc(sizeof(*ram));
+    memory_region_init_ram(ram, "lx60.dram", args->ram_size);
+    vmstate_register_ram_global(ram);
+    memory_region_add_subregion(system_memory, 0, ram);
+
+    system_io = g_malloc(sizeof(*system_io));
+    memory_region_init(system_io, "lx60.io", 224 * 1024 * 1024);
+    memory_region_add_subregion(system_memory, 0xf0000000, system_io);
+    lx60_fpga_init(system_io, 0x0d020000);
+    if (nd_table[0].used) {
+        lx60_net_init(system_io, 0x0d030000, 0x0d030400, 0x0d800000,
+                xtensa_get_extint(env, 1), nd_table);
+    }
+
+    if (!serial_hds[0]) {
+        serial_hds[0] = qemu_chr_new("serial0", "null", NULL);
+    }
+
+    serial_mm_init(system_io, 0x0d050020, 2, xtensa_get_extint(env, 0),
+            115200, serial_hds[0], DEVICE_NATIVE_ENDIAN);
+
+    dinfo = drive_get(IF_PFLASH, 0, 0);
+    if (dinfo) {
+        flash = pflash_cfi01_register(0xf8000000,
+                NULL, "lx60.io.flash", board->flash_size,
+                dinfo->bdrv, board->flash_sector_size,
+                board->flash_size / board->flash_sector_size,
+                4, 0x0000, 0x0000, 0x0000, 0x0000, be);
+        if (flash == NULL) {
+            fprintf(stderr, "Unable to mount pflash\n");
+            exit(1);
+        }
+    }
+
+    /* Use presence of kernel file name as 'boot from SRAM' switch. */
+    if (kernel_filename) {
+        rom = g_malloc(sizeof(*rom));
+        memory_region_init_ram(rom, "lx60.sram", board->sram_size);
+        vmstate_register_ram_global(rom);
+        memory_region_add_subregion(system_memory, 0xfe000000, rom);
+
+        /* Put kernel bootparameters to the end of that SRAM */
+        if (kernel_cmdline) {
+            size_t cmdline_size = strlen(kernel_cmdline) + 1;
+            size_t bp_size = sizeof(BpTag[4]) + cmdline_size;
+            uint32_t tagptr = (0xfe000000 + board->sram_size - bp_size) & ~0xff;
+
+            env->regs[2] = tagptr;
+
+            tagptr = put_tag(tagptr, 0x7b0b, 0, NULL);
+            if (cmdline_size > 1) {
+                tagptr = put_tag(tagptr, 0x1001,
+                        cmdline_size, kernel_cmdline);
+            }
+            tagptr = put_tag(tagptr, 0x7e0b, 0, NULL);
+        }
+        uint64_t elf_entry;
+        uint64_t elf_lowaddr;
+        int success = load_elf(kernel_filename, translate_phys_addr, env,
+                &elf_entry, &elf_lowaddr, NULL, be, ELF_MACHINE, 0);
+        if (success > 0) {
+            env->pc = elf_entry;
+        }
+    } else {
+        if (flash) {
+            MemoryRegion *flash_mr = pflash_cfi01_get_memory(flash);
+            MemoryRegion *flash_io = g_malloc(sizeof(*flash_io));
+
+            memory_region_init_alias(flash_io, "lx60.flash",
+                    flash_mr, 0, board->flash_size);
+            memory_region_add_subregion(system_memory, 0xfe000000,
+                    flash_io);
+        }
+    }
+}
+
+static void xtensa_lx60_init(QEMUMachineInitArgs *args)
+{
+    static const LxBoardDesc lx60_board = {
+        .flash_size = 0x400000,
+        .flash_sector_size = 0x10000,
+        .sram_size = 0x20000,
+    };
+    lx_init(&lx60_board, args);
+}
+
+static void xtensa_lx200_init(QEMUMachineInitArgs *args)
+{
+    static const LxBoardDesc lx200_board = {
+        .flash_size = 0x1000000,
+        .flash_sector_size = 0x20000,
+        .sram_size = 0x2000000,
+    };
+    lx_init(&lx200_board, args);
+}
+
+static QEMUMachine xtensa_lx60_machine = {
+    .name = "lx60",
+    .desc = "lx60 EVB (" XTENSA_DEFAULT_CPU_MODEL ")",
+    .init = xtensa_lx60_init,
+    .max_cpus = 4,
+    DEFAULT_MACHINE_OPTIONS,
+};
+
+static QEMUMachine xtensa_lx200_machine = {
+    .name = "lx200",
+    .desc = "lx200 EVB (" XTENSA_DEFAULT_CPU_MODEL ")",
+    .init = xtensa_lx200_init,
+    .max_cpus = 4,
+    DEFAULT_MACHINE_OPTIONS,
+};
+
+static void xtensa_lx_machines_init(void)
+{
+    qemu_register_machine(&xtensa_lx60_machine);
+    qemu_register_machine(&xtensa_lx200_machine);
+}
+
+machine_init(xtensa_lx_machines_init);
diff --git a/hw/xtensa/xtensa_sim.c b/hw/xtensa/xtensa_sim.c
new file mode 100644
index 0000000000..5241f8d734
--- /dev/null
+++ b/hw/xtensa/xtensa_sim.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the Open Source and Linux Lab nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sysemu/sysemu.h"
+#include "hw/boards.h"
+#include "hw/loader.h"
+#include "elf.h"
+#include "exec/memory.h"
+#include "exec/address-spaces.h"
+
+static uint64_t translate_phys_addr(void *env, uint64_t addr)
+{
+    return cpu_get_phys_page_debug(env, addr);
+}
+
+static void sim_reset(void *opaque)
+{
+    XtensaCPU *cpu = opaque;
+
+    cpu_reset(CPU(cpu));
+}
+
+static void xtensa_sim_init(QEMUMachineInitArgs *args)
+{
+    XtensaCPU *cpu = NULL;
+    CPUXtensaState *env = NULL;
+    MemoryRegion *ram, *rom;
+    ram_addr_t ram_size = args->ram_size;
+    const char *cpu_model = args->cpu_model;
+    const char *kernel_filename = args->kernel_filename;
+    int n;
+
+    if (!cpu_model) {
+        cpu_model = XTENSA_DEFAULT_CPU_MODEL;
+    }
+
+    for (n = 0; n < smp_cpus; n++) {
+        cpu = cpu_xtensa_init(cpu_model);
+        if (cpu == NULL) {
+            fprintf(stderr, "Unable to find CPU definition\n");
+            exit(1);
+        }
+        env = &cpu->env;
+
+        env->sregs[PRID] = n;
+        qemu_register_reset(sim_reset, cpu);
+        /* Need MMU initialized prior to ELF loading,
+         * so that ELF gets loaded into virtual addresses
+         */
+        sim_reset(cpu);
+    }
+
+    ram = g_malloc(sizeof(*ram));
+    memory_region_init_ram(ram, "xtensa.sram", ram_size);
+    vmstate_register_ram_global(ram);
+    memory_region_add_subregion(get_system_memory(), 0, ram);
+
+    rom = g_malloc(sizeof(*rom));
+    memory_region_init_ram(rom, "xtensa.rom", 0x1000);
+    vmstate_register_ram_global(rom);
+    memory_region_add_subregion(get_system_memory(), 0xfe000000, rom);
+
+    if (kernel_filename) {
+        uint64_t elf_entry;
+        uint64_t elf_lowaddr;
+#ifdef TARGET_WORDS_BIGENDIAN
+        int success = load_elf(kernel_filename, translate_phys_addr, env,
+                &elf_entry, &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);
+#else
+        int success = load_elf(kernel_filename, translate_phys_addr, env,
+                &elf_entry, &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
+#endif
+        if (success > 0) {
+            env->pc = elf_entry;
+        }
+    }
+}
+
+static QEMUMachine xtensa_sim_machine = {
+    .name = "sim",
+    .desc = "sim machine (" XTENSA_DEFAULT_CPU_MODEL ")",
+    .is_default = true,
+    .init = xtensa_sim_init,
+    .max_cpus = 4,
+    DEFAULT_MACHINE_OPTIONS,
+};
+
+static void xtensa_sim_machine_init(void)
+{
+    qemu_register_machine(&xtensa_sim_machine);
+}
+
+machine_init(xtensa_sim_machine_init);