qemu/hw/xtensa/sim.c
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   1/*
   2 * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   3 * All rights reserved.
   4 *
   5 * Redistribution and use in source and binary forms, with or without
   6 * modification, are permitted provided that the following conditions are met:
   7 *     * Redistributions of source code must retain the above copyright
   8 *       notice, this list of conditions and the following disclaimer.
   9 *     * Redistributions in binary form must reproduce the above copyright
  10 *       notice, this list of conditions and the following disclaimer in the
  11 *       documentation and/or other materials provided with the distribution.
  12 *     * Neither the name of the Open Source and Linux Lab nor the
  13 *       names of its contributors may be used to endorse or promote products
  14 *       derived from this software without specific prior written permission.
  15 *
  16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 */
  27
  28#include "qemu/osdep.h"
  29#include "qapi/error.h"
  30#include "qemu-common.h"
  31#include "cpu.h"
  32#include "sysemu/sysemu.h"
  33#include "hw/boards.h"
  34#include "hw/loader.h"
  35#include "elf.h"
  36#include "exec/memory.h"
  37#include "exec/address-spaces.h"
  38#include "qemu/error-report.h"
  39
  40static uint64_t translate_phys_addr(void *opaque, uint64_t addr)
  41{
  42    XtensaCPU *cpu = opaque;
  43
  44    return cpu_get_phys_page_debug(CPU(cpu), addr);
  45}
  46
  47static void sim_reset(void *opaque)
  48{
  49    XtensaCPU *cpu = opaque;
  50
  51    cpu_reset(CPU(cpu));
  52}
  53
  54static void xtensa_sim_init(MachineState *machine)
  55{
  56    XtensaCPU *cpu = NULL;
  57    CPUXtensaState *env = NULL;
  58    MemoryRegion *ram, *rom;
  59    ram_addr_t ram_size = machine->ram_size;
  60    const char *cpu_model = machine->cpu_model;
  61    const char *kernel_filename = machine->kernel_filename;
  62    int n;
  63
  64    if (!cpu_model) {
  65        cpu_model = XTENSA_DEFAULT_CPU_MODEL;
  66    }
  67
  68    for (n = 0; n < smp_cpus; n++) {
  69        cpu = cpu_xtensa_init(cpu_model);
  70        if (cpu == NULL) {
  71            error_report("unable to find CPU definition '%s'",
  72                         cpu_model);
  73            exit(EXIT_FAILURE);
  74        }
  75        env = &cpu->env;
  76
  77        env->sregs[PRID] = n;
  78        qemu_register_reset(sim_reset, cpu);
  79        /* Need MMU initialized prior to ELF loading,
  80         * so that ELF gets loaded into virtual addresses
  81         */
  82        sim_reset(cpu);
  83    }
  84
  85    ram = g_malloc(sizeof(*ram));
  86    memory_region_init_ram(ram, NULL, "xtensa.sram", ram_size, &error_fatal);
  87    vmstate_register_ram_global(ram);
  88    memory_region_add_subregion(get_system_memory(), 0, ram);
  89
  90    rom = g_malloc(sizeof(*rom));
  91    memory_region_init_ram(rom, NULL, "xtensa.rom", 0x1000, &error_fatal);
  92    vmstate_register_ram_global(rom);
  93    memory_region_add_subregion(get_system_memory(), 0xfe000000, rom);
  94
  95    if (kernel_filename) {
  96        uint64_t elf_entry;
  97        uint64_t elf_lowaddr;
  98#ifdef TARGET_WORDS_BIGENDIAN
  99        int success = load_elf(kernel_filename, translate_phys_addr, cpu,
 100                &elf_entry, &elf_lowaddr, NULL, 1, EM_XTENSA, 0, 0);
 101#else
 102        int success = load_elf(kernel_filename, translate_phys_addr, cpu,
 103                &elf_entry, &elf_lowaddr, NULL, 0, EM_XTENSA, 0, 0);
 104#endif
 105        if (success > 0) {
 106            env->pc = elf_entry;
 107        }
 108    }
 109}
 110
 111static void xtensa_sim_machine_init(MachineClass *mc)
 112{
 113    mc->desc = "sim machine (" XTENSA_DEFAULT_CPU_MODEL ")";
 114    mc->is_default = true;
 115    mc->init = xtensa_sim_init;
 116    mc->max_cpus = 4;
 117}
 118
 119DEFINE_MACHINE("sim", xtensa_sim_machine_init)
 120