hw/xtensa/sim.c

   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 "sysemu/sysemu.h"
  30 #include "hw/boards.h"
  31 #include "hw/loader.h"
  32 #include "elf.h"
  33 #include "exec/memory.h"
  34 #include "exec/address-spaces.h"
  35 #include "qemu/error-report.h"
  36
  37 static uint64_t translate_phys_addr(void *opaque, uint64_t addr)
  38 {
  39     XtensaCPU *cpu = opaque;
  40
  41     return cpu_get_phys_page_debug(CPU(cpu), addr);
  42 }
  43
  44 static void sim_reset(void *opaque)
  45 {
  46     XtensaCPU *cpu = opaque;
  47
  48     cpu_reset(CPU(cpu));
  49 }
  50
  51 static void xtensa_sim_init(MachineState *machine)
  52 {
  53     XtensaCPU *cpu = NULL;
  54     CPUXtensaState *env = NULL;
  55     MemoryRegion *ram, *rom;
  56     ram_addr_t ram_size = machine->ram_size;
  57     const char *cpu_model = machine->cpu_model;
  58     const char *kernel_filename = machine->kernel_filename;
  59     int n;
  60
  61     if (!cpu_model) {
  62         cpu_model = XTENSA_DEFAULT_CPU_MODEL;
  63     }
  64
  65     for (n = 0; n < smp_cpus; n++) {
  66         cpu = cpu_xtensa_init(cpu_model);
  67         if (cpu == NULL) {
  68             error_report("unable to find CPU definition '%s'",
  69                          cpu_model);
  70             exit(EXIT_FAILURE);
  71         }
  72         env = &cpu->env;
  73
  74         env->sregs[PRID] = n;
  75         qemu_register_reset(sim_reset, cpu);
  76         /* Need MMU initialized prior to ELF loading,
  77          * so that ELF gets loaded into virtual addresses
  78          */
  79         sim_reset(cpu);
  80     }
  81
  82     ram = g_malloc(sizeof(*ram));
  83     memory_region_init_ram(ram, NULL, "xtensa.sram", ram_size, &error_fatal);
  84     vmstate_register_ram_global(ram);
  85     memory_region_add_subregion(get_system_memory(), 0, ram);
  86
  87     rom = g_malloc(sizeof(*rom));
  88     memory_region_init_ram(rom, NULL, "xtensa.rom", 0x1000, &error_fatal);
  89     vmstate_register_ram_global(rom);
  90     memory_region_add_subregion(get_system_memory(), 0xfe000000, rom);
  91
  92     if (kernel_filename) {
  93         uint64_t elf_entry;
  94         uint64_t elf_lowaddr;
  95 #ifdef TARGET_WORDS_BIGENDIAN
  96         int success = load_elf(kernel_filename, translate_phys_addr, cpu,
  97                 &elf_entry, &elf_lowaddr, NULL, 1, EM_XTENSA, 0, 0);
  98 #else
  99         int success = load_elf(kernel_filename, translate_phys_addr, cpu,
 100                 &elf_entry, &elf_lowaddr, NULL, 0, EM_XTENSA, 0, 0);
 101 #endif
 102         if (success > 0) {
 103             env->pc = elf_entry;
 104         }
 105     }
 106 }
 107
 108 static void xtensa_sim_machine_init(MachineClass *mc)
 109 {
 110     mc->desc = "sim machine (" XTENSA_DEFAULT_CPU_MODEL ")";
 111     mc->is_default = true;
 112     mc->init = xtensa_sim_init;
 113     mc->max_cpus = 4;
 114 }
 115
 116 DEFINE_MACHINE("sim", xtensa_sim_machine_init)