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