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.h"
  29 #include "boards.h"
  30 #include "loader.h"
  31 #include "elf.h"
  32 #include "memory.h"
  33 #include "exec-memory.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 *env)
  41 {
  42     cpu_state_reset(env);
  43 }
  44
  45 static void sim_init(ram_addr_t ram_size,
  46         const char *boot_device,
  47         const char *kernel_filename, const char *kernel_cmdline,
  48         const char *initrd_filename, const char *cpu_model)
  49 {
  50     CPUXtensaState *env = NULL;
  51     MemoryRegion *ram, *rom;
  52     int n;
  53
  54     for (n = 0; n < smp_cpus; n++) {
  55         env = cpu_init(cpu_model);
  56         if (!env) {
  57             fprintf(stderr, "Unable to find CPU definition\n");
  58             exit(1);
  59         }
  60         env->sregs[PRID] = n;
  61         qemu_register_reset(sim_reset, env);
  62         /* Need MMU initialized prior to ELF loading,
  63          * so that ELF gets loaded into virtual addresses
  64          */
  65         sim_reset(env);
  66     }
  67
  68     ram = g_malloc(sizeof(*ram));
  69     memory_region_init_ram(ram, "xtensa.sram", ram_size);
  70     vmstate_register_ram_global(ram);
  71     memory_region_add_subregion(get_system_memory(), 0, ram);
  72
  73     rom = g_malloc(sizeof(*rom));
  74     memory_region_init_ram(rom, "xtensa.rom", 0x1000);
  75     vmstate_register_ram_global(rom);
  76     memory_region_add_subregion(get_system_memory(), 0xfe000000, rom);
  77
  78     if (kernel_filename) {
  79         uint64_t elf_entry;
  80         uint64_t elf_lowaddr;
  81 #ifdef TARGET_WORDS_BIGENDIAN
  82         int success = load_elf(kernel_filename, translate_phys_addr, env,
  83                 &elf_entry, &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);
  84 #else
  85         int success = load_elf(kernel_filename, translate_phys_addr, env,
  86                 &elf_entry, &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
  87 #endif
  88         if (success > 0) {
  89             env->pc = elf_entry;
  90         }
  91     }
  92 }
  93
  94 static void xtensa_sim_init(ram_addr_t ram_size,
  95                      const char *boot_device,
  96                      const char *kernel_filename, const char *kernel_cmdline,
  97                      const char *initrd_filename, const char *cpu_model)
  98 {
  99     if (!cpu_model) {
 100         cpu_model = "dc232b";
 101     }
 102     sim_init(ram_size, boot_device, kernel_filename, kernel_cmdline,
 103             initrd_filename, cpu_model);
 104 }
 105
 106 static QEMUMachine xtensa_sim_machine = {
 107     .name = "sim",
 108     .desc = "sim machine (dc232b)",
 109     .init = xtensa_sim_init,
 110     .max_cpus = 4,
 111 };
 112
 113 static void xtensa_sim_machine_init(void)
 114 {
 115     qemu_register_machine(&xtensa_sim_machine);
 116 }
 117
 118 machine_init(xtensa_sim_machine_init);