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 *opaque)
  41 {
  42     XtensaCPU *cpu = opaque;
  43
  44     cpu_reset(CPU(cpu));
  45 }
  46
  47 static void sim_init(ram_addr_t ram_size,
  48         const char *boot_device,
  49         const char *kernel_filename, const char *kernel_cmdline,
  50         const char *initrd_filename, const char *cpu_model)
  51 {
  52     XtensaCPU *cpu = NULL;
  53     CPUXtensaState *env = NULL;
  54     MemoryRegion *ram, *rom;
  55     int n;
  56
  57     for (n = 0; n < smp_cpus; n++) {
  58         cpu = cpu_xtensa_init(cpu_model);
  59         if (cpu == NULL) {
  60             fprintf(stderr, "Unable to find CPU definition\n");
  61             exit(1);
  62         }
  63         env = &cpu->env;
  64
  65         env->sregs[PRID] = n;
  66         qemu_register_reset(sim_reset, cpu);
  67         /* Need MMU initialized prior to ELF loading,
  68          * so that ELF gets loaded into virtual addresses
  69          */
  70         sim_reset(cpu);
  71     }
  72
  73     ram = g_malloc(sizeof(*ram));
  74     memory_region_init_ram(ram, "xtensa.sram", ram_size);
  75     vmstate_register_ram_global(ram);
  76     memory_region_add_subregion(get_system_memory(), 0, ram);
  77
  78     rom = g_malloc(sizeof(*rom));
  79     memory_region_init_ram(rom, "xtensa.rom", 0x1000);
  80     vmstate_register_ram_global(rom);
  81     memory_region_add_subregion(get_system_memory(), 0xfe000000, rom);
  82
  83     if (kernel_filename) {
  84         uint64_t elf_entry;
  85         uint64_t elf_lowaddr;
  86 #ifdef TARGET_WORDS_BIGENDIAN
  87         int success = load_elf(kernel_filename, translate_phys_addr, env,
  88                 &elf_entry, &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);
  89 #else
  90         int success = load_elf(kernel_filename, translate_phys_addr, env,
  91                 &elf_entry, &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
  92 #endif
  93         if (success > 0) {
  94             env->pc = elf_entry;
  95         }
  96     }
  97 }
  98
  99 static void xtensa_sim_init(QEMUMachineInitArgs *args)
 100 {
 101     ram_addr_t ram_size = args->ram_size;
 102     const char *cpu_model = args->cpu_model;
 103     const char *kernel_filename = args->kernel_filename;
 104     const char *kernel_cmdline = args->kernel_cmdline;
 105     const char *initrd_filename = args->initrd_filename;
 106     const char *boot_device = args->boot_device;
 107     if (!cpu_model) {
 108         cpu_model = XTENSA_DEFAULT_CPU_MODEL;
 109     }
 110     sim_init(ram_size, boot_device, kernel_filename, kernel_cmdline,
 111             initrd_filename, cpu_model);
 112 }
 113
 114 static QEMUMachine xtensa_sim_machine = {
 115     .name = "sim",
 116     .desc = "sim machine (" XTENSA_DEFAULT_CPU_MODEL ")",
 117     .is_default = true,
 118     .init = xtensa_sim_init,
 119     .max_cpus = 4,
 120 };
 121
 122 static void xtensa_sim_machine_init(void)
 123 {
 124     qemu_register_machine(&xtensa_sim_machine);
 125 }
 126
 127 machine_init(xtensa_sim_machine_init);