hw/xtensa_sample.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 void xtensa_sample_reset(void *env)
  36 {
  37     cpu_reset(env);
  38 }
  39
  40 static void xtensa_init(ram_addr_t ram_size,
  41         const char *boot_device,
  42         const char *kernel_filename, const char *kernel_cmdline,
  43         const char *initrd_filename, const char *cpu_model)
  44 {
  45     CPUState *env = NULL;
  46     MemoryRegion *ram;
  47     const size_t dram_size = 0x10000;
  48     const size_t iram_size = 0x20000;
  49     int n;
  50
  51     for (n = 0; n < smp_cpus; n++) {
  52         env = cpu_init(cpu_model);
  53         if (!env) {
  54             fprintf(stderr, "Unable to find CPU definition\n");
  55             exit(1);
  56         }
  57         qemu_register_reset(xtensa_sample_reset, env);
  58         env->sregs[PRID] = n;
  59     }
  60
  61     ram = g_malloc(sizeof(*ram));
  62     memory_region_init_ram(ram, NULL, "xtensa.ram",
  63             dram_size + iram_size + ram_size);
  64     memory_region_add_subregion(get_system_memory(),
  65             0x60000000 - dram_size - iram_size, ram);
  66
  67     if (kernel_filename) {
  68         uint64_t elf_entry;
  69         uint64_t elf_lowaddr;
  70 #ifdef TARGET_WORDS_BIGENDIAN
  71         int success = load_elf(kernel_filename, NULL, NULL, &elf_entry,
  72                 &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);
  73 #else
  74         int success = load_elf(kernel_filename, NULL, NULL, &elf_entry,
  75                 &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
  76 #endif
  77         if (success > 0) {
  78             env->pc = elf_entry;
  79         }
  80     }
  81 }
  82
  83 static void xtensa_sample_init(ram_addr_t ram_size,
  84                      const char *boot_device,
  85                      const char *kernel_filename, const char *kernel_cmdline,
  86                      const char *initrd_filename, const char *cpu_model)
  87 {
  88     if (!cpu_model) {
  89         cpu_model = "sample-xtensa-core";
  90     }
  91     xtensa_init(ram_size, boot_device, kernel_filename, kernel_cmdline,
  92                   initrd_filename, cpu_model);
  93 }
  94
  95 static QEMUMachine xtensa_sample_machine = {
  96     .name = "sample-xtensa-machine",
  97     .desc = "Sample Xtensa machine (sample Xtensa core)",
  98     .init = xtensa_sample_init,
  99     .max_cpus = 4,
 100 };
 101
 102 static void xtensa_sample_machine_init(void)
 103 {
 104     qemu_register_machine(&xtensa_sample_machine);
 105 }
 106
 107 machine_init(xtensa_sample_machine_init);