hw/cris/boot.c

   1 /*
   2  * CRIS image loading.
   3  *
   4  * Copyright (c) 2010 Edgar E. Iglesias, Axis Communications AB.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "cpu.h"
  27 #include "hw/loader.h"
  28 #include "elf.h"
  29 #include "boot.h"
  30 #include "qemu/cutils.h"
  31 #include "sysemu/reset.h"
  32
  33 static void main_cpu_reset(void *opaque)
  34 {
  35     CRISCPU *cpu = opaque;
  36     CPUCRISState *env = &cpu->env;
  37     struct cris_load_info *li;
  38
  39     li = env->load_info;
  40
  41     cpu_reset(CPU(cpu));
  42
  43     if (!li) {
  44         /* nothing more to do.  */
  45         return;
  46     }
  47
  48     env->pc = li->entry;
  49
  50     if (li->image_filename) {
  51         env->regs[8] = 0x56902387; /* RAM boot magic.  */
  52         env->regs[9] = 0x40004000 + li->image_size;
  53     }
  54
  55     if (li->cmdline) {
  56         /* Let the kernel know we are modifying the cmdline.  */
  57         env->regs[10] = 0x87109563;
  58         env->regs[11] = 0x40000000;
  59     }
  60 }
  61
  62 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
  63 {
  64     return addr - 0x80000000LL;
  65 }
  66
  67 void cris_load_image(CRISCPU *cpu, struct cris_load_info *li)
  68 {
  69     CPUCRISState *env = &cpu->env;
  70     uint64_t entry;
  71     int kcmdline_len;
  72     int image_size;
  73
  74     env->load_info = li;
  75     /* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis
  76        devboard SDK.  */
  77     image_size = load_elf(li->image_filename, NULL,
  78                           translate_kernel_address, NULL,
  79                           &entry, NULL, NULL, NULL, 0, EM_CRIS, 0, 0);
  80     li->entry = entry;
  81     if (image_size < 0) {
  82         /* Takes a kimage from the axis devboard SDK.  */
  83         image_size = load_image_targphys(li->image_filename, 0x40004000,
  84                                          li->ram_size);
  85         li->entry = 0x40004000;
  86     }
  87
  88     if (image_size < 0) {
  89         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  90                 li->image_filename);
  91         exit(1);
  92     }
  93
  94     if (li->cmdline && (kcmdline_len = strlen(li->cmdline))) {
  95         if (kcmdline_len > 256) {
  96             fprintf(stderr, "Too long CRIS kernel cmdline (max 256)\n");
  97             exit(1);
  98         }
  99         pstrcpy_targphys("cmdline", 0x40000000, 256, li->cmdline);
 100     }
 101     qemu_register_reset(main_cpu_reset, cpu);
 102 }