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 "hw/hw.h"
  26 #include "hw/loader.h"
  27 #include "elf.h"
  28 #include "hw/cris-boot.h"
  29
  30 static void main_cpu_reset(void *opaque)
  31 {
  32     CRISCPU *cpu = opaque;
  33     CPUCRISState *env = &cpu->env;
  34     struct cris_load_info *li;
  35
  36     li = env->load_info;
  37
  38     cpu_reset(CPU(cpu));
  39
  40     if (!li) {
  41         /* nothing more to do.  */
  42         return;
  43     }
  44
  45     env->pc = li->entry;
  46
  47     if (li->image_filename) {
  48         env->regs[8] = 0x56902387; /* RAM boot magic.  */
  49         env->regs[9] = 0x40004000 + li->image_size;
  50     }
  51
  52     if (li->cmdline) {
  53         /* Let the kernel know we are modifying the cmdline.  */
  54         env->regs[10] = 0x87109563;
  55         env->regs[11] = 0x40000000;
  56     }
  57 }
  58
  59 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
  60 {
  61     return addr - 0x80000000LL;
  62 }
  63
  64 void cris_load_image(CRISCPU *cpu, struct cris_load_info *li)
  65 {
  66     CPUCRISState *env = &cpu->env;
  67     uint64_t entry, high;
  68     int kcmdline_len;
  69     int image_size;
  70
  71     env->load_info = li;
  72     /* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis
  73        devboard SDK.  */
  74     image_size = load_elf(li->image_filename, translate_kernel_address, NULL,
  75                           &entry, NULL, &high, 0, ELF_MACHINE, 0);
  76     li->entry = entry;
  77     if (image_size < 0) {
  78         /* Takes a kimage from the axis devboard SDK.  */
  79         image_size = load_image_targphys(li->image_filename, 0x40004000,
  80                                          ram_size);
  81         li->entry = 0x40004000;
  82     }
  83
  84     if (image_size < 0) {
  85         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  86                 li->image_filename);
  87         exit(1);
  88     }
  89
  90     if (li->cmdline && (kcmdline_len = strlen(li->cmdline))) {
  91         if (kcmdline_len > 256) {
  92             fprintf(stderr, "Too long CRIS kernel cmdline (max 256)\n");
  93             exit(1);
  94         }
  95         pstrcpy_targphys("cmdline", 0x40000000, 256, li->cmdline);
  96     }
  97     qemu_register_reset(main_cpu_reset, cpu);
  98 }