hw/core/generic-loader.c

   1 /*
   2  * Generic Loader
   3  *
   4  * Copyright (C) 2014 Li Guang
   5  * Copyright (C) 2016 Xilinx Inc.
   6  * Written by Li Guang <lig.fnst@cn.fujitsu.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  16  * for more details.
  17  *
  18  */
  19
  20 /*
  21  * Internally inside QEMU this is a device. It is a strange device that
  22  * provides no hardware interface but allows QEMU to monkey patch memory
  23  * specified when it is created. To be able to do this it has a reset
  24  * callback that does the memory operations.
  25
  26  * This device allows the user to monkey patch memory. To be able to do
  27  * this it needs a backend to manage the datas, the same as other
  28  * memory-related devices. In this case as the backend is so trivial we
  29  * have merged it with the frontend instead of creating and maintaining a
  30  * separate backend.
  31  */
  32
  33 #include "qemu/osdep.h"
  34 #include "hw/core/cpu.h"
  35 #include "hw/sysbus.h"
  36 #include "sysemu/dma.h"
  37 #include "sysemu/reset.h"
  38 #include "hw/loader.h"
  39 #include "hw/qdev-properties.h"
  40 #include "qapi/error.h"
  41 #include "qemu/module.h"
  42 #include "hw/core/generic-loader.h"
  43
  44 #define CPU_NONE 0xFFFFFFFF
  45
  46 static void generic_loader_reset(void *opaque)
  47 {
  48     GenericLoaderState *s = GENERIC_LOADER(opaque);
  49
  50     if (s->set_pc) {
  51         CPUClass *cc = CPU_GET_CLASS(s->cpu);
  52         cpu_reset(s->cpu);
  53         if (cc) {
  54             cc->set_pc(s->cpu, s->addr);
  55         }
  56     }
  57
  58     if (s->data_len) {
  59         assert(s->data_len < sizeof(s->data));
  60         dma_memory_write(s->cpu->as, s->addr, &s->data, s->data_len);
  61     }
  62 }
  63
  64 static void generic_loader_realize(DeviceState *dev, Error **errp)
  65 {
  66     GenericLoaderState *s = GENERIC_LOADER(dev);
  67     hwaddr entry;
  68     int big_endian;
  69     int size = 0;
  70
  71     s->set_pc = false;
  72
  73     /* Perform some error checking on the user's options */
  74     if (s->data || s->data_len  || s->data_be) {
  75         /* User is loading memory values */
  76         if (s->file) {
  77             error_setg(errp, "Specifying a file is not supported when loading "
  78                        "memory values");
  79             return;
  80         } else if (s->force_raw) {
  81             error_setg(errp, "Specifying force-raw is not supported when "
  82                        "loading memory values");
  83             return;
  84         } else if (!s->data_len) {
  85             /* We can't check for !data here as a value of 0 is still valid. */
  86             error_setg(errp, "Both data and data-len must be specified");
  87             return;
  88         } else if (s->data_len > 8) {
  89             error_setg(errp, "data-len cannot be greater then 8 bytes");
  90             return;
  91         }
  92     } else if (s->file || s->force_raw)  {
  93         /* User is loading an image */
  94         if (s->data || s->data_len || s->data_be) {
  95             error_setg(errp, "data can not be specified when loading an "
  96                        "image");
  97             return;
  98         }
  99         /* The user specified a file, only set the PC if they also specified
 100          * a CPU to use.
 101          */
 102         if (s->cpu_num != CPU_NONE) {
 103             s->set_pc = true;
 104         }
 105     } else if (s->addr) {
 106         /* User is setting the PC */
 107         if (s->data || s->data_len || s->data_be) {
 108             error_setg(errp, "data can not be specified when setting a "
 109                        "program counter");
 110             return;
 111         } else if (s->cpu_num == CPU_NONE) {
 112             error_setg(errp, "cpu_num must be specified when setting a "
 113                        "program counter");
 114             return;
 115         }
 116         s->set_pc = true;
 117     } else {
 118         /* Did the user specify anything? */
 119         error_setg(errp, "please include valid arguments");
 120         return;
 121     }
 122
 123     qemu_register_reset(generic_loader_reset, dev);
 124
 125     if (s->cpu_num != CPU_NONE) {
 126         s->cpu = qemu_get_cpu(s->cpu_num);
 127         if (!s->cpu) {
 128             error_setg(errp, "Specified boot CPU#%d is nonexistent",
 129                        s->cpu_num);
 130             return;
 131         }
 132     } else {
 133         s->cpu = first_cpu;
 134     }
 135
 136     big_endian = target_words_bigendian();
 137
 138     if (s->file) {
 139         AddressSpace *as = s->cpu ? s->cpu->as :  NULL;
 140
 141         if (!s->force_raw) {
 142             size = load_elf_as(s->file, NULL, NULL, NULL, &entry, NULL, NULL,
 143                                NULL, big_endian, 0, 0, 0, as);
 144
 145             if (size < 0) {
 146                 size = load_uimage_as(s->file, &entry, NULL, NULL, NULL, NULL,
 147                                       as);
 148             }
 149
 150             if (size < 0) {
 151                 size = load_targphys_hex_as(s->file, &entry, as);
 152             }
 153         }
 154
 155         if (size < 0 || s->force_raw) {
 156             /* Default to the maximum size being the machine's ram size */
 157             size = load_image_targphys_as(s->file, s->addr, ram_size, as);
 158         } else {
 159             s->addr = entry;
 160         }
 161
 162         if (size < 0) {
 163             error_setg(errp, "Cannot load specified image %s", s->file);
 164             return;
 165         }
 166     }
 167
 168     /* Convert the data endiannes */
 169     if (s->data_be) {
 170         s->data = cpu_to_be64(s->data);
 171     } else {
 172         s->data = cpu_to_le64(s->data);
 173     }
 174 }
 175
 176 static void generic_loader_unrealize(DeviceState *dev)
 177 {
 178     qemu_unregister_reset(generic_loader_reset, dev);
 179 }
 180
 181 static Property generic_loader_props[] = {
 182     DEFINE_PROP_UINT64("addr", GenericLoaderState, addr, 0),
 183     DEFINE_PROP_UINT64("data", GenericLoaderState, data, 0),
 184     DEFINE_PROP_UINT8("data-len", GenericLoaderState, data_len, 0),
 185     DEFINE_PROP_BOOL("data-be", GenericLoaderState, data_be, false),
 186     DEFINE_PROP_UINT32("cpu-num", GenericLoaderState, cpu_num, CPU_NONE),
 187     DEFINE_PROP_BOOL("force-raw", GenericLoaderState, force_raw, false),
 188     DEFINE_PROP_STRING("file", GenericLoaderState, file),
 189     DEFINE_PROP_END_OF_LIST(),
 190 };
 191
 192 static void generic_loader_class_init(ObjectClass *klass, void *data)
 193 {
 194     DeviceClass *dc = DEVICE_CLASS(klass);
 195
 196     /* The reset function is not registered here and is instead registered in
 197      * the realize function to allow this device to be added via the device_add
 198      * command in the QEMU monitor.
 199      * TODO: Improve the device_add functionality to allow resets to be
 200      * connected
 201      */
 202     dc->realize = generic_loader_realize;
 203     dc->unrealize = generic_loader_unrealize;
 204     device_class_set_props(dc, generic_loader_props);
 205     dc->desc = "Generic Loader";
 206     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 207 }
 208
 209 static TypeInfo generic_loader_info = {
 210     .name = TYPE_GENERIC_LOADER,
 211     .parent = TYPE_DEVICE,
 212     .instance_size = sizeof(GenericLoaderState),
 213     .class_init = generic_loader_class_init,
 214 };
 215
 216 static void generic_loader_register_type(void)
 217 {
 218     type_register_static(&generic_loader_info);
 219 }
 220
 221 type_init(generic_loader_register_type)