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 "qom/cpu.h"
  35 #include "hw/sysbus.h"
  36 #include "sysemu/dma.h"
  37 #include "hw/loader.h"
  38 #include "qapi/error.h"
  39 #include "hw/core/generic-loader.h"
  40
  41 #define CPU_NONE 0xFFFFFFFF
  42
  43 static void generic_loader_reset(void *opaque)
  44 {
  45     GenericLoaderState *s = GENERIC_LOADER(opaque);
  46
  47     if (s->set_pc) {
  48         CPUClass *cc = CPU_GET_CLASS(s->cpu);
  49         cpu_reset(s->cpu);
  50         if (cc) {
  51             cc->set_pc(s->cpu, s->addr);
  52         }
  53     }
  54
  55     if (s->data_len) {
  56         assert(s->data_len < sizeof(s->data));
  57         dma_memory_write(s->cpu->as, s->addr, &s->data, s->data_len);
  58     }
  59 }
  60
  61 static void generic_loader_realize(DeviceState *dev, Error **errp)
  62 {
  63     GenericLoaderState *s = GENERIC_LOADER(dev);
  64     hwaddr entry;
  65     int big_endian;
  66     int size = 0;
  67
  68     s->set_pc = false;
  69
  70     /* Perform some error checking on the user's options */
  71     if (s->data || s->data_len  || s->data_be) {
  72         /* User is loading memory values */
  73         if (s->file) {
  74             error_setg(errp, "Specifying a file is not supported when loading "
  75                        "memory values");
  76             return;
  77         } else if (s->force_raw) {
  78             error_setg(errp, "Specifying force-raw is not supported when "
  79                        "loading memory values");
  80             return;
  81         } else if (!s->data_len) {
  82             /* We can't check for !data here as a value of 0 is still valid. */
  83             error_setg(errp, "Both data and data-len must be specified");
  84             return;
  85         } else if (s->data_len > 8) {
  86             error_setg(errp, "data-len cannot be greater then 8 bytes");
  87             return;
  88         }
  89     } else if (s->file || s->force_raw)  {
  90         /* User is loading an image */
  91         if (s->data || s->data_len || s->data_be) {
  92             error_setg(errp, "data can not be specified when loading an "
  93                        "image");
  94             return;
  95         }
  96         /* The user specified a file, only set the PC if they also specified
  97          * a CPU to use.
  98          */
  99         if (s->cpu_num != CPU_NONE) {
 100             s->set_pc = true;
 101         }
 102     } else if (s->addr) {
 103         /* User is setting the PC */
 104         if (s->data || s->data_len || s->data_be) {
 105             error_setg(errp, "data can not be specified when setting a "
 106                        "program counter");
 107             return;
 108         } else if (!s->cpu_num) {
 109             error_setg(errp, "cpu_num must be specified when setting a "
 110                        "program counter");
 111             return;
 112         }
 113         s->set_pc = true;
 114     } else {
 115         /* Did the user specify anything? */
 116         error_setg(errp, "please include valid arguments");
 117         return;
 118     }
 119
 120     qemu_register_reset(generic_loader_reset, dev);
 121
 122     if (s->cpu_num != CPU_NONE) {
 123         s->cpu = qemu_get_cpu(s->cpu_num);
 124         if (!s->cpu) {
 125             error_setg(errp, "Specified boot CPU#%d is nonexistent",
 126                        s->cpu_num);
 127             return;
 128         }
 129     } else {
 130         s->cpu = first_cpu;
 131     }
 132
 133 #ifdef TARGET_WORDS_BIGENDIAN
 134     big_endian = 1;
 135 #else
 136     big_endian = 0;
 137 #endif
 138
 139     if (s->file) {
 140         if (!s->force_raw) {
 141             size = load_elf_as(s->file, NULL, NULL, &entry, NULL, NULL,
 142                                big_endian, 0, 0, 0, s->cpu->as);
 143
 144             if (size < 0) {
 145                 size = load_uimage_as(s->file, &entry, NULL, NULL, NULL, NULL,
 146                                       s->cpu->as);
 147             }
 148         }
 149
 150         if (size < 0 || s->force_raw) {
 151             /* Default to the maximum size being the machine's ram size */
 152             size = load_image_targphys_as(s->file, s->addr, ram_size,
 153                                           s->cpu->as);
 154         } else {
 155             s->addr = entry;
 156         }
 157
 158         if (size < 0) {
 159             error_setg(errp, "Cannot load specified image %s", s->file);
 160             return;
 161         }
 162     }
 163
 164     /* Convert the data endiannes */
 165     if (s->data_be) {
 166         s->data = cpu_to_be64(s->data);
 167     } else {
 168         s->data = cpu_to_le64(s->data);
 169     }
 170 }
 171
 172 static void generic_loader_unrealize(DeviceState *dev, Error **errp)
 173 {
 174     qemu_unregister_reset(generic_loader_reset, dev);
 175 }
 176
 177 static Property generic_loader_props[] = {
 178     DEFINE_PROP_UINT64("addr", GenericLoaderState, addr, 0),
 179     DEFINE_PROP_UINT64("data", GenericLoaderState, data, 0),
 180     DEFINE_PROP_UINT8("data-len", GenericLoaderState, data_len, 0),
 181     DEFINE_PROP_BOOL("data-be", GenericLoaderState, data_be, false),
 182     DEFINE_PROP_UINT32("cpu-num", GenericLoaderState, cpu_num, CPU_NONE),
 183     DEFINE_PROP_BOOL("force-raw", GenericLoaderState, force_raw, false),
 184     DEFINE_PROP_STRING("file", GenericLoaderState, file),
 185     DEFINE_PROP_END_OF_LIST(),
 186 };
 187
 188 static void generic_loader_class_init(ObjectClass *klass, void *data)
 189 {
 190     DeviceClass *dc = DEVICE_CLASS(klass);
 191
 192     /* The reset function is not registered here and is instead registered in
 193      * the realize function to allow this device to be added via the device_add
 194      * command in the QEMU monitor.
 195      * TODO: Improve the device_add functionality to allow resets to be
 196      * connected
 197      */
 198     dc->realize = generic_loader_realize;
 199     dc->unrealize = generic_loader_unrealize;
 200     dc->props = generic_loader_props;
 201     dc->desc = "Generic Loader";
 202 }
 203
 204 static TypeInfo generic_loader_info = {
 205     .name = TYPE_GENERIC_LOADER,
 206     .parent = TYPE_DEVICE,
 207     .instance_size = sizeof(GenericLoaderState),
 208     .class_init = generic_loader_class_init,
 209 };
 210
 211 static void generic_loader_register_type(void)
 212 {
 213     type_register_static(&generic_loader_info);
 214 }
 215
 216 type_init(generic_loader_register_type)