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 "sysemu/dma.h"
  36 #include "sysemu/reset.h"
  37 #include "hw/boards.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                          MEMTXATTRS_UNSPECIFIED);
  62     }
  63 }
  64
  65 static void generic_loader_realize(DeviceState *dev, Error **errp)
  66 {
  67     GenericLoaderState *s = GENERIC_LOADER(dev);
  68     hwaddr entry;
  69     int big_endian;
  70     ssize_t size = 0;
  71
  72     s->set_pc = false;
  73
  74     /* Perform some error checking on the user's options */
  75     if (s->data || s->data_len  || s->data_be) {
  76         /* User is loading memory values */
  77         if (s->file) {
  78             error_setg(errp, "Specifying a file is not supported when loading "
  79                        "memory values");
  80             return;
  81         } else if (s->force_raw) {
  82             error_setg(errp, "Specifying force-raw is not supported when "
  83                        "loading memory values");
  84             return;
  85         } else if (!s->data_len) {
  86             /* We can't check for !data here as a value of 0 is still valid. */
  87             error_setg(errp, "Both data and data-len must be specified");
  88             return;
  89         } else if (s->data_len > 8) {
  90             error_setg(errp, "data-len cannot be greater then 8 bytes");
  91             return;
  92         }
  93     } else if (s->file || s->force_raw)  {
  94         /* User is loading an image */
  95         if (s->data || s->data_len || s->data_be) {
  96             error_setg(errp, "data can not be specified when loading an "
  97                        "image");
  98             return;
  99         }
 100         /* The user specified a file, only set the PC if they also specified
 101          * a CPU to use.
 102          */
 103         if (s->cpu_num != CPU_NONE) {
 104             s->set_pc = true;
 105         }
 106     } else if (s->addr) {
 107         /* User is setting the PC */
 108         if (s->data || s->data_len || s->data_be) {
 109             error_setg(errp, "data can not be specified when setting a "
 110                        "program counter");
 111             return;
 112         } else if (s->cpu_num == CPU_NONE) {
 113             error_setg(errp, "cpu_num must be specified when setting a "
 114                        "program counter");
 115             return;
 116         }
 117         s->set_pc = true;
 118     } else {
 119         /* Did the user specify anything? */
 120         error_setg(errp, "please include valid arguments");
 121         return;
 122     }
 123
 124     qemu_register_reset(generic_loader_reset, dev);
 125
 126     if (s->cpu_num != CPU_NONE) {
 127         s->cpu = qemu_get_cpu(s->cpu_num);
 128         if (!s->cpu) {
 129             error_setg(errp, "Specified boot CPU#%d is nonexistent",
 130                        s->cpu_num);
 131             return;
 132         }
 133     } else {
 134         s->cpu = first_cpu;
 135     }
 136
 137     big_endian = target_words_bigendian();
 138
 139     if (s->file) {
 140         AddressSpace *as = s->cpu ? s->cpu->as :  NULL;
 141
 142         if (!s->force_raw) {
 143             size = load_elf_as(s->file, NULL, NULL, NULL, &entry, NULL, NULL,
 144                                NULL, big_endian, 0, 0, 0, as);
 145
 146             if (size < 0) {
 147                 size = load_uimage_as(s->file, &entry, NULL, NULL, NULL, NULL,
 148                                       as);
 149             }
 150
 151             if (size < 0) {
 152                 size = load_targphys_hex_as(s->file, &entry, as);
 153             }
 154         }
 155
 156         if (size < 0 || s->force_raw) {
 157             /* Default to the maximum size being the machine's ram size */
 158             size = load_image_targphys_as(s->file, s->addr, current_machine->ram_size, as);
 159         } else {
 160             s->addr = entry;
 161         }
 162
 163         if (size < 0) {
 164             error_setg(errp, "Cannot load specified image %s", s->file);
 165             return;
 166         }
 167     }
 168
 169     /* Convert the data endiannes */
 170     if (s->data_be) {
 171         s->data = cpu_to_be64(s->data);
 172     } else {
 173         s->data = cpu_to_le64(s->data);
 174     }
 175 }
 176
 177 static void generic_loader_unrealize(DeviceState *dev)
 178 {
 179     qemu_unregister_reset(generic_loader_reset, dev);
 180 }
 181
 182 static Property generic_loader_props[] = {
 183     DEFINE_PROP_UINT64("addr", GenericLoaderState, addr, 0),
 184     DEFINE_PROP_UINT64("data", GenericLoaderState, data, 0),
 185     DEFINE_PROP_UINT8("data-len", GenericLoaderState, data_len, 0),
 186     DEFINE_PROP_BOOL("data-be", GenericLoaderState, data_be, false),
 187     DEFINE_PROP_UINT32("cpu-num", GenericLoaderState, cpu_num, CPU_NONE),
 188     DEFINE_PROP_BOOL("force-raw", GenericLoaderState, force_raw, false),
 189     DEFINE_PROP_STRING("file", GenericLoaderState, file),
 190     DEFINE_PROP_END_OF_LIST(),
 191 };
 192
 193 static void generic_loader_class_init(ObjectClass *klass, void *data)
 194 {
 195     DeviceClass *dc = DEVICE_CLASS(klass);
 196
 197     /* The reset function is not registered here and is instead registered in
 198      * the realize function to allow this device to be added via the device_add
 199      * command in the QEMU monitor.
 200      * TODO: Improve the device_add functionality to allow resets to be
 201      * connected
 202      */
 203     dc->realize = generic_loader_realize;
 204     dc->unrealize = generic_loader_unrealize;
 205     device_class_set_props(dc, generic_loader_props);
 206     dc->desc = "Generic Loader";
 207     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 208 }
 209
 210 static const TypeInfo generic_loader_info = {
 211     .name = TYPE_GENERIC_LOADER,
 212     .parent = TYPE_DEVICE,
 213     .instance_size = sizeof(GenericLoaderState),
 214     .class_init = generic_loader_class_init,
 215 };
 216
 217 static void generic_loader_register_type(void)
 218 {
 219     type_register_static(&generic_loader_info);
 220 }
 221
 222 type_init(generic_loader_register_type)