qemu

generic-loader.c (7213B)

---

 /*
  * Generic Loader
  *
  * Copyright (C) 2014 Li Guang
  * Copyright (C) 2016 Xilinx Inc.
  * Written by Li Guang <lig.fnst@cn.fujitsu.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  * for more details.
  *
  */
 
 /*
  * Internally inside QEMU this is a device. It is a strange device that
  * provides no hardware interface but allows QEMU to monkey patch memory
  * specified when it is created. To be able to do this it has a reset
  * callback that does the memory operations.
 
  * This device allows the user to monkey patch memory. To be able to do
  * this it needs a backend to manage the datas, the same as other
  * memory-related devices. In this case as the backend is so trivial we
  * have merged it with the frontend instead of creating and maintaining a
  * separate backend.
  */
 
 #include "qemu/osdep.h"
 #include "hw/core/cpu.h"
 #include "sysemu/dma.h"
 #include "sysemu/reset.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
 #include "hw/qdev-properties.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
 #include "hw/core/generic-loader.h"
 
 #define CPU_NONE 0xFFFFFFFF
 
 static void generic_loader_reset(void *opaque)
 {
     GenericLoaderState *s = GENERIC_LOADER(opaque);
 
     if (s->set_pc) {
         CPUClass *cc = CPU_GET_CLASS(s->cpu);
         cpu_reset(s->cpu);
         if (cc) {
             cc->set_pc(s->cpu, s->addr);
         }
     }
 
     if (s->data_len) {
         assert(s->data_len <= sizeof(s->data));
         dma_memory_write(s->cpu->as, s->addr, &s->data, s->data_len,
                          MEMTXATTRS_UNSPECIFIED);
     }
 }
 
 static void generic_loader_realize(DeviceState *dev, Error **errp)
 {
     GenericLoaderState *s = GENERIC_LOADER(dev);
     hwaddr entry;
     int big_endian;
     ssize_t size = 0;
 
     s->set_pc = false;
 
     /* Perform some error checking on the user's options */
     if (s->data || s->data_len  || s->data_be) {
         /* User is loading memory values */
         if (s->file) {
             error_setg(errp, "Specifying a file is not supported when loading "
                        "memory values");
             return;
         } else if (s->force_raw) {
             error_setg(errp, "Specifying force-raw is not supported when "
                        "loading memory values");
             return;
         } else if (!s->data_len) {
             /* We can't check for !data here as a value of 0 is still valid. */
             error_setg(errp, "Both data and data-len must be specified");
             return;
         } else if (s->data_len > 8) {
             error_setg(errp, "data-len cannot be greater then 8 bytes");
             return;
         }
     } else if (s->file || s->force_raw)  {
         /* User is loading an image */
         if (s->data || s->data_len || s->data_be) {
             error_setg(errp, "data can not be specified when loading an "
                        "image");
             return;
         }
         /* The user specified a file, only set the PC if they also specified
          * a CPU to use.
          */
         if (s->cpu_num != CPU_NONE) {
             s->set_pc = true;
         }
     } else if (s->addr) {
         /* User is setting the PC */
         if (s->data || s->data_len || s->data_be) {
             error_setg(errp, "data can not be specified when setting a "
                        "program counter");
             return;
         } else if (s->cpu_num == CPU_NONE) {
             error_setg(errp, "cpu_num must be specified when setting a "
                        "program counter");
             return;
         }
         s->set_pc = true;
     } else {
         /* Did the user specify anything? */
         error_setg(errp, "please include valid arguments");
         return;
     }
 
     qemu_register_reset(generic_loader_reset, dev);
 
     if (s->cpu_num != CPU_NONE) {
         s->cpu = qemu_get_cpu(s->cpu_num);
         if (!s->cpu) {
             error_setg(errp, "Specified boot CPU#%d is nonexistent",
                        s->cpu_num);
             return;
         }
     } else {
         s->cpu = first_cpu;
     }
 
     big_endian = target_words_bigendian();
 
     if (s->file) {
         AddressSpace *as = s->cpu ? s->cpu->as :  NULL;
 
         if (!s->force_raw) {
             size = load_elf_as(s->file, NULL, NULL, NULL, &entry, NULL, NULL,
                                NULL, big_endian, 0, 0, 0, as);
 
             if (size < 0) {
                 size = load_uimage_as(s->file, &entry, NULL, NULL, NULL, NULL,
                                       as);
             }
 
             if (size < 0) {
                 size = load_targphys_hex_as(s->file, &entry, as);
             }
         }
 
         if (size < 0 || s->force_raw) {
             /* Default to the maximum size being the machine's ram size */
             size = load_image_targphys_as(s->file, s->addr, current_machine->ram_size, as);
         } else {
             s->addr = entry;
         }
 
         if (size < 0) {
             error_setg(errp, "Cannot load specified image %s", s->file);
             return;
         }
     }
 
     /* Convert the data endiannes */
     if (s->data_be) {
         s->data = cpu_to_be64(s->data);
     } else {
         s->data = cpu_to_le64(s->data);
     }
 }
 
 static void generic_loader_unrealize(DeviceState *dev)
 {
     qemu_unregister_reset(generic_loader_reset, dev);
 }
 
 static Property generic_loader_props[] = {
     DEFINE_PROP_UINT64("addr", GenericLoaderState, addr, 0),
     DEFINE_PROP_UINT64("data", GenericLoaderState, data, 0),
     DEFINE_PROP_UINT8("data-len", GenericLoaderState, data_len, 0),
     DEFINE_PROP_BOOL("data-be", GenericLoaderState, data_be, false),
     DEFINE_PROP_UINT32("cpu-num", GenericLoaderState, cpu_num, CPU_NONE),
     DEFINE_PROP_BOOL("force-raw", GenericLoaderState, force_raw, false),
     DEFINE_PROP_STRING("file", GenericLoaderState, file),
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static void generic_loader_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     /* The reset function is not registered here and is instead registered in
      * the realize function to allow this device to be added via the device_add
      * command in the QEMU monitor.
      * TODO: Improve the device_add functionality to allow resets to be
      * connected
      */
     dc->realize = generic_loader_realize;
     dc->unrealize = generic_loader_unrealize;
     device_class_set_props(dc, generic_loader_props);
     dc->desc = "Generic Loader";
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
 
 static const TypeInfo generic_loader_info = {
     .name = TYPE_GENERIC_LOADER,
     .parent = TYPE_DEVICE,
     .instance_size = sizeof(GenericLoaderState),
     .class_init = generic_loader_class_init,
 };
 
 static void generic_loader_register_type(void)
 {
     type_register_static(&generic_loader_info);
 }
 
 type_init(generic_loader_register_type)