1 /*

     2  * Syborg snapshot device

     3  *

     4  * Copyright (c) 2008 CodeSourcery

     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.h"

    26 #include "qemu-char.h"

    27 #include "syborg.h"

    28 #include "devtree.h"

    29 #include "sysemu.h"

    30 

    31 //#define DEBUG_SYBORG_SNAPSHOT

    32 

    33 #ifdef DEBUG_SYBORG_SNAPSHOT

    34 #define DPRINTF(fmt, args...) \

    35 do { printf("syborg_snapshot: " fmt , ##args); } while (0)

    36 #define BADF(fmt, args...) \

    37 do { fprintf(stderr, "syborg_snapshot: error: " fmt , ##args); exit(1);} while (0)

    38 #else

    39 #define DPRINTF(fmt, args...) do {} while(0)

    40 #define BADF(fmt, args...) \

    41 do { fprintf(stderr, "syborg_snapshot: error: " fmt , ##args);} while (0)

    42 #endif

    43 

    44 enum {

    45     SNAPSHOT_ID           = 0,

    46     SNAPSHOT_ADDRESS      = 1,

    47     SNAPSHOT_LENGTH       = 2,

    48     SNAPSHOT_TRIGGER      = 3

    49 };

    50 

    51 typedef struct {

    52     QEMUDevice *qdev;

    53     uint32_t address;

    54     uint32_t length;

    55 } syborg_snapshot_state;

    56 

    57 static void syborg_snapshot_trigger(syborg_snapshot_state *s, uint32_t value)

    58 {

    59     char *buf;

    60 

    61     buf = qemu_malloc(s->length + 1);

    62     if (!buf)

    63         return;

    64     cpu_physical_memory_read(s->address, (void *)buf, s->length);

    65     buf[s->length] = 0;

    66     switch (value) {

    67     case 1:

    68         DPRINTF("Snapshotting to %s\n", buf);

    69         qemu_snapshot_request(buf);

    70         break;

    71     case 2:

    72         DPRINTF("Restoring from %s\n", buf);

    73         qemu_snapshot_request_restore(buf);

    74         break;

    75     default:

    76         break;

    77     }

    78     qemu_free(buf);

    79 }

    80 

    81 static uint32_t syborg_snapshot_read(void *opaque, target_phys_addr_t offset)

    82 {

    83     syborg_snapshot_state *s = (syborg_snapshot_state *)opaque;

    84     

    85     offset &= 0xfff;

    86     DPRINTF("read 0x%x\n", (int)offset);

    87     switch(offset >>2) {

    88     case SNAPSHOT_ID:

    89         return SYBORG_ID_SNAPSHOT;

    90     case SNAPSHOT_ADDRESS:

    91         return s->address;

    92     case SNAPSHOT_LENGTH:

    93         return s->length;

    94     default:

    95         BADF("Bad read offset %x\n", (int)offset);

    96         return 0;  

    97     }

    98 }

    99 

   100 static void syborg_snapshot_write(void *opaque, target_phys_addr_t offset,

   101                                   uint32_t value)

   102 {

   103     syborg_snapshot_state *s = (syborg_snapshot_state *)opaque;

   104     

   105     offset &= 0xfff;

   106     DPRINTF("Write 0x%x=0x%x\n", (int)offset, value);

   107     switch (offset >> 2) {

   108     case SNAPSHOT_ADDRESS:

   109         s->address = value;

   110         break;

   111     case SNAPSHOT_LENGTH:

   112         s->length = value;

   113         break;

   114     case SNAPSHOT_TRIGGER:

   115         syborg_snapshot_trigger(s, value);

   116         break;

   117     default:

   118         BADF("Bad write offset %x\n", (int)offset);

   119         break;

   120     }

   121 }

   122 

   123 static CPUReadMemoryFunc *syborg_snapshot_readfn[] = {

   124      syborg_snapshot_read,

   125      syborg_snapshot_read,

   126      syborg_snapshot_read

   127 };

   128 

   129 static CPUWriteMemoryFunc *syborg_snapshot_writefn[] = {

   130      syborg_snapshot_write,

   131      syborg_snapshot_write,

   132      syborg_snapshot_write

   133 };

   134 

   135 static void syborg_snapshot_save(QEMUFile *f, void *opaque)

   136 {

   137     syborg_snapshot_state *s = opaque;

   138 

   139     qemu_put_be32(f, s->address);

   140     qemu_put_be32(f, s->length);

   141 }

   142 

   143 static int syborg_snapshot_load(QEMUFile *f, void *opaque, int version_id)

   144 {

   145     syborg_snapshot_state *s = opaque;

   146 

   147     if (version_id != 1)

   148         return -EINVAL;

   149 

   150     s->address = qemu_get_be32(f);

   151     s->length = qemu_get_be32(f);

   152 

   153     return 0;

   154 }

   155 

   156 static void syborg_snapshot_create(QEMUDevice *dev)

   157 {

   158     syborg_snapshot_state *s;

   159     s = (syborg_snapshot_state *)qemu_mallocz(sizeof(syborg_snapshot_state));

   160     s->qdev = dev;

   161     qdev_set_opaque(dev, s);

   162 }

   163 

   164 void syborg_snapshot_register(void)

   165 {

   166     QEMUDeviceClass *dc;

   167     dc = qdev_new("syborg,snapshot", syborg_snapshot_create, 0);

   168     qdev_add_registers(dc, syborg_snapshot_readfn, syborg_snapshot_writefn,

   169                        0x1000);

   170     qdev_add_savevm(dc, 1, syborg_snapshot_save, syborg_snapshot_load);

   171 }