qemu

FORK: QEMU emulator
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testdev.c (3658B)

      1 /*
      2  * QEMU Char Device for testsuite control
      3  *
      4  * Copyright (c) 2014 Red Hat, Inc.
      5  *
      6  * Author: Paolo Bonzini <pbonzini@redhat.com>
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining a copy
      9  * of this software and associated documentation files (the "Software"), to deal
     10  * in the Software without restriction, including without limitation the rights
     11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     12  * copies of the Software, and to permit persons to whom the Software is
     13  * furnished to do so, subject to the following conditions:
     14  *
     15  * The above copyright notice and this permission notice shall be included in
     16  * all copies or substantial portions of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     24  * THE SOFTWARE.
     25  */
     26 
     27 #include "qemu/osdep.h"
     28 #include "qemu/module.h"
     29 #include "chardev/char.h"
     30 #include "qom/object.h"
     31 
     32 #define BUF_SIZE 32
     33 
     34 struct TestdevChardev {
     35     Chardev parent;
     36 
     37     uint8_t in_buf[32];
     38     int in_buf_used;
     39 };
     40 typedef struct TestdevChardev TestdevChardev;
     41 
     42 #define TYPE_CHARDEV_TESTDEV "chardev-testdev"
     43 DECLARE_INSTANCE_CHECKER(TestdevChardev, TESTDEV_CHARDEV,
     44                          TYPE_CHARDEV_TESTDEV)
     45 
     46 /* Try to interpret a whole incoming packet */
     47 static int testdev_eat_packet(TestdevChardev *testdev)
     48 {
     49     const uint8_t *cur = testdev->in_buf;
     50     int len = testdev->in_buf_used;
     51     uint8_t c;
     52     int arg;
     53 
     54 #define EAT(c) do { \
     55     if (!len--) {   \
     56         return 0;   \
     57     }               \
     58     c = *cur++;     \
     59 } while (0)
     60 
     61     EAT(c);
     62 
     63     while (isspace(c)) {
     64         EAT(c);
     65     }
     66 
     67     arg = 0;
     68     while (isdigit(c)) {
     69         arg = arg * 10 + c - '0';
     70         EAT(c);
     71     }
     72 
     73     while (isspace(c)) {
     74         EAT(c);
     75     }
     76 
     77     switch (c) {
     78     case 'q':
     79         exit((arg << 1) | 1);
     80         break;
     81     default:
     82         break;
     83     }
     84     return cur - testdev->in_buf;
     85 }
     86 
     87 /* The other end is writing some data.  Store it and try to interpret */
     88 static int testdev_chr_write(Chardev *chr, const uint8_t *buf, int len)
     89 {
     90     TestdevChardev *testdev = TESTDEV_CHARDEV(chr);
     91     int tocopy, eaten, orig_len = len;
     92 
     93     while (len) {
     94         /* Complete our buffer as much as possible */
     95         tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
     96 
     97         memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
     98         testdev->in_buf_used += tocopy;
     99         buf += tocopy;
    100         len -= tocopy;
    101 
    102         /* Interpret it as much as possible */
    103         while (testdev->in_buf_used > 0 &&
    104                (eaten = testdev_eat_packet(testdev)) > 0) {
    105             memmove(testdev->in_buf, testdev->in_buf + eaten,
    106                     testdev->in_buf_used - eaten);
    107             testdev->in_buf_used -= eaten;
    108         }
    109     }
    110     return orig_len;
    111 }
    112 
    113 static void char_testdev_class_init(ObjectClass *oc, void *data)
    114 {
    115     ChardevClass *cc = CHARDEV_CLASS(oc);
    116 
    117     cc->chr_write = testdev_chr_write;
    118 }
    119 
    120 static const TypeInfo char_testdev_type_info = {
    121     .name = TYPE_CHARDEV_TESTDEV,
    122     .parent = TYPE_CHARDEV,
    123     .instance_size = sizeof(TestdevChardev),
    124     .class_init = char_testdev_class_init,
    125 };
    126 
    127 static void register_types(void)
    128 {
    129     type_register_static(&char_testdev_type_info);
    130 }
    131 
    132 type_init(register_types);