Turn Chardev into Object. qemu_chr_alloc() is replaced by the qemu_chardev_new() constructor. It will call qemu_char_open() to open/intialize the chardev with the ChardevCommon *backend settings. The CharDriver::create() callback is turned into a ChardevClass::open() which is called from the newly introduced qemu_chardev_open(). "chardev-gdb" and "chardev-hci" are internal chardev and aren't creatable directly with -chardev. Use a new internal flag to disable them. We may want to use TYPE_USER_CREATABLE interface instead, or perhaps allow -chardev usage. Although in general we keep typename and macros private, unless the type is being used by some other file, in this patch, all types and common helper macros for qemu-char.c are in char.h. This is to help transition now (some types must be declared early, while some aren't shared) and when splitting in several units. This is to be improved later. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*
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* QEMU Char Device for testsuite control
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*
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* Copyright (c) 2014 Red Hat, Inc.
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*
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* Author: Paolo Bonzini <pbonzini@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "sysemu/char.h"
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#define BUF_SIZE 32
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typedef struct {
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Chardev parent;
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uint8_t in_buf[32];
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int in_buf_used;
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} TestdevChardev;
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#define TYPE_CHARDEV_TESTDEV "chardev-testdev"
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#define TESTDEV_CHARDEV(obj) \
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OBJECT_CHECK(TestdevChardev, (obj), TYPE_CHARDEV_TESTDEV)
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/* Try to interpret a whole incoming packet */
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static int testdev_eat_packet(TestdevChardev *testdev)
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{
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const uint8_t *cur = testdev->in_buf;
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int len = testdev->in_buf_used;
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uint8_t c;
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int arg;
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#define EAT(c) do { \
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if (!len--) { \
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return 0; \
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} \
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c = *cur++; \
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} while (0)
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EAT(c);
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while (isspace(c)) {
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EAT(c);
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}
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arg = 0;
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while (isdigit(c)) {
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arg = arg * 10 + c - '0';
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EAT(c);
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}
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while (isspace(c)) {
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EAT(c);
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}
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switch (c) {
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case 'q':
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exit((arg << 1) | 1);
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break;
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default:
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break;
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}
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return cur - testdev->in_buf;
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}
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/* The other end is writing some data. Store it and try to interpret */
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static int testdev_chr_write(Chardev *chr, const uint8_t *buf, int len)
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{
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TestdevChardev *testdev = TESTDEV_CHARDEV(chr);
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int tocopy, eaten, orig_len = len;
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while (len) {
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/* Complete our buffer as much as possible */
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tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
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memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
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testdev->in_buf_used += tocopy;
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buf += tocopy;
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len -= tocopy;
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/* Interpret it as much as possible */
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while (testdev->in_buf_used > 0 &&
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(eaten = testdev_eat_packet(testdev)) > 0) {
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memmove(testdev->in_buf, testdev->in_buf + eaten,
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testdev->in_buf_used - eaten);
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testdev->in_buf_used -= eaten;
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}
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}
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return orig_len;
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}
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static void char_testdev_class_init(ObjectClass *oc, void *data)
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{
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ChardevClass *cc = CHARDEV_CLASS(oc);
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cc->chr_write = testdev_chr_write;
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}
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static const TypeInfo char_testdev_type_info = {
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.name = TYPE_CHARDEV_TESTDEV,
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.parent = TYPE_CHARDEV,
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.instance_size = sizeof(TestdevChardev),
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.class_init = char_testdev_class_init,
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};
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static void register_types(void)
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{
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static const CharDriver driver = {
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.kind = CHARDEV_BACKEND_KIND_TESTDEV,
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};
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register_char_driver(&driver);
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type_register_static(&char_testdev_type_info);
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}
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type_init(register_types);
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