mirror of https://gitee.com/openkylin/qemu.git
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/*
|
|
* QEMU Char Device for testsuite control
|
|
*
|
|
* Copyright (c) 2014 Red Hat, Inc.
|
|
*
|
|
* Author: Paolo Bonzini <pbonzini@redhat.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
#include "qemu-common.h"
|
|
#include "sysemu/char.h"
|
|
|
|
#define BUF_SIZE 32
|
|
|
|
typedef struct {
|
|
CharDriverState *chr;
|
|
uint8_t in_buf[32];
|
|
int in_buf_used;
|
|
} TestdevCharState;
|
|
|
|
/* Try to interpret a whole incoming packet */
|
|
static int testdev_eat_packet(TestdevCharState *testdev)
|
|
{
|
|
const uint8_t *cur = testdev->in_buf;
|
|
int len = testdev->in_buf_used;
|
|
uint8_t c;
|
|
int arg;
|
|
|
|
#define EAT(c) do { \
|
|
if (!len--) { \
|
|
return 0; \
|
|
} \
|
|
c = *cur++; \
|
|
} while (0)
|
|
|
|
EAT(c);
|
|
|
|
while (isspace(c)) {
|
|
EAT(c);
|
|
}
|
|
|
|
arg = 0;
|
|
while (isdigit(c)) {
|
|
arg = arg * 10 + c - '0';
|
|
EAT(c);
|
|
}
|
|
|
|
while (isspace(c)) {
|
|
EAT(c);
|
|
}
|
|
|
|
switch (c) {
|
|
case 'q':
|
|
exit((arg << 1) | 1);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return cur - testdev->in_buf;
|
|
}
|
|
|
|
/* The other end is writing some data. Store it and try to interpret */
|
|
static int testdev_write(CharDriverState *chr, const uint8_t *buf, int len)
|
|
{
|
|
TestdevCharState *testdev = chr->opaque;
|
|
int tocopy, eaten, orig_len = len;
|
|
|
|
while (len) {
|
|
/* Complete our buffer as much as possible */
|
|
tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
|
|
|
|
memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
|
|
testdev->in_buf_used += tocopy;
|
|
buf += tocopy;
|
|
len -= tocopy;
|
|
|
|
/* Interpret it as much as possible */
|
|
while (testdev->in_buf_used > 0 &&
|
|
(eaten = testdev_eat_packet(testdev)) > 0) {
|
|
memmove(testdev->in_buf, testdev->in_buf + eaten,
|
|
testdev->in_buf_used - eaten);
|
|
testdev->in_buf_used -= eaten;
|
|
}
|
|
}
|
|
return orig_len;
|
|
}
|
|
|
|
static void testdev_close(struct CharDriverState *chr)
|
|
{
|
|
TestdevCharState *testdev = chr->opaque;
|
|
|
|
g_free(testdev);
|
|
}
|
|
|
|
CharDriverState *chr_testdev_init(void)
|
|
{
|
|
TestdevCharState *testdev;
|
|
CharDriverState *chr;
|
|
|
|
testdev = g_malloc0(sizeof(TestdevCharState));
|
|
testdev->chr = chr = g_malloc0(sizeof(CharDriverState));
|
|
|
|
chr->opaque = testdev;
|
|
chr->chr_write = testdev_write;
|
|
chr->chr_close = testdev_close;
|
|
|
|
return chr;
|
|
}
|
|
|
|
static void register_types(void)
|
|
{
|
|
register_char_driver_qapi("testdev", CHARDEV_BACKEND_KIND_TESTDEV, NULL);
|
|
}
|
|
|
|
type_init(register_types);
|