#include "ui/qemu-spice.h"
#define READ_BUF_LEN 4096
+#define CBUFF_SIZE 65536
/***********************************************************/
/* character device */
return d->outbuf_size;
}
+/*********************************************************/
+/*CircularMemory chardev*/
+
+typedef struct {
+ size_t size;
+ size_t prod;
+ size_t cons;
+ uint8_t *cbuf;
+} CirMemCharDriver;
+
+static bool cirmem_chr_is_empty(const CharDriverState *chr)
+{
+ const CirMemCharDriver *d = chr->opaque;
+
+ return d->cons == d->prod;
+}
+
+static size_t qemu_chr_cirmem_count(const CharDriverState *chr)
+{
+ const CirMemCharDriver *d = chr->opaque;
+
+ return (d->prod - d->cons);
+}
+
+static int cirmem_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
+{
+ CirMemCharDriver *d = chr->opaque;
+ int i;
+
+ if (!buf || (len < 0)) {
+ return -1;
+ }
+
+ for (i = 0; i < len; i++ ) {
+ /* Avoid writing the IAC information to the queue. */
+ if ((unsigned char)buf[i] == IAC) {
+ continue;
+ }
+
+ d->cbuf[d->prod++ % d->size] = buf[i];
+ if ((d->prod - d->cons) > d->size) {
+ d->cons = d->prod - d->size;
+ }
+ }
+
+ return 0;
+}
+
+static int cirmem_chr_read(CharDriverState *chr, uint8_t *buf, int len)
+{
+ CirMemCharDriver *d = chr->opaque;
+ int i;
+
+ for (i = 0; i < len && !cirmem_chr_is_empty(chr); i++) {
+ buf[i] = d->cbuf[d->cons++ % d->size];
+ }
+
+ return i;
+}
+
+static void cirmem_chr_close(struct CharDriverState *chr)
+{
+ CirMemCharDriver *d = chr->opaque;
+
+ g_free(d->cbuf);
+ g_free(d);
+ chr->opaque = NULL;
+}
+
+static CharDriverState *qemu_chr_open_cirmemchr(QemuOpts *opts)
+{
+ CharDriverState *chr;
+ CirMemCharDriver *d;
+
+ chr = g_malloc0(sizeof(CharDriverState));
+ d = g_malloc(sizeof(*d));
+
+ d->size = qemu_opt_get_number(opts, "maxcapacity", 0);
+ if (d->size == 0) {
+ d->size = CBUFF_SIZE;
+ }
+
+ /* The size must be power of 2 */
+ if (d->size & (d->size - 1)) {
+ fprintf(stderr, "chardev: size of memory device must be power of 2\n");
+ goto fail;
+ }
+
+ d->prod = 0;
+ d->cons = 0;
+ d->cbuf = g_malloc0(d->size);
+
+ chr->opaque = d;
+ chr->chr_write = cirmem_chr_write;
+ chr->chr_close = cirmem_chr_close;
+
+ return chr;
+
+fail:
+ g_free(d);
+ g_free(chr);
+ return NULL;
+}
+
+static bool qemu_is_chr(const CharDriverState *chr, const char *filename)
+{
+ return strcmp(chr->filename, filename);
+}
+
+void qmp_memchar_write(const char *device, int64_t size,
+ const char *data, bool has_format,
+ enum DataFormat format,
+ Error **errp)
+{
+ CharDriverState *chr;
+ guchar *write_data;
+ int ret;
+ gsize write_count;
+
+ chr = qemu_chr_find(device);
+ if (!chr) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return;
+ }
+
+ if (qemu_is_chr(chr, "memory")) {
+ error_setg(errp,"%s is not memory char device", device);
+ return;
+ }
+
+ write_count = (gsize)size;
+
+ if (has_format && (format == DATA_FORMAT_BASE64)) {
+ write_data = g_base64_decode(data, &write_count);
+ } else {
+ write_data = (uint8_t *)data;
+ }
+
+ ret = cirmem_chr_write(chr, write_data, write_count);
+
+ if (ret < 0) {
+ error_setg(errp, "Failed to write to device %s", device);
+ return;
+ }
+}
+
+MemCharRead *qmp_memchar_read(const char *device, int64_t size,
+ bool has_format, enum DataFormat format,
+ Error **errp)
+{
+ CharDriverState *chr;
+ guchar *read_data;
+ MemCharRead *meminfo;
+ size_t count;
+
+ chr = qemu_chr_find(device);
+ if (!chr) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return NULL;
+ }
+
+ if (qemu_is_chr(chr, "memory")) {
+ error_setg(errp,"%s is not memory char device", device);
+ return NULL;
+ }
+
+ if (size <= 0) {
+ error_setg(errp, "size must be greater than zero");
+ return NULL;
+ }
+
+ meminfo = g_malloc0(sizeof(MemCharRead));
+
+ count = qemu_chr_cirmem_count(chr);
+ if (count == 0) {
+ meminfo->data = g_strdup("");
+ return meminfo;
+ }
+
+ size = size > count ? count : size;
+ read_data = g_malloc0(size + 1);
+
+ meminfo->count = cirmem_chr_read(chr, read_data, size);
+
+ if (has_format && (format == DATA_FORMAT_BASE64)) {
+ meminfo->data = g_base64_encode(read_data, (size_t)meminfo->count);
+ } else {
+ meminfo->data = (char *)read_data;
+ }
+
+ return meminfo;
+}
+
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
{
char host[65], port[33], width[8], height[8];
qemu_opt_set(opts, "path", filename);
return opts;
}
+ if (strstart(filename, "memory", &p)) {
+ qemu_opt_set(opts, "backend", "memory");
+ qemu_opt_set(opts, "maxcapacity", p);
+ return opts;
+ }
if (strstart(filename, "file:", &p)) {
qemu_opt_set(opts, "backend", "file");
qemu_opt_set(opts, "path", p);
{ .name = "udp", .open = qemu_chr_open_udp },
{ .name = "msmouse", .open = qemu_chr_open_msmouse },
{ .name = "vc", .open = text_console_init },
+ { .name = "memory", .open = qemu_chr_open_cirmemchr },
#ifdef _WIN32
{ .name = "file", .open = qemu_chr_open_win_file_out },
{ .name = "pipe", .open = qemu_chr_open_win_pipe },
},{
.name = "debug",
.type = QEMU_OPT_NUMBER,
+ },{
+ .name = "maxcapacity",
+ .type = QEMU_OPT_NUMBER,
},
{ /* end of list */ }
},
projects / mirror_qemu.git / blobdiff