diff options
Diffstat (limited to 'qemu/backends/rng-egd.c')
| -rw-r--r-- | qemu/backends/rng-egd.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/qemu/backends/rng-egd.c b/qemu/backends/rng-egd.c deleted file mode 100644 index 7a1b9242d..000000000 --- a/qemu/backends/rng-egd.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * QEMU Random Number Generator Backend - * - * Copyright IBM, Corp. 2012 - * - * Authors: - * Anthony Liguori <aliguori@us.ibm.com> - * - * This work is licensed under the terms of the GNU GPL, version 2 or later. - * See the COPYING file in the top-level directory. - */ - -#include "qemu/osdep.h" -#include "sysemu/rng.h" -#include "sysemu/char.h" -#include "qapi/error.h" -#include "qapi/qmp/qerror.h" -#include "hw/qdev.h" /* just for DEFINE_PROP_CHR */ - -#define TYPE_RNG_EGD "rng-egd" -#define RNG_EGD(obj) OBJECT_CHECK(RngEgd, (obj), TYPE_RNG_EGD) - -typedef struct RngEgd -{ - RngBackend parent; - - CharDriverState *chr; - char *chr_name; -} RngEgd; - -static void rng_egd_request_entropy(RngBackend *b, RngRequest *req) -{ - RngEgd *s = RNG_EGD(b); - size_t size = req->size; - - while (size > 0) { - uint8_t header[2]; - uint8_t len = MIN(size, 255); - - /* synchronous entropy request */ - header[0] = 0x02; - header[1] = len; - - qemu_chr_fe_write(s->chr, header, sizeof(header)); - - size -= len; - } -} - -static int rng_egd_chr_can_read(void *opaque) -{ - RngEgd *s = RNG_EGD(opaque); - RngRequest *req; - int size = 0; - - QSIMPLEQ_FOREACH(req, &s->parent.requests, next) { - size += req->size - req->offset; - } - - return size; -} - -static void rng_egd_chr_read(void *opaque, const uint8_t *buf, int size) -{ - RngEgd *s = RNG_EGD(opaque); - size_t buf_offset = 0; - - while (size > 0 && !QSIMPLEQ_EMPTY(&s->parent.requests)) { - RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests); - int len = MIN(size, req->size - req->offset); - - memcpy(req->data + req->offset, buf + buf_offset, len); - buf_offset += len; - req->offset += len; - size -= len; - - if (req->offset == req->size) { - req->receive_entropy(req->opaque, req->data, req->size); - - rng_backend_finalize_request(&s->parent, req); - } - } -} - -static void rng_egd_opened(RngBackend *b, Error **errp) -{ - RngEgd *s = RNG_EGD(b); - - if (s->chr_name == NULL) { - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - "chardev", "a valid character device"); - return; - } - - s->chr = qemu_chr_find(s->chr_name); - if (s->chr == NULL) { - error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, - "Device '%s' not found", s->chr_name); - return; - } - - if (qemu_chr_fe_claim(s->chr) != 0) { - error_setg(errp, QERR_DEVICE_IN_USE, s->chr_name); - return; - } - - /* FIXME we should resubmit pending requests when the CDS reconnects. */ - qemu_chr_add_handlers(s->chr, rng_egd_chr_can_read, rng_egd_chr_read, - NULL, s); -} - -static void rng_egd_set_chardev(Object *obj, const char *value, Error **errp) -{ - RngBackend *b = RNG_BACKEND(obj); - RngEgd *s = RNG_EGD(b); - - if (b->opened) { - error_setg(errp, QERR_PERMISSION_DENIED); - } else { - g_free(s->chr_name); - s->chr_name = g_strdup(value); - } -} - -static char *rng_egd_get_chardev(Object *obj, Error **errp) -{ - RngEgd *s = RNG_EGD(obj); - - if (s->chr && s->chr->label) { - return g_strdup(s->chr->label); - } - - return NULL; -} - -static void rng_egd_init(Object *obj) -{ - object_property_add_str(obj, "chardev", - rng_egd_get_chardev, rng_egd_set_chardev, - NULL); -} - -static void rng_egd_finalize(Object *obj) -{ - RngEgd *s = RNG_EGD(obj); - - if (s->chr) { - qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL); - qemu_chr_fe_release(s->chr); - } - - g_free(s->chr_name); -} - -static void rng_egd_class_init(ObjectClass *klass, void *data) -{ - RngBackendClass *rbc = RNG_BACKEND_CLASS(klass); - - rbc->request_entropy = rng_egd_request_entropy; - rbc->opened = rng_egd_opened; -} - -static const TypeInfo rng_egd_info = { - .name = TYPE_RNG_EGD, - .parent = TYPE_RNG_BACKEND, - .instance_size = sizeof(RngEgd), - .class_init = rng_egd_class_init, - .instance_init = rng_egd_init, - .instance_finalize = rng_egd_finalize, -}; - -static void register_types(void) -{ - type_register_static(&rng_egd_info); -} - -type_init(register_types); |