diff options
Diffstat (limited to 'freebsd/sys/dev/random/harvest.c')
| -rw-r--r-- | freebsd/sys/dev/random/harvest.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/freebsd/sys/dev/random/harvest.c b/freebsd/sys/dev/random/harvest.c deleted file mode 100644 index f42d35d6..00000000 --- a/freebsd/sys/dev/random/harvest.c +++ /dev/null @@ -1,137 +0,0 @@ -#include <machine/rtems-bsd-kernel-space.h> - -/*- - * Copyright (c) 2000-2004 Mark R V Murray - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer - * in this position and unchanged. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <rtems/bsd/sys/param.h> -#include <sys/kthread.h> -#include <rtems/bsd/sys/lock.h> -#include <sys/malloc.h> -#include <sys/mutex.h> -#include <sys/poll.h> -#include <sys/queue.h> -#include <sys/random.h> -#include <sys/selinfo.h> -#include <sys/systm.h> -#include <sys/sysctl.h> - -#include <machine/cpu.h> - -#include <dev/random/randomdev_soft.h> - -static int read_random_phony(void *, int); - -/* Structure holding the desired entropy sources */ -struct harvest_select harvest = { 1, 1, 1, 0 }; - -/* hold the address of the routine which is actually called if - * the randomdev is loaded - */ -static void (*reap_func)(u_int64_t, const void *, u_int, u_int, u_int, - enum esource) = NULL; -static int (*read_func)(void *, int) = read_random_phony; - -/* Initialise the harvester at load time */ -void -random_yarrow_init_harvester(void (*reaper)(u_int64_t, const void *, u_int, - u_int, u_int, enum esource), int (*reader)(void *, int)) -{ - reap_func = reaper; - read_func = reader; -} - -/* Deinitialise the harvester at unload time */ -void -random_yarrow_deinit_harvester(void) -{ - reap_func = NULL; - read_func = read_random_phony; -} - -/* Entropy harvesting routine. This is supposed to be fast; do - * not do anything slow in here! - * Implemented as in indirect call to allow non-inclusion of - * the entropy device. - * - * XXXRW: get_cyclecount() is cheap on most modern hardware, where cycle - * counters are built in, but on older hardware it will do a real time clock - * read which can be quite expensive. - */ -void -random_harvest(void *entropy, u_int count, u_int bits, u_int frac, - enum esource origin) -{ - if (reap_func) - (*reap_func)(get_cyclecount(), entropy, count, bits, frac, - origin); -} - -/* Userland-visible version of read_random */ -int -read_random(void *buf, int count) -{ - return ((*read_func)(buf, count)); -} - -/* If the entropy device is not loaded, make a token effort to - * provide _some_ kind of randomness. This should only be used - * inside other RNG's, like arc4random(9). - */ -static int -read_random_phony(void *buf, int count) -{ - u_long randval; - int size, i; - - /* srandom() is called in kern/init_main.c:proc0_post() */ - - /* Fill buf[] with random(9) output */ - for (i = 0; i < count; i+= (int)sizeof(u_long)) { - randval = random(); - size = MIN(count - i, sizeof(u_long)); - memcpy(&((char *)buf)[i], &randval, (size_t)size); - } - - return (count); -} - -/* Helper routine to enable kproc_exit() to work while the module is - * being (or has been) unloaded. - * This routine is in this file because it is always linked into the kernel, - * and will thus never be unloaded. This is critical for unloadable modules - * that have threads. - */ -void -random_set_wakeup_exit(void *control) -{ - wakeup(control); - kproc_exit(0); - /* NOTREACHED */ -} |