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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "primpl.h"
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#if defined(SOLARIS)
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
hrtime_t t;
t = gethrtime();
if (t) {
return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
}
return 0;
}
#elif defined(HPUX)
#ifdef __ia64
#include <ia64/sys/inline.h>
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
PRUint64 t;
#ifdef __GNUC__
__asm__ __volatile__("mov %0 = ar.itc" : "=r" (t));
#else
t = _Asm_mov_from_ar(_AREG44);
#endif
return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
}
#else
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
extern int ret_cr16();
int cr16val;
cr16val = ret_cr16();
return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val)));
}
#endif
#elif defined(OSF1)
#include <c_asm.h>
/*
* Use the "get the cycle counter" instruction on the alpha.
* The low 32 bits completely turn over in less than a minute.
* The high 32 bits are some non-counter gunk that changes sometimes.
*/
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
unsigned long t;
#ifdef __GNUC__
__asm__("rpcc %0" : "=r" (t));
#else
t = asm("rpcc %v0");
#endif
return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
}
#elif defined(AIX)
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
return 0;
}
#elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \
|| defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \
|| defined(SYMBIAN) || defined(__GNU__))
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
static int fdDevURandom;
static PRCallOnceType coOpenDevURandom;
static PRStatus OpenDevURandom( void )
{
fdDevURandom = open( "/dev/urandom", O_RDONLY );
return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );
} /* end OpenDevURandom() */
static size_t GetDevURandom( void *buf, size_t size )
{
int bytesIn;
int rc;
rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );
if ( PR_FAILURE == rc ) {
_PR_MD_MAP_OPEN_ERROR( errno );
return(0);
}
bytesIn = read( fdDevURandom, buf, size );
if ( -1 == bytesIn ) {
_PR_MD_MAP_READ_ERROR( errno );
return(0);
}
return( bytesIn );
} /* end GetDevURandom() */
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
return(GetDevURandom( buf, maxbytes ));
}
#elif defined(IRIX)
#include <fcntl.h>
#undef PRIVATE
#include <sys/mman.h>
#include <sys/syssgi.h>
#include <sys/immu.h>
#include <sys/systeminfo.h>
#include <sys/utsname.h>
static size_t GetHighResClock(void *buf, size_t maxbuf)
{
unsigned phys_addr, raddr, cycleval;
static volatile unsigned *iotimer_addr = NULL;
static int tries = 0;
static int cntr_size;
int mfd;
unsigned s0[2];
#ifndef SGI_CYCLECNTR_SIZE
#define SGI_CYCLECNTR_SIZE 165 /* Size user needs to use to read CC */
#endif
if (iotimer_addr == NULL) {
if (tries++ > 1) {
/* Don't keep trying if it didn't work */
return 0;
}
/*
** For SGI machines we can use the cycle counter, if it has one,
** to generate some truly random numbers
*/
phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
if (phys_addr) {
int pgsz = getpagesize();
int pgoffmask = pgsz - 1;
raddr = phys_addr & ~pgoffmask;
mfd = open("/dev/mmem", O_RDONLY);
if (mfd < 0) {
return 0;
}
iotimer_addr = (unsigned *)
mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);
if (iotimer_addr == (unsigned*)-1) {
close(mfd);
iotimer_addr = NULL;
return 0;
}
iotimer_addr = (unsigned*)
((__psint_t)iotimer_addr | (phys_addr & pgoffmask));
/*
* The file 'mfd' is purposefully not closed.
*/
cntr_size = syssgi(SGI_CYCLECNTR_SIZE);
if (cntr_size < 0) {
struct utsname utsinfo;
/*
* We must be executing on a 6.0 or earlier system, since the
* SGI_CYCLECNTR_SIZE call is not supported.
*
* The only pre-6.1 platforms with 64-bit counters are
* IP19 and IP21 (Challenge, PowerChallenge, Onyx).
*/
uname(&utsinfo);
if (!strncmp(utsinfo.machine, "IP19", 4) ||
!strncmp(utsinfo.machine, "IP21", 4))
cntr_size = 64;
else
cntr_size = 32;
}
cntr_size /= 8; /* Convert from bits to bytes */
}
}
s0[0] = *iotimer_addr;
if (cntr_size > 4)
s0[1] = *(iotimer_addr + 1);
memcpy(buf, (char *)&s0[0], cntr_size);
return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size);
}
#elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \
|| defined(QNX) || defined(DARWIN) || defined(RISCOS)
#include <sys/times.h>
static size_t
GetHighResClock(void *buf, size_t maxbytes)
{
int ticks;
struct tms buffer;
ticks=times(&buffer);
return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
}
#else
#error! Platform undefined
#endif /* defined(SOLARIS) */
extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
{
struct timeval tv;
int n = 0;
int s;
n += GetHighResClock(buf, size);
size -= n;
GETTIMEOFDAY(&tv);
if ( size > 0 ) {
s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));
size -= s;
n += s;
}
if ( size > 0 ) {
s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));
size -= s;
n += s;
}
return n;
} /* end _PR_MD_GetRandomNoise() */
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