linux/arch/x86/kernel/cpu/rdrand.c
H. Peter Anvin 3b29039863 x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h
Use CC_SET()/CC_OUT() and static_cpu_has().  This produces code good
enough to eliminate ad hoc use of alternatives in <asm/archrandom.h>,
greatly simplifying the code.

While we are at it, make x86_init_rdrand() compile out completely if
we don't need it.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1465414726-197858-11-git-send-email-hpa@linux.intel.com

v2: fix a conflict between <linux/random.h> and <asm/archrandom.h>
    discovered by Ingo Molnar.  There are a few places in x86-specific
    code where we need all of <arch/archrandom.h> even when
    CONFIG_ARCH_RANDOM is disabled, so <linux/random.h> does not
    suffice.
2016-06-08 12:41:20 -07:00

60 lines
1.6 KiB
C

/*
* This file is part of the Linux kernel.
*
* Copyright (c) 2011, Intel Corporation
* Authors: Fenghua Yu <fenghua.yu@intel.com>,
* H. Peter Anvin <hpa@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <asm/processor.h>
#include <asm/archrandom.h>
#include <asm/sections.h>
static int __init x86_rdrand_setup(char *s)
{
setup_clear_cpu_cap(X86_FEATURE_RDRAND);
setup_clear_cpu_cap(X86_FEATURE_RDSEED);
return 1;
}
__setup("nordrand", x86_rdrand_setup);
/*
* RDRAND has Built-In-Self-Test (BIST) that runs on every invocation.
* Run the instruction a few times as a sanity check.
* If it fails, it is simple to disable RDRAND here.
*/
#define SANITY_CHECK_LOOPS 8
#ifdef CONFIG_ARCH_RANDOM
void x86_init_rdrand(struct cpuinfo_x86 *c)
{
unsigned long tmp;
int i;
if (!cpu_has(c, X86_FEATURE_RDRAND))
return;
for (i = 0; i < SANITY_CHECK_LOOPS; i++) {
if (!rdrand_long(&tmp)) {
clear_cpu_cap(c, X86_FEATURE_RDRAND);
pr_warn_once("rdrand: disabled\n");
return;
}
}
}
#endif