diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/cpu/rdrand.c')
-rw-r--r-- | ANDROID_3.4.5/arch/x86/kernel/cpu/rdrand.c | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/cpu/rdrand.c b/ANDROID_3.4.5/arch/x86/kernel/cpu/rdrand.c deleted file mode 100644 index feca286c..00000000 --- a/ANDROID_3.4.5/arch/x86/kernel/cpu/rdrand.c +++ /dev/null @@ -1,73 +0,0 @@ -/* - * 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); - return 1; -} -__setup("nordrand", x86_rdrand_setup); - -/* We can't use arch_get_random_long() here since alternatives haven't run */ -static inline int rdrand_long(unsigned long *v) -{ - int ok; - asm volatile("1: " RDRAND_LONG "\n\t" - "jc 2f\n\t" - "decl %0\n\t" - "jnz 1b\n\t" - "2:" - : "=r" (ok), "=a" (*v) - : "0" (RDRAND_RETRY_LOOPS)); - return ok; -} - -/* - * Force a reseed cycle; we are architecturally guaranteed a reseed - * after no more than 512 128-bit chunks of random data. This also - * acts as a test of the CPU capability. - */ -#define RESEED_LOOP ((512*128)/sizeof(unsigned long)) - -void __cpuinit x86_init_rdrand(struct cpuinfo_x86 *c) -{ -#ifdef CONFIG_ARCH_RANDOM - unsigned long tmp; - int i, count, ok; - - if (!cpu_has(c, X86_FEATURE_RDRAND)) - return; /* Nothing to do */ - - for (count = i = 0; i < RESEED_LOOP; i++) { - ok = rdrand_long(&tmp); - if (ok) - count++; - } - - if (count != RESEED_LOOP) - clear_cpu_cap(c, X86_FEATURE_RDRAND); -#endif -} |