From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/x86/include/asm/archrandom.h | 136 +++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 kernel/arch/x86/include/asm/archrandom.h (limited to 'kernel/arch/x86/include/asm/archrandom.h') diff --git a/kernel/arch/x86/include/asm/archrandom.h b/kernel/arch/x86/include/asm/archrandom.h new file mode 100644 index 000000000..69f1366f1 --- /dev/null +++ b/kernel/arch/x86/include/asm/archrandom.h @@ -0,0 +1,136 @@ +/* + * This file is part of the Linux kernel. + * + * Copyright (c) 2011-2014, Intel Corporation + * Authors: Fenghua Yu , + * H. Peter Anvin + * + * 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. + * + */ + +#ifndef ASM_X86_ARCHRANDOM_H +#define ASM_X86_ARCHRANDOM_H + +#include +#include +#include +#include + +#define RDRAND_RETRY_LOOPS 10 + +#define RDRAND_INT ".byte 0x0f,0xc7,0xf0" +#define RDSEED_INT ".byte 0x0f,0xc7,0xf8" +#ifdef CONFIG_X86_64 +# define RDRAND_LONG ".byte 0x48,0x0f,0xc7,0xf0" +# define RDSEED_LONG ".byte 0x48,0x0f,0xc7,0xf8" +#else +# define RDRAND_LONG RDRAND_INT +# define RDSEED_LONG RDSEED_INT +#endif + +#ifdef CONFIG_ARCH_RANDOM + +/* Instead of arch_get_random_long() when 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; +} + +/* A single attempt at RDSEED */ +static inline bool rdseed_long(unsigned long *v) +{ + unsigned char ok; + asm volatile(RDSEED_LONG "\n\t" + "setc %0" + : "=qm" (ok), "=a" (*v)); + return ok; +} + +#define GET_RANDOM(name, type, rdrand, nop) \ +static inline int name(type *v) \ +{ \ + int ok; \ + alternative_io("movl $0, %0\n\t" \ + nop, \ + "\n1: " rdrand "\n\t" \ + "jc 2f\n\t" \ + "decl %0\n\t" \ + "jnz 1b\n\t" \ + "2:", \ + X86_FEATURE_RDRAND, \ + ASM_OUTPUT2("=r" (ok), "=a" (*v)), \ + "0" (RDRAND_RETRY_LOOPS)); \ + return ok; \ +} + +#define GET_SEED(name, type, rdseed, nop) \ +static inline int name(type *v) \ +{ \ + unsigned char ok; \ + alternative_io("movb $0, %0\n\t" \ + nop, \ + rdseed "\n\t" \ + "setc %0", \ + X86_FEATURE_RDSEED, \ + ASM_OUTPUT2("=q" (ok), "=a" (*v))); \ + return ok; \ +} + +#ifdef CONFIG_X86_64 + +GET_RANDOM(arch_get_random_long, unsigned long, RDRAND_LONG, ASM_NOP5); +GET_RANDOM(arch_get_random_int, unsigned int, RDRAND_INT, ASM_NOP4); + +GET_SEED(arch_get_random_seed_long, unsigned long, RDSEED_LONG, ASM_NOP5); +GET_SEED(arch_get_random_seed_int, unsigned int, RDSEED_INT, ASM_NOP4); + +#else + +GET_RANDOM(arch_get_random_long, unsigned long, RDRAND_LONG, ASM_NOP3); +GET_RANDOM(arch_get_random_int, unsigned int, RDRAND_INT, ASM_NOP3); + +GET_SEED(arch_get_random_seed_long, unsigned long, RDSEED_LONG, ASM_NOP4); +GET_SEED(arch_get_random_seed_int, unsigned int, RDSEED_INT, ASM_NOP4); + +#endif /* CONFIG_X86_64 */ + +#define arch_has_random() static_cpu_has(X86_FEATURE_RDRAND) +#define arch_has_random_seed() static_cpu_has(X86_FEATURE_RDSEED) + +#else + +static inline int rdrand_long(unsigned long *v) +{ + return 0; +} + +static inline bool rdseed_long(unsigned long *v) +{ + return 0; +} + +#endif /* CONFIG_ARCH_RANDOM */ + +extern void x86_init_rdrand(struct cpuinfo_x86 *c); + +#endif /* ASM_X86_ARCHRANDOM_H */ -- cgit 1.2.3-korg