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- /*
- * 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.
- *
- */
- #ifndef ASM_X86_ARCHRANDOM_H
- #define ASM_X86_ARCHRANDOM_H
- #include <asm/processor.h>
- #include <asm/cpufeature.h>
- #include <asm/alternative.h>
- #include <asm/nops.h>
- #define RDRAND_RETRY_LOOPS 10
- #define RDRAND_INT ".byte 0x0f,0xc7,0xf0"
- #ifdef CONFIG_X86_64
- # define RDRAND_LONG ".byte 0x48,0x0f,0xc7,0xf0"
- #else
- # define RDRAND_LONG RDRAND_INT
- #endif
- #ifdef CONFIG_ARCH_RANDOM
- #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; \
- }
- #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);
- #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);
- #endif /* CONFIG_X86_64 */
- #endif /* CONFIG_ARCH_RANDOM */
- extern void x86_init_rdrand(struct cpuinfo_x86 *c);
- #endif /* ASM_X86_ARCHRANDOM_H */
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