^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file is part of the Linux kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2011-2014, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Authors: Fenghua Yu <fenghua.yu@intel.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * H. Peter Anvin <hpa@linux.intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #ifndef ASM_X86_ARCHRANDOM_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define ASM_X86_ARCHRANDOM_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define RDRAND_RETRY_LOOPS 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /* Unconditional execution of RDRAND and RDSEED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static inline bool __must_check rdrand_long(unsigned long *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) bool ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) unsigned int retry = RDRAND_RETRY_LOOPS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) asm volatile("rdrand %[out]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) CC_SET(c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) : CC_OUT(c) (ok), [out] "=r" (*v));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (ok)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) } while (--retry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static inline bool __must_check rdrand_int(unsigned int *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) bool ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned int retry = RDRAND_RETRY_LOOPS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) asm volatile("rdrand %[out]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) CC_SET(c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) : CC_OUT(c) (ok), [out] "=r" (*v));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (ok)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) } while (--retry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static inline bool __must_check rdseed_long(unsigned long *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) bool ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) asm volatile("rdseed %[out]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) CC_SET(c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) : CC_OUT(c) (ok), [out] "=r" (*v));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static inline bool __must_check rdseed_int(unsigned int *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) bool ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) asm volatile("rdseed %[out]"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) CC_SET(c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) : CC_OUT(c) (ok), [out] "=r" (*v));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * These are the generic interfaces; they must not be declared if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * stubs in <linux/random.h> are to be invoked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * i.e. CONFIG_ARCH_RANDOM is not defined.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #ifdef CONFIG_ARCH_RANDOM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static inline bool __must_check arch_get_random_long(unsigned long *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return static_cpu_has(X86_FEATURE_RDRAND) ? rdrand_long(v) : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static inline bool __must_check arch_get_random_int(unsigned int *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return static_cpu_has(X86_FEATURE_RDRAND) ? rdrand_int(v) : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return static_cpu_has(X86_FEATURE_RDSEED) ? rdseed_long(v) : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return static_cpu_has(X86_FEATURE_RDSEED) ? rdseed_int(v) : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) extern void x86_init_rdrand(struct cpuinfo_x86 *c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #else /* !CONFIG_ARCH_RANDOM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static inline void x86_init_rdrand(struct cpuinfo_x86 *c) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #endif /* !CONFIG_ARCH_RANDOM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #endif /* ASM_X86_ARCHRANDOM_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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