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/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2022-2024 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */ #ifndef __ASM_VDSO_GETRANDOM_H #define __ASM_VDSO_GETRANDOM_H #ifndef __ASSEMBLY__ #include <asm/unistd.h> /** * getrandom_syscall - Invoke the getrandom() syscall. * @buffer: Destination buffer to fill with random bytes. * @len: Size of @buffer in bytes. * @flags: Zero or more GRND_* flags. * Returns: The number of random bytes written to @buffer, or a negative value indicating an error. */ static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags) { long ret; asm ("syscall" : "=a" (ret) : "0" (__NR_getrandom), "D" (buffer), "S" (len), "d" (flags) : "rcx", "r11", "memory"); return ret; } extern struct vdso_rng_data vdso_rng_data __attribute__((visibility("hidden"))); static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void) { if (IS_ENABLED(CONFIG_TIME_NS) && __arch_get_vdso_data()->clock_mode == VDSO_CLOCKMODE_TIMENS) return (void *)&vdso_rng_data + ((void *)&timens_page - (void *)__arch_get_vdso_data()); return &vdso_rng_data; } #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETRANDOM_H */