blob: ecdcdbcd3392533e5619d7f09403d60a9810ceab (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/* 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>
#include <asm/vvar.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;
}
#define __vdso_rng_data (VVAR(_vdso_rng_data))
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_vdso_data - (void *)__arch_get_vdso_data());
return &__vdso_rng_data;
}
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_VDSO_GETRANDOM_H */
|
