1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef __ASM_VDSO_GETRANDOM_H
4 #define __ASM_VDSO_GETRANDOM_H
5 
6 #ifndef __ASSEMBLY__
7 
8 #include <vdso/datapage.h>
9 #include <asm/vdso/vsyscall.h>
10 #include <asm/syscall.h>
11 #include <asm/unistd.h>
12 #include <asm/page.h>
13 
14 /**
15  * getrandom_syscall - Invoke the getrandom() syscall.
16  * @buffer:	Destination buffer to fill with random bytes.
17  * @len:	Size of @buffer in bytes.
18  * @flags:	Zero or more GRND_* flags.
19  * Returns:	The number of random bytes written to @buffer, or a negative value indicating an error.
20  */
getrandom_syscall(void * buffer,size_t len,unsigned int flags)21 static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags)
22 {
23 	return syscall3(__NR_getrandom, (long)buffer, (long)len, (long)flags);
24 }
25 
26 #endif /* !__ASSEMBLY__ */
27 
28 #endif /* __ASM_VDSO_GETRANDOM_H */
29