arch/loongarch/include/asm/vdso/getrandom.h

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2024 Xi Ruoyao <xry111@xry111.site>. All Rights Reserved.
   4  */
   5 #ifndef __ASM_VDSO_GETRANDOM_H
   6 #define __ASM_VDSO_GETRANDOM_H
   7
   8 #ifndef __ASSEMBLY__
   9
  10 #include <asm/unistd.h>
  11 #include <asm/vdso/vdso.h>
  12
  13 static __always_inline ssize_t getrandom_syscall(void *_buffer, size_t _len, unsigned int _flags)
  14 {
  15         register long ret asm("a0");
  16         register long nr asm("a7") = __NR_getrandom;
  17         register void *buffer asm("a0") = _buffer;
  18         register size_t len asm("a1") = _len;
  19         register unsigned int flags asm("a2") = _flags;
  20
  21         asm volatile(
  22         "      syscall 0\n"
  23         : "+r" (ret)
  24         : "r" (nr), "r" (buffer), "r" (len), "r" (flags)
  25         : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8",
  26           "memory");
  27
  28         return ret;
  29 }
  30
  31 static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void)
  32 {
  33         return &_loongarch_data.rng_data;
  34 }
  35
  36 #endif /* !__ASSEMBLY__ */
  37
  38 #endif /* __ASM_VDSO_GETRANDOM_H */