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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France
*/
#ifndef _ASM_POWERPC_VDSO_GETRANDOM_H
#define _ASM_POWERPC_VDSO_GETRANDOM_H
#ifndef __ASSEMBLY__
static __always_inline int do_syscall_3(const unsigned long _r0, const unsigned long _r3,
const unsigned long _r4, const unsigned long _r5)
{
register long r0 asm("r0") = _r0;
register unsigned long r3 asm("r3") = _r3;
register unsigned long r4 asm("r4") = _r4;
register unsigned long r5 asm("r5") = _r5;
register int ret asm ("r3");
asm volatile(
" sc\n"
" bns+ 1f\n"
" neg %0, %0\n"
"1:\n"
: "=r" (ret), "+r" (r4), "+r" (r5), "+r" (r0)
: "r" (r3)
: "memory", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cr0", "ctr");
return ret;
}
/**
* 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 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)
{
return do_syscall_3(__NR_getrandom, (unsigned long)buffer,
(unsigned long)len, (unsigned long)flags);
}
static __always_inline struct vdso_rng_data *__arch_get_vdso_rng_data(void)
{
return NULL;
}
ssize_t __c_kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state,
size_t opaque_len, const struct vdso_rng_data *vd);
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_POWERPC_VDSO_GETRANDOM_H */
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