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/* Helper functions for manipulating memory protection keys.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _ARCH_PKEY_H
#define _ARCH_PKEY_H
#include <sys/cdefs.h>
#define S1POE_PERM_NO_ACCESS 0b0000UL
#define S1POE_PERM_R 0b0001UL
#define S1POE_PERM_X 0b0010UL
#define S1POE_PERM_RX 0b0011UL
#define S1POE_PERM_W 0b0100UL
#define S1POE_PERM_RW 0b0101UL
#define S1POE_PERM_WX 0b0110UL
#define S1POE_PERM_RWX 0b0111UL
#define S1POE_PERM_MASK 0b1111UL
#define S1POE_BITS_PER_POI 4UL
/* Return the value of the POR_EL0 register. */
static __always_inline unsigned long
pkey_read (void)
{
unsigned long r;
__asm__ volatile ("mrs %0, s3_3_c10_c2_4" : "=r" (r));
return r;
}
/* Overwrite the POR_EL0 register with VALUE. */
static __always_inline void
pkey_write (unsigned long value)
{
__asm__ volatile ("msr s3_3_c10_c2_4, %0; isb" : : "r" (value));
}
#endif /* _ARCH_PKEY_H */
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