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