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Implement the PKEYS interface, using the Permission Overlay Extension. Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20240822151113.1479789-19-joey.gouly@arm.com Signed-off-by: Will Deacon <will@kernel.org>
33 lines
635 B
C
33 lines
635 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2023 Arm Ltd.
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*/
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#ifndef _ASM_ARM64_POR_H
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#define _ASM_ARM64_POR_H
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#define POR_BITS_PER_PKEY 4
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#define POR_ELx_IDX(por_elx, idx) (((por_elx) >> ((idx) * POR_BITS_PER_PKEY)) & 0xf)
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static inline bool por_elx_allows_read(u64 por, u8 pkey)
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{
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u8 perm = POR_ELx_IDX(por, pkey);
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return perm & POE_R;
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}
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static inline bool por_elx_allows_write(u64 por, u8 pkey)
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{
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u8 perm = POR_ELx_IDX(por, pkey);
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return perm & POE_W;
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}
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static inline bool por_elx_allows_exec(u64 por, u8 pkey)
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{
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u8 perm = POR_ELx_IDX(por, pkey);
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return perm & POE_X;
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}
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#endif /* _ASM_ARM64_POR_H */
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