100631b48d
On rv32 the PFN part of PTEs is defined to use bits [xlen-1:10] while on rv64 it is defined to use bits [53:10], leaving [63:54] as reserved. With upcoming optional extensions like svpbmt these previously reserved bits will get used so simply right-shifting the PTE to get the PFN won't be enough. So introduce a _PAGE_PFN_MASK constant to mask the correct bits for both rv32 and rv64 before shifting. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu> Link: https://lore.kernel.org/r/20220511192921.2223629-9-heiko@sntech.de Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_PGTABLE_BITS_H
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#define _ASM_RISCV_PGTABLE_BITS_H
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#define _PAGE_ACCESSED_OFFSET 6
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#define _PAGE_PRESENT (1 << 0)
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#define _PAGE_READ (1 << 1) /* Readable */
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#define _PAGE_WRITE (1 << 2) /* Writable */
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#define _PAGE_EXEC (1 << 3) /* Executable */
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#define _PAGE_USER (1 << 4) /* User */
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#define _PAGE_GLOBAL (1 << 5) /* Global */
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#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
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#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
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#define _PAGE_SOFT (1 << 8) /* Reserved for software */
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#define _PAGE_SPECIAL _PAGE_SOFT
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#define _PAGE_TABLE _PAGE_PRESENT
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/*
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* _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
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* distinguish them from swapped out pages
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*/
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#define _PAGE_PROT_NONE _PAGE_GLOBAL
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#define _PAGE_PFN_SHIFT 10
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/* Set of bits to preserve across pte_modify() */
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#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
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_PAGE_WRITE | _PAGE_EXEC | \
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_PAGE_USER | _PAGE_GLOBAL))
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/*
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* when all of R/W/X are zero, the PTE is a pointer to the next level
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* of the page table; otherwise, it is a leaf PTE.
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*/
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#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
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#endif /* _ASM_RISCV_PGTABLE_BITS_H */
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