mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 22:55:21 +07:00
e3613bb8af
Previously, invalid PTEs and swap PTEs had the same binary representation, causing errors when attempting to unmap PROT_NONE mappings, including implicit unmap on exit. Typical error: swap_info_get: Bad swap file entry 40000000007a9879 BUG: Bad page map in process a.out pte:3d4c3cc0 pmd:3e521401 Cc: stable@vger.kernel.org Signed-off-by: Stefan O'Rear <sorear2@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
|
|
* Copyright (C) 2012 Regents of the University of California
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_RISCV_PGTABLE_BITS_H
|
|
#define _ASM_RISCV_PGTABLE_BITS_H
|
|
|
|
/*
|
|
* PTE format:
|
|
* | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
|
|
* PFN reserved for SW D A G U X W R V
|
|
*/
|
|
|
|
#define _PAGE_ACCESSED_OFFSET 6
|
|
|
|
#define _PAGE_PRESENT (1 << 0)
|
|
#define _PAGE_READ (1 << 1) /* Readable */
|
|
#define _PAGE_WRITE (1 << 2) /* Writable */
|
|
#define _PAGE_EXEC (1 << 3) /* Executable */
|
|
#define _PAGE_USER (1 << 4) /* User */
|
|
#define _PAGE_GLOBAL (1 << 5) /* Global */
|
|
#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
|
|
#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
|
|
#define _PAGE_SOFT (1 << 8) /* Reserved for software */
|
|
|
|
#define _PAGE_SPECIAL _PAGE_SOFT
|
|
#define _PAGE_TABLE _PAGE_PRESENT
|
|
|
|
/*
|
|
* _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
|
|
* distinguish them from swapped out pages
|
|
*/
|
|
#define _PAGE_PROT_NONE _PAGE_READ
|
|
|
|
#define _PAGE_PFN_SHIFT 10
|
|
|
|
/* Set of bits to preserve across pte_modify() */
|
|
#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
|
|
_PAGE_WRITE | _PAGE_EXEC | \
|
|
_PAGE_USER | _PAGE_GLOBAL))
|
|
|
|
#endif /* _ASM_RISCV_PGTABLE_BITS_H */
|