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powerpc: Refactor permission masks used for __P/__S table and kernel memory flags 

Prepare a common version of the permission masks that will be based
on _PAGE_NA, _PAGE_RO, _PAGE_ROX, _PAGE_RW, _PAGE_RWX that will be
defined in platform specific headers in later patches.

Put them in a new header pgtable-masks.h which will be included by
platforms.

And prepare a common version of flags used for mapping kernel memory
that will be based on _PAGE_RO, _PAGE_ROX, _PAGE_RW, _PAGE_RWX that
will be defined in platform specific headers.

Put them in unless _PAGE_KERNEL_RO is already defined so that platform
specific definitions can be dismantled one by one.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/d31b59efcdb38e675479563307af891aeadf6ec9.1695659959.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2023-09-25 20:31:39 +02:00 committed by Michael Ellerman
parent a785874736
commit a5a08dc90f
1 changed files with 30 additions and 0 deletions
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30
arch/powerpc/include/asm/pgtable-masks.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_PGTABLE_MASKS_H
#define _ASM_POWERPC_PGTABLE_MASKS_H
#ifndef _PAGE_NA
#define _PAGE_NA 0
#define _PAGE_RO _PAGE_READ
#define _PAGE_ROX (_PAGE_READ | _PAGE_EXEC)
#define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
#define _PAGE_RWX (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
#endif
/* Permission flags for kernel mappings */
#ifndef _PAGE_KERNEL_RO
#define _PAGE_KERNEL_RO _PAGE_RO
#define _PAGE_KERNEL_ROX _PAGE_ROX
#define _PAGE_KERNEL_RW (_PAGE_RW | _PAGE_DIRTY)
#define _PAGE_KERNEL_RWX (_PAGE_RWX | _PAGE_DIRTY)
#endif
/* Permission masks used to generate the __P and __S table */
#define PAGE_NONE __pgprot(_PAGE_BASE | _PAGE_NA)
#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW)
#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RWX)
#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_RO)
#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_ROX)
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_RO)
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_ROX)
#endif /* _ASM_POWERPC_PGTABLE_MASKS_H */