new file mode 100644
@@ -0,0 +1,30 @@
+/* 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 */
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> --- arch/powerpc/include/asm/pgtable-masks.h | 30 ++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 arch/powerpc/include/asm/pgtable-masks.h