[PATCH v2 25/37] powerpc: Refactor permission masks used for __P/__S table and kernel memory flags

Christophe Leroy christophe.leroy at csgroup.eu
Tue Sep 26 04:31:39 AEST 2023

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

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 at 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

diff --git a/arch/powerpc/include/asm/pgtable-masks.h b/arch/powerpc/include/asm/pgtable-masks.h
new file mode 100644
index 000000000000..808a3b9e8fc0
--- /dev/null
+++ b/arch/powerpc/include/asm/pgtable-masks.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _PAGE_NA
+#define _PAGE_NA	0
+#define _PAGE_RO	_PAGE_READ
+/* Permission flags for kernel mappings */
+#ifndef _PAGE_KERNEL_RO
+/* 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)

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