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powerpc32: adds handling of _PAGE_RO

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Some powerpc like the 8xx don't have a RW bit in PTE bits but a RO
(Read Only) bit.  This patch implements the handling of a _PAGE_RO flag
to be used in place of _PAGE_RW

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[scottwood@freescale.com: fix whitespace]
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
LEROY Christophe
2015-01-19 17:04:38 +01:00
committed by Scott Wood
parent d2caa3cebd
commit a7b9f671f2
4 changed files with 28 additions and 14 deletions
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25
arch/powerpc/include/asm/pte-common.h
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@@ -34,6 +34,12 @@
#ifndef _PAGE_PSIZE
#define _PAGE_PSIZE 0
#endif
/* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
#ifndef _PAGE_RO
#define _PAGE_RO 0
#else
#define _PAGE_RW 0
#endif
#ifndef _PMD_PRESENT_MASK
#define _PMD_PRESENT_MASK _PMD_PRESENT
#endif
@@ -42,10 +48,10 @@
#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
#endif
#ifndef _PAGE_KERNEL_RO
#define _PAGE_KERNEL_RO 0
#define _PAGE_KERNEL_RO (_PAGE_RO)
#endif
#ifndef _PAGE_KERNEL_ROX
#define _PAGE_KERNEL_ROX (_PAGE_EXEC)
#define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO)
#endif
#ifndef _PAGE_KERNEL_RW
#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
@@ -95,7 +101,7 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
/* Mask of bits returned by pte_pgprot() */
#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
_PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
_PAGE_USER | _PAGE_ACCESSED | \
_PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
_PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
#ifdef CONFIG_NUMA_BALANCING
@@ -128,11 +134,14 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
*/
#define PAGE_NONE __pgprot(_PAGE_BASE)
#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
_PAGE_EXEC)
#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
_PAGE_EXEC)
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
_PAGE_EXEC)
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY