1 files changed, 182 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
new file mode 100644
index 000000000000..a7e210b6b48c
--- /dev/null
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -0,0 +1,182 @@
+/* Included from asm/pgtable-*.h only ! */
+
+/*
+ * Some bits are only used on some cpu families... Make sure that all
+ * the undefined gets a sensible default
+ */
+#ifndef _PAGE_HASHPTE
+#define _PAGE_HASHPTE   0
+#endif
+#ifndef _PAGE_SHARED
+#define _PAGE_SHARED    0
+#endif
+#ifndef _PAGE_HWWRITE
+#define _PAGE_HWWRITE   0
+#endif
+#ifndef _PAGE_HWEXEC
+#define _PAGE_HWEXEC    0
+#endif
+#ifndef _PAGE_EXEC
+#define _PAGE_EXEC      0
+#endif
+#ifndef _PAGE_ENDIAN
+#define _PAGE_ENDIAN    0
+#endif
+#ifndef _PAGE_COHERENT
+#define _PAGE_COHERENT  0
+#endif
+#ifndef _PAGE_WRITETHRU
+#define _PAGE_WRITETHRU 0
+#endif
+#ifndef _PAGE_SPECIAL
+#define _PAGE_SPECIAL   0
+#endif
+#ifndef _PAGE_4K_PFN
+#define _PAGE_4K_PFN            0
+#endif
+#ifndef _PAGE_PSIZE
+#define _PAGE_PSIZE             0
+#endif
+#ifndef _PMD_PRESENT_MASK
+#define _PMD_PRESENT_MASK       _PMD_PRESENT
+#endif
+#ifndef _PMD_SIZE
+#define _PMD_SIZE       0
+#define PMD_PAGE_SIZE(pmd)      bad_call_to_PMD_PAGE_SIZE()
+#endif
+#ifndef _PAGE_KERNEL_RO
+#define _PAGE_KERNEL_RO 0
+#endif
+#ifndef _PAGE_KERNEL_RW
+#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
+#endif
+#ifndef _PAGE_HPTEFLAGS
+#define _PAGE_HPTEFLAGS _PAGE_HASHPTE
+#endif
+#ifndef _PTE_NONE_MASK
+#define _PTE_NONE_MASK  _PAGE_HPTEFLAGS
+#endif
+
+/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
+ * kernel without large page PMD support
+ */
+#ifndef __ASSEMBLY__
+extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
+#endif /* __ASSEMBLY__ */
+
+/* Location of the PFN in the PTE. Most 32-bit platforms use the same
+ * as _PAGE_SHIFT here (ie, naturally aligned).
+ * Platform who don't just pre-define the value so we don't override it here
+ */
+#ifndef PTE_RPN_SHIFT
+#define PTE_RPN_SHIFT   (PAGE_SHIFT)
+#endif
+
+/* The mask convered by the RPN must be a ULL on 32-bit platforms with
+ * 64-bit PTEs
+ */
+#if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
+#define PTE_RPN_MAX     (1ULL << (64 - PTE_RPN_SHIFT))
+#define PTE_RPN_MASK    (~((1ULL<<PTE_RPN_SHIFT)-1))
+#else
+#define PTE_RPN_MAX     (1UL << (32 - PTE_RPN_SHIFT))
+#define PTE_RPN_MASK    (~((1UL<<PTE_RPN_SHIFT)-1))
+#endif
+
+/* _PAGE_CHG_MASK masks of bits that are to be preserved accross
+ * pgprot changes
+ */
+#define _PAGE_CHG_MASK  (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
+                         _PAGE_ACCESSED | _PAGE_SPECIAL)
+
+/* 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_RW | _PAGE_HWWRITE | _PAGE_DIRTY | \
+                         _PAGE_EXEC | _PAGE_HWEXEC)
+
+/*
+ * We define 2 sets of base prot bits, one for basic pages (ie,
+ * cacheable kernel and user pages) and one for non cacheable
+ * pages. We always set _PAGE_COHERENT when SMP is enabled or
+ * the processor might need it for DMA coherency.
+ */
+#define _PAGE_BASE_NC   (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
+#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU)
+#define _PAGE_BASE      (_PAGE_BASE_NC | _PAGE_COHERENT)
+#else
+#define _PAGE_BASE      (_PAGE_BASE_NC)
+#endif
+
+/* Permission masks used to generate the __P and __S table,
+ *
+ * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
+ *
+ * Write permissions imply read permissions for now (we could make write-only
+ * pages on BookE but we don't bother for now). Execute permission control is
+ * possible on platforms that define _PAGE_EXEC
+ *
+ * Note due to the way vm flags are laid out, the bits are XWR
+ */
+#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 __P000  PAGE_NONE
+#define __P001  PAGE_READONLY
+#define __P010  PAGE_COPY
+#define __P011  PAGE_COPY
+#define __P100  PAGE_READONLY_X
+#define __P101  PAGE_READONLY_X
+#define __P110  PAGE_COPY_X
+#define __P111  PAGE_COPY_X
+
+#define __S000  PAGE_NONE
+#define __S001  PAGE_READONLY
+#define __S010  PAGE_SHARED
+#define __S011  PAGE_SHARED
+#define __S100  PAGE_READONLY_X
+#define __S101  PAGE_READONLY_X
+#define __S110  PAGE_SHARED_X
+#define __S111  PAGE_SHARED_X
+
+/* Permission masks used for kernel mappings */
+#define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
+#define PAGE_KERNEL_NC  __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
+                                 _PAGE_NO_CACHE)
+#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
+                                 _PAGE_NO_CACHE | _PAGE_GUARDED)
+#define PAGE_KERNEL_X   __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC | \
+                                 _PAGE_HWEXEC)
+#define PAGE_KERNEL_RO  __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
+#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC | \
+                                 _PAGE_HWEXEC)
+
+/* Protection used for kernel text. We want the debuggers to be able to
+ * set breakpoints anywhere, so don't write protect the kernel text
+ * on platforms where such control is possible.
+ */
+#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
+        defined(CONFIG_KPROBES)
+#define PAGE_KERNEL_TEXT        PAGE_KERNEL_X
+#else
+#define PAGE_KERNEL_TEXT        PAGE_KERNEL_ROX
+#endif
+
+/* Make modules code happy. We don't set RO yet */
+#define PAGE_KERNEL_EXEC        PAGE_KERNEL_X
+
+/* Advertise special mapping type for AGP */
+#define PAGE_AGP                (PAGE_KERNEL_NC)
+#define HAVE_PAGE_AGP
+
+/* Advertise support for _PAGE_SPECIAL */
+#ifdef _PAGE_SPECIAL
+#define __HAVE_ARCH_PTE_SPECIAL
+#endif
+