mirror of https://gitee.com/openkylin/linux.git
powerpc/mm: Merge various PTE bits and accessors definitions
Now that they are almost identical, we can merge some of the definitions related to the PTE format into common files. This creates a new pte-common.h which is included by both 32 and 64-bit right after the CPU specific pte-*.h file, and which defines some bits to "default" values if they haven't been defined already, and then provides a generic definition of most of the bit combinations based on these and exposed to the rest of the kernel. I also moved to the common pgtable.h most of the "small" accessors to the PTE bits and modification helpers (pte_mk*). The actual accessors remain in their separate files. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
parent
8d1cf34e7a
commit
71087002cf
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@ -97,174 +97,11 @@ extern int icache_44x_need_flush;
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#include <asm/pte-hash32.h>
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#endif
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/* If _PAGE_SPECIAL is defined, then we advertise our support for it */
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#ifdef _PAGE_SPECIAL
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#define __HAVE_ARCH_PTE_SPECIAL
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#endif
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/*
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* Some bits are only used on some cpu families... Make sure that all
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* the undefined gets defined as 0
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*/
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#ifndef _PAGE_HASHPTE
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#define _PAGE_HASHPTE 0
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#endif
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#ifndef _PTE_NONE_MASK
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#define _PTE_NONE_MASK 0
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#endif
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#ifndef _PAGE_SHARED
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#define _PAGE_SHARED 0
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#endif
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#ifndef _PAGE_HWWRITE
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#define _PAGE_HWWRITE 0
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#endif
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#ifndef _PAGE_HWEXEC
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#define _PAGE_HWEXEC 0
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#endif
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#ifndef _PAGE_EXEC
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#define _PAGE_EXEC 0
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#endif
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#ifndef _PAGE_ENDIAN
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#define _PAGE_ENDIAN 0
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#endif
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#ifndef _PAGE_COHERENT
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#define _PAGE_COHERENT 0
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#endif
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#ifndef _PAGE_WRITETHRU
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#define _PAGE_WRITETHRU 0
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#endif
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#ifndef _PAGE_SPECIAL
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#define _PAGE_SPECIAL 0
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#endif
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#ifndef _PMD_PRESENT_MASK
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#define _PMD_PRESENT_MASK _PMD_PRESENT
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#endif
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#ifndef _PMD_SIZE
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#define _PMD_SIZE 0
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#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
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#endif
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#ifndef _PAGE_KERNEL_RO
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#define _PAGE_KERNEL_RO 0
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#endif
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#ifndef _PAGE_KERNEL_RW
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#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
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#endif
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#define _PAGE_HPTEFLAGS _PAGE_HASHPTE
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/* Location of the PFN in the PTE. Most platforms use the same as _PAGE_SHIFT
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* here (ie, naturally aligned). Platform who don't just pre-define the
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* value so we don't override it here
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*/
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#ifndef PTE_RPN_SHIFT
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#define PTE_RPN_SHIFT (PAGE_SHIFT)
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#endif
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#ifdef CONFIG_PTE_64BIT
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#define PTE_RPN_MAX (1ULL << (64 - PTE_RPN_SHIFT))
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#define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1))
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#else
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#define PTE_RPN_MAX (1UL << (32 - PTE_RPN_SHIFT))
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#define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
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#endif
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/* _PAGE_CHG_MASK masks of bits that are to be preserved accross
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* pgprot changes
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*/
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
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_PAGE_ACCESSED | _PAGE_SPECIAL)
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/* Mask of bits returned by pte_pgprot() */
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#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
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_PAGE_WRITETHRU | _PAGE_ENDIAN | \
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_PAGE_USER | _PAGE_ACCESSED | \
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_PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | \
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_PAGE_EXEC | _PAGE_HWEXEC)
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/*
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* We define 2 sets of base prot bits, one for basic pages (ie,
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* cacheable kernel and user pages) and one for non cacheable
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* pages. We always set _PAGE_COHERENT when SMP is enabled or
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* the processor might need it for DMA coherency.
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*/
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#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU)
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#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
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#else
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#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
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#endif
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#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED)
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/* Permission masks used for kernel mappings */
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#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
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#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
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_PAGE_NO_CACHE)
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#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
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_PAGE_NO_CACHE | _PAGE_GUARDED)
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#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
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#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC)
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#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
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defined(CONFIG_KPROBES)
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/* We want the debuggers to be able to set breakpoints anywhere, so
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* don't write protect the kernel text */
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#define PAGE_KERNEL_TEXT PAGE_KERNEL_X
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#else
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#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
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#endif
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#define PAGE_NONE __pgprot(_PAGE_BASE)
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#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
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#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
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#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
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#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
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#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
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#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
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/*
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* The PowerPC can only do execute protection on a segment (256MB) basis,
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* not on a page basis. So we consider execute permission the same as read.
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* Also, write permissions imply read permissions.
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* This is the closest we can get..
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*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY_X
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY_X
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#define __P100 PAGE_READONLY
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#define __P101 PAGE_READONLY_X
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#define __P110 PAGE_COPY
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#define __P111 PAGE_COPY_X
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY_X
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED_X
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#define __S100 PAGE_READONLY
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#define __S101 PAGE_READONLY_X
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#define __S110 PAGE_SHARED
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#define __S111 PAGE_SHARED_X
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/* And here we include common definitions */
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#include <asm/pte-common.h>
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#ifndef __ASSEMBLY__
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/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
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* kernel without large page PMD support */
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extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
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/*
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* Conversions between PTE values and page frame numbers.
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*/
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#define pte_pfn(x) (pte_val(x) >> PTE_RPN_SHIFT)
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pfn_pte(pfn, prot) __pte(((pte_basic_t)(pfn) << PTE_RPN_SHIFT) |\
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pgprot_val(prot))
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#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
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#endif /* __ASSEMBLY__ */
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#define pte_none(pte) ((pte_val(pte) & ~_PTE_NONE_MASK) == 0)
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#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
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#define pte_clear(mm, addr, ptep) \
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do { pte_update(ptep, ~_PAGE_HASHPTE, 0); } while (0)
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@ -273,43 +110,6 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
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#define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
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#define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0)
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#ifndef __ASSEMBLY__
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
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static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
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static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
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static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
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static inline pte_t pte_wrprotect(pte_t pte) {
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pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
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static inline pte_t pte_mkclean(pte_t pte) {
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pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
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static inline pte_t pte_mkold(pte_t pte) {
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pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mkwrite(pte_t pte) {
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pte_val(pte) |= _PAGE_RW; return pte; }
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static inline pte_t pte_mkdirty(pte_t pte) {
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pte_val(pte) |= _PAGE_DIRTY; return pte; }
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static inline pte_t pte_mkyoung(pte_t pte) {
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pte_val(pte) |= _PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mkspecial(pte_t pte) {
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pte_val(pte) |= _PAGE_SPECIAL; return pte; }
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static inline pgprot_t pte_pgprot(pte_t pte)
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{
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return __pgprot(pte_val(pte) & PAGE_PROT_BITS);
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}
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
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return pte;
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}
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/*
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* When flushing the tlb entry for a page, we also need to flush the hash
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* table entry. flush_hash_pages is assembler (for speed) in hashtable.S.
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@ -80,82 +80,8 @@
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* Include the PTE bits definitions
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*/
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#include <asm/pte-hash64.h>
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#include <asm/pte-common.h>
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/* Some other useful definitions */
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#define PTE_RPN_MAX (1UL << (64 - PTE_RPN_SHIFT))
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#define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
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/* _PAGE_CHG_MASK masks of bits that are to be preserved accross
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* pgprot changes
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*/
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#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
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_PAGE_ACCESSED | _PAGE_SPECIAL)
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#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
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#define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
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/* Permission masks used to generate the __P and __S table,
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*
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* Note:__pgprot is defined in arch/powerpc/include/asm/page.h
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*/
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#define PAGE_NONE __pgprot(_PAGE_BASE)
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#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
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#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
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#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
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#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
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#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
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#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
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/* Permission masks used for kernel mappings */
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#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
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#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
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_PAGE_NO_CACHE)
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#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
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_PAGE_NO_CACHE | _PAGE_GUARDED)
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#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
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#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC)
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/* Protection bits for use by pte_pgprot() */
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#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | \
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_PAGE_NO_CACHE | _PAGE_WRITETHRU | \
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_PAGE_4K_PFN | _PAGE_USER | _PAGE_RW | \
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_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_EXEC)
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/* We always have _PAGE_SPECIAL on 64 bit */
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#define __HAVE_ARCH_PTE_SPECIAL
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/* Make modules code happy. We don't set RO yet */
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#define PAGE_KERNEL_EXEC PAGE_KERNEL_X
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/*
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* POWER4 and newer have per page execute protection, older chips can only
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* do this on a segment (256MB) basis.
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*
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* Also, write permissions imply read permissions.
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* This is the closest we can get..
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*
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* Note due to the way vm flags are laid out, the bits are XWR
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*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY_X
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#define __P101 PAGE_READONLY_X
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#define __P110 PAGE_COPY_X
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#define __P111 PAGE_COPY_X
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY_X
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#define __S101 PAGE_READONLY_X
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#define __S110 PAGE_SHARED_X
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#define __S111 PAGE_SHARED_X
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#ifdef CONFIG_PPC_MM_SLICES
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#define HAVE_ARCH_UNMAPPED_AREA
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@ -196,34 +122,8 @@
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#endif /* __real_pte */
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*
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* mk_pte takes a (struct page *) as input
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*/
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
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{
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pte_t pte;
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pte_val(pte) = (pfn << PTE_RPN_SHIFT) | pgprot_val(pgprot);
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return pte;
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}
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#define pte_modify(_pte, newprot) \
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(__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
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#define pte_none(pte) ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
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#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
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/* pte_clear moved to later in this file */
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#define pte_pfn(x) ((unsigned long)((pte_val(x)>>PTE_RPN_SHIFT)))
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
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#define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
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@ -271,36 +171,6 @@ static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
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/* This now only contains the vmalloc pages */
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
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static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
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static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
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static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
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static inline pte_t pte_wrprotect(pte_t pte) {
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pte_val(pte) &= ~(_PAGE_RW); return pte; }
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static inline pte_t pte_mkclean(pte_t pte) {
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pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
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static inline pte_t pte_mkold(pte_t pte) {
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pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mkwrite(pte_t pte) {
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pte_val(pte) |= _PAGE_RW; return pte; }
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static inline pte_t pte_mkdirty(pte_t pte) {
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pte_val(pte) |= _PAGE_DIRTY; return pte; }
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static inline pte_t pte_mkyoung(pte_t pte) {
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pte_val(pte) |= _PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mkhuge(pte_t pte) {
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return pte; }
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static inline pte_t pte_mkspecial(pte_t pte) {
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pte_val(pte) |= _PAGE_SPECIAL; return pte; }
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static inline pgprot_t pte_pgprot(pte_t pte)
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{
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return __pgprot(pte_val(pte) & PAGE_PROT_BITS);
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}
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/* Atomic PTE updates */
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static inline unsigned long pte_update(struct mm_struct *mm,
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@ -25,12 +25,58 @@ static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
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# include <asm/pgtable-ppc32.h>
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#endif
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/* Special mapping for AGP */
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#define PAGE_AGP (PAGE_KERNEL_NC)
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#define HAVE_PAGE_AGP
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
/* Generic accessors to PTE bits */
|
||||
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
|
||||
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
|
||||
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
|
||||
static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
|
||||
static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
|
||||
static inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_PRESENT; }
|
||||
static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
|
||||
static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
|
||||
|
||||
/* Conversion functions: convert a page and protection to a page entry,
|
||||
* and a page entry and page directory to the page they refer to.
|
||||
*
|
||||
* Even if PTEs can be unsigned long long, a PFN is always an unsigned
|
||||
* long for now.
|
||||
*/
|
||||
static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) {
|
||||
return __pte(((pte_basic_t)(pfn) << PTE_RPN_SHIFT) |
|
||||
pgprot_val(pgprot)); }
|
||||
static inline unsigned long pte_pfn(pte_t pte) {
|
||||
return pte_val(pte) >> PTE_RPN_SHIFT; }
|
||||
|
||||
/* Keep these as a macros to avoid include dependency mess */
|
||||
#define pte_page(x) pfn_to_page(pte_pfn(x))
|
||||
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
|
||||
|
||||
/* Generic modifiers for PTE bits */
|
||||
static inline pte_t pte_wrprotect(pte_t pte) {
|
||||
pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
|
||||
static inline pte_t pte_mkclean(pte_t pte) {
|
||||
pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
|
||||
static inline pte_t pte_mkold(pte_t pte) {
|
||||
pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
|
||||
static inline pte_t pte_mkwrite(pte_t pte) {
|
||||
pte_val(pte) |= _PAGE_RW; return pte; }
|
||||
static inline pte_t pte_mkdirty(pte_t pte) {
|
||||
pte_val(pte) |= _PAGE_DIRTY; return pte; }
|
||||
static inline pte_t pte_mkyoung(pte_t pte) {
|
||||
pte_val(pte) |= _PAGE_ACCESSED; return pte; }
|
||||
static inline pte_t pte_mkspecial(pte_t pte) {
|
||||
pte_val(pte) |= _PAGE_SPECIAL; return pte; }
|
||||
static inline pte_t pte_mkhuge(pte_t pte) {
|
||||
return pte; }
|
||||
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
||||
{
|
||||
pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
|
||||
return pte;
|
||||
}
|
||||
|
||||
|
||||
/* Insert a PTE, top-level function is out of line. It uses an inline
|
||||
* low level function in the respective pgtable-* files
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,180 @@
|
|||
/* 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)
|
||||
#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
|
||||
#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC)
|
||||
|
||||
/* 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
|
||||
|
||||
Loading…
Reference in New Issue