forked from luck/tmp_suning_uos_patched
a15af1c9ea
Add pte_flags() to extract the flags from a pte. This is a special case of pte_val() which is only guaranteed to return the pte's flags correctly; the page number may be corrupted or missing. The intent is to allow paravirt implementations to return pte flags without having to do any translation of the page number (most notably, Xen). Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
491 lines
14 KiB
C
491 lines
14 KiB
C
#ifndef _ASM_X86_PGTABLE_H
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#define _ASM_X86_PGTABLE_H
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#define FIRST_USER_ADDRESS 0
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#define _PAGE_BIT_PRESENT 0 /* is present */
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#define _PAGE_BIT_RW 1 /* writeable */
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#define _PAGE_BIT_USER 2 /* userspace addressable */
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#define _PAGE_BIT_PWT 3 /* page write through */
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#define _PAGE_BIT_PCD 4 /* page cache disabled */
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#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
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#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
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#define _PAGE_BIT_FILE 6
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#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
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#define _PAGE_BIT_PAT 7 /* on 4KB pages */
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#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
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#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
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#define _PAGE_BIT_UNUSED2 10
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#define _PAGE_BIT_UNUSED3 11
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#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
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#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
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/*
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* Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
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* sign-extended value on 32-bit with all 1's in the upper word,
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* which preserves the upper pte values on 64-bit ptes:
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*/
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#define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
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#define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
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#define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
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#define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
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#define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
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#define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
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#define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
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#define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
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#define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
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#define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
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#define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
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#define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
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#define _PAGE_PAT (_AC(1, L)<<_PAGE_BIT_PAT)
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#define _PAGE_PAT_LARGE (_AC(1, L)<<_PAGE_BIT_PAT_LARGE)
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
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#define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
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#else
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#define _PAGE_NX 0
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#endif
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/* If _PAGE_PRESENT is clear, we use these: */
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#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
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* saved PTE; unset:swap */
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#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
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pte_present gives true */
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#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
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_PAGE_DIRTY)
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/* Set of bits not changed in pte_modify */
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#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_PCD | _PAGE_PWT | \
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_PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
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#define _PAGE_CACHE_WB (0)
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#define _PAGE_CACHE_WC (_PAGE_PWT)
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#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
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#define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
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_PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED)
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#define PAGE_COPY PAGE_COPY_NOEXEC
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED)
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#ifdef CONFIG_X86_32
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#define _PAGE_KERNEL_EXEC \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
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#define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
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#ifndef __ASSEMBLY__
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extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
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#endif /* __ASSEMBLY__ */
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#else
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#define __PAGE_KERNEL_EXEC \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
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#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
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#endif
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#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
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#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
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#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
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#define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
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#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
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#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
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#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
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#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
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#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
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#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
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#ifdef CONFIG_X86_32
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# define MAKE_GLOBAL(x) __pgprot((x))
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#else
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# define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
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#endif
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#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
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#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
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#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
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#define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
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#define PAGE_KERNEL_WC MAKE_GLOBAL(__PAGE_KERNEL_WC)
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#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
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#define PAGE_KERNEL_UC_MINUS MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
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#define PAGE_KERNEL_EXEC_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
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#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
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#define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
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#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
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#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
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/* xwr */
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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_EXEC
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#define __P101 PAGE_READONLY_EXEC
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#define __P110 PAGE_COPY_EXEC
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#define __P111 PAGE_COPY_EXEC
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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_EXEC
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#define __S101 PAGE_READONLY_EXEC
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#define __S110 PAGE_SHARED_EXEC
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#define __S111 PAGE_SHARED_EXEC
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#ifndef __ASSEMBLY__
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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extern spinlock_t pgd_lock;
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extern struct list_head pgd_list;
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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_dirty(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_DIRTY;
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}
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static inline int pte_young(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_ACCESSED;
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}
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static inline int pte_write(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_RW;
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}
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static inline int pte_file(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_FILE;
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}
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static inline int pte_huge(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_PSE;
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}
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static inline int pte_global(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_GLOBAL;
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}
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static inline int pte_exec(pte_t pte)
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{
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return !(pte_flags(pte) & _PAGE_NX);
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}
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static inline int pte_special(pte_t pte)
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{
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return 0;
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}
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static inline int pmd_large(pmd_t pte)
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{
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return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
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(_PAGE_PSE | _PAGE_PRESENT);
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY);
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED);
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW);
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}
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static inline pte_t pte_mkexec(pte_t pte)
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{
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return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX);
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_DIRTY);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_ACCESSED);
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_RW);
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}
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static inline pte_t pte_mkhuge(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_PSE);
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}
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static inline pte_t pte_clrhuge(pte_t pte)
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{
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return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE);
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}
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static inline pte_t pte_mkglobal(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_GLOBAL);
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}
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static inline pte_t pte_clrglobal(pte_t pte)
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{
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return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL);
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}
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static inline pte_t pte_mkspecial(pte_t pte)
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{
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return pte;
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}
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extern pteval_t __supported_pte_mask;
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static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
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{
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return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
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pgprot_val(pgprot)) & __supported_pte_mask);
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}
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static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
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{
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return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
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pgprot_val(pgprot)) & __supported_pte_mask);
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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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pteval_t val = pte_val(pte);
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/*
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* Chop off the NX bit (if present), and add the NX portion of
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* the newprot (if present):
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*/
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val &= _PAGE_CHG_MASK;
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val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
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return __pte(val);
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}
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/* mprotect needs to preserve PAT bits when updating vm_page_prot */
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#define pgprot_modify pgprot_modify
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static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
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{
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pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
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pgprotval_t addbits = pgprot_val(newprot);
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return __pgprot(preservebits | addbits);
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}
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#define pte_pgprot(x) __pgprot(pte_flags(x) & ~PTE_MASK)
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#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
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#ifndef __ASSEMBLY__
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#define __HAVE_PHYS_MEM_ACCESS_PROT
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struct file;
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot);
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int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t *vma_prot);
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#endif
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else /* !CONFIG_PARAVIRT */
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#define set_pte(ptep, pte) native_set_pte(ptep, pte)
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#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
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#define set_pte_present(mm, addr, ptep, pte) \
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native_set_pte_present(mm, addr, ptep, pte)
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#define set_pte_atomic(ptep, pte) \
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native_set_pte_atomic(ptep, pte)
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#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
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#ifndef __PAGETABLE_PUD_FOLDED
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#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
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#define pgd_clear(pgd) native_pgd_clear(pgd)
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#endif
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#ifndef set_pud
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# define set_pud(pudp, pud) native_set_pud(pudp, pud)
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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#define pud_clear(pud) native_pud_clear(pud)
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#endif
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#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
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#define pmd_clear(pmd) native_pmd_clear(pmd)
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#define pte_update(mm, addr, ptep) do { } while (0)
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#define pte_update_defer(mm, addr, ptep) do { } while (0)
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#endif /* CONFIG_PARAVIRT */
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#endif /* __ASSEMBLY__ */
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#ifdef CONFIG_X86_32
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# include "pgtable_32.h"
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#else
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# include "pgtable_64.h"
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#endif
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#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
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#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
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#ifndef __ASSEMBLY__
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enum {
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PG_LEVEL_NONE,
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PG_LEVEL_4K,
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PG_LEVEL_2M,
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PG_LEVEL_1G,
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};
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/*
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* Helper function that returns the kernel pagetable entry controlling
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* the virtual address 'address'. NULL means no pagetable entry present.
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* NOTE: the return type is pte_t but if the pmd is PSE then we return it
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* as a pte too.
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*/
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extern pte_t *lookup_address(unsigned long address, unsigned int *level);
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/* local pte updates need not use xchg for locking */
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static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
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{
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pte_t res = *ptep;
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/* Pure native function needs no input for mm, addr */
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native_pte_clear(NULL, 0, ptep);
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return res;
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}
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static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep , pte_t pte)
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{
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native_set_pte(ptep, pte);
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}
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#ifndef CONFIG_PARAVIRT
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/*
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* Rules for using pte_update - it must be called after any PTE update which
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* has not been done using the set_pte / clear_pte interfaces. It is used by
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* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
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* updates should either be sets, clears, or set_pte_atomic for P->P
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* transitions, which means this hook should only be called for user PTEs.
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* This hook implies a P->P protection or access change has taken place, which
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* requires a subsequent TLB flush. The notification can optionally be delayed
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* until the TLB flush event by using the pte_update_defer form of the
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* interface, but care must be taken to assure that the flush happens while
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* still holding the same page table lock so that the shadow and primary pages
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* do not become out of sync on SMP.
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*/
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#define pte_update(mm, addr, ptep) do { } while (0)
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#define pte_update_defer(mm, addr, ptep) do { } while (0)
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#endif
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/*
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* We only update the dirty/accessed state if we set
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* the dirty bit by hand in the kernel, since the hardware
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* will do the accessed bit for us, and we don't want to
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* race with other CPU's that might be updating the dirty
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* bit at the same time.
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*/
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#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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extern int ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep,
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pte_t entry, int dirty);
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep);
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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extern int ptep_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep);
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|
|
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
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|
static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep)
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|
{
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pte_t pte = native_ptep_get_and_clear(ptep);
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|
pte_update(mm, addr, ptep);
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return pte;
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|
}
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|
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
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|
static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
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|
unsigned long addr, pte_t *ptep,
|
|
int full)
|
|
{
|
|
pte_t pte;
|
|
if (full) {
|
|
/*
|
|
* Full address destruction in progress; paravirt does not
|
|
* care about updates and native needs no locking
|
|
*/
|
|
pte = native_local_ptep_get_and_clear(ptep);
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|
} else {
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|
pte = ptep_get_and_clear(mm, addr, ptep);
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|
}
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|
return pte;
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
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|
static inline void ptep_set_wrprotect(struct mm_struct *mm,
|
|
unsigned long addr, pte_t *ptep)
|
|
{
|
|
clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
|
|
pte_update(mm, addr, ptep);
|
|
}
|
|
|
|
/*
|
|
* clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
|
|
*
|
|
* dst - pointer to pgd range anwhere on a pgd page
|
|
* src - ""
|
|
* count - the number of pgds to copy.
|
|
*
|
|
* dst and src can be on the same page, but the range must not overlap,
|
|
* and must not cross a page boundary.
|
|
*/
|
|
static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
|
|
{
|
|
memcpy(dst, src, count * sizeof(pgd_t));
|
|
}
|
|
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_X86_PGTABLE_H */
|