365 lines
13 KiB
C
365 lines
13 KiB
C
#ifndef _ASM_X86_PGTABLE_H
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#define _ASM_X86_PGTABLE_H
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#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
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#define FIRST_USER_ADDRESS 0
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#define _PAGE_BIT_PRESENT 0
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#define _PAGE_BIT_RW 1
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#define _PAGE_BIT_USER 2
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#define _PAGE_BIT_PWT 3
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#define _PAGE_BIT_PCD 4
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#define _PAGE_BIT_ACCESSED 5
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#define _PAGE_BIT_DIRTY 6
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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_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_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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#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, 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 | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
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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 | _PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY PAGE_COPY_NOEXEC
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _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_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
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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_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
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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) { 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_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
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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_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; }
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static inline int pte_global(pte_t pte) { return pte_val(pte) & _PAGE_GLOBAL; }
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static inline int pte_exec(pte_t pte) { return !(pte_val(pte) & _PAGE_NX); }
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static inline int pmd_large(pmd_t pte) {
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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) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_DIRTY); }
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static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_ACCESSED); }
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static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_RW); }
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static inline pte_t pte_mkexec(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_NX); }
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static inline pte_t pte_mkdirty(pte_t pte) { return __pte(pte_val(pte) | _PAGE_DIRTY); }
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static inline pte_t pte_mkyoung(pte_t pte) { return __pte(pte_val(pte) | _PAGE_ACCESSED); }
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static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) | _PAGE_RW); }
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static inline pte_t pte_mkhuge(pte_t pte) { return __pte(pte_val(pte) | _PAGE_PSE); }
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static inline pte_t pte_clrhuge(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_PSE); }
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static inline pte_t pte_mkglobal(pte_t pte) { return __pte(pte_val(pte) | _PAGE_GLOBAL); }
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static inline pte_t pte_clrglobal(pte_t pte) { return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL); }
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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 & ~_PAGE_NX;
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val |= pgprot_val(newprot) & __supported_pte_mask;
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return __pte(val);
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}
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#define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))
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#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
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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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#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, 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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#define ptep_set_access_flags(vma, address, ptep, entry, dirty) \
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({ \
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int __changed = !pte_same(*(ptep), entry); \
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if (__changed && dirty) { \
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*ptep = entry; \
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pte_update_defer((vma)->vm_mm, (address), (ptep)); \
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flush_tlb_page(vma, address); \
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} \
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__changed; \
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})
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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#define ptep_test_and_clear_young(vma, addr, ptep) ({ \
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int __ret = 0; \
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if (pte_young(*(ptep))) \
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__ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
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&(ptep)->pte); \
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if (__ret) \
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pte_update((vma)->vm_mm, addr, ptep); \
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__ret; \
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})
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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#define ptep_clear_flush_young(vma, address, ptep) \
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({ \
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int __young; \
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__young = ptep_test_and_clear_young((vma), (address), (ptep)); \
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if (__young) \
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flush_tlb_page(vma, address); \
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__young; \
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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, unsigned long addr, pte_t *ptep, int full)
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{
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pte_t pte;
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if (full) {
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/*
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* Full address destruction in progress; paravirt does not
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* care about updates and native needs no locking
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*/
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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;
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}
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#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)
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{
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clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
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pte_update(mm, addr, ptep);
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}
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#include <asm-generic/pgtable.h>
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_PGTABLE_H */
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