624 lines
15 KiB
C
624 lines
15 KiB
C
#ifndef _ASM_X86_PGTABLE_H
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#define _ASM_X86_PGTABLE_H
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#include <asm/page.h>
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#include <asm/e820.h>
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#include <asm/pgtable_types.h>
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/*
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* Macro to mark a page protection value as UC-
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*/
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#define pgprot_noncached(prot) \
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((boot_cpu_data.x86 > 3) \
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? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \
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: (prot))
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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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#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_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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#define pgd_val(x) native_pgd_val(x)
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#define __pgd(x) native_make_pgd(x)
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#ifndef __PAGETABLE_PUD_FOLDED
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#define pud_val(x) native_pud_val(x)
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#define __pud(x) native_make_pud(x)
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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#define pmd_val(x) native_pmd_val(x)
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#define __pmd(x) native_make_pmd(x)
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#endif
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#define pte_val(x) native_pte_val(x)
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#define __pte(x) native_make_pte(x)
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#define arch_end_context_switch(prev) do {} while(0)
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#endif /* CONFIG_PARAVIRT */
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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 pte_flags(pte) & _PAGE_SPECIAL;
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}
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static inline unsigned long pte_pfn(pte_t pte)
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{
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return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
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}
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static inline unsigned long pmd_pfn(pmd_t pmd)
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{
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return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
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}
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#define pte_page(pte) pfn_to_page(pte_pfn(pte))
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static inline int pmd_large(pmd_t pte)
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{
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return (pmd_flags(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_set_flags(pte_t pte, pteval_t set)
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{
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pteval_t v = native_pte_val(pte);
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return native_make_pte(v | set);
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}
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static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
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{
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pteval_t v = native_pte_val(pte);
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return native_make_pte(v & ~clear);
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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_clear_flags(pte, _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_clear_flags(pte, _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_clear_flags(pte, _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_clear_flags(pte, _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_set_flags(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_set_flags(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_set_flags(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_set_flags(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_clear_flags(pte, _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_set_flags(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_clear_flags(pte, _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_set_flags(pte, _PAGE_SPECIAL);
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}
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/*
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* Mask out unsupported bits in a present pgprot. Non-present pgprots
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* can use those bits for other purposes, so leave them be.
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*/
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static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
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{
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pgprotval_t protval = pgprot_val(pgprot);
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if (protval & _PAGE_PRESENT)
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protval &= __supported_pte_mask;
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return protval;
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}
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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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massage_pgprot(pgprot));
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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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massage_pgprot(pgprot));
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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 |= massage_pgprot(newprot) & ~_PAGE_CHG_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_FLAGS_MASK)
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#define canon_pgprot(p) __pgprot(massage_pgprot(p))
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static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
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unsigned long flags,
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unsigned long new_flags)
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{
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/*
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* PAT type is always WB for ISA. So no need to check.
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*/
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if (is_ISA_range(paddr, paddr + size - 1))
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return 1;
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/*
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* Certain new memtypes are not allowed with certain
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* requested memtype:
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* - request is uncached, return cannot be write-back
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* - request is write-combine, return cannot be write-back
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*/
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if ((flags == _PAGE_CACHE_UC_MINUS &&
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new_flags == _PAGE_CACHE_WB) ||
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(flags == _PAGE_CACHE_WC &&
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new_flags == _PAGE_CACHE_WB)) {
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return 0;
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}
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return 1;
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}
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pmd_t *populate_extra_pmd(unsigned long vaddr);
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pte_t *populate_extra_pte(unsigned long vaddr);
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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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#include <linux/mm_types.h>
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static inline int pte_none(pte_t pte)
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{
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return !pte.pte;
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}
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#define __HAVE_ARCH_PTE_SAME
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static inline int pte_same(pte_t a, pte_t b)
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{
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return a.pte == b.pte;
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}
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static inline int pte_present(pte_t a)
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{
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return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
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}
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static inline int pte_hidden(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_HIDDEN;
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}
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static inline int pmd_present(pmd_t pmd)
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{
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return pmd_flags(pmd) & _PAGE_PRESENT;
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}
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static inline int pmd_none(pmd_t pmd)
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{
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/* Only check low word on 32-bit platforms, since it might be
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out of sync with upper half. */
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return (unsigned long)native_pmd_val(pmd) == 0;
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}
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static inline unsigned long pmd_page_vaddr(pmd_t pmd)
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{
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return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
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}
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/*
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* Currently stuck as a macro due to indirect forward reference to
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* linux/mmzone.h's __section_mem_map_addr() definition:
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*/
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#define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
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/*
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* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
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*
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* this macro returns the index of the entry in the pmd page which would
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* control the given virtual address
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*/
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static inline unsigned long pmd_index(unsigned long address)
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{
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return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
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}
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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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* (Currently stuck as a macro because of indirect forward reference
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* to linux/mm.h:page_to_nid())
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*/
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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/*
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* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
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*
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* this function returns the index of the entry in the pte page which would
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* control the given virtual address
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*/
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static inline unsigned long pte_index(unsigned long address)
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{
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return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
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}
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static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
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{
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return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
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}
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static inline int pmd_bad(pmd_t pmd)
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{
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return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
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}
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static inline unsigned long pages_to_mb(unsigned long npg)
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{
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return npg >> (20 - PAGE_SHIFT);
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}
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#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
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remap_pfn_range(vma, vaddr, pfn, size, prot)
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#if PAGETABLE_LEVELS > 2
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static inline int pud_none(pud_t pud)
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{
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return native_pud_val(pud) == 0;
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}
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static inline int pud_present(pud_t pud)
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{
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return pud_flags(pud) & _PAGE_PRESENT;
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}
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static inline unsigned long pud_page_vaddr(pud_t pud)
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{
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return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
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}
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/*
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* Currently stuck as a macro due to indirect forward reference to
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* linux/mmzone.h's __section_mem_map_addr() definition:
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*/
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#define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
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/* Find an entry in the second-level page table.. */
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static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
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{
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return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
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}
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static inline int pud_large(pud_t pud)
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{
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return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
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(_PAGE_PSE | _PAGE_PRESENT);
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}
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static inline int pud_bad(pud_t pud)
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{
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return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
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}
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#else
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static inline int pud_large(pud_t pud)
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{
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return 0;
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}
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#endif /* PAGETABLE_LEVELS > 2 */
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#if PAGETABLE_LEVELS > 3
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static inline int pgd_present(pgd_t pgd)
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{
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return pgd_flags(pgd) & _PAGE_PRESENT;
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}
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static inline unsigned long pgd_page_vaddr(pgd_t pgd)
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{
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return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
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}
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/*
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* Currently stuck as a macro due to indirect forward reference to
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* linux/mmzone.h's __section_mem_map_addr() definition:
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*/
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#define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
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/* to find an entry in a page-table-directory. */
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static inline unsigned long pud_index(unsigned long address)
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{
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return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
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}
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static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
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{
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return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
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}
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static inline int pgd_bad(pgd_t pgd)
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{
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return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
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}
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static inline int pgd_none(pgd_t pgd)
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{
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return !native_pgd_val(pgd);
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}
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#endif /* PAGETABLE_LEVELS > 3 */
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#endif /* __ASSEMBLY__ */
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/*
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* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
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*
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* this macro returns the index of the entry in the pgd page which would
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* control the given virtual address
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*/
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#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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/*
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* pgd_offset() returns a (pgd_t *)
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* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
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*/
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#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
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/*
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* a shortcut which implies the use of the kernel's pgd, instead
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* of a process's
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*/
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#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
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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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extern int direct_gbpages;
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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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/*
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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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struct vm_area_struct;
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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,
|
|
unsigned long address, pte_t *ptep,
|
|
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,
|
|
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,
|
|
unsigned long address, pte_t *ptep);
|
|
|
|
#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)
|
|
{
|
|
pte_t pte = native_ptep_get_and_clear(ptep);
|
|
pte_update(mm, addr, ptep);
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|
return pte;
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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)
|
|
{
|
|
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 {
|
|
pte = ptep_get_and_clear(mm, addr, ptep);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
|
|
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 */
|