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https://gitee.com/open-loongarch/linux-5.10.git
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372 lines
8.9 KiB
C
372 lines
8.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_PGTABLE_H
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#define _ASM_PGTABLE_H
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#include <linux/mm_types.h>
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#include <linux/mmzone.h>
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#include <asm/io.h>
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#include <asm/pgtable-bits.h>
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#include <asm/pgtable-64.h>
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struct mm_struct;
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struct vm_area_struct;
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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;
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extern unsigned long zero_page_mask;
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#define ZERO_PAGE(vaddr) \
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(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
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#define __HAVE_COLOR_ZERO_PAGE
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extern void paging_init(void);
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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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#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
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#define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
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#define pmd_page(pmd) __pmd_page(pmd)
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#define pmd_page_vaddr(pmd) pmd_val(pmd)
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static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval);
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#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
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#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
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#define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
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static inline void set_pte(pte_t *ptep, pte_t pteval)
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{
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*ptep = pteval;
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if (pte_val(pteval) & _PAGE_GLOBAL) {
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pte_t *buddy = ptep_buddy(ptep);
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/*
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* Make sure the buddy is global too (if it's !none,
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* it better already be global)
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*/
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#ifdef CONFIG_SMP
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/*
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* For SMP, multiple CPUs can race, so we need to do
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* this atomically.
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*/
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unsigned long page_global = _PAGE_GLOBAL;
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unsigned long tmp;
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__asm__ __volatile__ (
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"1:" __LL "%[tmp], %[buddy] \n"
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" bnez %[tmp], 2f \n"
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" or %[tmp], %[tmp], %[global] \n"
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__SC "%[tmp], %[buddy] \n"
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" beqz %[tmp], 1b \n"
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" nop \n"
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"2: \n"
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__WEAK_LLSC_MB
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: [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
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: [global] "r" (page_global));
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#else /* !CONFIG_SMP */
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if (pte_none(*buddy))
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pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
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#endif /* CONFIG_SMP */
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}
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}
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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/* Preserve global status for the pair */
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if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
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set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
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else
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set_pte_at(mm, addr, ptep, __pte(0));
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}
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static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval)
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{
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extern void __update_cache(unsigned long address, pte_t pte);
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if (!pte_present(pteval))
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goto cache_sync_done;
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if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
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goto cache_sync_done;
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__update_cache(addr, pteval);
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cache_sync_done:
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set_pte(ptep, pteval);
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}
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/*
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* (pmds are folded into puds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while (0)
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#ifndef __PAGETABLE_PMD_FOLDED
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/*
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* (puds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while (0)
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#endif
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#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
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#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
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#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
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extern pgd_t swapper_pg_dir[];
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extern pgd_t invalid_pg_dir[];
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
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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_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
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static inline pte_t pte_mkold(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_ACCESSED;
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return pte;
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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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pte_val(pte) |= _PAGE_ACCESSED;
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return pte;
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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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pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
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return pte;
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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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pte_val(pte) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
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return pte;
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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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pte_val(pte) |= (_PAGE_WRITE | _PAGE_DIRTY);
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return pte;
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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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pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
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return pte;
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}
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static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
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static inline pte_t pte_mkhuge(pte_t pte)
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{
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pte_val(pte) |= _PAGE_HUGE;
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return pte;
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}
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#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
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static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
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static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; }
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#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
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#define pte_accessible pte_accessible
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static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
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{
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if (pte_val(a) & _PAGE_PRESENT)
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return true;
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if ((pte_val(a) & _PAGE_PROTNONE) &&
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mm_tlb_flush_pending(mm))
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return true;
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return false;
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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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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
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(pgprot_val(newprot) & ~_PAGE_CHG_MASK));
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}
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extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
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pte_t *ptep);
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static inline void update_mmu_cache(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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__update_tlb(vma, address, ptep);
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}
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static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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__update_tlb(vma, address, (pte_t *)pmdp);
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}
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#define kern_addr_valid(addr) (1)
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
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#define pmdp_establish generic_pmdp_establish
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static inline int pmd_trans_huge(pmd_t pmd)
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{
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return !!(pmd_val(pmd) & _PAGE_HUGE) && pmd_present(pmd);
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}
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static inline pmd_t pmd_mkhuge(pmd_t pmd)
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{
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pmd_val(pmd) = (pmd_val(pmd) & ~(_PAGE_GLOBAL)) |
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((pmd_val(pmd) & _PAGE_GLOBAL) << (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
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pmd_val(pmd) |= _PAGE_HUGE;
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return pmd;
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}
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extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd);
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#define pmd_write pmd_write
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static inline int pmd_write(pmd_t pmd)
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{
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return !!(pmd_val(pmd) & _PAGE_WRITE);
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}
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static inline pmd_t pmd_mkwrite(pmd_t pmd)
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{
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pmd_val(pmd) |= (_PAGE_WRITE | _PAGE_DIRTY);
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return pmd;
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}
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static inline pmd_t pmd_wrprotect(pmd_t pmd)
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{
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pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
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return pmd;
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}
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static inline int pmd_dirty(pmd_t pmd)
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{
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return !!(pmd_val(pmd) & _PAGE_MODIFIED);
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}
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static inline pmd_t pmd_mkclean(pmd_t pmd)
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{
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pmd_val(pmd) &= ~(_PAGE_DIRTY | _PAGE_MODIFIED);
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return pmd;
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}
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static inline pmd_t pmd_mkdirty(pmd_t pmd)
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{
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pmd_val(pmd) |= (_PAGE_DIRTY | _PAGE_MODIFIED);
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return pmd;
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}
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static inline int pmd_young(pmd_t pmd)
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{
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return !!(pmd_val(pmd) & _PAGE_ACCESSED);
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}
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static inline pmd_t pmd_mkold(pmd_t pmd)
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{
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pmd_val(pmd) &= ~_PAGE_ACCESSED;
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return pmd;
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}
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static inline pmd_t pmd_mkyoung(pmd_t pmd)
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{
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pmd_val(pmd) |= _PAGE_ACCESSED;
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return pmd;
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}
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/* Extern to avoid header file madness */
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extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
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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) & _PFN_MASK) >> _PFN_SHIFT;
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}
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static inline struct page *pmd_page(pmd_t pmd)
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{
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if (pmd_trans_huge(pmd))
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return pfn_to_page(pmd_pfn(pmd));
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return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
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}
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static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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{
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pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) |
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(pgprot_val(newprot) & ~_HPAGE_CHG_MASK);
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return pmd;
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}
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static inline pmd_t pmd_mkinvalid(pmd_t pmd)
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{
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pmd_val(pmd) &= ~(_PAGE_VALID | _PAGE_DIRTY);
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return pmd;
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}
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/*
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* The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
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* different prototype.
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*/
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#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
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static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
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unsigned long address, pmd_t *pmdp)
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{
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pmd_t old = *pmdp;
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pmd_clear(pmdp);
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return old;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#ifdef CONFIG_NUMA_BALANCING
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static inline long pte_protnone(pte_t pte)
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{
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return (pte_val(pte) & _PAGE_PROTNONE);
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}
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static inline long pmd_protnone(pmd_t pmd)
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{
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return (pmd_val(pmd) & _PAGE_PROTNONE);
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}
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#endif /* CONFIG_NUMA_BALANCING */
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/*
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* We provide our own get_unmapped area to cope with the virtual aliasing
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* constraints placed on us by the cache architecture.
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*/
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#define HAVE_ARCH_UNMAPPED_AREA
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#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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#endif /* _ASM_PGTABLE_H */
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