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linux-headers-5.4.0-113-generic
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pgtable.h
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/* * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2009 Wind River Systems Inc * * Based on asm/pgtable-32.h from mips which is: * * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef _ASM_NIOS2_PGTABLE_H #define _ASM_NIOS2_PGTABLE_H #include <linux/io.h> #include <linux/bug.h> #include <asm/page.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> #include <asm/pgtable-bits.h> #define __ARCH_USE_5LEVEL_HACK #include <asm-generic/pgtable-nopmd.h> #define FIRST_USER_ADDRESS 0UL #define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE #define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1) struct mm_struct; /* Helper macro */ #define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \ ((x) ? _PAGE_EXEC : 0) | \ ((r) ? _PAGE_READ : 0) | \ ((w) ? _PAGE_WRITE : 0)) /* * These are the macros that generic kernel code needs * (to populate protection_map[]) */ /* Remove W bit on private pages for COW support */ #define __P000 MKP(0, 0, 0) #define __P001 MKP(0, 0, 1) #define __P010 MKP(0, 0, 0) /* COW */ #define __P011 MKP(0, 0, 1) /* COW */ #define __P100 MKP(1, 0, 0) #define __P101 MKP(1, 0, 1) #define __P110 MKP(1, 0, 0) /* COW */ #define __P111 MKP(1, 0, 1) /* COW */ /* Shared pages can have exact HW mapping */ #define __S000 MKP(0, 0, 0) #define __S001 MKP(0, 0, 1) #define __S010 MKP(0, 1, 0) #define __S011 MKP(0, 1, 1) #define __S100 MKP(1, 0, 0) #define __S101 MKP(1, 0, 1) #define __S110 MKP(1, 1, 0) #define __S111 MKP(1, 1, 1) /* Used all over the kernel */ #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ _PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ _PAGE_WRITE | _PAGE_ACCESSED) #define PAGE_COPY MKP(0, 0, 1) #define PGD_ORDER 0 #define PTE_ORDER 0 #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) #define USER_PTRS_PER_PGD \ (CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE) #define PGDIR_SHIFT 22 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)]; /* * (pmds are folded into puds so this doesn't get actually called, * but the define is needed for a generic inline function.) */ static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval) { pmdptr->pud.pgd.pgd = pmdval.pud.pgd.pgd; } /* to find an entry in a page-table-directory */ #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) static inline int pte_write(pte_t pte) \ { return pte_val(pte) & _PAGE_WRITE; } static inline int pte_dirty(pte_t pte) \ { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) \ { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_special(pte_t pte) { return 0; } #define pgprot_noncached pgprot_noncached static inline pgprot_t pgprot_noncached(pgprot_t _prot) { unsigned long prot = pgprot_val(_prot); prot &= ~_PAGE_CACHED; return __pgprot(prot); } static inline int pte_none(pte_t pte) { return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf)); } static inline int pte_present(pte_t pte) \ { return pte_val(pte) & _PAGE_PRESENT; } /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkspecial(pte_t pte) { return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC; pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); return pte; } static inline int pmd_present(pmd_t pmd) { return (pmd_val(pmd) != (unsigned long) invalid_pte_table) && (pmd_val(pmd) != 0UL); } static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = (unsigned long) invalid_pte_table; } #define pte_pfn(pte) (pte_val(pte) & 0xfffff) #define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot))) #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) /* * Store a linux PTE into the linux page table. */ static inline void set_pte(pte_t *ptep, pte_t pteval) { *ptep = pteval; } static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval) { unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval)); flush_dcache_range(paddr, paddr + PAGE_SIZE); set_pte(ptep, pteval); } static inline int pmd_none(pmd_t pmd) { return (pmd_val(pmd) == (unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL); } #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_t null; pte_val(null) = (addr >> PAGE_SHIFT) & 0xf; set_pte_at(mm, addr, ptep, null); } /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ #define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot)) #define pte_unmap(pte) do { } while (0) /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) #define pmd_page_vaddr(pmd) pmd_val(pmd) #define pte_offset_map(dir, addr) \ ((pte_t *) page_address(pmd_page(*dir)) + \ (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) /* to find an entry in a kernel page-table-directory */ #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) /* Get the address to the PTE for a vaddr in specific directory */ #define pte_offset_kernel(dir, addr) \ ((pte_t *) pmd_page_vaddr(*(dir)) + \ (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %08lx.\n", \ __FILE__, __LINE__, pte_val(e)) #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %08lx.\n", \ __FILE__, __LINE__, pgd_val(e)) /* * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte): * * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0 * 0 0 0 0 type. 0 0 0 0 0 0 offset......... * * This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file. * * Note that the offset field is always non-zero, thus !pte_none(pte) is always * true. */ #define __swp_type(swp) (((swp).val >> 26) & 0x3) #define __swp_offset(swp) ((swp).val & 0xfffff) #define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \ | ((off) & 0xfffff) }) #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define kern_addr_valid(addr) (1) #include <asm-generic/pgtable.h> extern void __init paging_init(void); extern void __init mmu_init(void); extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *pte); #endif /* _ASM_NIOS2_PGTABLE_H */