/* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #ifndef __ASM_CSKY_PGTABLE_H #define __ASM_CSKY_PGTABLE_H #include #include #include #include #include #define PGDIR_SHIFT 22 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) #define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE) #define FIRST_USER_ADDRESS 0UL /* * C-SKY is two-level paging structure: */ #define PGD_ORDER 0 #define PTE_ORDER 0 #define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) #define PTRS_PER_PMD 1 #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) /* Find an entry in the third-level page table.. */ #define __pte_offset_t(address) \ (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) #define pte_offset_kernel(dir, address) \ (pmd_page_vaddr(*(dir)) + __pte_offset_t(address)) #define pte_offset_map(dir, address) \ ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset_t(address)) #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) #define pte_clear(mm, addr, ptep) set_pte((ptep), \ (((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0))) #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) #define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT)) #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \ | pgprot_val(prot)) #define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED) #define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED) #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \ _CACHE_MASK) #define pte_unmap(pte) ((void)(pte)) #define __swp_type(x) (((x).val >> 4) & 0xff) #define __swp_offset(x) ((x).val >> 12) #define __swp_entry(type, offset) ((swp_entry_t) {((type) << 4) | \ ((offset) << 12) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) #define pte_page(x) pfn_to_page(pte_pfn(x)) #define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \ pgprot_val(pgprot)) /* * CSKY can't do page protection for execute, and considers that the same like * read. Also, write permissions imply read permissions. This is the closest * we can get by reasonable means.. */ #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ _CACHE_CACHED) #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED) #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ _PAGE_GLOBAL | _CACHE_CACHED) #define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ _CACHE_CACHED) #define _PAGE_IOREMAP \ (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \ _CACHE_UNCACHED | _PAGE_SO) #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY #define __P011 PAGE_COPY #define __P100 PAGE_READONLY #define __P101 PAGE_READONLY #define __P110 PAGE_COPY #define __P111 PAGE_COPY #define __S000 PAGE_NONE #define __S001 PAGE_READONLY #define __S010 PAGE_SHARED #define __S011 PAGE_SHARED #define __S100 PAGE_READONLY #define __S101 PAGE_READONLY #define __S110 PAGE_SHARED #define __S111 PAGE_SHARED extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) extern void load_pgd(unsigned long pg_dir); extern pte_t invalid_pte_table[PTRS_PER_PTE]; static inline void set_pte(pte_t *p, pte_t pte) { *p = pte; #if defined(CONFIG_CPU_NEED_TLBSYNC) dcache_wb_line((u32)p); #endif /* prevent out of order excution */ smp_mb(); } #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) static inline pte_t *pmd_page_vaddr(pmd_t pmd) { unsigned long ptr; ptr = pmd_val(pmd); return __va(ptr); } #define pmd_phys(pmd) pmd_val(pmd) static inline void set_pmd(pmd_t *p, pmd_t pmd) { *p = pmd; #if defined(CONFIG_CPU_NEED_TLBSYNC) dcache_wb_line((u32)p); #endif /* prevent specul excute */ smp_mb(); } static inline int pmd_none(pmd_t pmd) { return pmd_val(pmd) == __pa(invalid_pte_table); } #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) static inline int pmd_present(pmd_t pmd) { return (pmd_val(pmd) != __pa(invalid_pte_table)); } static inline void pmd_clear(pmd_t *p) { pmd_val(*p) = (__pa(invalid_pte_table)); #if defined(CONFIG_CPU_NEED_TLBSYNC) dcache_wb_line((u32)p); #endif } /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; } static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; } static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; } static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; } static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY); return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID); return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; if (pte_val(pte) & _PAGE_MODIFIED) pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_MODIFIED; if (pte_val(pte) & _PAGE_WRITE) pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; if (pte_val(pte) & _PAGE_READ) pte_val(pte) |= _PAGE_VALID; return pte; } #define __pgd_offset(address) pgd_index(address) #define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) #define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) /* to find an entry in a kernel page-table-directory */ #define pgd_offset_k(address) pgd_offset(&init_mm, address) #define pgd_index(address) ((address) >> PGDIR_SHIFT) #define __HAVE_PHYS_MEM_ACCESS_PROT struct file; extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot); /* * Macro to make mark a page protection value as "uncacheable". Note * that "protection" is really a misnomer here as the protection value * contains the memory attribute bits, dirty bits, and various other * bits as well. */ #define pgprot_noncached pgprot_noncached static inline pgprot_t pgprot_noncached(pgprot_t _prot) { unsigned long prot = pgprot_val(_prot); prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO; return __pgprot(prot); } #define pgprot_writecombine pgprot_writecombine static inline pgprot_t pgprot_writecombine(pgprot_t _prot) { unsigned long prot = pgprot_val(_prot); prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; return __pgprot(prot); } /* * 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, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & _PAGE_CHG_MASK) | (pgprot_val(newprot))); } /* to find an entry in a page-table-directory */ static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address) { return mm->pgd + pgd_index(address); } /* Find an entry in the third-level page table.. */ static inline pte_t *pte_offset(pmd_t *dir, unsigned long address) { return (pte_t *) (pmd_page_vaddr(*dir)) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); } extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern void paging_init(void); void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *pte); /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ #define kern_addr_valid(addr) (1) #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ remap_pfn_range(vma, vaddr, pfn, size, prot) #include #endif /* __ASM_CSKY_PGTABLE_H */