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/* 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 <asm/fixmap.h> #include <asm/addrspace.h> #include <abi/pgtable-bits.h> #include <asm-generic/pgtable-nopmd.h> #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 #define PKMAP_BASE (0xff800000) #define VMALLOC_START (0xc0008000) #define VMALLOC_END (PKMAP_BASE - 2PAGE_SIZE) /* * 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 __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 int pte_special(pte_t pte) { return 0; } static inline pte_t pte_mkspecial(pte_t pte) { return 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 <asm-generic/pgtable.h> #endif / __ASM_CSKY_PGTABLE_H */

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