| /* 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 - 2*PAGE_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; |
| |
| 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) |
| |
| /* |
| * No page table caches to initialise |
| */ |
| #define pgtable_cache_init() do {} while (0) |
| |
| #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 */ |