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Diffstat (limited to 'arch/csky/include/asm/pgtable.h')
| -rw-r--r-- | arch/csky/include/asm/pgtable.h | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h new file mode 100644 index 0000000000000..edfcbb25fd9f6 --- /dev/null +++ b/arch/csky/include/asm/pgtable.h @@ -0,0 +1,306 @@ +/* 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&0x80000000)?__pte(1):__pte(0))) +#define pte_none(pte) (!(pte_val(pte)&0xfffffffe)) +#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) + +/* + * 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); + +extern void show_jtlb_table(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 */ |