273 lines
6.6 KiB
C
273 lines
6.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_CSKY_PGTABLE_H
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#define __ASM_CSKY_PGTABLE_H
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#include <asm/fixmap.h>
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#include <asm/memory.h>
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#include <asm/addrspace.h>
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#include <abi/pgtable-bits.h>
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#include <asm-generic/pgtable-nopmd.h>
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#define PGDIR_SHIFT 22
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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#define USER_PTRS_PER_PGD (PAGE_OFFSET/PGDIR_SIZE)
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/*
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* C-SKY is two-level paging structure:
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*/
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#define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PTE (PAGE_SIZE / sizeof(pte_t))
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#define pte_ERROR(e) \
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pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
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#define pgd_ERROR(e) \
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pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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#define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
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#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
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#define pte_clear(mm, addr, ptep) set_pte((ptep), \
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(((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
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#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
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#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
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#define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT))
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#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
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| pgprot_val(prot))
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \
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pgprot_val(pgprot))
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/*
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* C-SKY only has VALID and DIRTY bit in hardware. So we need to use the
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* two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED.
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*/
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#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
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#define PAGE_NONE __pgprot(_PAGE_PROT_NONE)
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#define PAGE_READ __pgprot(_PAGE_BASE | _PAGE_READ | \
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_CACHE_CACHED)
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#define PAGE_WRITE __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
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_CACHE_CACHED)
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#define PAGE_SHARED PAGE_WRITE
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#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
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_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
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_PAGE_GLOBAL | \
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_CACHE_CACHED)
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#define _PAGE_IOREMAP (_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
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_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
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_PAGE_GLOBAL | \
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_CACHE_UNCACHED | _PAGE_SO)
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#define _PAGE_CHG_MASK (~(unsigned long) \
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(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
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_CACHE_MASK | _PAGE_GLOBAL))
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#define MAX_SWAPFILES_CHECK() \
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BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
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extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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extern void load_pgd(unsigned long pg_dir);
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extern pte_t invalid_pte_table[PTRS_PER_PTE];
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static inline void set_pte(pte_t *p, pte_t pte)
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{
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*p = pte;
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#if defined(CONFIG_CPU_NEED_TLBSYNC)
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dcache_wb_line((u32)p);
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#endif
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/* prevent out of order excution */
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smp_mb();
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}
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#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
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static inline pte_t *pmd_page_vaddr(pmd_t pmd)
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{
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unsigned long ptr;
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ptr = pmd_val(pmd);
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return __va(ptr);
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}
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#define pmd_phys(pmd) pmd_val(pmd)
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static inline void set_pmd(pmd_t *p, pmd_t pmd)
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{
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*p = pmd;
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#if defined(CONFIG_CPU_NEED_TLBSYNC)
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dcache_wb_line((u32)p);
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#endif
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/* prevent specul excute */
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smp_mb();
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}
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static inline int pmd_none(pmd_t pmd)
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{
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return pmd_val(pmd) == __pa(invalid_pte_table);
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}
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#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
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static inline int pmd_present(pmd_t pmd)
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{
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return (pmd_val(pmd) != __pa(invalid_pte_table));
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}
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static inline void pmd_clear(pmd_t *p)
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{
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pmd_val(*p) = (__pa(invalid_pte_table));
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#if defined(CONFIG_CPU_NEED_TLBSYNC)
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dcache_wb_line((u32)p);
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#endif
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}
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_read(pte_t pte)
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{
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return pte.pte_low & _PAGE_READ;
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}
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static inline int pte_write(pte_t pte)
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{
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return (pte).pte_low & _PAGE_WRITE;
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}
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static inline int pte_dirty(pte_t pte)
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{
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return (pte).pte_low & _PAGE_MODIFIED;
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}
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static inline int pte_young(pte_t pte)
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{
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return (pte).pte_low & _PAGE_ACCESSED;
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
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return pte;
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
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return pte;
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
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return pte;
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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pte_val(pte) |= _PAGE_WRITE;
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if (pte_val(pte) & _PAGE_MODIFIED)
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pte_val(pte) |= _PAGE_DIRTY;
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return pte;
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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pte_val(pte) |= _PAGE_MODIFIED;
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if (pte_val(pte) & _PAGE_WRITE)
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pte_val(pte) |= _PAGE_DIRTY;
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return pte;
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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pte_val(pte) |= _PAGE_ACCESSED;
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if (pte_val(pte) & _PAGE_READ)
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pte_val(pte) |= _PAGE_VALID;
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return pte;
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}
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static inline int pte_swp_exclusive(pte_t pte)
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{
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return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
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}
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static inline pte_t pte_swp_mkexclusive(pte_t pte)
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{
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pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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static inline pte_t pte_swp_clear_exclusive(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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#define __HAVE_PHYS_MEM_ACCESS_PROT
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struct file;
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extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot);
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/*
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* Macro to make mark a page protection value as "uncacheable". Note
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* that "protection" is really a misnomer here as the protection value
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* contains the memory attribute bits, dirty bits, and various other
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* bits as well.
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*/
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#define pgprot_noncached pgprot_noncached
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static inline pgprot_t pgprot_noncached(pgprot_t _prot)
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{
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unsigned long prot = pgprot_val(_prot);
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prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
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return __pgprot(prot);
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}
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#define pgprot_writecombine pgprot_writecombine
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static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
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{
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unsigned long prot = pgprot_val(_prot);
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prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
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return __pgprot(prot);
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}
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
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(pgprot_val(newprot)));
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}
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern void paging_init(void);
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void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
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pte_t *pte);
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#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
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remap_pfn_range(vma, vaddr, pfn, size, prot)
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#endif /* __ASM_CSKY_PGTABLE_H */
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