/* * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved. */ #ifndef _CF_PGTABLE_H #define _CF_PGTABLE_H #include #include #ifndef __ASSEMBLY__ #include #include /* For virtual address to physical address conversion */ #define VTOP(addr) __pa(addr) #define PTOV(addr) __va(addr) #endif /* !__ASSEMBLY__ */ /* Page protection values within PTE. */ /* MMUDR bits, in proper place. */ #define CF_PAGE_LOCKED (0x00000002) #define CF_PAGE_EXEC (0x00000004) #define CF_PAGE_WRITABLE (0x00000008) #define CF_PAGE_READABLE (0x00000010) #define CF_PAGE_SYSTEM (0x00000020) #define CF_PAGE_COPYBACK (0x00000040) #define CF_PAGE_NOCACHE (0x00000080) #define CF_CACHEMASK (~0x00000040) #define CF_PAGE_MMUDR_MASK (0x000000fe) #define _PAGE_NOCACHE030 (CF_PAGE_NOCACHE) /* MMUTR bits, need shifting down. */ #define CF_PAGE_VALID (0x00000400) #define CF_PAGE_SHARED (0x00000800) #define CF_PAGE_MMUTR_MASK (0x00000c00) #define CF_PAGE_MMUTR_SHIFT (10) #define CF_ASID_MMU_SHIFT (2) /* Fake bits, not implemented in CF, will get masked out before hitting hardware, and might go away altogether once this port is complete. */ #if PAGE_SHIFT < 13 #error COLDFIRE Error: Pages must be at least 8k in size #endif #define CF_PAGE_ACCESSED (0x00001000) #define CF_PAGE_FILE (0x00000200) #define CF_PAGE_DIRTY (0x00000001) #define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ #define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ #define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ #define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ #define _DESCTYPE_MASK 0x003 #define _CACHEMASK040 (~0x060) #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ /* Externally used page protection values. */ #define _PAGE_PRESENT (CF_PAGE_VALID) #define _PAGE_ACCESSED (CF_PAGE_ACCESSED) #define _PAGE_DIRTY (CF_PAGE_DIRTY) #define _PAGE_READWRITE (CF_PAGE_WRITABLE \ | CF_PAGE_READABLE \ | CF_PAGE_SHARED \ | CF_PAGE_SYSTEM) /* Compound page protection values. */ #define PAGE_NONE __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED) #define PAGE_SHARED __pgprot(CF_PAGE_VALID \ | CF_PAGE_READABLE \ | CF_PAGE_WRITABLE \ | CF_PAGE_ACCESSED) #define PAGE_INIT __pgprot(CF_PAGE_VALID \ | CF_PAGE_WRITABLE \ | CF_PAGE_READABLE \ | CF_PAGE_EXEC \ | CF_PAGE_SYSTEM \ | CF_PAGE_SHARED) #define PAGE_KERNEL __pgprot(CF_PAGE_VALID \ | CF_PAGE_WRITABLE \ | CF_PAGE_READABLE \ | CF_PAGE_EXEC \ | CF_PAGE_SYSTEM \ | CF_PAGE_SHARED \ | CF_PAGE_ACCESSED) #define PAGE_COPY __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_READABLE) /* * Page protections for initialising protection_map. See mm/mmap.c * for use. In general, the bit positions are xwr, and P-items are * private, the S-items are shared. */ #define __P000 PAGE_NONE #define __P100 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_EXEC) #define __P010 __pgprot(CF_PAGE_VALID \ | CF_PAGE_WRITABLE \ | CF_PAGE_ACCESSED) #define __P110 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_WRITABLE \ | CF_PAGE_EXEC) #define __P001 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_READABLE) #define __P101 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_READABLE \ | CF_PAGE_EXEC) #define __P011 __pgprot(CF_PAGE_VALID \ | CF_PAGE_READABLE \ | CF_PAGE_WRITABLE \ | CF_PAGE_ACCESSED) #define __P111 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_WRITABLE \ | CF_PAGE_READABLE \ | CF_PAGE_EXEC) #define __S000 PAGE_NONE #define __S100 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_EXEC) #define __S010 PAGE_SHARED #define __S110 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_WRITABLE \ | CF_PAGE_EXEC) #define __S001 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_READABLE) #define __S101 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_READABLE \ | CF_PAGE_EXEC) #define __S011 PAGE_SHARED #define __S111 __pgprot(CF_PAGE_VALID \ | CF_PAGE_ACCESSED \ | CF_PAGE_READABLE \ | CF_PAGE_WRITABLE \ | CF_PAGE_EXEC) #define PTE_MASK PAGE_MASK #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY) #ifndef __ASSEMBLY__ /* * 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)) extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } #define pmd_set(pmdp, ptep) do {} while (0) static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) { pgd_val(*pgdp) = virt_to_phys(pmdp); } #define __pte_page(pte) \ ((unsigned long) ((pte_val(pte) & CF_PAGE_PGNUM_MASK) + PAGE_OFFSET)) #define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd))) extern inline int pte_none(pte_t pte) { return !pte_val(pte); } extern inline int pte_present(pte_t pte) { return pte_val(pte) & CF_PAGE_VALID; } extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_val(*ptep) = 0; } #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT) #define pte_page(pte) virt_to_page(__pte_page(pte)) extern inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); } #define pmd_none(pmd) pmd_none2(&(pmd)) extern inline int pmd_bad2(pmd_t *pmd) { return 0; } #define pmd_bad(pmd) pmd_bad2(&(pmd)) #define pmd_present(pmd) (!pmd_none2(&(pmd))) extern inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; } extern inline int pgd_none(pgd_t pgd) { return 0; } extern inline int pgd_bad(pgd_t pgd) { return 0; } extern inline int pgd_present(pgd_t pgd) { return 1; } extern inline void pgd_clear(pgd_t *pgdp) {} #define pte_ERROR(e) \ printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \ __FILE__, __LINE__, pte_val(e)) #define pmd_ERROR(e) \ printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \ __FILE__, __LINE__, pmd_val(e)) #define pgd_ERROR(e) \ printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \ __FILE__, __LINE__, pgd_val(e)) /* * The following only work if pte_present() is true. * Undefined behaviour if not... * [we have the full set here even if they don't change from m68k] */ extern inline int pte_read(pte_t pte) \ { return pte_val(pte) & CF_PAGE_READABLE; } extern inline int pte_write(pte_t pte) \ { return pte_val(pte) & CF_PAGE_WRITABLE; } extern inline int pte_exec(pte_t pte) \ { return pte_val(pte) & CF_PAGE_EXEC; } extern inline int pte_dirty(pte_t pte) \ { return pte_val(pte) & CF_PAGE_DIRTY; } extern inline int pte_young(pte_t pte) \ { return pte_val(pte) & CF_PAGE_ACCESSED; } extern inline int pte_file(pte_t pte) \ { return pte_val(pte) & CF_PAGE_FILE; } static inline int pte_special(pte_t pte) { return 0; } extern inline pte_t pte_wrprotect(pte_t pte) \ { pte_val(pte) &= ~CF_PAGE_WRITABLE; return pte; } extern inline pte_t pte_rdprotect(pte_t pte) \ { pte_val(pte) &= ~CF_PAGE_READABLE; return pte; } extern inline pte_t pte_exprotect(pte_t pte) \ { pte_val(pte) &= ~CF_PAGE_EXEC; return pte; } extern inline pte_t pte_mkclean(pte_t pte) \ { pte_val(pte) &= ~CF_PAGE_DIRTY; return pte; } extern inline pte_t pte_mkold(pte_t pte) \ { pte_val(pte) &= ~CF_PAGE_ACCESSED; return pte; } extern inline pte_t pte_mkwrite(pte_t pte) \ { pte_val(pte) |= CF_PAGE_WRITABLE; return pte; } extern inline pte_t pte_mkread(pte_t pte) \ { pte_val(pte) |= CF_PAGE_READABLE; return pte; } extern inline pte_t pte_mkexec(pte_t pte) \ { pte_val(pte) |= CF_PAGE_EXEC; return pte; } extern inline pte_t pte_mkdirty(pte_t pte) \ { pte_val(pte) |= CF_PAGE_DIRTY; return pte; } extern inline pte_t pte_mkyoung(pte_t pte) \ { pte_val(pte) |= CF_PAGE_ACCESSED; return pte; } extern inline pte_t pte_mknocache(pte_t pte) \ { pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40); return pte; } extern inline pte_t pte_mkcache(pte_t pte) \ { pte_val(pte) &= ~CF_PAGE_NOCACHE; return pte; } static inline pte_t pte_mkspecial(pte_t pte) { return pte; } #define swapper_pg_dir kernel_pg_dir extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; /* Find an entry in a pagetable directory. */ #define pgd_index(address) ((address) >> PGDIR_SHIFT) #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) /* Find an entry in a kernel pagetable directory. */ #define pgd_offset_k(address) pgd_offset(&init_mm, address) /* Find an entry in the second-level pagetable. */ extern inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address) { return (pmd_t *) pgd; } /* Find an entry in the third-level pagetable. */ #define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) #define pte_offset_kernel(dir, address) ((pte_t *) __pmd_page(*(dir)) + \ __pte_offset(address)) /* Disable caching for page at given kernel virtual address. */ static inline void nocache_page(void *vaddr) { pgd_t *dir; pmd_t *pmdp; pte_t *ptep; unsigned long addr = (unsigned long)vaddr; dir = pgd_offset_k(addr); pmdp = pmd_offset(dir, addr); ptep = pte_offset_kernel(pmdp, addr); *ptep = pte_mknocache(*ptep); } /* Enable caching for page at given kernel virtual address. */ static inline void cache_page(void *vaddr) { pgd_t *dir; pmd_t *pmdp; pte_t *ptep; unsigned long addr = (unsigned long)vaddr; dir = pgd_offset_k(addr); pmdp = pmd_offset(dir, addr); ptep = pte_offset_kernel(pmdp, addr); *ptep = pte_mkcache(*ptep); } #define PTE_FILE_MAX_BITS 21 #define PTE_FILE_SHIFT 11 static inline unsigned long pte_to_pgoff(pte_t pte) { return pte_val(pte) >> PTE_FILE_SHIFT; } static inline pte_t pgoff_to_pte(unsigned pgoff) { pte_t pte = __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE); return pte; } /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ #define __swp_entry(type, offset) ((swp_entry_t) { (type) | \ (offset << PTE_FILE_SHIFT) }) #define __swp_type(x) ((x).val & 0xFF) #define __swp_offset(x) ((x).val >> PTE_FILE_SHIFT) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) (__pte((x).val)) #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) #define pte_offset_map(pmdp, address) ((pte_t *)__pmd_page(*pmdp) + \ __pte_offset(address)) #define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address) #define pte_unmap(pte) kunmap(pte) #define pte_unmap_nested(pte) kunmap(pte) #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) #endif /* !__ASSEMBLY__ */ #endif /* !_CF_PGTABLE_H */