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Diffstat (limited to 'include/asm-m68k/motorola_pgtable.h')
| -rw-r--r-- | include/asm-m68k/motorola_pgtable.h | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/include/asm-m68k/motorola_pgtable.h b/include/asm-m68k/motorola_pgtable.h new file mode 100644 index 00000000000..1628723458f --- /dev/null +++ b/include/asm-m68k/motorola_pgtable.h @@ -0,0 +1,294 @@ +#ifndef _MOTOROLA_PGTABLE_H +#define _MOTOROLA_PGTABLE_H + +#include <linux/config.h> + +/* + * Definitions for MMU descriptors + */ +#define _PAGE_PRESENT 0x001 +#define _PAGE_SHORT 0x002 +#define _PAGE_RONLY 0x004 +#define _PAGE_ACCESSED 0x008 +#define _PAGE_DIRTY 0x010 +#define _PAGE_SUPER 0x080 /* 68040 supervisor only */ +#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ +#define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */ +#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */ +#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */ +#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */ +#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */ + +#define _DESCTYPE_MASK 0x003 + +#define _CACHEMASK040 (~0x060) +#define _TABLE_MASK (0xfffffe00) + +#define _PAGE_TABLE (_PAGE_SHORT) +#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE) + +#define _PAGE_PROTNONE 0x004 +#define _PAGE_FILE 0x008 /* pagecache or swap? */ + +#ifndef __ASSEMBLY__ + +/* This is the cache mode to be used for pages containing page descriptors for + * processors >= '040. It is in pte_mknocache(), and the variable is defined + * and initialized in head.S */ +extern int m68k_pgtable_cachemode; + +/* This is the cache mode for normal pages, for supervisor access on + * processors >= '040. It is used in pte_mkcache(), and the variable is + * defined and initialized in head.S */ + +#if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH) +#define m68k_supervisor_cachemode _PAGE_CACHE040W +#elif defined(CPU_M68040_OR_M68060_ONLY) +#define m68k_supervisor_cachemode _PAGE_CACHE040 +#elif defined(CPU_M68020_OR_M68030_ONLY) +#define m68k_supervisor_cachemode 0 +#else +extern int m68k_supervisor_cachemode; +#endif + +#if defined(CPU_M68040_OR_M68060_ONLY) +#define mm_cachebits _PAGE_CACHE040 +#elif defined(CPU_M68020_OR_M68030_ONLY) +#define mm_cachebits 0 +#else +extern unsigned long mm_cachebits; +#endif + +#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits) +#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits) +#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits) +#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits) + +/* Alternate definitions that are compile time constants, for + initializing protection_map. The cachebits are fixed later. */ +#define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) +#define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED) +#define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) +#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED) + +/* + * The m68k can't do page protection for execute, and considers that the same are read. + * Also, write permissions imply read permissions. This is the closest we can get.. + */ +#define __P000 PAGE_NONE_C +#define __P001 PAGE_READONLY_C +#define __P010 PAGE_COPY_C +#define __P011 PAGE_COPY_C +#define __P100 PAGE_READONLY_C +#define __P101 PAGE_READONLY_C +#define __P110 PAGE_COPY_C +#define __P111 PAGE_COPY_C + +#define __S000 PAGE_NONE_C +#define __S001 PAGE_READONLY_C +#define __S010 PAGE_SHARED_C +#define __S011 PAGE_SHARED_C +#define __S100 PAGE_READONLY_C +#define __S101 PAGE_READONLY_C +#define __S110 PAGE_SHARED_C +#define __S111 PAGE_SHARED_C + +/* + * 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) +{ + pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); + return pte; +} + +static inline void pmd_set(pmd_t *pmdp, pte_t *ptep) +{ + unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED; + unsigned long *ptr = pmdp->pmd; + short i = 16; + while (--i >= 0) { + *ptr++ = ptbl; + ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16); + } +} + +static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) +{ + pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp); +} + +#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK)) +#define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK)) +#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK)) + + +#define pte_none(pte) (!pte_val(pte)) +#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) +#define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; }) + +#define pte_page(pte) (mem_map + ((unsigned long)(__va(pte_val(pte)) - PAGE_OFFSET) >> PAGE_SHIFT)) +#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) +#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) + +#define pmd_none(pmd) (!pmd_val(pmd)) +#define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE) +#define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE) +#define pmd_clear(pmdp) ({ \ + unsigned long *__ptr = pmdp->pmd; \ + short __i = 16; \ + while (--__i >= 0) \ + *__ptr++ = 0; \ +}) +#define pmd_page(pmd) (mem_map + ((unsigned long)(__va(pmd_val(pmd)) - PAGE_OFFSET) >> PAGE_SHIFT)) + + +#define pgd_none(pgd) (!pgd_val(pgd)) +#define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE) +#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE) +#define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; }) + +#define pte_ERROR(e) \ + printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) +#define pmd_ERROR(e) \ + printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) +#define pgd_ERROR(e) \ + printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) + + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +static inline int pte_read(pte_t pte) { return 1; } +static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); } +static inline int pte_exec(pte_t pte) { return 1; } +static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } +static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } +static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } + +static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } +static inline pte_t pte_rdprotect(pte_t pte) { return pte; } +static inline pte_t pte_exprotect(pte_t pte) { return pte; } +static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } +static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } +static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; } +static inline pte_t pte_mkread(pte_t pte) { return pte; } +static inline pte_t pte_mkexec(pte_t pte) { return pte; } +static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } +static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } +static inline pte_t pte_mknocache(pte_t pte) +{ + pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode; + return pte; +} +static inline pte_t pte_mkcache(pte_t pte) +{ + pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; + return pte; +} + +#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) + +#define pgd_index(address) ((address) >> PGDIR_SHIFT) + +/* 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); +} + +#define swapper_pg_dir kernel_pg_dir +extern pgd_t kernel_pg_dir[128]; + +static inline pgd_t *pgd_offset_k(unsigned long address) +{ + return kernel_pg_dir + (address >> PGDIR_SHIFT); +} + + +/* Find an entry in the second-level page table.. */ +static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address) +{ + return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1)); +} + +/* Find an entry in the third-level page table.. */ +static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address) +{ + return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); +} + +#define pte_offset_map(pmdp,address) ((pte_t *)kmap(pmd_page(*pmdp)) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) +#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) + +/* + * Allocate and free page tables. The xxx_kernel() versions are + * used to allocate a kernel page table - this turns on ASN bits + * if any. + */ + +/* Prior to calling these routines, the page should have been flushed + * from both the cache and ATC, or the CPU might not notice that the + * cache setting for the page has been changed. -jskov + */ +static inline void nocache_page(void *vaddr) +{ + unsigned long addr = (unsigned long)vaddr; + + if (CPU_IS_040_OR_060) { + pgd_t *dir; + pmd_t *pmdp; + pte_t *ptep; + + dir = pgd_offset_k(addr); + pmdp = pmd_offset(dir, addr); + ptep = pte_offset_kernel(pmdp, addr); + *ptep = pte_mknocache(*ptep); + } +} + +static inline void cache_page(void *vaddr) +{ + unsigned long addr = (unsigned long)vaddr; + + if (CPU_IS_040_OR_060) { + pgd_t *dir; + pmd_t *pmdp; + pte_t *ptep; + + 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 28 + +static inline unsigned long pte_to_pgoff(pte_t pte) +{ + return pte.pte >> 4; +} + +static inline pte_t pgoff_to_pte(unsigned off) +{ + pte_t pte = { (off << 4) + _PAGE_FILE }; + return pte; +} + +/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ +#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 }) + +#endif /* !__ASSEMBLY__ */ +#endif /* _MOTOROLA_PGTABLE_H */ |