/* * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2003 Ralf Baechle */#ifndef _ASM_PGTABLE_H#define _ASM_PGTABLE_H #ifdef CONFIG_32BIT#include <asm/pgtable-32.h>#endif#ifdef CONFIG_64BIT#include <asm/pgtable-64.h>#endif #include <asm/io.h>#include <asm/pgtable-bits.h> struct mm_struct;struct vm_area_struct; #define PAGE_NONE	__pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \				 _page_cachable_default)#define PAGE_COPY	__pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \				 (kernel_uses_smartmips_rixi ?  _PAGE_NO_EXEC : 0) | _page_cachable_default)#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \				 _page_cachable_default)#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \				 _PAGE_GLOBAL | _page_cachable_default)#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \				 _page_cachable_default)#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) /* * If _PAGE_NO_EXEC is not defined, we can't do page protection for * execute, and consider it to be the same as read. Also, write * permissions imply read permissions. This is the closest we can get * by reasonable means.. */ /* * Dummy values to fill the table in mmap.c * The real values will be generated at runtime */#define __P000 __pgprot(0)#define __P001 __pgprot(0)#define __P010 __pgprot(0)#define __P011 __pgprot(0)#define __P100 __pgprot(0)#define __P101 __pgprot(0)#define __P110 __pgprot(0)#define __P111 __pgprot(0) #define __S000 __pgprot(0)#define __S001 __pgprot(0)#define __S010 __pgprot(0)#define __S011 __pgprot(0)#define __S100 __pgprot(0)#define __S101 __pgprot(0)#define __S110 __pgprot(0)#define __S111 __pgprot(0) extern unsigned long _page_cachable_default; /* * ZERO_PAGE is a global shared page that is always zero; used * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page;extern unsigned long zero_page_mask; #define ZERO_PAGE(vaddr) \	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) #define is_zero_pfn is_zero_pfnstatic inline int is_zero_pfn(unsigned long pfn){	extern unsigned long zero_pfn;	unsigned long offset_from_zero_pfn = pfn - zero_pfn;	return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);} #define my_zero_pfn(addr)	page_to_pfn(ZERO_PAGE(addr)) extern void paging_init(void); /* * 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 pmd_phys(pmd)		virt_to_phys((void *)pmd_val(pmd))#define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))#define pmd_page_vaddr(pmd)	pmd_val(pmd) #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) #define pte_none(pte)		(!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))#define pte_present(pte)	((pte).pte_low & _PAGE_PRESENT) static inline void set_pte(pte_t *ptep, pte_t pte){	ptep->pte_high = pte.pte_high;	smp_wmb();	ptep->pte_low = pte.pte_low;	//printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); 	if (pte.pte_low & _PAGE_GLOBAL) {		pte_t *buddy = ptep_buddy(ptep);		/*		 * Make sure the buddy is global too (if it's !none,		 * it better already be global)		 */		if (pte_none(*buddy)) {			buddy->pte_low  |= _PAGE_GLOBAL;			buddy->pte_high |= _PAGE_GLOBAL;		}	}}#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep){	pte_t null = __pte(0); 	/* Preserve global status for the pair */	if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)		null.pte_low = null.pte_high = _PAGE_GLOBAL; 	set_pte_at(mm, addr, ptep, null);}#else #define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT) /* * Certain architectures need to do special things when pte's * within a page table are directly modified.  Thus, the following * hook is made available. */static inline void set_pte(pte_t *ptep, pte_t pteval){	*ptep = pteval;#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)	if (pte_val(pteval) & _PAGE_GLOBAL) {		pte_t *buddy = ptep_buddy(ptep);		/*		 * Make sure the buddy is global too (if it's !none,		 * it better already be global)		 */		if (pte_none(*buddy))			pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;	}#endif}#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep){#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)	/* Preserve global status for the pair */	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)		set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));	else#endif		set_pte_at(mm, addr, ptep, __pte(0));}#endif /* * (pmds are folded into puds so this doesn't get actually called, * but the define is needed for a generic inline function.) */#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) #ifndef __PAGETABLE_PMD_FOLDED/* * (puds are folded into pgds so this doesn't get actually called, * but the define is needed for a generic inline function.) */#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)#endif #define PGD_T_LOG2	(__builtin_ffs(sizeof(pgd_t)) - 1)#define PMD_T_LOG2	(__builtin_ffs(sizeof(pmd_t)) - 1)#define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1) /* * We used to declare this array with size but gcc 3.3 and older are not able * to find that this expression is a constant, so the size is dropped. */extern pgd_t swapper_pg_dir[]; /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)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 int pte_file(pte_t pte)	{ return pte.pte_low & _PAGE_FILE; } static inline pte_t pte_wrprotect(pte_t pte){	pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);	pte.pte_high &= ~_PAGE_SILENT_WRITE;	return pte;} static inline pte_t pte_mkclean(pte_t pte){	pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);	pte.pte_high &= ~_PAGE_SILENT_WRITE;	return pte;} static inline pte_t pte_mkold(pte_t pte){	pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);	pte.pte_high &= ~_PAGE_SILENT_READ;	return pte;} static inline pte_t pte_mkwrite(pte_t pte){	pte.pte_low |= _PAGE_WRITE;	if (pte.pte_low & _PAGE_MODIFIED) {		pte.pte_low  |= _PAGE_SILENT_WRITE;		pte.pte_high |= _PAGE_SILENT_WRITE;	}	return pte;} static inline pte_t pte_mkdirty(pte_t pte){	pte.pte_low |= _PAGE_MODIFIED;	if (pte.pte_low & _PAGE_WRITE) {		pte.pte_low  |= _PAGE_SILENT_WRITE;		pte.pte_high |= _PAGE_SILENT_WRITE;	}	return pte;} static inline pte_t pte_mkyoung(pte_t pte){	pte.pte_low |= _PAGE_ACCESSED;	if (pte.pte_low & _PAGE_READ) {		pte.pte_low  |= _PAGE_SILENT_READ;		pte.pte_high |= _PAGE_SILENT_READ;	}	return pte;}#elsestatic inline int pte_write(pte_t pte)	{ return pte_val(pte) & _PAGE_WRITE; }static inline int pte_dirty(pte_t pte)	{ return pte_val(pte) & _PAGE_MODIFIED; }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_WRITE | _PAGE_SILENT_WRITE);	return pte;} static inline pte_t pte_mkclean(pte_t pte){	pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);	return pte;} static inline pte_t pte_mkold(pte_t pte){	pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);	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_SILENT_WRITE;	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_SILENT_WRITE;	return pte;} static inline pte_t pte_mkyoung(pte_t pte){	pte_val(pte) |= _PAGE_ACCESSED;	if (kernel_uses_smartmips_rixi) {		if (!(pte_val(pte) & _PAGE_NO_READ))			pte_val(pte) |= _PAGE_SILENT_READ;	} else {		if (pte_val(pte) & _PAGE_READ)			pte_val(pte) |= _PAGE_SILENT_READ;	}	return pte;} #ifdef _PAGE_HUGEstatic inline int pte_huge(pte_t pte)	{ return pte_val(pte) & _PAGE_HUGE; } static inline pte_t pte_mkhuge(pte_t pte){	pte_val(pte) |= _PAGE_HUGE;	return pte;}#endif /* _PAGE_HUGE */#endifstatic inline int pte_special(pte_t pte)	{ return 0; }static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; } /* * 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)) #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)static inline pte_t pte_modify(pte_t pte, pgprot_t newprot){	pte.pte_low  &= _PAGE_CHG_MASK;	pte.pte_high &= ~0x3f;	pte.pte_low  |= pgprot_val(newprot);	pte.pte_high |= pgprot_val(newprot) & 0x3f;	return pte;}#elsestatic inline pte_t pte_modify(pte_t pte, pgprot_t newprot){	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));}#endif  extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,	pte_t pte);extern void __update_cache(struct vm_area_struct *vma, unsigned long address,	pte_t pte); static inline void update_mmu_cache(struct vm_area_struct *vma,	unsigned long address, pte_t *ptep){	pte_t pte = *ptep;	__update_tlb(vma, address, pte);	__update_cache(vma, address, pte);} #define kern_addr_valid(addr)	(1) #ifdef CONFIG_64BIT_PHYS_ADDRextern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); static inline int io_remap_pfn_range(struct vm_area_struct *vma,		unsigned long vaddr,		unsigned long pfn,		unsigned long size,		pgprot_t prot){	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);}#else#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\		remap_pfn_range(vma, vaddr, pfn, size, prot)#endif #include <asm-generic/pgtable.h> /* * uncached accelerated TLB map for video memory access */#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED#define __HAVE_PHYS_MEM_ACCESS_PROT struct file;pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,		unsigned long size, pgprot_t vma_prot);int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,		unsigned long size, pgprot_t *vma_prot);#endif /* * We provide our own get_unmapped area to cope with the virtual aliasing * constraints placed on us by the cache architecture. */#define HAVE_ARCH_UNMAPPED_AREA#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN /* * No page table caches to initialise */#define pgtable_cache_init()	do { } while (0) #endif /* _ASM_PGTABLE_H */