/* * 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 #include <linux/mm_types.h>#include <linux/mmzone.h>#ifdef CONFIG_32BIT#include <asm/pgtable-32.h>#endif#ifdef CONFIG_64BIT#include <asm/pgtable-64.h>#endif #include <asm/cmpxchg.h>#include <asm/io.h>#include <asm/pgtable-bits.h>#include <asm/cpu-features.h> struct mm_struct;struct vm_area_struct; #define PAGE_SHARED	vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED) #define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \				 _PAGE_GLOBAL | _page_cachable_default)#define PAGE_KERNEL_NC	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \				 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)#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.. */ extern unsigned long _page_cachable_default;extern void __update_cache(unsigned long address, pte_t pte); /* * 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 __HAVE_COLOR_ZERO_PAGE extern void pagetable_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)) static inline unsigned long pmd_pfn(pmd_t pmd){	return pmd_val(pmd) >> PFN_PTE_SHIFT;} #ifndef CONFIG_MIPS_HUGE_TLB_SUPPORT#define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ #define pmd_page_vaddr(pmd)	pmd_val(pmd) #define htw_stop()							\do {									\	unsigned long __flags;						\									\	if (cpu_has_htw) {						\		local_irq_save(__flags);				\		if(!raw_current_cpu_data.htw_seq++) {			\			write_c0_pwctl(read_c0_pwctl() &		\				       ~(1 << MIPS_PWCTL_PWEN_SHIFT));	\			back_to_back_c0_hazard();			\		}							\		local_irq_restore(__flags);				\	}								\} while(0) #define htw_start()							\do {									\	unsigned long __flags;						\									\	if (cpu_has_htw) {						\		local_irq_save(__flags);				\		if (!--raw_current_cpu_data.htw_seq) {			\			write_c0_pwctl(read_c0_pwctl() |		\				       (1 << MIPS_PWCTL_PWEN_SHIFT));	\			back_to_back_c0_hazard();			\		}							\		local_irq_restore(__flags);				\	}								\} while(0) #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) #ifdef CONFIG_XPA# define pte_none(pte)		(!(((pte).pte_high) & ~_PAGE_GLOBAL))#else# define pte_none(pte)		(!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))#endif #define pte_present(pte)	((pte).pte_low & _PAGE_PRESENT)#define pte_no_exec(pte)	((pte).pte_low & _PAGE_NO_EXEC) 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; #ifdef CONFIG_XPA	if (pte.pte_high & _PAGE_GLOBAL) {#else	if (pte.pte_low & _PAGE_GLOBAL) {#endif		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)) {			if (!IS_ENABLED(CONFIG_XPA))				buddy->pte_low |= _PAGE_GLOBAL;			buddy->pte_high |= _PAGE_GLOBAL;		}	}} static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep){	pte_t null = __pte(0); 	htw_stop();	/* Preserve global status for the pair */	if (IS_ENABLED(CONFIG_XPA)) {		if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)			null.pte_high = _PAGE_GLOBAL;	} else {		if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)			null.pte_low = null.pte_high = _PAGE_GLOBAL;	} 	set_pte(ptep, null);	htw_start();}#else #define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)#define pte_no_exec(pte)	(pte_val(pte) & _PAGE_NO_EXEC) /* * 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_R3K_TLB)	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 defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)		cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);# else		cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);# endif	}#endif} static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep){	htw_stop();#if !defined(CONFIG_CPU_R3K_TLB)	/* Preserve global status for the pair */	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)		set_pte(ptep, __pte(_PAGE_GLOBAL));	else#endif		set_pte(ptep, __pte(0));	htw_start();}#endif static inline void set_ptes(struct mm_struct *mm, unsigned long addr,		pte_t *ptep, pte_t pte, unsigned int nr){	unsigned int i;	bool do_sync = false; 	for (i = 0; i < nr; i++) {		if (!pte_present(pte))			continue;		if (pte_present(ptep[i]) &&		    (pte_pfn(ptep[i]) == pte_pfn(pte)))			continue;		do_sync = true;	} 	if (do_sync)		__update_cache(addr, pte); 	for (;;) {		set_pte(ptep, pte);		if (--nr == 0)			break;		ptep++;		pte = __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));	}}#define set_ptes set_ptes /* * (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[]; /* * Platform specific pte_special() and pte_mkspecial() definitions * are required only when ARCH_HAS_PTE_SPECIAL is enabled. */#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)static inline int pte_special(pte_t pte){	return pte.pte_low & _PAGE_SPECIAL;} static inline pte_t pte_mkspecial(pte_t pte){	pte.pte_low |= _PAGE_SPECIAL;	return pte;}#elsestatic inline int pte_special(pte_t pte){	return pte_val(pte) & _PAGE_SPECIAL;} static inline pte_t pte_mkspecial(pte_t pte){	pte_val(pte) |= _PAGE_SPECIAL;	return pte;}#endif#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */#if defined(CONFIG_PHYS_ADDR_T_64BIT) && 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 pte_t pte_wrprotect(pte_t pte){	pte.pte_low  &= ~_PAGE_WRITE;	if (!IS_ENABLED(CONFIG_XPA))		pte.pte_low &= ~_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;	if (!IS_ENABLED(CONFIG_XPA))		pte.pte_low &= ~_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;	if (!IS_ENABLED(CONFIG_XPA))		pte.pte_low &= ~_PAGE_SILENT_READ;	pte.pte_high &= ~_PAGE_SILENT_READ;	return pte;} static inline pte_t pte_mkwrite_novma(pte_t pte){	pte.pte_low |= _PAGE_WRITE;	if (pte.pte_low & _PAGE_MODIFIED) {		if (!IS_ENABLED(CONFIG_XPA))			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) {		if (!IS_ENABLED(CONFIG_XPA))			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_NO_READ)) {		if (!IS_ENABLED(CONFIG_XPA))			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 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_novma(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 | _PAGE_SOFT_DIRTY;	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 (!(pte_val(pte) & _PAGE_NO_READ))		pte_val(pte) |= _PAGE_SILENT_READ;	return pte;} #define pte_sw_mkyoung	pte_mkyoung #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORTstatic 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;} #define pmd_write pmd_writestatic inline int pmd_write(pmd_t pmd){	return !!(pmd_val(pmd) & _PAGE_WRITE);} static inline struct page *pmd_page(pmd_t pmd){	if (pmd_val(pmd) & _PAGE_HUGE)		return pfn_to_page(pmd_pfn(pmd)); 	return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);}#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTYstatic inline bool pte_soft_dirty(pte_t pte){	return pte_val(pte) & _PAGE_SOFT_DIRTY;}#define pte_swp_soft_dirty pte_soft_dirty static inline pte_t pte_mksoft_dirty(pte_t pte){	pte_val(pte) |= _PAGE_SOFT_DIRTY;	return pte;}#define pte_swp_mksoft_dirty pte_mksoft_dirty static inline pte_t pte_clear_soft_dirty(pte_t pte){	pte_val(pte) &= ~(_PAGE_SOFT_DIRTY);	return pte;}#define pte_swp_clear_soft_dirty pte_clear_soft_dirty #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ #endif /* * 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);} #define pgprot_writecombine pgprot_writecombine static inline pgprot_t pgprot_writecombine(pgprot_t _prot){	unsigned long prot = pgprot_val(_prot); 	/* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */	prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine; 	return __pgprot(prot);} static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,						unsigned long address,						pte_t *ptep){} #define __HAVE_ARCH_PTE_SAMEstatic inline int pte_same(pte_t pte_a, pte_t pte_b){	return pte_val(pte_a) == pte_val(pte_b);} #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGSstatic inline int ptep_set_access_flags(struct vm_area_struct *vma,					unsigned long address, pte_t *ptep,					pte_t entry, int dirty){	if (!pte_same(*ptep, entry))		set_pte(ptep, entry);	/*

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