#ifndef _ASM_M32R_PGTABLE_H#define _ASM_M32R_PGTABLE_H #include <asm-generic/4level-fixup.h> #ifdef __KERNEL__/* * The Linux memory management assumes a three-level page table setup. On * the M32R, we use that, but "fold" the mid level into the top-level page * table, so that we physically have the same two-level page table as the * M32R mmu expects. * * This file contains the functions and defines necessary to modify and use * the M32R page table tree. */ /* CAUTION!: If you change macro definitions in this file, you might have to * change arch/m32r/mmu.S manually. */ #ifndef __ASSEMBLY__ #include <linux/threads.h>#include <asm/processor.h>#include <asm/addrspace.h>#include <asm/bitops.h>#include <asm/page.h> struct mm_struct;struct vm_area_struct; extern pgd_t swapper_pg_dir[1024];extern void paging_init(void); /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */extern unsigned long empty_zero_page[1024];#define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page)) #endif /* !__ASSEMBLY__ */ #ifndef __ASSEMBLY__#include <asm/pgtable-2level.h>#endif #define pgtable_cache_init()	do { } while (0) #define PMD_SIZE	(1UL << PMD_SHIFT)#define PMD_MASK	(~(PMD_SIZE - 1))#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)#define PGDIR_MASK	(~(PGDIR_SIZE - 1)) #define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)#define FIRST_USER_ADDRESS	0 #ifndef __ASSEMBLY__/* Just any arbitrary offset to the start of the vmalloc VM area: the * current 8MB value just means that there will be a 8MB "hole" after the * physical memory until the kernel virtual memory starts.  That means that * any out-of-bounds memory accesses will hopefully be caught. * The vmalloc() routines leaves a hole of 4kB between each vmalloced * area for the same reason. ;) */#define VMALLOC_START		KSEG2#define VMALLOC_END		KSEG3 /* *     M32R TLB format * *     [0]    [1:19]           [20:23]       [24:31] *     +-----------------------+----+-------------+ *     |          VPN          |0000|    ASID     | *     +-----------------------+----+-------------+ *     +-+---------------------+----+-+---+-+-+-+-+ *     |0         PPN          |0000|N|AC |L|G|V| | *     +-+---------------------+----+-+---+-+-+-+-+ *                                     RWX */ #define _PAGE_BIT_DIRTY		0	/* software: page changed */#define _PAGE_BIT_FILE		0	/* when !present: nonlinear file					   mapping */#define _PAGE_BIT_PRESENT	1	/* Valid: page is valid */#define _PAGE_BIT_GLOBAL	2	/* Global */#define _PAGE_BIT_LARGE		3	/* Large */#define _PAGE_BIT_EXEC		4	/* Execute */#define _PAGE_BIT_WRITE		5	/* Write */#define _PAGE_BIT_READ		6	/* Read */#define _PAGE_BIT_NONCACHABLE	7	/* Non cachable */#define _PAGE_BIT_ACCESSED	8	/* software: page referenced */#define _PAGE_BIT_PROTNONE	9	/* software: if not present */ #define _PAGE_DIRTY		(1UL << _PAGE_BIT_DIRTY)#define _PAGE_FILE		(1UL << _PAGE_BIT_FILE)#define _PAGE_PRESENT		(1UL << _PAGE_BIT_PRESENT)#define _PAGE_GLOBAL		(1UL << _PAGE_BIT_GLOBAL)#define _PAGE_LARGE		(1UL << _PAGE_BIT_LARGE)#define _PAGE_EXEC		(1UL << _PAGE_BIT_EXEC)#define _PAGE_WRITE		(1UL << _PAGE_BIT_WRITE)#define _PAGE_READ		(1UL << _PAGE_BIT_READ)#define _PAGE_NONCACHABLE	(1UL << _PAGE_BIT_NONCACHABLE)#define _PAGE_ACCESSED		(1UL << _PAGE_BIT_ACCESSED)#define _PAGE_PROTNONE		(1UL << _PAGE_BIT_PROTNONE) #define _PAGE_TABLE	\	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \	| _PAGE_DIRTY )#define _KERNPG_TABLE	\	( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \	| _PAGE_DIRTY )#define _PAGE_CHG_MASK	\	( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY ) #ifdef CONFIG_MMU#define PAGE_NONE	\	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)#define PAGE_SHARED	\	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)#define PAGE_SHARED_EXEC \	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \		| _PAGE_ACCESSED)#define PAGE_COPY	\	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)#define PAGE_COPY_EXEC	\	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)#define PAGE_READONLY	\	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)#define PAGE_READONLY_EXEC \	__pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED) #define __PAGE_KERNEL	\	( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \	| _PAGE_ACCESSED )#define __PAGE_KERNEL_RO	( __PAGE_KERNEL & ~_PAGE_WRITE )#define __PAGE_KERNEL_NOCACHE	( __PAGE_KERNEL | _PAGE_NONCACHABLE) #define MAKE_GLOBAL(x)	__pgprot((x) | _PAGE_GLOBAL) #define PAGE_KERNEL		MAKE_GLOBAL(__PAGE_KERNEL)#define PAGE_KERNEL_RO		MAKE_GLOBAL(__PAGE_KERNEL_RO)#define PAGE_KERNEL_NOCACHE	MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE) #else#define PAGE_NONE		__pgprot(0)#define PAGE_SHARED		__pgprot(0)#define PAGE_SHARED_EXEC	__pgprot(0)#define PAGE_COPY		__pgprot(0)#define PAGE_COPY_EXEC		__pgprot(0)#define PAGE_READONLY		__pgprot(0)#define PAGE_READONLY_EXEC	__pgprot(0) #define PAGE_KERNEL		__pgprot(0)#define PAGE_KERNEL_RO		__pgprot(0)#define PAGE_KERNEL_NOCACHE	__pgprot(0)#endif /* CONFIG_MMU */ 	/* xwr */#define __P000	PAGE_NONE#define __P001	PAGE_READONLY#define __P010	PAGE_COPY#define __P011	PAGE_COPY#define __P100	PAGE_READONLY_EXEC#define __P101	PAGE_READONLY_EXEC#define __P110	PAGE_COPY_EXEC#define __P111	PAGE_COPY_EXEC #define __S000	PAGE_NONE#define __S001	PAGE_READONLY#define __S010	PAGE_SHARED#define __S011	PAGE_SHARED#define __S100	PAGE_READONLY_EXEC#define __S101	PAGE_READONLY_EXEC#define __S110	PAGE_SHARED_EXEC#define __S111	PAGE_SHARED_EXEC /* page table for 0-4MB for everybody */ #define pte_present(x)	(pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))#define pte_clear(mm,addr,xp)	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) #define pmd_none(x)	(!pmd_val(x))#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)#define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)#define	pmd_bad(x)	((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE) #define pages_to_mb(x)	((x) >> (20 - PAGE_SHIFT)) /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */static inline int pte_read(pte_t pte){	return pte_val(pte) & _PAGE_READ;} static inline int pte_exec(pte_t pte){	return pte_val(pte) & _PAGE_EXEC;} 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_write(pte_t pte){	return pte_val(pte) & _PAGE_WRITE;} /* * The following only works if pte_present() is not true. */static inline int pte_file(pte_t pte){	return pte_val(pte) & _PAGE_FILE;} static inline pte_t pte_rdprotect(pte_t pte){	pte_val(pte) &= ~_PAGE_READ;	return pte;} static inline pte_t pte_exprotect(pte_t pte){	pte_val(pte) &= ~_PAGE_EXEC;	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_wrprotect(pte_t pte){	pte_val(pte) &= ~_PAGE_WRITE;	return pte;} static inline pte_t pte_mkread(pte_t pte){	pte_val(pte) |= _PAGE_READ;	return pte;} static inline pte_t pte_mkexec(pte_t pte){	pte_val(pte) |= _PAGE_EXEC;	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_mkwrite(pte_t pte){	pte_val(pte) |= _PAGE_WRITE;	return pte;} static inline  int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep){	return test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);} static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep){	return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);} static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep){	clear_bit(_PAGE_BIT_WRITE, ptep);} /* * Macro and implementation to make a page protection as uncachable. */static inline pgprot_t pgprot_noncached(pgprot_t _prot){	unsigned long prot = pgprot_val(_prot); 	prot |= _PAGE_NONCACHABLE;	return __pgprot(prot);} #define pgprot_writecombine(prot) pgprot_noncached(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) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot){	set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \		| pgprot_val(newprot))); 	return pte;} /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ static inline void pmd_set(pmd_t * pmdp, pte_t * ptep){	pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);} #define pmd_page_kernel(pmd)	\	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) #ifndef CONFIG_DISCONTIGMEM#define pmd_page(pmd)	(mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))#endif /* !CONFIG_DISCONTIGMEM */ /* to find an entry in a page-table-directory. */#define pgd_index(address)	\	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) #define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address)) /* to find an entry in a kernel page-table-directory */#define pgd_offset_k(address)	pgd_offset(&init_mm, address) #define pmd_index(address)	\	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) #define pte_index(address)	\	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))#define pte_offset_kernel(dir, address)	\	((pte_t *)pmd_page_kernel(*(dir)) + pte_index(address))#define pte_offset_map(dir, address)	\	((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))#define pte_offset_map_nested(dir, address)	pte_offset_map(dir, address)#define pte_unmap(pte)		do { } while (0)#define pte_unmap_nested(pte)	do { } while (0) /* Encode and de-code a swap entry */#define __swp_type(x)			(((x).val >> 2) & 0x3f)#define __swp_offset(x)			((x).val >> 10)#define __swp_entry(type, offset)	\	((swp_entry_t) { ((type) << 2) | ((offset) << 10) })#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })#define __swp_entry_to_pte(x)		((pte_t) { (x).val }) #endif /* !__ASSEMBLY__ */ /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */#define kern_addr_valid(addr)	(1) #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)	\		remap_pfn_range(vma, vaddr, pfn, size, prot) #define MK_IOSPACE_PFN(space, pfn)	(pfn)#define GET_IOSPACE(pfn)		0#define GET_PFN(pfn)			(pfn) #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY#define __HAVE_ARCH_PTEP_GET_AND_CLEAR#define __HAVE_ARCH_PTEP_SET_WRPROTECT#define __HAVE_ARCH_PTE_SAME#include <asm-generic/pgtable.h> #endif /* __KERNEL__ */ #endif /* _ASM_M32R_PGTABLE_H */