/*  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) * Copyright 2003 PathScale, Inc. * Derived from include/asm-i386/pgtable.h * Licensed under the GPL */ #ifndef __UM_PGTABLE_H#define __UM_PGTABLE_H #include "linux/sched.h"#include "linux/linkage.h"#include "asm/processor.h"#include "asm/page.h"#include "asm/fixmap.h" #define _PAGE_PRESENT	0x001#define _PAGE_NEWPAGE	0x002#define _PAGE_NEWPROT	0x004#define _PAGE_RW	0x020#define _PAGE_USER	0x040#define _PAGE_ACCESSED	0x080#define _PAGE_DIRTY	0x100/* If _PAGE_PRESENT is clear, we use these: */#define _PAGE_FILE	0x008	/* nonlinear file mapping, saved PTE; unset:swap */#define _PAGE_PROTNONE	0x010	/* if the user mapped it with PROT_NONE;				   pte_present gives true */ #ifdef CONFIG_3_LEVEL_PGTABLES#include "asm/pgtable-3level.h"#else#include "asm/pgtable-2level.h"#endif extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt,			     pte_t *pte_out); /* zero page used for uninitialized stuff */extern unsigned long *empty_zero_page; #define pgtable_cache_init() do ; while (0) /* * pgd entries used up by user/kernel: */ #define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT)#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS) #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. ;) */ extern unsigned long end_iomem; #define VMALLOC_OFFSET	(__va_space)#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) #ifdef CONFIG_HIGHMEM# define VMALLOC_END	(PKMAP_BASE-2*PAGE_SIZE)#else# define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)#endif #define REGION_SHIFT	(sizeof(pte_t) * 8 - 4)#define REGION_MASK	(((unsigned long) 0xf) << REGION_SHIFT) #define _PAGE_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)#define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) #define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)#define PAGE_KERNEL_RO	__pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED) /* * The i386 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#define __P001	PAGE_READONLY#define __P010	PAGE_COPY#define __P011	PAGE_COPY#define __P100	PAGE_READONLY#define __P101	PAGE_READONLY#define __P110	PAGE_COPY#define __P111	PAGE_COPY #define __S000	PAGE_NONE#define __S001	PAGE_READONLY#define __S010	PAGE_SHARED#define __S011	PAGE_SHARED#define __S100	PAGE_READONLY#define __S101	PAGE_READONLY#define __S110	PAGE_SHARED#define __S111	PAGE_SHARED /* * Define this if things work differently on an i386 and an i486: * it will (on an i486) warn about kernel memory accesses that are * done without a 'access_ok(VERIFY_WRITE,..)' */#undef TEST_VERIFY_AREA /* page table for 0-4MB for everybody */extern unsigned long pg0[1024]; /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) /* number of bits that fit into a memory pointer */#define BITS_PER_PTR			(8*sizeof(unsigned long)) /* to align the pointer to a pointer address */#define PTR_MASK			(~(sizeof(void*)-1)) /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 *//* 64-bit machines, beware!  SRB. */#define SIZEOF_PTR_LOG2			3 /* to find an entry in a page-table */#define PAGE_PTR(address) \((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK) #define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE)) #define pmd_none(x)	(!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))#define	pmd_bad(x)	((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)#define pmd_clear(xp)	do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0) #define pmd_newpage(x)  (pmd_val(x) & _PAGE_NEWPAGE)#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE) #define pud_newpage(x)  (pud_val(x) & _PAGE_NEWPAGE)#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) #define pte_page(x) pfn_to_page(pte_pfn(x))#define pte_address(x) (__va(pte_val(x) & PAGE_MASK))#define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT))#define phys_addr(p) ((p) & ~REGION_MASK) #define pte_present(x)	pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE)) /* * ================================= * Flags checking section. * ================================= */ static inline int pte_none(pte_t pte){	return pte_is_zero(pte);} /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */static inline int pte_user(pte_t pte){	return((pte_get_bits(pte, _PAGE_USER)) &&	       !(pte_get_bits(pte, _PAGE_PROTNONE)));} static inline int pte_read(pte_t pte){ 	return((pte_get_bits(pte, _PAGE_USER)) &&	       !(pte_get_bits(pte, _PAGE_PROTNONE)));} static inline int pte_exec(pte_t pte){	return((pte_get_bits(pte, _PAGE_USER)) &&	       !(pte_get_bits(pte, _PAGE_PROTNONE)));} static inline int pte_write(pte_t pte){	return((pte_get_bits(pte, _PAGE_RW)) &&	       !(pte_get_bits(pte, _PAGE_PROTNONE)));} /* * The following only works if pte_present() is not true. */static inline int pte_file(pte_t pte){	return pte_get_bits(pte, _PAGE_FILE);} static inline int pte_dirty(pte_t pte){	return pte_get_bits(pte, _PAGE_DIRTY);} static inline int pte_young(pte_t pte){	return pte_get_bits(pte, _PAGE_ACCESSED);} static inline int pte_newpage(pte_t pte){	return pte_get_bits(pte, _PAGE_NEWPAGE);} static inline int pte_newprot(pte_t pte){ 	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));} /* * ================================= * Flags setting section. * ================================= */ static inline pte_t pte_mknewprot(pte_t pte){	pte_set_bits(pte, _PAGE_NEWPROT);	return(pte);} static inline pte_t pte_rdprotect(pte_t pte){ 	pte_clear_bits(pte, _PAGE_USER);	return(pte_mknewprot(pte));} static inline pte_t pte_exprotect(pte_t pte){ 	pte_clear_bits(pte, _PAGE_USER);	return(pte_mknewprot(pte));} static inline pte_t pte_mkclean(pte_t pte){	pte_clear_bits(pte, _PAGE_DIRTY);	return(pte);} static inline pte_t pte_mkold(pte_t pte)	{ 	pte_clear_bits(pte, _PAGE_ACCESSED);	return(pte);} static inline pte_t pte_wrprotect(pte_t pte){ 	pte_clear_bits(pte, _PAGE_RW);	return(pte_mknewprot(pte)); } static inline pte_t pte_mkread(pte_t pte){ 	pte_set_bits(pte, _PAGE_USER);	return(pte_mknewprot(pte)); } static inline pte_t pte_mkdirty(pte_t pte){ 	pte_set_bits(pte, _PAGE_DIRTY);	return(pte);} static inline pte_t pte_mkyoung(pte_t pte){	pte_set_bits(pte, _PAGE_ACCESSED);	return(pte);} static inline pte_t pte_mkwrite(pte_t pte)	{	pte_set_bits(pte, _PAGE_RW);	return(pte_mknewprot(pte)); } static inline pte_t pte_mkuptodate(pte_t pte)	{	pte_clear_bits(pte, _PAGE_NEWPAGE);	if(pte_present(pte))		pte_clear_bits(pte, _PAGE_NEWPROT);	return(pte); } static inline pte_t pte_mknewpage(pte_t pte){	pte_set_bits(pte, _PAGE_NEWPAGE);	return(pte);} static inline void set_pte(pte_t *pteptr, pte_t pteval){	pte_copy(*pteptr, pteval); 	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so	 * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to	 * mapped pages.	 */ 	*pteptr = pte_mknewpage(*pteptr);	if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);}#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) /* * 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 phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))#define __virt_to_page(virt) phys_to_page(__pa(virt))#define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) #define mk_pte(page, pgprot) \	({ pte_t pte;					\							\	pte_set_val(pte, page_to_phys(page), (pgprot));	\	if (pte_present(pte))				\		pte_mknewprot(pte_mknewpage(pte));	\	pte;}) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot){	pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);	return pte; } #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) /* * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] * * this macro returns the index of the entry in the pgd page which would * control the given virtual address */#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) #define pgd_index_k(addr) pgd_index(addr) /* * pgd_offset() returns a (pgd_t *) * pgd_index() is used get the offset into the pgd page's array of pgd_t's; */#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) /* * a shortcut which implies the use of the kernel's pgd, instead * of a process's */#define pgd_offset_k(address) pgd_offset(&init_mm, address) /* * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] * * this macro returns the index of the entry in the pmd page which would * control the given virtual address */#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) /* * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] * * this macro returns the index of the entry in the pte page which would * control the given virtual address */#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))#define pte_offset_kernel(dir, address) \	((pte_t *) pmd_page_vaddr(*(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) #define update_mmu_cache(vma,address,pte) do ; while (0) /* Encode and de-code a swap entry */#define __swp_type(x)			(((x).val >> 4) & 0x3f)#define __swp_offset(x)			((x).val >> 11) #define __swp_entry(type, offset) \	((swp_entry_t) { ((type) << 4) | ((offset) << 11) })#define __pte_to_swp_entry(pte) \	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })#define __swp_entry_to_pte(x)		((pte_t) { (x).val }) #define kern_addr_valid(addr) (1) #include <asm-generic/pgtable.h> #include <asm-generic/pgtable-nopud.h> #ifdef CONFIG_HIGHMEM/* Clear a kernel PTE and flush it from the TLB */#define kpte_clear_flush(ptep, vaddr)					\do {									\	pte_clear(&init_mm, vaddr, ptep);				\	__flush_tlb_one(vaddr);						\} while (0)#endif #endif#endif #define virt_to_page(addr) __virt_to_page((const unsigned long) addr) /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only.  This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-file-style: "linux" * End: */