arch/sparc/include/asm/pgtable_32.h - kernel/msm-4.19 - Gitiles

 #ifndef _SPARC_PGTABLE_H
 #define _SPARC_PGTABLE_H

 /*  asm/pgtable.h:  Defines and functions used to work
  *                        with Sparc page tables.
  *
  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  */

 #ifndef __ASSEMBLY__
 #include <asm-generic/4level-fixup.h>

 #include <linux/spinlock.h>
 #include <linux/swap.h>
 #include <asm/types.h>
 #include <asm/pgtsun4c.h>
 #include <asm/pgtsrmmu.h>
 #include <asm/vac-ops.h>
 #include <asm/oplib.h>
 #include <asm/btfixup.h>
 #include <asm/system.h>


 struct vm_area_struct;
 struct page;

 extern void load_mmu(void);
 extern unsigned long calc_highpages(void);

 BTFIXUPDEF_SIMM13(pgdir_shift)
 BTFIXUPDEF_SETHI(pgdir_size)
 BTFIXUPDEF_SETHI(pgdir_mask)

 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)

 #define pte_ERROR(e)   __builtin_trap()
 #define pmd_ERROR(e)   __builtin_trap()
 #define pgd_ERROR(e)   __builtin_trap()

 BTFIXUPDEF_INT(page_none)
 BTFIXUPDEF_INT(page_copy)
 BTFIXUPDEF_INT(page_readonly)
 BTFIXUPDEF_INT(page_kernel)

 #define PMD_SHIFT		SUN4C_PMD_SHIFT
 #define PMD_SIZE        	(1UL << PMD_SHIFT)
 #define PMD_MASK        	(~(PMD_SIZE-1))
 #define PMD_ALIGN(__addr) 	(((__addr) + ~PMD_MASK) & PMD_MASK)
 #define PGDIR_SHIFT     	BTFIXUP_SIMM13(pgdir_shift)
 #define PGDIR_SIZE      	BTFIXUP_SETHI(pgdir_size)
 #define PGDIR_MASK      	BTFIXUP_SETHI(pgdir_mask)
 #define PTRS_PER_PTE    	1024
 #define PTRS_PER_PMD    	BTFIXUP_SIMM13(ptrs_per_pmd)
 #define PTRS_PER_PGD    	BTFIXUP_SIMM13(ptrs_per_pgd)
 #define USER_PTRS_PER_PGD	BTFIXUP_SIMM13(user_ptrs_per_pgd)
 #define FIRST_USER_ADDRESS	0
 #define PTE_SIZE		(PTRS_PER_PTE*4)

 #define PAGE_NONE      __pgprot(BTFIXUP_INT(page_none))
 extern pgprot_t PAGE_SHARED;
 #define PAGE_COPY      __pgprot(BTFIXUP_INT(page_copy))
 #define PAGE_READONLY  __pgprot(BTFIXUP_INT(page_readonly))

 extern unsigned long page_kernel;

 #ifdef MODULE
 #define PAGE_KERNEL	page_kernel
 #else
 #define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))
 #endif

 /* Top-level page directory */
 extern pgd_t swapper_pg_dir[1024];

 extern void paging_init(void);

 /* Page table for 0-4MB for everybody, on the Sparc this
  * holds the same as on the i386.
  */
 extern pte_t pg0[1024];
 extern pte_t pg1[1024];
 extern pte_t pg2[1024];
 extern pte_t pg3[1024];

 extern unsigned long ptr_in_current_pgd;

 /* Here is a trick, since mmap.c need the initializer elements for
  * protection_map[] to be constant at compile time, I set the following
  * to all zeros.  I set it to the real values after I link in the
  * appropriate MMU page table routines at boot time.
  */
 #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 int num_contexts;

 /* First physical page can be anywhere, the following is needed so that
  * va-->pa and vice versa conversions work properly without performance
  * hit for all __pa()/__va() operations.
  */
 extern unsigned long phys_base;
 extern unsigned long pfn_base;

 /*
  * BAD_PAGETABLE is used when we need a bogus page-table, while
  * BAD_PAGE is used for a bogus page.
  *
  * ZERO_PAGE is a global shared page that is always zero: used
  * for zero-mapped memory areas etc..
  */
 extern pte_t * __bad_pagetable(void);
 extern pte_t __bad_page(void);
 extern unsigned long empty_zero_page;

 #define BAD_PAGETABLE __bad_pagetable()
 #define BAD_PAGE __bad_page()
 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))

 /*
  */
 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)

 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)

 BTFIXUPDEF_SETHI(none_mask)
 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)

 static inline int pte_none(pte_t pte)
 {
 	return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
 }

 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)

 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)

 static inline int pmd_none(pmd_t pmd)
 {
 	return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
 }

 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)

 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)

 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)

 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
 BTFIXUPDEF_HALF(pte_writei)
 BTFIXUPDEF_HALF(pte_dirtyi)
 BTFIXUPDEF_HALF(pte_youngi)

 static int pte_write(pte_t pte) __attribute_const__;
 static inline int pte_write(pte_t pte)
 {
 	return pte_val(pte) & BTFIXUP_HALF(pte_writei);
 }

 static int pte_dirty(pte_t pte) __attribute_const__;
 static inline int pte_dirty(pte_t pte)
 {
 	return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
 }

 static int pte_young(pte_t pte) __attribute_const__;
 static inline int pte_young(pte_t pte)
 {
 	return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
 }

 /*
  * The following only work if pte_present() is not true.
  */
 BTFIXUPDEF_HALF(pte_filei)

 static int pte_file(pte_t pte) __attribute_const__;
 static inline int pte_file(pte_t pte)
 {
 	return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 }

 static inline int pte_special(pte_t pte)
 {
 	return 0;
 }

 /*
  */
 BTFIXUPDEF_HALF(pte_wrprotecti)
 BTFIXUPDEF_HALF(pte_mkcleani)
 BTFIXUPDEF_HALF(pte_mkoldi)

 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
 static inline pte_t pte_wrprotect(pte_t pte)
 {
 	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
 }

 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
 static inline pte_t pte_mkclean(pte_t pte)
 {
 	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
 }

 static pte_t pte_mkold(pte_t pte) __attribute_const__;
 static inline pte_t pte_mkold(pte_t pte)
 {
 	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
 }

 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)

 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)

 #define pte_mkspecial(pte)    (pte)

 #define pfn_pte(pfn, prot)		mk_pte(pfn_to_page(pfn), prot)

 BTFIXUPDEF_CALL(unsigned long,	 pte_pfn, pte_t)
 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
 #define pte_page(pte)	pfn_to_page(pte_pfn(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.
  */
 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)

 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)

 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)

 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)

 BTFIXUPDEF_INT(pte_modify_mask)

 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
 	return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
 		pgprot_val(newprot));
 }

 #define pgd_index(address) ((address) >> PGDIR_SHIFT)

 /* to find an entry in a page-table-directory */
 #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)

 /* Find an entry in the second-level page table.. */
 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)

 /* Find an entry in the third-level page table.. */
 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)

 /*
  * This shortcut works on sun4m (and sun4d) because the nocache area is static,
  * and sun4c is guaranteed to have no highmem anyway.
  */
 #define pte_offset_map(d, a)		pte_offset_kernel(d,a)
 #define pte_offset_map_nested(d, a)	pte_offset_kernel(d,a)

 #define pte_unmap(pte)		do{}while(0)
 #define pte_unmap_nested(pte)	do{}while(0)

 /* Certain architectures need to do special things when pte's
  * within a page table are directly modified.  Thus, the following
  * hook is made available.
  */

 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)

 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

 struct seq_file;
 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)

 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)

 /* Fault handler stuff... */
 #define FAULT_CODE_PROT     0x1
 #define FAULT_CODE_WRITE    0x2
 #define FAULT_CODE_USER     0x4

 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)

 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)

 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
     unsigned long, unsigned int)
 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)

 extern int invalid_segment;

 /* Encode and de-code a swap entry */
 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)

 #define __swp_type(__x)			BTFIXUP_CALL(__swp_type)(__x)
 #define __swp_offset(__x)		BTFIXUP_CALL(__swp_offset)(__x)
 #define __swp_entry(__type,__off)	BTFIXUP_CALL(__swp_entry)(__type,__off)

 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })

 /* file-offset-in-pte helpers */
 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);

 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)

 /*
  * This is made a constant because mm/fremap.c required a constant.
  * Note that layout of these bits is different between sun4c.c and srmmu.c.
  */
 #define PTE_FILE_MAX_BITS 24

 /*
  */
 struct ctx_list {
 	struct ctx_list *next;
 	struct ctx_list *prev;
 	unsigned int ctx_number;
 	struct mm_struct *ctx_mm;
 };

 extern struct ctx_list *ctx_list_pool;  /* Dynamically allocated */
 extern struct ctx_list ctx_free;        /* Head of free list */
 extern struct ctx_list ctx_used;        /* Head of used contexts list */

 #define NO_CONTEXT     -1

 static inline void remove_from_ctx_list(struct ctx_list *entry)
 {
 	entry->next->prev = entry->prev;
 	entry->prev->next = entry->next;
 }

 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
 {
 	entry->next = head;
 	(entry->prev = head->prev)->next = entry;
 	head->prev = entry;
 }
 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)

 static inline unsigned long
 __get_phys (unsigned long addr)
 {
 	switch (sparc_cpu_model){
 	case sun4:
 	case sun4c:
 		return sun4c_get_pte (addr) << PAGE_SHIFT;
 	case sun4m:
 	case sun4d:
 		return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 	default:
 		return 0;
 	}
 }

 static inline int
 __get_iospace (unsigned long addr)
 {
 	switch (sparc_cpu_model){
 	case sun4:
 	case sun4c:
 		return -1; /* Don't check iospace on sun4c */
 	case sun4m:
 	case sun4d:
 		return (srmmu_get_pte (addr) >> 28);
 	default:
 		return -1;
 	}
 }

 extern unsigned long *sparc_valid_addr_bitmap;

 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 #define kern_addr_valid(addr) \
 	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))

 extern int io_remap_pfn_range(struct vm_area_struct *vma,
 			      unsigned long from, unsigned long pfn,
 			      unsigned long size, pgprot_t prot);

 /*
  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
  * its high 4 bits.  These macros/functions put it there or get it from there.
  */
 #define MK_IOSPACE_PFN(space, pfn)	(pfn | (space << (BITS_PER_LONG - 4)))
 #define GET_IOSPACE(pfn)		(pfn >> (BITS_PER_LONG - 4))
 #define GET_PFN(pfn)			(pfn & 0x0fffffffUL)

 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 ({									  \
 	int __changed = !pte_same(*(__ptep), __entry);			  \
 	if (__changed) {						  \
 		set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 		flush_tlb_page(__vma, __address);			  \
 	}								  \
 	(sparc_cpu_model == sun4c) || __changed;			  \
 })

 #include <asm-generic/pgtable.h>

 #endif /* !(__ASSEMBLY__) */

 #define VMALLOC_START           0xfe600000
 /* XXX Alter this when I get around to fixing sun4c - Anton */
 #define VMALLOC_END             0xffc00000


 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 #define HAVE_ARCH_UNMAPPED_AREA

 /*
  * No page table caches to initialise
  */
 #define pgtable_cache_init()	do { } while (0)

 #endif /* !(_SPARC_PGTABLE_H) */
	#ifndef _SPARC_PGTABLE_H
	#define _SPARC_PGTABLE_H

	/* asm/pgtable.h: Defines and functions used to work
	* with Sparc page tables.
	*
	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	*/

	#ifndef __ASSEMBLY__
	#include <asm-generic/4level-fixup.h>

	#include <linux/spinlock.h>
	#include <linux/swap.h>
	#include <asm/types.h>
	#include <asm/pgtsun4c.h>
	#include <asm/pgtsrmmu.h>
	#include <asm/vac-ops.h>
	#include <asm/oplib.h>
	#include <asm/btfixup.h>
	#include <asm/system.h>


	struct vm_area_struct;
	struct page;

	extern void load_mmu(void);
	extern unsigned long calc_highpages(void);

	BTFIXUPDEF_SIMM13(pgdir_shift)
	BTFIXUPDEF_SETHI(pgdir_size)
	BTFIXUPDEF_SETHI(pgdir_mask)

	BTFIXUPDEF_SIMM13(ptrs_per_pmd)
	BTFIXUPDEF_SIMM13(ptrs_per_pgd)
	BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)

	#define pte_ERROR(e) __builtin_trap()
	#define pmd_ERROR(e) __builtin_trap()
	#define pgd_ERROR(e) __builtin_trap()

	BTFIXUPDEF_INT(page_none)
	BTFIXUPDEF_INT(page_copy)
	BTFIXUPDEF_INT(page_readonly)
	BTFIXUPDEF_INT(page_kernel)

	#define PMD_SHIFT SUN4C_PMD_SHIFT
	#define PMD_SIZE (1UL << PMD_SHIFT)
	#define PMD_MASK (~(PMD_SIZE-1))
	#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
	#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
	#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
	#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
	#define PTRS_PER_PTE 1024
	#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
	#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
	#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
	#define FIRST_USER_ADDRESS 0
	#define PTE_SIZE (PTRS_PER_PTE*4)

	#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
	extern pgprot_t PAGE_SHARED;
	#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
	#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))

	extern unsigned long page_kernel;

	#ifdef MODULE
	#define PAGE_KERNEL page_kernel
	#else
	#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
	#endif

	/* Top-level page directory */
	extern pgd_t swapper_pg_dir[1024];

	extern void paging_init(void);

	/* Page table for 0-4MB for everybody, on the Sparc this
	* holds the same as on the i386.
	*/
	extern pte_t pg0[1024];
	extern pte_t pg1[1024];
	extern pte_t pg2[1024];
	extern pte_t pg3[1024];

	extern unsigned long ptr_in_current_pgd;

	/* Here is a trick, since mmap.c need the initializer elements for
	* protection_map[] to be constant at compile time, I set the following
	* to all zeros. I set it to the real values after I link in the
	* appropriate MMU page table routines at boot time.
	*/
	#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 int num_contexts;

	/* First physical page can be anywhere, the following is needed so that
	* va-->pa and vice versa conversions work properly without performance
	* hit for all __pa()/__va() operations.
	*/
	extern unsigned long phys_base;
	extern unsigned long pfn_base;

	/*
	* BAD_PAGETABLE is used when we need a bogus page-table, while
	* BAD_PAGE is used for a bogus page.
	*
	* ZERO_PAGE is a global shared page that is always zero: used
	* for zero-mapped memory areas etc..
	*/
	extern pte_t * __bad_pagetable(void);
	extern pte_t __bad_page(void);
	extern unsigned long empty_zero_page;

	#define BAD_PAGETABLE __bad_pagetable()
	#define BAD_PAGE __bad_page()
	#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))

	/*
	*/
	BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
	BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)

	#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
	#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)

	BTFIXUPDEF_SETHI(none_mask)
	BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
	BTFIXUPDEF_CALL(void, pte_clear, pte_t *)

	static inline int pte_none(pte_t pte)
	{
	return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
	}

	#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
	#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)

	BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
	BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
	BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)

	static inline int pmd_none(pmd_t pmd)
	{
	return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
	}

	#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
	#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
	#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)

	BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
	BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
	BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
	BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)

	#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
	#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
	#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
	#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)

	/*
	* The following only work if pte_present() is true.
	* Undefined behaviour if not..
	*/
	BTFIXUPDEF_HALF(pte_writei)
	BTFIXUPDEF_HALF(pte_dirtyi)
	BTFIXUPDEF_HALF(pte_youngi)

	static int pte_write(pte_t pte) __attribute_const__;
	static inline int pte_write(pte_t pte)
	{
	return pte_val(pte) & BTFIXUP_HALF(pte_writei);
	}

	static int pte_dirty(pte_t pte) __attribute_const__;
	static inline int pte_dirty(pte_t pte)
	{
	return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
	}

	static int pte_young(pte_t pte) __attribute_const__;
	static inline int pte_young(pte_t pte)
	{
	return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
	}

	/*
	* The following only work if pte_present() is not true.
	*/
	BTFIXUPDEF_HALF(pte_filei)

	static int pte_file(pte_t pte) __attribute_const__;
	static inline int pte_file(pte_t pte)
	{
	return pte_val(pte) & BTFIXUP_HALF(pte_filei);
	}

	static inline int pte_special(pte_t pte)
	{
	return 0;
	}

	/*
	*/
	BTFIXUPDEF_HALF(pte_wrprotecti)
	BTFIXUPDEF_HALF(pte_mkcleani)
	BTFIXUPDEF_HALF(pte_mkoldi)

	static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
	static inline pte_t pte_wrprotect(pte_t pte)
	{
	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
	}

	static pte_t pte_mkclean(pte_t pte) __attribute_const__;
	static inline pte_t pte_mkclean(pte_t pte)
	{
	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
	}

	static pte_t pte_mkold(pte_t pte) __attribute_const__;
	static inline pte_t pte_mkold(pte_t pte)
	{
	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
	}

	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)

	#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
	#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
	#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)

	#define pte_mkspecial(pte) (pte)

	#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)

	BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
	#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
	#define pte_page(pte) pfn_to_page(pte_pfn(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.
	*/
	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)

	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
	BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)

	#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
	#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
	#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)

	#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)

	BTFIXUPDEF_INT(pte_modify_mask)

	static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	{
	return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) \|
	pgprot_val(newprot));
	}

	#define pgd_index(address) ((address) >> PGDIR_SHIFT)

	/* to find an entry in a page-table-directory */
	#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)

	/* Find an entry in the second-level page table.. */
	BTFIXUPDEF_CALL(pmd_t , pmd_offset, pgd_t , unsigned long)
	#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)

	/* Find an entry in the third-level page table.. */
	BTFIXUPDEF_CALL(pte_t , pte_offset_kernel, pmd_t , unsigned long)
	#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)

	/*
	* This shortcut works on sun4m (and sun4d) because the nocache area is static,
	* and sun4c is guaranteed to have no highmem anyway.
	*/
	#define pte_offset_map(d, a) pte_offset_kernel(d,a)
	#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)

	#define pte_unmap(pte) do{}while(0)
	#define pte_unmap_nested(pte) do{}while(0)

	/* Certain architectures need to do special things when pte's
	* within a page table are directly modified. Thus, the following
	* hook is made available.
	*/

	BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)

	#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

	struct seq_file;
	BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)

	#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)

	/* Fault handler stuff... */
	#define FAULT_CODE_PROT 0x1
	#define FAULT_CODE_WRITE 0x2
	#define FAULT_CODE_USER 0x4

	BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct , unsigned long, pte_t )

	#define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)

	BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
	unsigned long, unsigned int)
	BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
	#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
	#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)

	extern int invalid_segment;

	/* Encode and de-code a swap entry */
	BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
	BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
	BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)

	#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
	#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
	#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)

	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })

	/* file-offset-in-pte helpers */
	BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
	BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);

	#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
	#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)

	/*
	* This is made a constant because mm/fremap.c required a constant.
	* Note that layout of these bits is different between sun4c.c and srmmu.c.
	*/
	#define PTE_FILE_MAX_BITS 24

	/*
	*/
	struct ctx_list {
	struct ctx_list *next;
	struct ctx_list *prev;
	unsigned int ctx_number;
	struct mm_struct *ctx_mm;
	};

	extern struct ctx_list ctx_list_pool; / Dynamically allocated */
	extern struct ctx_list ctx_free; /* Head of free list */
	extern struct ctx_list ctx_used; /* Head of used contexts list */

	#define NO_CONTEXT -1

	static inline void remove_from_ctx_list(struct ctx_list *entry)
	{
	entry->next->prev = entry->prev;
	entry->prev->next = entry->next;
	}

	static inline void add_to_ctx_list(struct ctx_list head, struct ctx_list entry)
	{
	entry->next = head;
	(entry->prev = head->prev)->next = entry;
	head->prev = entry;
	}
	#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
	#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)

	static inline unsigned long
	__get_phys (unsigned long addr)
	{
	switch (sparc_cpu_model){
	case sun4:
	case sun4c:
	return sun4c_get_pte (addr) << PAGE_SHIFT;
	case sun4m:
	case sun4d:
	return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
	default:
	return 0;
	}
	}

	static inline int
	__get_iospace (unsigned long addr)
	{
	switch (sparc_cpu_model){
	case sun4:
	case sun4c:
	return -1; /* Don't check iospace on sun4c */
	case sun4m:
	case sun4d:
	return (srmmu_get_pte (addr) >> 28);
	default:
	return -1;
	}
	}

	extern unsigned long *sparc_valid_addr_bitmap;

	/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
	#define kern_addr_valid(addr) \
	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))

	extern int io_remap_pfn_range(struct vm_area_struct *vma,
	unsigned long from, unsigned long pfn,
	unsigned long size, pgprot_t prot);

	/*
	* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
	* its high 4 bits. These macros/functions put it there or get it from there.
	*/
	#define MK_IOSPACE_PFN(space, pfn) (pfn \| (space << (BITS_PER_LONG - 4)))
	#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
	#define GET_PFN(pfn) (pfn & 0x0fffffffUL)

	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
	#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
	({ \
	int __changed = !pte_same(*(__ptep), __entry); \
	if (__changed) { \
	set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
	flush_tlb_page(__vma, __address); \
	} \
	(sparc_cpu_model == sun4c) \|\| __changed; \
	})

	#include <asm-generic/pgtable.h>

	#endif /* !(__ASSEMBLY__) */

	#define VMALLOC_START 0xfe600000
	/* XXX Alter this when I get around to fixing sun4c - Anton */
	#define VMALLOC_END 0xffc00000


	/* We provide our own get_unmapped_area to cope with VA holes for userland */
	#define HAVE_ARCH_UNMAPPED_AREA

	/*
	* No page table caches to initialise
	*/
	#define pgtable_cache_init() do { } while (0)

	#endif /* !(_SPARC_PGTABLE_H) */