[mirror_ubuntu-bionic-kernel.git] / include / asm-sparc / pgtable.h

/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
#ifndef _SPARC_PGTABLE_H
#define _SPARC_PGTABLE_H

/*  asm-sparc/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)
 */

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

#include <linux/config.h>
#include <linux/spinlock.h>
#include <linux/swap.h>
#include <asm/types.h>
#ifdef CONFIG_SUN4
#include <asm/pgtsun4.h>
#else
#include <asm/pgtsun4c.h>
#endif
#include <asm/pgtsrmmu.h>
#include <asm/vac-ops.h>
#include <asm/oplib.h>
#include <asm/btfixup.h>
#include <asm/system.h>

#ifndef __ASSEMBLY__

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_shared)
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))
#define PAGE_SHARED    __pgprot(BTFIXUP_INT(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, pgd_t)

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

BTFIXUPDEF_SETHI(none_mask)
BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
BTFIXUPDEF_CALL(int, pte_read, 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)
#define pte_read(pte) BTFIXUP_CALL(pte_read)(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)

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

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

extern 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)

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

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

extern 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));
}

extern 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));
}

extern 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 page_pte_prot(page, prot)	mk_pte(page, prot)
#define page_pte(page)			mk_pte(page, __pgprot(0))
#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)

#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)

BTFIXUPDEF_INT(pte_modify_mask)

extern 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)

/* The permissions for pgprot_val to make a page mapped on the obio space */
extern unsigned int pg_iobits;

/* 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,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)

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)

#include <asm-generic/pgtable.h>

#endif /* !(__ASSEMBLY__) */

/* 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) */
Commit	Line	Data
1da177e4 LT	1	/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
	2	#ifndef _SPARC_PGTABLE_H
	3	#define _SPARC_PGTABLE_H
	4
	5	/* asm-sparc/pgtable.h: Defines and functions used to work
	6	* with Sparc page tables.
	7	*
	8	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	9	* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	10	*/
	11
	12	#include <asm-generic/4level-fixup.h>
	13
	14	#include <linux/config.h>
	15	#include <linux/spinlock.h>
	16	#include <linux/swap.h>
	17	#include <asm/types.h>
	18	#ifdef CONFIG_SUN4
	19	#include <asm/pgtsun4.h>
	20	#else
	21	#include <asm/pgtsun4c.h>
	22	#endif
	23	#include <asm/pgtsrmmu.h>
	24	#include <asm/vac-ops.h>
	25	#include <asm/oplib.h>
	26	#include <asm/btfixup.h>
	27	#include <asm/system.h>
	28
	29	#ifndef __ASSEMBLY__
	30
	31	struct vm_area_struct;
	32	struct page;
	33
	34	extern void load_mmu(void);
	35	extern unsigned long calc_highpages(void);
	36
	37	BTFIXUPDEF_SIMM13(pgdir_shift)
	38	BTFIXUPDEF_SETHI(pgdir_size)
	39	BTFIXUPDEF_SETHI(pgdir_mask)
	40
	41	BTFIXUPDEF_SIMM13(ptrs_per_pmd)
	42	BTFIXUPDEF_SIMM13(ptrs_per_pgd)
	43	BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
	44
	45	#define pte_ERROR(e) __builtin_trap()
	46	#define pmd_ERROR(e) __builtin_trap()
	47	#define pgd_ERROR(e) __builtin_trap()
	48
	49	BTFIXUPDEF_INT(page_none)
	50	BTFIXUPDEF_INT(page_shared)
	51	BTFIXUPDEF_INT(page_copy)
	52	BTFIXUPDEF_INT(page_readonly)
	53	BTFIXUPDEF_INT(page_kernel)
	54
	55	#define PMD_SHIFT SUN4C_PMD_SHIFT
	56	#define PMD_SIZE (1UL << PMD_SHIFT)
	57	#define PMD_MASK (~(PMD_SIZE-1))
	58	#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
	59	#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
	60	#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
	61	#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
	62	#define PTRS_PER_PTE 1024
	63	#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
	64	#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
65	#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
d455a369	66	#define FIRST_USER_ADDRESS 0
1da177e4 LT	67	#define PTE_SIZE (PTRS_PER_PTE*4)
	68
	69	#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
	70	#define PAGE_SHARED __pgprot(BTFIXUP_INT(page_shared))
	71	#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
	72	#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
	73
	74	extern unsigned long page_kernel;
	75
	76	#ifdef MODULE
	77	#define PAGE_KERNEL page_kernel
	78	#else
	79	#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
	80	#endif
	81
	82	/* Top-level page directory */
	83	extern pgd_t swapper_pg_dir[1024];
	84
801ab3c7 DM	85	extern void paging_init(void);
801ab3c7 DM	86
1da177e4 LT	87	/* Page table for 0-4MB for everybody, on the Sparc this
	88	* holds the same as on the i386.
	89	*/
	90	extern pte_t pg0[1024];
	91	extern pte_t pg1[1024];
	92	extern pte_t pg2[1024];
	93	extern pte_t pg3[1024];
	94
	95	extern unsigned long ptr_in_current_pgd;
	96
	97	/* Here is a trick, since mmap.c need the initializer elements for
	98	* protection_map[] to be constant at compile time, I set the following
	99	* to all zeros. I set it to the real values after I link in the
	100	* appropriate MMU page table routines at boot time.
	101	*/
	102	#define __P000 __pgprot(0)
	103	#define __P001 __pgprot(0)
	104	#define __P010 __pgprot(0)
	105	#define __P011 __pgprot(0)
	106	#define __P100 __pgprot(0)
	107	#define __P101 __pgprot(0)
	108	#define __P110 __pgprot(0)
	109	#define __P111 __pgprot(0)
	110
	111	#define __S000 __pgprot(0)
	112	#define __S001 __pgprot(0)
	113	#define __S010 __pgprot(0)
	114	#define __S011 __pgprot(0)
	115	#define __S100 __pgprot(0)
	116	#define __S101 __pgprot(0)
	117	#define __S110 __pgprot(0)
	118	#define __S111 __pgprot(0)
	119
	120	extern int num_contexts;
	121
	122	/* First physical page can be anywhere, the following is needed so that
	123	* va-->pa and vice versa conversions work properly without performance
	124	* hit for all __pa()/__va() operations.
	125	*/
	126	extern unsigned long phys_base;
	127	extern unsigned long pfn_base;
	128
	129	/*
	130	* BAD_PAGETABLE is used when we need a bogus page-table, while
	131	* BAD_PAGE is used for a bogus page.
	132	*
	133	* ZERO_PAGE is a global shared page that is always zero: used
	134	* for zero-mapped memory areas etc..
	135	*/
	136	extern pte_t * __bad_pagetable(void);
	137	extern pte_t __bad_page(void);
	138	extern unsigned long empty_zero_page;
	139
	140	#define BAD_PAGETABLE __bad_pagetable()
	141	#define BAD_PAGE __bad_page()
	142	#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
	143
	144	/*
	145	*/
	146	BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
	147	BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page, pgd_t)
	148
	149	#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
	150	#define pgd_page(pgd) BTFIXUP_CALL(pgd_page)(pgd)
151
152	BTFIXUPDEF_SETHI(none_mask)
153	BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
154	BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
155	BTFIXUPDEF_CALL(int, pte_read, pte_t)
156
3115624e	157	static inline int pte_none(pte_t pte)
1da177e4 LT	158	{
	159	return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
	160	}
	161
	162	#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
	163	#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
	164	#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte)
	165
	166	BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
	167	BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
	168	BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
	169
3115624e	170	static inline int pmd_none(pmd_t pmd)
1da177e4 LT	171	{
	172	return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
	173	}
	174
	175	#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
	176	#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
	177	#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
	178
	179	BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
	180	BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
	181	BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
	182	BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
	183
	184	#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
	185	#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
	186	#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
	187	#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
	188
	189	/*
	190	* The following only work if pte_present() is true.
	191	* Undefined behaviour if not..
	192	*/
	193	BTFIXUPDEF_HALF(pte_writei)
	194	BTFIXUPDEF_HALF(pte_dirtyi)
	195	BTFIXUPDEF_HALF(pte_youngi)
	196
	197	extern int pte_write(pte_t pte) __attribute_const__;
3115624e	198	static inline int pte_write(pte_t pte)
1da177e4 LT	199	{
	200	return pte_val(pte) & BTFIXUP_HALF(pte_writei);
	201	}
	202
	203	extern int pte_dirty(pte_t pte) __attribute_const__;
3115624e	204	static inline int pte_dirty(pte_t pte)
1da177e4 LT	205	{
	206	return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
	207	}
	208
	209	extern int pte_young(pte_t pte) __attribute_const__;
3115624e	210	static inline int pte_young(pte_t pte)
1da177e4 LT	211	{
	212	return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
	213	}
	214
	215	/*
	216	* The following only work if pte_present() is not true.
	217	*/
	218	BTFIXUPDEF_HALF(pte_filei)
	219
	220	extern int pte_file(pte_t pte) __attribute_const__;
3115624e	221	static inline int pte_file(pte_t pte)
1da177e4 LT	222	{
	223	return pte_val(pte) & BTFIXUP_HALF(pte_filei);
	224	}
	225
	226	/*
	227	*/
	228	BTFIXUPDEF_HALF(pte_wrprotecti)
	229	BTFIXUPDEF_HALF(pte_mkcleani)
	230	BTFIXUPDEF_HALF(pte_mkoldi)
	231
	232	extern pte_t pte_wrprotect(pte_t pte) __attribute_const__;
3115624e	233	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	234	{
	235	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
	236	}
	237
	238	extern pte_t pte_mkclean(pte_t pte) __attribute_const__;
3115624e	239	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	240	{
	241	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
	242	}
	243
	244	extern pte_t pte_mkold(pte_t pte) __attribute_const__;
3115624e	245	static inline pte_t pte_mkold(pte_t pte)
1da177e4 LT	246	{
	247	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
	248	}
	249
	250	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
	251	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
	252	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
	253
	254	#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
	255	#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
	256	#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
	257
	258	#define page_pte_prot(page, prot) mk_pte(page, prot)
	259	#define page_pte(page) mk_pte(page, __pgprot(0))
	260	#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
	261
	262	BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
	263	#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
	264	#define pte_page(pte) pfn_to_page(pte_pfn(pte))
	265
	266	/*
	267	* Conversion functions: convert a page and protection to a page entry,
	268	* and a page entry and page directory to the page they refer to.
	269	*/
	270	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
	271
	272	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
	273	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
	274
	275	#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
	276	#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
	277	#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
	278
	279	BTFIXUPDEF_INT(pte_modify_mask)
	280
	281	extern pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
3115624e	282	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	283	{
	284	return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) \|
	285	pgprot_val(newprot));
	286	}
	287
	288	#define pgd_index(address) ((address) >> PGDIR_SHIFT)
	289
	290	/* to find an entry in a page-table-directory */
	291	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
	292
	293	/* to find an entry in a kernel page-table-directory */
	294	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	295
	296	/* Find an entry in the second-level page table.. */
	297	BTFIXUPDEF_CALL(pmd_t , pmd_offset, pgd_t , unsigned long)
	298	#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
	299
	300	/* Find an entry in the third-level page table.. */
	301	BTFIXUPDEF_CALL(pte_t , pte_offset_kernel, pmd_t , unsigned long)
	302	#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
	303
	304	/*
	305	* This shortcut works on sun4m (and sun4d) because the nocache area is static,
	306	* and sun4c is guaranteed to have no highmem anyway.
	307	*/
	308	#define pte_offset_map(d, a) pte_offset_kernel(d,a)
	309	#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
	310
	311	#define pte_unmap(pte) do{}while(0)
	312	#define pte_unmap_nested(pte) do{}while(0)
	313
	314	/* The permissions for pgprot_val to make a page mapped on the obio space */
	315	extern unsigned int pg_iobits;
	316
	317	/* Certain architectures need to do special things when pte's
	318	* within a page table are directly modified. Thus, the following
	319	* hook is made available.
	320	*/
	321
	322	BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
	323
	324	#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
	325	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	326
	327	struct seq_file;
	328	BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
	329
	330	#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
	331
	332	/* Fault handler stuff... */
	333	#define FAULT_CODE_PROT 0x1
	334	#define FAULT_CODE_WRITE 0x2
	335	#define FAULT_CODE_USER 0x4
	336
	337	BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
	338
	339	#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
	340
	341	BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
	342	unsigned long, unsigned int)
	343	BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
	344	#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
	345	#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
	346
347	extern int invalid_segment;
348
349	/* Encode and de-code a swap entry */
350	BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
351	BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
352	BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
353
354	#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
355	#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
356	#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
357
358	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
359	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
360
361	/* file-offset-in-pte helpers */
362	BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
363	BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
364
365	#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
366	#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
367
368	/*
369	* This is made a constant because mm/fremap.c required a constant.
370	* Note that layout of these bits is different between sun4c.c and srmmu.c.
371	*/
372	#define PTE_FILE_MAX_BITS 24
373
374	/*
375	*/
376	struct ctx_list {
377	struct ctx_list *next;
378	struct ctx_list *prev;
379	unsigned int ctx_number;
380	struct mm_struct *ctx_mm;
381	};
382
383	extern struct ctx_list ctx_list_pool; / Dynamically allocated */
384	extern struct ctx_list ctx_free; /* Head of free list */
385	extern struct ctx_list ctx_used; /* Head of used contexts list */
386
387	#define NO_CONTEXT -1
388
3115624e	389	static inline void remove_from_ctx_list(struct ctx_list *entry)
1da177e4 LT	390	{
	391	entry->next->prev = entry->prev;
	392	entry->prev->next = entry->next;
	393	}
	394
3115624e	395	static inline void add_to_ctx_list(struct ctx_list head, struct ctx_list entry)
1da177e4 LT	396	{
	397	entry->next = head;
	398	(entry->prev = head->prev)->next = entry;
	399	head->prev = entry;
	400	}
	401	#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
	402	#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
	403
3115624e	404	static inline unsigned long
1da177e4 LT	405	__get_phys (unsigned long addr)
	406	{
	407	switch (sparc_cpu_model){
	408	case sun4:
	409	case sun4c:
	410	return sun4c_get_pte (addr) << PAGE_SHIFT;
	411	case sun4m:
	412	case sun4d:
	413	return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
	414	default:
	415	return 0;
	416	}
	417	}
	418
3115624e	419	static inline int
1da177e4 LT	420	__get_iospace (unsigned long addr)
	421	{
	422	switch (sparc_cpu_model){
	423	case sun4:
	424	case sun4c:
	425	return -1; /* Don't check iospace on sun4c */
	426	case sun4m:
	427	case sun4d:
	428	return (srmmu_get_pte (addr) >> 28);
	429	default:
	430	return -1;
	431	}
	432	}
	433
	434	extern unsigned long *sparc_valid_addr_bitmap;
	435
	436	/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
	437	#define kern_addr_valid(addr) \
	438	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
	439
1da177e4 LT	440	extern int io_remap_pfn_range(struct vm_area_struct *vma,
	441	unsigned long from, unsigned long pfn,
	442	unsigned long size, pgprot_t prot);
	443
	444	/*
	445	* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
	446	* its high 4 bits. These macros/functions put it there or get it from there.
	447	*/
	448	#define MK_IOSPACE_PFN(space, pfn) (pfn \| (space << (BITS_PER_LONG - 4)))
	449	#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
	450	#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
	451
	452	#include <asm-generic/pgtable.h>
	453
	454	#endif /* !(__ASSEMBLY__) */
	455
	456	/* We provide our own get_unmapped_area to cope with VA holes for userland */
	457	#define HAVE_ARCH_UNMAPPED_AREA
	458
	459	/*
	460	* No page table caches to initialise
	461	*/
	462	#define pgtable_cache_init() do { } while (0)
	463
	464	#endif /* !(_SPARC_PGTABLE_H) */