[mirror_ubuntu-artful-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/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_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 *)
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)

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);
}

/*
 */
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 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,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
1da177e4 LT	14	#include <linux/spinlock.h>
	15	#include <linux/swap.h>
	16	#include <asm/types.h>
	17	#ifdef CONFIG_SUN4
	18	#include <asm/pgtsun4.h>
	19	#else
	20	#include <asm/pgtsun4c.h>
	21	#endif
	22	#include <asm/pgtsrmmu.h>
	23	#include <asm/vac-ops.h>
	24	#include <asm/oplib.h>
	25	#include <asm/btfixup.h>
	26	#include <asm/system.h>
	27
	28	#ifndef __ASSEMBLY__
	29
	30	struct vm_area_struct;
	31	struct page;
	32
	33	extern void load_mmu(void);
	34	extern unsigned long calc_highpages(void);
	35
	36	BTFIXUPDEF_SIMM13(pgdir_shift)
	37	BTFIXUPDEF_SETHI(pgdir_size)
	38	BTFIXUPDEF_SETHI(pgdir_mask)
	39
	40	BTFIXUPDEF_SIMM13(ptrs_per_pmd)
	41	BTFIXUPDEF_SIMM13(ptrs_per_pgd)
	42	BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
	43
	44	#define pte_ERROR(e) __builtin_trap()
	45	#define pmd_ERROR(e) __builtin_trap()
	46	#define pgd_ERROR(e) __builtin_trap()
	47
	48	BTFIXUPDEF_INT(page_none)
	49	BTFIXUPDEF_INT(page_shared)
	50	BTFIXUPDEF_INT(page_copy)
	51	BTFIXUPDEF_INT(page_readonly)
	52	BTFIXUPDEF_INT(page_kernel)
	53
	54	#define PMD_SHIFT SUN4C_PMD_SHIFT
	55	#define PMD_SIZE (1UL << PMD_SHIFT)
	56	#define PMD_MASK (~(PMD_SIZE-1))
	57	#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
	58	#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
	59	#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
	60	#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
	61	#define PTRS_PER_PTE 1024
	62	#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
	63	#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
	64	#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
d455a369	65	#define FIRST_USER_ADDRESS 0
1da177e4 LT	66	#define PTE_SIZE (PTRS_PER_PTE*4)
	67
	68	#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
	69	#define PAGE_SHARED __pgprot(BTFIXUP_INT(page_shared))
	70	#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
	71	#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
	72
	73	extern unsigned long page_kernel;
	74
	75	#ifdef MODULE
	76	#define PAGE_KERNEL page_kernel
	77	#else
	78	#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
	79	#endif
	80
	81	/* Top-level page directory */
	82	extern pgd_t swapper_pg_dir[1024];
	83
801ab3c7 DM	84	extern void paging_init(void);
801ab3c7 DM	85
1da177e4 LT	86	/* Page table for 0-4MB for everybody, on the Sparc this
	87	* holds the same as on the i386.
	88	*/
	89	extern pte_t pg0[1024];
	90	extern pte_t pg1[1024];
	91	extern pte_t pg2[1024];
	92	extern pte_t pg3[1024];
	93
	94	extern unsigned long ptr_in_current_pgd;
	95
	96	/* Here is a trick, since mmap.c need the initializer elements for
	97	* protection_map[] to be constant at compile time, I set the following
	98	* to all zeros. I set it to the real values after I link in the
	99	* appropriate MMU page table routines at boot time.
	100	*/
	101	#define __P000 __pgprot(0)
	102	#define __P001 __pgprot(0)
	103	#define __P010 __pgprot(0)
	104	#define __P011 __pgprot(0)
	105	#define __P100 __pgprot(0)
	106	#define __P101 __pgprot(0)
	107	#define __P110 __pgprot(0)
	108	#define __P111 __pgprot(0)
	109
	110	#define __S000 __pgprot(0)
	111	#define __S001 __pgprot(0)
	112	#define __S010 __pgprot(0)
	113	#define __S011 __pgprot(0)
	114	#define __S100 __pgprot(0)
	115	#define __S101 __pgprot(0)
	116	#define __S110 __pgprot(0)
	117	#define __S111 __pgprot(0)
	118
	119	extern int num_contexts;
	120
	121	/* First physical page can be anywhere, the following is needed so that
	122	* va-->pa and vice versa conversions work properly without performance
	123	* hit for all __pa()/__va() operations.
	124	*/
	125	extern unsigned long phys_base;
	126	extern unsigned long pfn_base;
	127
	128	/*
	129	* BAD_PAGETABLE is used when we need a bogus page-table, while
	130	* BAD_PAGE is used for a bogus page.
	131	*
	132	* ZERO_PAGE is a global shared page that is always zero: used
	133	* for zero-mapped memory areas etc..
	134	*/
	135	extern pte_t * __bad_pagetable(void);
	136	extern pte_t __bad_page(void);
	137	extern unsigned long empty_zero_page;
	138
	139	#define BAD_PAGETABLE __bad_pagetable()
	140	#define BAD_PAGE __bad_page()
	141	#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
	142
	143	/*
	144	*/
	145	BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
46a82b2d	146	BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
1da177e4 LT	147
1da177e4 LT	148	#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
46a82b2d	149	#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
1da177e4 LT	150
	151	BTFIXUPDEF_SETHI(none_mask)
	152	BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
	153	BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
	154	BTFIXUPDEF_CALL(int, pte_read, pte_t)
	155
3115624e	156	static inline int pte_none(pte_t pte)
1da177e4 LT	157	{
	158	return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
	159	}
	160
	161	#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
	162	#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
	163	#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte)
	164
	165	BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
	166	BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
	167	BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
	168
3115624e	169	static inline int pmd_none(pmd_t pmd)
1da177e4 LT	170	{
	171	return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
	172	}
	173
	174	#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
	175	#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
	176	#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
	177
	178	BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
	179	BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
	180	BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
	181	BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
	182
	183	#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
	184	#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
	185	#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
	186	#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
	187
	188	/*
	189	* The following only work if pte_present() is true.
	190	* Undefined behaviour if not..
	191	*/
	192	BTFIXUPDEF_HALF(pte_writei)
	193	BTFIXUPDEF_HALF(pte_dirtyi)
	194	BTFIXUPDEF_HALF(pte_youngi)
	195
329d4dd7	196	static int pte_write(pte_t pte) __attribute_const__;
3115624e	197	static inline int pte_write(pte_t pte)
1da177e4 LT	198	{
	199	return pte_val(pte) & BTFIXUP_HALF(pte_writei);
	200	}
	201
329d4dd7	202	static int pte_dirty(pte_t pte) __attribute_const__;
3115624e	203	static inline int pte_dirty(pte_t pte)
1da177e4 LT	204	{
	205	return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
	206	}
	207
329d4dd7	208	static int pte_young(pte_t pte) __attribute_const__;
3115624e	209	static inline int pte_young(pte_t pte)
1da177e4 LT	210	{
	211	return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
	212	}
	213
	214	/*
	215	* The following only work if pte_present() is not true.
	216	*/
	217	BTFIXUPDEF_HALF(pte_filei)
	218
329d4dd7	219	static int pte_file(pte_t pte) __attribute_const__;
3115624e	220	static inline int pte_file(pte_t pte)
1da177e4 LT	221	{
	222	return pte_val(pte) & BTFIXUP_HALF(pte_filei);
	223	}
	224
	225	/*
	226	*/
	227	BTFIXUPDEF_HALF(pte_wrprotecti)
	228	BTFIXUPDEF_HALF(pte_mkcleani)
	229	BTFIXUPDEF_HALF(pte_mkoldi)
	230
329d4dd7	231	static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
3115624e	232	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	233	{
	234	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
	235	}
	236
329d4dd7	237	static pte_t pte_mkclean(pte_t pte) __attribute_const__;
3115624e	238	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	239	{
	240	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
	241	}
	242
329d4dd7	243	static pte_t pte_mkold(pte_t pte) __attribute_const__;
3115624e	244	static inline pte_t pte_mkold(pte_t pte)
1da177e4 LT	245	{
	246	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
	247	}
	248
	249	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
	250	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
	251	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
	252
	253	#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
	254	#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
	255	#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
	256
1da177e4 LT	257	#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
	258
	259	BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
	260	#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
	261	#define pte_page(pte) pfn_to_page(pte_pfn(pte))
	262
	263	/*
	264	* Conversion functions: convert a page and protection to a page entry,
	265	* and a page entry and page directory to the page they refer to.
	266	*/
	267	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
	268
	269	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
	270	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
14778d90	271	BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
1da177e4 LT	272
	273	#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
	274	#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
	275	#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
	276
14778d90 DM	277	#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
14778d90 DM	278
1da177e4 LT	279	BTFIXUPDEF_INT(pte_modify_mask)
1da177e4 LT	280
329d4dd7	281	static 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
1da177e4 LT	314	/* Certain architectures need to do special things when pte's
	315	* within a page table are directly modified. Thus, the following
	316	* hook is made available.
	317	*/
	318
	319	BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
	320
	321	#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
	322	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	323
	324	struct seq_file;
	325	BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
	326
	327	#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
	328
	329	/* Fault handler stuff... */
	330	#define FAULT_CODE_PROT 0x1
	331	#define FAULT_CODE_WRITE 0x2
	332	#define FAULT_CODE_USER 0x4
	333
	334	BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
	335
	336	#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
	337
	338	BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
	339	unsigned long, unsigned int)
	340	BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
	341	#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
	342	#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
	343
	344	extern int invalid_segment;
	345
	346	/* Encode and de-code a swap entry */
	347	BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
	348	BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
	349	BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
	350
	351	#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
	352	#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
	353	#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
	354
	355	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	356	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	357
	358	/* file-offset-in-pte helpers */
	359	BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
	360	BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
	361
	362	#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
	363	#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
	364
	365	/*
	366	* This is made a constant because mm/fremap.c required a constant.
	367	* Note that layout of these bits is different between sun4c.c and srmmu.c.
	368	*/
	369	#define PTE_FILE_MAX_BITS 24
	370
	371	/*
	372	*/
	373	struct ctx_list {
	374	struct ctx_list *next;
	375	struct ctx_list *prev;
	376	unsigned int ctx_number;
	377	struct mm_struct *ctx_mm;
378	};
379
380	extern struct ctx_list ctx_list_pool; / Dynamically allocated */
381	extern struct ctx_list ctx_free; /* Head of free list */
382	extern struct ctx_list ctx_used; /* Head of used contexts list */
383
384	#define NO_CONTEXT -1
385
3115624e	386	static inline void remove_from_ctx_list(struct ctx_list *entry)
1da177e4 LT	387	{
	388	entry->next->prev = entry->prev;
	389	entry->prev->next = entry->next;
	390	}
	391
3115624e	392	static inline void add_to_ctx_list(struct ctx_list head, struct ctx_list entry)
1da177e4 LT	393	{
	394	entry->next = head;
	395	(entry->prev = head->prev)->next = entry;
	396	head->prev = entry;
	397	}
	398	#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
	399	#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
	400
3115624e	401	static inline unsigned long
1da177e4 LT	402	__get_phys (unsigned long addr)
	403	{
	404	switch (sparc_cpu_model){
	405	case sun4:
	406	case sun4c:
	407	return sun4c_get_pte (addr) << PAGE_SHIFT;
	408	case sun4m:
	409	case sun4d:
	410	return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
	411	default:
	412	return 0;
	413	}
	414	}
	415
3115624e	416	static inline int
1da177e4 LT	417	__get_iospace (unsigned long addr)
	418	{
	419	switch (sparc_cpu_model){
	420	case sun4:
	421	case sun4c:
	422	return -1; /* Don't check iospace on sun4c */
	423	case sun4m:
	424	case sun4d:
	425	return (srmmu_get_pte (addr) >> 28);
	426	default:
	427	return -1;
	428	}
	429	}
	430
	431	extern unsigned long *sparc_valid_addr_bitmap;
	432
	433	/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
	434	#define kern_addr_valid(addr) \
	435	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
	436
1da177e4 LT	437	extern int io_remap_pfn_range(struct vm_area_struct *vma,
	438	unsigned long from, unsigned long pfn,
	439	unsigned long size, pgprot_t prot);
	440
	441	/*
	442	* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
	443	* its high 4 bits. These macros/functions put it there or get it from there.
	444	*/
	445	#define MK_IOSPACE_PFN(space, pfn) (pfn \| (space << (BITS_PER_LONG - 4)))
	446	#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
	447	#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
	448
	449	#include <asm-generic/pgtable.h>
	450
	451	#endif /* !(__ASSEMBLY__) */
	452
	453	/* We provide our own get_unmapped_area to cope with VA holes for userland */
	454	#define HAVE_ARCH_UNMAPPED_AREA
	455
	456	/*
	457	* No page table caches to initialise
	458	*/
	459	#define pgtable_cache_init() do { } while (0)
	460
	461	#endif /* !(_SPARC_PGTABLE_H) */