[deliverable/linux.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_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,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)

#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__) */

/* 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)
1da177e4 LT	49	BTFIXUPDEF_INT(page_copy)
	50	BTFIXUPDEF_INT(page_readonly)
	51	BTFIXUPDEF_INT(page_kernel)
	52
	53	#define PMD_SHIFT SUN4C_PMD_SHIFT
	54	#define PMD_SIZE (1UL << PMD_SHIFT)
	55	#define PMD_MASK (~(PMD_SIZE-1))
	56	#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
	57	#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
	58	#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
	59	#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
	60	#define PTRS_PER_PTE 1024
	61	#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
	62	#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
	63	#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
d455a369	64	#define FIRST_USER_ADDRESS 0
1da177e4 LT	65	#define PTE_SIZE (PTRS_PER_PTE*4)
	66
	67	#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
378e515c	68	extern pgprot_t PAGE_SHARED;
1da177e4 LT	69	#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
	70	#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
	71
	72	extern unsigned long page_kernel;
	73
	74	#ifdef MODULE
	75	#define PAGE_KERNEL page_kernel
	76	#else
	77	#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
	78	#endif
	79
	80	/* Top-level page directory */
	81	extern pgd_t swapper_pg_dir[1024];
	82
801ab3c7 DM	83	extern void paging_init(void);
801ab3c7 DM	84
1da177e4 LT	85	/* Page table for 0-4MB for everybody, on the Sparc this
	86	* holds the same as on the i386.
	87	*/
	88	extern pte_t pg0[1024];
	89	extern pte_t pg1[1024];
	90	extern pte_t pg2[1024];
	91	extern pte_t pg3[1024];
	92
	93	extern unsigned long ptr_in_current_pgd;
	94
	95	/* Here is a trick, since mmap.c need the initializer elements for
	96	* protection_map[] to be constant at compile time, I set the following
	97	* to all zeros. I set it to the real values after I link in the
	98	* appropriate MMU page table routines at boot time.
	99	*/
	100	#define __P000 __pgprot(0)
	101	#define __P001 __pgprot(0)
	102	#define __P010 __pgprot(0)
	103	#define __P011 __pgprot(0)
	104	#define __P100 __pgprot(0)
	105	#define __P101 __pgprot(0)
	106	#define __P110 __pgprot(0)
	107	#define __P111 __pgprot(0)
	108
	109	#define __S000 __pgprot(0)
	110	#define __S001 __pgprot(0)
	111	#define __S010 __pgprot(0)
	112	#define __S011 __pgprot(0)
	113	#define __S100 __pgprot(0)
	114	#define __S101 __pgprot(0)
	115	#define __S110 __pgprot(0)
	116	#define __S111 __pgprot(0)
	117
	118	extern int num_contexts;
	119
	120	/* First physical page can be anywhere, the following is needed so that
	121	* va-->pa and vice versa conversions work properly without performance
	122	* hit for all __pa()/__va() operations.
	123	*/
	124	extern unsigned long phys_base;
	125	extern unsigned long pfn_base;
	126
	127	/*
	128	* BAD_PAGETABLE is used when we need a bogus page-table, while
	129	* BAD_PAGE is used for a bogus page.
	130	*
	131	* ZERO_PAGE is a global shared page that is always zero: used
	132	* for zero-mapped memory areas etc..
	133	*/
	134	extern pte_t * __bad_pagetable(void);
	135	extern pte_t __bad_page(void);
	136	extern unsigned long empty_zero_page;
	137
	138	#define BAD_PAGETABLE __bad_pagetable()
	139	#define BAD_PAGE __bad_page()
	140	#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
	141
	142	/*
	143	*/
	144	BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
46a82b2d	145	BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
1da177e4 LT	146
1da177e4 LT	147	#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
46a82b2d	148	#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
1da177e4 LT	149
	150	BTFIXUPDEF_SETHI(none_mask)
	151	BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
	152	BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
1da177e4	153
3115624e	154	static inline int pte_none(pte_t pte)
1da177e4 LT	155	{
	156	return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
	157	}
	158
	159	#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
	160	#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
1da177e4 LT	161
	162	BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
	163	BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
	164	BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
	165
3115624e	166	static inline int pmd_none(pmd_t pmd)
1da177e4 LT	167	{
	168	return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
	169	}
	170
	171	#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
	172	#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
	173	#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
	174
	175	BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
	176	BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
	177	BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
	178	BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
	179
	180	#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
	181	#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
	182	#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
	183	#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
	184
	185	/*
	186	* The following only work if pte_present() is true.
	187	* Undefined behaviour if not..
	188	*/
	189	BTFIXUPDEF_HALF(pte_writei)
	190	BTFIXUPDEF_HALF(pte_dirtyi)
	191	BTFIXUPDEF_HALF(pte_youngi)
	192
329d4dd7	193	static int pte_write(pte_t pte) __attribute_const__;
3115624e	194	static inline int pte_write(pte_t pte)
1da177e4 LT	195	{
	196	return pte_val(pte) & BTFIXUP_HALF(pte_writei);
	197	}
	198
329d4dd7	199	static int pte_dirty(pte_t pte) __attribute_const__;
3115624e	200	static inline int pte_dirty(pte_t pte)
1da177e4 LT	201	{
	202	return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
	203	}
	204
329d4dd7	205	static int pte_young(pte_t pte) __attribute_const__;
3115624e	206	static inline int pte_young(pte_t pte)
1da177e4 LT	207	{
	208	return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
	209	}
	210
	211	/*
	212	* The following only work if pte_present() is not true.
	213	*/
	214	BTFIXUPDEF_HALF(pte_filei)
	215
329d4dd7	216	static int pte_file(pte_t pte) __attribute_const__;
3115624e	217	static inline int pte_file(pte_t pte)
1da177e4 LT	218	{
	219	return pte_val(pte) & BTFIXUP_HALF(pte_filei);
	220	}
	221
7e675137 NP	222	static inline int pte_special(pte_t pte)
	223	{
	224	return 0;
	225	}
	226
1da177e4 LT	227	/*
	228	*/
	229	BTFIXUPDEF_HALF(pte_wrprotecti)
	230	BTFIXUPDEF_HALF(pte_mkcleani)
	231	BTFIXUPDEF_HALF(pte_mkoldi)
	232
329d4dd7	233	static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
3115624e	234	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	235	{
	236	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
	237	}
	238
329d4dd7	239	static pte_t pte_mkclean(pte_t pte) __attribute_const__;
3115624e	240	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	241	{
	242	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
	243	}
	244
329d4dd7	245	static pte_t pte_mkold(pte_t pte) __attribute_const__;
3115624e	246	static inline pte_t pte_mkold(pte_t pte)
1da177e4 LT	247	{
	248	return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
	249	}
	250
	251	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
	252	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
	253	BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
	254
	255	#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
	256	#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
	257	#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
	258
7e675137 NP	259	#define pte_mkspecial(pte) (pte)
7e675137 NP	260
1da177e4 LT	261	#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
	262
	263	BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
	264	#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
	265	#define pte_page(pte) pfn_to_page(pte_pfn(pte))
	266
	267	/*
	268	* Conversion functions: convert a page and protection to a page entry,
	269	* and a page entry and page directory to the page they refer to.
	270	*/
	271	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
	272
	273	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
	274	BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
14778d90	275	BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
1da177e4 LT	276
	277	#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
	278	#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
	279	#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
	280
14778d90 DM	281	#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
14778d90 DM	282
1da177e4 LT	283	BTFIXUPDEF_INT(pte_modify_mask)
1da177e4 LT	284
329d4dd7	285	static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
3115624e	286	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	287	{
	288	return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) \|
	289	pgprot_val(newprot));
	290	}
	291
	292	#define pgd_index(address) ((address) >> PGDIR_SHIFT)
	293
	294	/* to find an entry in a page-table-directory */
	295	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
	296
	297	/* to find an entry in a kernel page-table-directory */
	298	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	299
	300	/* Find an entry in the second-level page table.. */
	301	BTFIXUPDEF_CALL(pmd_t , pmd_offset, pgd_t , unsigned long)
	302	#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
	303
	304	/* Find an entry in the third-level page table.. */
	305	BTFIXUPDEF_CALL(pte_t , pte_offset_kernel, pmd_t , unsigned long)
	306	#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
	307
	308	/*
	309	* This shortcut works on sun4m (and sun4d) because the nocache area is static,
	310	* and sun4c is guaranteed to have no highmem anyway.
	311	*/
	312	#define pte_offset_map(d, a) pte_offset_kernel(d,a)
	313	#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
	314
	315	#define pte_unmap(pte) do{}while(0)
	316	#define pte_unmap_nested(pte) do{}while(0)
	317
1da177e4 LT	318	/* Certain architectures need to do special things when pte's
	319	* within a page table are directly modified. Thus, the following
	320	* hook is made available.
	321	*/
	322
	323	BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
	324
	325	#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
	326	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	327
	328	struct seq_file;
	329	BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
	330
	331	#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
	332
	333	/* Fault handler stuff... */
	334	#define FAULT_CODE_PROT 0x1
	335	#define FAULT_CODE_WRITE 0x2
	336	#define FAULT_CODE_USER 0x4
	337
	338	BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
	339
	340	#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
	341
	342	BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
	343	unsigned long, unsigned int)
	344	BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
	345	#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
	346	#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
	347
	348	extern int invalid_segment;
	349
	350	/* Encode and de-code a swap entry */
	351	BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
	352	BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
	353	BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
	354
	355	#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
	356	#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
	357	#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
	358
	359	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	360	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	361
	362	/* file-offset-in-pte helpers */
	363	BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
	364	BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
	365
	366	#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
	367	#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
	368
	369	/*
	370	* This is made a constant because mm/fremap.c required a constant.
	371	* Note that layout of these bits is different between sun4c.c and srmmu.c.
	372	*/
	373	#define PTE_FILE_MAX_BITS 24
	374
	375	/*
	376	*/
	377	struct ctx_list {
	378	struct ctx_list *next;
	379	struct ctx_list *prev;
	380	unsigned int ctx_number;
	381	struct mm_struct *ctx_mm;
382	};
383
384	extern struct ctx_list ctx_list_pool; / Dynamically allocated */
385	extern struct ctx_list ctx_free; /* Head of free list */
386	extern struct ctx_list ctx_used; /* Head of used contexts list */
387
388	#define NO_CONTEXT -1
389
3115624e	390	static inline void remove_from_ctx_list(struct ctx_list *entry)
1da177e4 LT	391	{
	392	entry->next->prev = entry->prev;
	393	entry->prev->next = entry->next;
	394	}
	395
3115624e	396	static inline void add_to_ctx_list(struct ctx_list head, struct ctx_list entry)
1da177e4 LT	397	{
	398	entry->next = head;
	399	(entry->prev = head->prev)->next = entry;
	400	head->prev = entry;
	401	}
	402	#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
	403	#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
	404
3115624e	405	static inline unsigned long
1da177e4 LT	406	__get_phys (unsigned long addr)
	407	{
	408	switch (sparc_cpu_model){
	409	case sun4:
	410	case sun4c:
	411	return sun4c_get_pte (addr) << PAGE_SHIFT;
	412	case sun4m:
	413	case sun4d:
	414	return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
	415	default:
	416	return 0;
	417	}
	418	}
	419
3115624e	420	static inline int
1da177e4 LT	421	__get_iospace (unsigned long addr)
	422	{
	423	switch (sparc_cpu_model){
	424	case sun4:
	425	case sun4c:
	426	return -1; /* Don't check iospace on sun4c */
	427	case sun4m:
	428	case sun4d:
	429	return (srmmu_get_pte (addr) >> 28);
	430	default:
	431	return -1;
	432	}
	433	}
	434
	435	extern unsigned long *sparc_valid_addr_bitmap;
	436
	437	/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
	438	#define kern_addr_valid(addr) \
	439	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
	440
1da177e4 LT	441	extern int io_remap_pfn_range(struct vm_area_struct *vma,
	442	unsigned long from, unsigned long pfn,
	443	unsigned long size, pgprot_t prot);
	444
	445	/*
	446	* For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
	447	* its high 4 bits. These macros/functions put it there or get it from there.
	448	*/
	449	#define MK_IOSPACE_PFN(space, pfn) (pfn \| (space << (BITS_PER_LONG - 4)))
	450	#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
	451	#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
	452
8dab5241 BH	453	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
	454	#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
	455	({ \
	456	int __changed = !pte_same(*(__ptep), __entry); \
	457	if (__changed) { \
	458	set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
	459	flush_tlb_page(__vma, __address); \
	460	} \
	461	(sparc_cpu_model == sun4c) \|\| __changed; \
	462	})
	463
1da177e4 LT	464	#include <asm-generic/pgtable.h>
	465
	466	#endif /* !(__ASSEMBLY__) */
	467
	468	/* We provide our own get_unmapped_area to cope with VA holes for userland */
	469	#define HAVE_ARCH_UNMAPPED_AREA
	470
	471	/*
	472	* No page table caches to initialise
	473	*/
	474	#define pgtable_cache_init() do { } while (0)
	475
	476	#endif /* !(_SPARC_PGTABLE_H) */