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/*  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>
#ifdef CONFIG_SUN4
#include <asm/pgtsun4.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);



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


#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 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
#define PAGE_KERNEL    __pgprot(BTFIXUP_INT(page_kernel))

/* 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_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..

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.

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;


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)


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)) |

#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);
            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);
            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 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 */

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

#endif /* !(_SPARC_PGTABLE_H) */

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