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#ifndef _M68K_PGTABLE_H

#define _M68K_PGTABLE_H

#include <linux/config.h>

#include <asm/setup.h>

#ifndef __ASSEMBLY__

#include <asm/processor.h>

#include <linux/threads.h>

/*

 * This file contains the functions and defines necessary to modify and use

 * the m68k page table tree.

 */

#include <asm/virtconvert.h>

/* Certain architectures need to do special things when pte's

 * within a page table are directly modified.  Thus, the following

 * hook is made available.

 */

#define set_pte(pteptr, pteval)                                 \

        do{                                                     \

                *(pteptr) = (pteval);                           \

        } while(0)

/* PMD_SHIFT determines the size of the area a second-level page table can map */

#ifdef CONFIG_SUN3

#define PMD_SHIFT       17

#else

#define PMD_SHIFT       22

#endif

#define PMD_SIZE        (1UL << PMD_SHIFT)

#define PMD_MASK        (~(PMD_SIZE-1))

/* PGDIR_SHIFT determines what a third-level page table entry can map */

#ifdef CONFIG_SUN3

#define PGDIR_SHIFT     17

#else

#define PGDIR_SHIFT     25

#endif

#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)

#define PGDIR_MASK      (~(PGDIR_SIZE-1))

/*

 * entries per page directory level: the m68k is configured as three-level,

 * so we do have PMD level physically.

 */

#ifdef CONFIG_SUN3

#define PTRS_PER_PTE   16

#define PTRS_PER_PMD   1

#define PTRS_PER_PGD   2048

#else

#define PTRS_PER_PTE    1024

#define PTRS_PER_PMD    8

#define PTRS_PER_PGD    128

#endif

#define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)

#define FIRST_USER_PGD_NR       0

/* Virtual address region for use by kernel_map() */

#ifdef CONFIG_SUN3

#define KMAP_START     0x0DC00000

#define KMAP_END       0x0E000000

#else

#define KMAP_START      0xd0000000

#define KMAP_END        0xf0000000

#endif

#ifndef CONFIG_SUN3

/* Just any arbitrary offset to the start of the vmalloc VM area: the

 * current 8MB value just means that there will be a 8MB "hole" after the

 * physical memory until the kernel virtual memory starts.  That means that

 * any out-of-bounds memory accesses will hopefully be caught.

 * The vmalloc() routines leaves a hole of 4kB between each vmalloced

 * area for the same reason. ;)

 */

#define VMALLOC_OFFSET  (8*1024*1024)

#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))

#define VMALLOC_VMADDR(x) ((unsigned long)(x))

#define VMALLOC_END KMAP_START

#else

extern unsigned long vmalloc_end;

#define VMALLOC_START 0x0f800000

#define VMALLOC_VMADDR(x) ((unsigned long)(x))

#define VMALLOC_END vmalloc_end

#endif /* CONFIG_SUN3 */

/* zero page used for uninitialized stuff */

extern unsigned long empty_zero_page;

/*

 * 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_page(void);

extern pte_t * __bad_pagetable(void);

#define BAD_PAGETABLE __bad_pagetable()

#define BAD_PAGE __bad_page()

#define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))

/* number of bits that fit into a memory pointer */

#define BITS_PER_PTR                    (8*sizeof(unsigned long))

/* to align the pointer to a pointer address */

#define PTR_MASK                        (~(sizeof(void*)-1))

/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */

/* 64-bit machines, beware!  SRB. */

#define SIZEOF_PTR_LOG2                        2

/*

 * Check if the addr/len goes up to the end of a physical

 * memory chunk.  Used for DMA functions.

 */

#ifdef CONFIG_SINGLE_MEMORY_CHUNK

/*

 * It makes no sense to consider whether we cross a memory boundary if

 * we support just one physical chunk of memory.

 */

static inline int mm_end_of_chunk(unsigned long addr, int len)

{

        return 0;

}

#else

int mm_end_of_chunk (unsigned long addr, int len);

#endif

extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);

/*

 * The m68k doesn't have any external MMU info: the kernel page

 * tables contain all the necessary information.  The Sun3 does, but

 * they are updated on demand.

 */

static inline void update_mmu_cache(struct vm_area_struct *vma,

                                    unsigned long address, pte_t pte)

{

}

#ifdef CONFIG_SUN3

/* Macros to (de)construct the fake PTEs representing swap pages. */

#define SWP_TYPE(x)                ((x).val & 0x7F)

#define SWP_OFFSET(x)      (((x).val) >> 7)

#define SWP_ENTRY(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })

#define pte_to_swp_entry(pte)           ((swp_entry_t) { pte_val(pte) })

#define swp_entry_to_pte(x)             ((pte_t) { (x).val })

#else

/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */

#define SWP_TYPE(x)                     (((x).val >> 3) & 0x1ff)

#define SWP_OFFSET(x)                   ((x).val >> 12)

#define SWP_ENTRY(type, offset)         ((swp_entry_t) { ((type) << 3) | ((offset) << 12) })

#define pte_to_swp_entry(pte)           ((swp_entry_t) { pte_val(pte) })

#define swp_entry_to_pte(x)             ((pte_t) { (x).val })

#endif /* CONFIG_SUN3 */

#endif /* !__ASSEMBLY__ */

/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */

#define PageSkip(page)          (0)

#define kern_addr_valid(addr)   (1)

#define io_remap_page_range remap_page_range

/* MMU-specific headers */

#ifdef CONFIG_SUN3

#include <asm/sun3_pgtable.h>

#else

#include <asm/motorola_pgtable.h>

#endif

#ifndef __ASSEMBLY__

#include <asm-generic/pgtable.h>

#endif /* !__ASSEMBLY__ */

/*

 * No page table caches to initialise

 */

#define pgtable_cache_init()    do { } while (0)

#endif /* _M68K_PGTABLE_H */