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/* $Id: page.h,v 1.1.1.1 2004-04-15 02:40:32 phoenix Exp $

 * page.h:  Various defines and such for MMU operations on the Sparc for

 *          the Linux kernel.

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 */

#ifndef _SPARC_PAGE_H

#define _SPARC_PAGE_H

#include <linux/config.h>

#ifdef CONFIG_SUN4

#define PAGE_SHIFT   13

#else

#define PAGE_SHIFT   12

#endif

#ifndef __ASSEMBLY__

/* I have my suspicions... -DaveM */

#define PAGE_SIZE    (1UL << PAGE_SHIFT)

#else

#define PAGE_SIZE    (1 << PAGE_SHIFT)

#endif

#define PAGE_MASK    (~(PAGE_SIZE-1))

#ifdef __KERNEL__

#include <asm/head.h>       /* for KERNBASE */

#include <asm/btfixup.h>

/* This is always 2048*sizeof(long), doesn't change with PAGE_SIZE */

#define TASK_UNION_SIZE         8192

#ifndef __ASSEMBLY__

/*

 * XXX I am hitting compiler bugs with __builtin_trap. This has

 * hit me before and rusty was blaming his netfilter bugs on

 * this so lets disable it. - Anton

 */

#if 0

/* We need the mb()'s so we don't trigger a compiler bug - Anton */

#define BUG() do { \

        mb(); \

        __builtin_trap(); \

        mb(); \

} while(0)

#else

#define BUG() do { \

        printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; \

} while (0)

#endif

#define PAGE_BUG(page)  BUG()

#define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)

#define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)

#define clear_user_page(page, vaddr)    clear_page(page)

#define copy_user_page(to, from, vaddr) copy_page(to, from)

/* The following structure is used to hold the physical

 * memory configuration of the machine.  This is filled in

 * probe_memory() and is later used by mem_init() to set up

 * mem_map[].  We statically allocate SPARC_PHYS_BANKS of

 * these structs, this is arbitrary.  The entry after the

 * last valid one has num_bytes==0.

 */

struct sparc_phys_banks {

  unsigned long base_addr;

  unsigned long num_bytes;

};

#define SPARC_PHYS_BANKS 32

extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];

/* Cache alias structure.  Entry is valid if context != -1. */

struct cache_palias {

        unsigned long vaddr;

        int context;

};

extern struct cache_palias *sparc_aliases;

/* passing structs on the Sparc slow us down tremendously... */

/* #define STRICT_MM_TYPECHECKS */

#ifdef STRICT_MM_TYPECHECKS

/*

 * These are used to make use of C type-checking..

 */

typedef struct { unsigned long pte; } pte_t;

typedef struct { unsigned long iopte; } iopte_t;

typedef struct { unsigned long pmd; } pmd_t;

typedef struct { unsigned long pgd; } pgd_t;

typedef struct { unsigned long ctxd; } ctxd_t;

typedef struct { unsigned long pgprot; } pgprot_t;

typedef struct { unsigned long iopgprot; } iopgprot_t;

#define pte_val(x)      ((x).pte)

#define iopte_val(x)    ((x).iopte)

#define pmd_val(x)      ((x).pmd)

#define pgd_val(x)      ((x).pgd)

#define ctxd_val(x)     ((x).ctxd)

#define pgprot_val(x)   ((x).pgprot)

#define iopgprot_val(x) ((x).iopgprot)

#define __pte(x)        ((pte_t) { (x) } )

#define __iopte(x)      ((iopte_t) { (x) } )

#define __pmd(x)        ((pmd_t) { (x) } )

#define __pgd(x)        ((pgd_t) { (x) } )

#define __ctxd(x)       ((ctxd_t) { (x) } )

#define __pgprot(x)     ((pgprot_t) { (x) } )

#define __iopgprot(x)   ((iopgprot_t) { (x) } )

#else

/*

 * .. while these make it easier on the compiler

 */

typedef unsigned long pte_t;

typedef unsigned long iopte_t;

typedef unsigned long pmd_t;

typedef unsigned long pgd_t;

typedef unsigned long ctxd_t;

typedef unsigned long pgprot_t;

typedef unsigned long iopgprot_t;

#define pte_val(x)      (x)

#define iopte_val(x)    (x)

#define pmd_val(x)      (x)

#define pgd_val(x)      (x)

#define ctxd_val(x)     (x)

#define pgprot_val(x)   (x)

#define iopgprot_val(x) (x)

#define __pte(x)        (x)

#define __iopte(x)      (x)

#define __pmd(x)        (x)

#define __pgd(x)        (x)

#define __ctxd(x)       (x)

#define __pgprot(x)     (x)

#define __iopgprot(x)   (x)

#endif

extern unsigned long sparc_unmapped_base;

BTFIXUPDEF_SETHI(sparc_unmapped_base)

#define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)

/* Pure 2^n version of get_order */

extern __inline__ int get_order(unsigned long size)

{

        int order;

        size = (size-1) >> (PAGE_SHIFT-1);

        order = -1;

        do {

                size >>= 1;

                order++;

        } while (size);

        return order;

}

#else /* !(__ASSEMBLY__) */

#define __pgprot(x)     (x)

#endif /* !(__ASSEMBLY__) */

/* to align the pointer to the (next) page boundary */

#define PAGE_ALIGN(addr)  (((addr)+PAGE_SIZE-1)&PAGE_MASK)

#define PAGE_OFFSET     0xf0000000

#define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)

#define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))

#define virt_to_page(kaddr)     (mem_map + (__pa(kaddr) >> PAGE_SHIFT))

#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)

#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* __KERNEL__ */

#endif /* _SPARC_PAGE_H */