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/* $Id: page.h,v 1.1.1.1 2001-09-10 07:44:43 simons 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 <asm/head.h>       /* for KERNBASE */

#define PAGE_SHIFT   12

#define PAGE_OFFSET  KERNBASE

#define PAGE_SIZE    (1 << PAGE_SHIFT)

#define PAGE_MASK    (~(PAGE_SIZE-1))

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

/* 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

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

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

/* We now put the free page pool mapped contiguously in high memory above

 * the kernel.

 */

#define MAP_NR(addr) ((((unsigned long) (addr)) - PAGE_OFFSET) >> PAGE_SHIFT)

#endif /* !(__ASSEMBLY__) */

#endif /* __KERNEL__ */

#endif /* _SPARC_PAGE_H */