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/* $Id: page.h,v 1.1 2005-12-20 11:32:11 jcastillo 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 */