/*
* page.h: Various defines and such for MMU operations on the Sparc for
* the Linux kernel.
*
* Copyright (C) 1995 David S. Miller ([email protected])
*/

#ifndef _SPARC_PAGE_H
#define _SPARC_PAGE_H

#include <linux/const.h>

#define PAGE_SHIFT 12
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))

#ifndef __ASSEMBLY__

#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(addr, vaddr, page) \
do { clear_page(addr); \
sparc_flush_page_to_ram(page); \
} while (0)
#define copy_user_page(to, from, vaddr, page) \
do { copy_page(to, from); \
sparc_flush_page_to_ram(page); \
} while (0)

/* The following structure is used to hold the physical
* memory configuration of the machine. This is filled in
* prom_meminit() and is later used by mem_init() to set up
* mem_map[]. We statically allocate SPARC_PHYS_BANKS+1 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+1];

/* 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 pmdv[16]; } 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).pmdv[0])
#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) } ) */ /* XXX procedure with loop */
#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 struct { unsigned long pmdv[16]; } 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).pmdv[0])
#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) */ /* XXX later */
#define __pgd(x) (x)
#define __ctxd(x) (x)
#define __pgprot(x) (x)
#define __iopgprot(x) (x)

#endif

typedef struct page *pgtable_t;

#define TASK_UNMAPPED_BASE 0x50000000

#else /* !(__ASSEMBLY__) */

#define __pgprot(x) (x)

#endif /* !(__ASSEMBLY__) */

#define PAGE_OFFSET 0xf0000000
#ifndef __ASSEMBLY__
extern unsigned long phys_base;
extern unsigned long pfn_base;
#endif
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
#define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))

#define virt_to_phys __pa
#define phys_to_virt __va

#define ARCH_PFN_OFFSET (pfn_base)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define pfn_valid(pfn) (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
#define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)

#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _SPARC_PAGE_H */