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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 1994 - 1999, 2000 by Ralf Baechle

 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.

 */

#ifndef _ASM_PAGE_H

#define _ASM_PAGE_H

#include <linux/config.h>

#include <asm/break.h>

#ifdef __KERNEL__

/*

 * PAGE_SHIFT determines the page size

 */

#ifdef CONFIG_PAGE_SIZE_4KB

#define PAGE_SHIFT      12

#endif

#ifdef CONFIG_PAGE_SIZE_16KB

#define PAGE_SHIFT      14

#endif

#ifdef CONFIG_PAGE_SIZE_64KB

#define PAGE_SHIFT      16

#endif

#define PAGE_SIZE       (1UL << PAGE_SHIFT)

#define PAGE_MASK       (~(PAGE_SIZE-1))

#ifndef __ASSEMBLY__

#include <asm/cacheflush.h>

#define BUG()                                                           \

do {                                                                    \

        __asm__ __volatile__("break %0" : : "i" (BRK_BUG));             \

} while (0)

#define PAGE_BUG(page) do {  BUG(); } while (0)

extern void clear_page(void * page);

extern void copy_page(void * to, void * from);

extern unsigned long shm_align_mask;

static inline unsigned long pages_do_alias(unsigned long addr1,

        unsigned long addr2)

{

        return (addr1 ^ addr2) & shm_align_mask;

}

static inline void clear_user_page(void *page, unsigned long vaddr)

{

        unsigned long kaddr = (unsigned long) page;

        clear_page(page);

        if (pages_do_alias(kaddr, vaddr))

                flush_data_cache_page(kaddr);

}

static inline void copy_user_page(void * to, void * from, unsigned long vaddr)

{

        unsigned long kto = (unsigned long) to;

        copy_page(to, from);

        if (pages_do_alias(kto, vaddr))

                flush_data_cache_page(kto);

}

/*

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

 */

typedef struct { unsigned long pte; } pte_t;

typedef struct { unsigned long pmd; } pmd_t;

typedef struct { unsigned long pgd; } pgd_t;

typedef struct { unsigned long pgprot; } pgprot_t;

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

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

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

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

#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))

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

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

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

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

/* Pure 2^n version of get_order */

static __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;

}

#endif /* !__ASSEMBLY__ */

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

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

/*

 * This handles the memory map.

 * We handle pages at KSEG0 for kernels with upto 512mb of memory,

 * at XKPHYS with a suitable caching mode for kernels with more than that.

 */

#if defined(CONFIG_SGI_IP22) || defined(CONFIG_MIPS_ATLAS) || \

    defined(CONFIG_MIPS_MALTA) || defined(CONFIG_MIPS_SEAD) || \

    defined(CONFIG_DECSTATION) || defined(CONFIG_MIPS_COBALT)

#define PAGE_OFFSET     0xffffffff80000000UL

#define UNCAC_BASE      0xffffffffa0000000UL

#endif

#if defined(CONFIG_SGI_IP27)

#define PAGE_OFFSET     0xa800000000000000UL

#define UNCAC_BASE      0x9600000000000000UL

#endif

#if defined(CONFIG_SIBYTE_SB1xxx_SOC)

#define PAGE_OFFSET     0xa800000000000000UL

#endif

#if defined(CONFIG_MOMENCO_OCELOT_C)

#define PAGE_OFFSET     0x9800000000000000UL

#define UNCAC_BASE      0x9000000000000000UL

#endif

#if defined(CONFIG_MOMENCO_JAGUAR_ATX)

#define PAGE_OFFSET     0xa800000000000000UL    /* cached, coherent writeback */

#define UNCAC_BASE      0x9000000000000000UL    /* uncac, blocking */

#endif

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

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

#ifndef CONFIG_DISCONTIGMEM

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

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

#endif

#define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + UNCAC_BASE)

#define CAC_ADDR(addr)          ((addr) - UNCAC_BASE + PAGE_OFFSET)

#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* defined (__KERNEL__) */

#endif /* _ASM_PAGE_H */