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/*

 *  include/asm-s390/page.h

 *

 *  S390 version

 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation

 *    Author(s): Hartmut Penner (hpenner@de.ibm.com)

 */

#ifndef _S390_PAGE_H

#define _S390_PAGE_H

#include <asm/setup.h>

/* PAGE_SHIFT determines the page size */

#define PAGE_SHIFT      12

#define PAGE_SIZE       (1UL << PAGE_SHIFT)

#define PAGE_MASK       (~(PAGE_SIZE-1))

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

static inline void clear_page(void *page)

{

        asm volatile ("   lgr  2,%0\n"

                      "   lghi 3,4096\n"

                      "   slgr 1,1\n"

                      "   mvcl 2,0"

                      : : "a" ((void *) (page))

                      : "memory", "cc", "1", "2", "3" );

}

static inline void copy_page(void *to, void *from)

{

        if (MACHINE_HAS_MVPG)

                asm volatile ("   sgr  0,0\n"

                              "   mvpg %0,%1"

                              : : "a" ((void *)(to)), "a" ((void *)(from))

                              : "memory", "cc", "0" );

        else

                asm volatile ("   mvc  0(256,%0),0(%1)\n"

                              "   mvc  256(256,%0),256(%1)\n"

                              "   mvc  512(256,%0),512(%1)\n"

                              "   mvc  768(256,%0),768(%1)\n"

                              "   mvc  1024(256,%0),1024(%1)\n"

                              "   mvc  1280(256,%0),1280(%1)\n"

                              "   mvc  1536(256,%0),1536(%1)\n"

                              "   mvc  1792(256,%0),1792(%1)\n"

                              "   mvc  2048(256,%0),2048(%1)\n"

                              "   mvc  2304(256,%0),2304(%1)\n"

                              "   mvc  2560(256,%0),2560(%1)\n"

                              "   mvc  2816(256,%0),2816(%1)\n"

                              "   mvc  3072(256,%0),3072(%1)\n"

                              "   mvc  3328(256,%0),3328(%1)\n"

                              "   mvc  3584(256,%0),3584(%1)\n"

                              "   mvc  3840(256,%0),3840(%1)\n"

                              : : "a"((void *)(to)),"a"((void *)(from))

                              : "memory" );

}

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

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

#define BUG() do { \

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

        __asm__ __volatile__(".long 0"); \

} while (0)

#define PAGE_BUG(page) do { \

        BUG(); \

} while (0)

/* 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;

}

/*

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

 */

typedef struct { unsigned long pte; } pte_t;

typedef struct {

        unsigned long pmd0;

        unsigned long pmd1;

        } pmd_t;

typedef unsigned int pgd_t;

typedef struct { unsigned long pgprot; } pgprot_t;

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

#define pmd_val(x)      ((x).pmd0)

#define pmd_val1(x)     ((x).pmd1)

static inline unsigned long __pgd_val(pgd_t *pgdp)

{

        unsigned long addr = (unsigned long) pgdp;

        unsigned long *pgd_slot = (unsigned long *) (addr & -8);

        return *pgd_slot + ((addr & 4) << 11);

}

#define pgd_val(pgd) __pgd_val(&(pgd))

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

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

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

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

#define __pgprot(x)     ((pgprot_t) { (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           0x0UL

#define PAGE_OFFSET             0x0UL

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

#define __va(x)                 (void *)(x)

#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)

#define get_storage_key() 0

#define pfix_get_page_addr(addr) (unsigned long)addr

#define pfix_get_addr(addr) (unsigned long)addr

#endif                                 /* __KERNEL__                       */

#endif                                 /* _S390_PAGE_H                     */