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page.h

/*
 *  include/asm-s390/page.h
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 */

#ifndef _S390_PAGE_H
#define _S390_PAGE_H

#include <linux/const.h>
#include <asm/types.h>

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT      12
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK       (~(PAGE_SIZE-1))
#define PAGE_DEFAULT_ACC      0
#define PAGE_DEFAULT_KEY      (PAGE_DEFAULT_ACC << 4)

#define HPAGE_SHIFT     20
#define HPAGE_SIZE      (1UL << HPAGE_SHIFT)
#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER    (HPAGE_SHIFT - PAGE_SHIFT)

#define ARCH_HAS_SETCLEAR_HUGE_PTE
#define ARCH_HAS_HUGE_PTE_TYPE
#define ARCH_HAS_PREPARE_HUGEPAGE
#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH

#include <asm/setup.h>
#ifndef __ASSEMBLY__

static inline void clear_page(void *page)
{
      if (MACHINE_HAS_PFMF) {
            asm volatile(
                  "     .insn rre,0xb9af0000,%0,%1"
                  : : "d" (0x10000), "a" (page) : "memory", "cc");
      } else {
            register unsigned long reg1 asm ("1") = 0;
            register void *reg2 asm ("2") = page;
            register unsigned long reg3 asm ("3") = 4096;
            asm volatile(
                  "     mvcl  2,0"
                  : "+d" (reg2), "+d" (reg3) : "d" (reg1)
                  : "memory", "cc");
      }
}

static inline void copy_page(void *to, void *from)
{
      if (MACHINE_HAS_MVPG) {
            register unsigned long reg0 asm ("0") = 0;
            asm volatile(
                  "     mvpg  %0,%1"
                  : : "a" (to), "a" (from), "d" (reg0)
                  : "memory", "cc");
      } 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" (to), "a" (from) : "memory");
}

#define clear_user_page(page, vaddr, pg)  clear_page(page)
#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)

#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
      alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

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

typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pud; } pud_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef pte_t *pgtable_t;

#define pgprot_val(x)   ((x).pgprot)
#define pte_val(x)      ((x).pte)
#define pmd_val(x)      ((x).pmd)
#define pud_val(x)      ((x).pud)
#define pgd_val(x)      ((x).pgd)

#define __pte(x)        ((pte_t) { (x) } )
#define __pmd(x)        ((pmd_t) { (x) } )
#define __pgd(x)        ((pgd_t) { (x) } )
#define __pgprot(x)     ((pgprot_t) { (x) } )

/* default storage key used for all pages */
extern unsigned int default_storage_key;

static inline void
page_set_storage_key(unsigned long addr, unsigned int skey)
{
      asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
}

static inline unsigned int
page_get_storage_key(unsigned long addr)
{
      unsigned int skey;

      asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0));
      return skey;
}

#ifdef CONFIG_PAGE_STATES

struct page;
void arch_free_page(struct page *page, int order);
void arch_alloc_page(struct page *page, int order);

#define HAVE_ARCH_FREE_PAGE
#define HAVE_ARCH_ALLOC_PAGE

#endif

#endif /* !__ASSEMBLY__ */

#define __PAGE_OFFSET           0x0UL
#define PAGE_OFFSET             0x0UL
#define __pa(x)                 (unsigned long)(x)
#define __va(x)                 (void *)(unsigned long)(x)
#define virt_to_page(kaddr)   pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define page_to_phys(page)    (page_to_pfn(page) << PAGE_SHIFT)
#define virt_addr_valid(kaddr)      pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

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

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

#endif /* _S390_PAGE_H */

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