page.h

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/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2000
 *    Author(s): Hartmut Penner ([email protected])
 */

#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 unsigned long pfmf(unsigned long function, unsigned long address)
{
    asm volatile(
        "   .insn   rre,0xb9af0000,%[function],%[address]"
        : [address] "+a" (address)
        : [function] "d" (function)
        : "memory");
    return address;
}

static inline void clear_page(void *page)
{
    if (MACHINE_HAS_PFMF) {
        pfmf(0x10000, (unsigned long)page);
    } 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 pgste; } pgste_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 pgste_val(x)    ((x).pgste)
#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 __pgste(x)  ((pgste_t) { (x) } )
#define __pte(x)        ((pte_t) { (x) } )
#define __pmd(x)        ((pmd_t) { (x) } )
#define __pud(x)    ((pud_t) { (x) } )
#define __pgd(x)        ((pgd_t) { (x) } )
#define __pgprot(x)     ((pgprot_t) { (x) } )

static inline void page_set_storage_key(unsigned long addr,
                    unsigned char skey, int mapped)
{
    if (!mapped)
        asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
                 : : "d" (skey), "a" (addr));
    else
        asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
}

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

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

static inline int page_reset_referenced(unsigned long addr)
{
    unsigned int ipm;

    asm volatile(
        "   rrbe    0,%1\n"
        "   ipm %0\n"
        : "=d" (ipm) : "a" (addr) : "cc");
    return !!(ipm & 0x20000000);
}

/* Bits int the storage key */
#define _PAGE_CHANGED       0x02    /* HW changed bit       */
#define _PAGE_REFERENCED    0x04    /* HW referenced bit        */
#define _PAGE_FP_BIT        0x08    /* HW fetch protection bit  */
#define _PAGE_ACC_BITS      0xf0    /* HW access control bits   */

/*
 * Test and clear dirty bit in storage key.
 * We can't clear the changed bit atomically. This is a potential
 * race against modification of the referenced bit. This function
 * should therefore only be called if it is not mapped in any
 * address space.
 */
#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped)
{
    unsigned char skey;

    skey = page_get_storage_key(pfn << PAGE_SHIFT);
    if (!(skey & _PAGE_CHANGED))
        return 0;
    page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped);
    return 1;
}

/*
 * Test and clear referenced bit in storage key.
 */
#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
static inline int page_test_and_clear_young(unsigned long pfn)
{
    return page_reset_referenced(pfn << PAGE_SHIFT);
}

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

static inline int devmem_is_allowed(unsigned long pfn)
{
    return 0;
}

#define HAVE_ARCH_FREE_PAGE
#define HAVE_ARCH_ALLOC_PAGE

#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/getorder.h>

#define __HAVE_ARCH_GATE_AREA 1

#endif /* _S390_PAGE_H */