LXR linux/arch/s390/include/asm/page.h

   1/*
   2 *  S390 version
   3 *    Copyright IBM Corp. 1999, 2000
   4 *    Author(s): Hartmut Penner (hp@de.ibm.com)
   5 */
   6
   7#ifndef _S390_PAGE_H
   8#define _S390_PAGE_H
   9
  10#include <linux/const.h>
  11#include <asm/types.h>
  12
  13/* PAGE_SHIFT determines the page size */
  14#define PAGE_SHIFT      12
  15#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  16#define PAGE_MASK       (~(PAGE_SIZE-1))
  17#define PAGE_DEFAULT_ACC        0
  18#define PAGE_DEFAULT_KEY        (PAGE_DEFAULT_ACC << 4)
  19
  20#define HPAGE_SHIFT     20
  21#define HPAGE_SIZE      (1UL << HPAGE_SHIFT)
  22#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  23#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  24
  25#define ARCH_HAS_SETCLEAR_HUGE_PTE
  26#define ARCH_HAS_HUGE_PTE_TYPE
  27#define ARCH_HAS_PREPARE_HUGEPAGE
  28#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
  29
  30#include <asm/setup.h>
  31#ifndef __ASSEMBLY__
  32
  33static inline void storage_key_init_range(unsigned long start, unsigned long end)
  34{
  35#if PAGE_DEFAULT_KEY
  36        __storage_key_init_range(start, end);
  37#endif
  38}
  39
  40static inline void clear_page(void *page)
  41{
  42        register unsigned long reg1 asm ("1") = 0;
  43        register void *reg2 asm ("2") = page;
  44        register unsigned long reg3 asm ("3") = 4096;
  45        asm volatile(
  46                "       mvcl    2,0"
  47                : "+d" (reg2), "+d" (reg3) : "d" (reg1)
  48                : "memory", "cc");
  49}
  50
  51/*
  52 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
  53 * bypass caches when copying a page. Especially when copying huge pages
  54 * this keeps L1 and L2 data caches alive.
  55 */
  56static inline void copy_page(void *to, void *from)
  57{
  58        register void *reg2 asm ("2") = to;
  59        register unsigned long reg3 asm ("3") = 0x1000;
  60        register void *reg4 asm ("4") = from;
  61        register unsigned long reg5 asm ("5") = 0xb0001000;
  62        asm volatile(
  63                "       mvcl    2,4"
  64                : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
  65                : : "memory", "cc");
  66}
  67
  68#define clear_user_page(page, vaddr, pg)        clear_page(page)
  69#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  70
  71#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  72        alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  73#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  74
  75/*
  76 * These are used to make use of C type-checking..
  77 */
  78
  79typedef struct { unsigned long pgprot; } pgprot_t;
  80typedef struct { unsigned long pgste; } pgste_t;
  81typedef struct { unsigned long pte; } pte_t;
  82typedef struct { unsigned long pmd; } pmd_t;
  83typedef struct { unsigned long pud; } pud_t;
  84typedef struct { unsigned long pgd; } pgd_t;
  85typedef pte_t *pgtable_t;
  86
  87#define pgprot_val(x)   ((x).pgprot)
  88#define pgste_val(x)    ((x).pgste)
  89#define pte_val(x)      ((x).pte)
  90#define pmd_val(x)      ((x).pmd)
  91#define pud_val(x)      ((x).pud)
  92#define pgd_val(x)      ((x).pgd)
  93
  94#define __pgste(x)      ((pgste_t) { (x) } )
  95#define __pte(x)        ((pte_t) { (x) } )
  96#define __pmd(x)        ((pmd_t) { (x) } )
  97#define __pud(x)        ((pud_t) { (x) } )
  98#define __pgd(x)        ((pgd_t) { (x) } )
  99#define __pgprot(x)     ((pgprot_t) { (x) } )
 100
 101static inline void page_set_storage_key(unsigned long addr,
 102                                        unsigned char skey, int mapped)
 103{
 104        if (!mapped)
 105                asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 106                             : : "d" (skey), "a" (addr));
 107        else
 108                asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 109}
 110
 111static inline unsigned char page_get_storage_key(unsigned long addr)
 112{
 113        unsigned char skey;
 114
 115        asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 116        return skey;
 117}
 118
 119static inline int page_reset_referenced(unsigned long addr)
 120{
 121        unsigned int ipm;
 122
 123        asm volatile(
 124                "       rrbe    0,%1\n"
 125                "       ipm     %0\n"
 126                : "=d" (ipm) : "a" (addr) : "cc");
 127        return !!(ipm & 0x20000000);
 128}
 129
 130/* Bits int the storage key */
 131#define _PAGE_CHANGED           0x02    /* HW changed bit               */
 132#define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 133#define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 134#define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 135
 136struct page;
 137void arch_free_page(struct page *page, int order);
 138void arch_alloc_page(struct page *page, int order);
 139void arch_set_page_states(int make_stable);
 140
 141static inline int devmem_is_allowed(unsigned long pfn)
 142{
 143        return 0;
 144}
 145
 146#define HAVE_ARCH_FREE_PAGE
 147#define HAVE_ARCH_ALLOC_PAGE
 148
 149#endif /* !__ASSEMBLY__ */
 150
 151#define __PAGE_OFFSET           0x0UL
 152#define PAGE_OFFSET             0x0UL
 153#define __pa(x)                 (unsigned long)(x)
 154#define __va(x)                 (void *)(unsigned long)(x)
 155#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 156#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 157#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 158
 159#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 160                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 161
 162#include <asm-generic/memory_model.h>
 163#include <asm-generic/getorder.h>
 164
 165#endif /* _S390_PAGE_H */
 166