LXR linux-old/include/asm-s390x/page.h

   1/*
   2 *  include/asm-s390/page.h
   3 *
   4 *  S390 version
   5 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6 *    Author(s): Hartmut Penner (hpenner@de.ibm.com)
   7 */
   8
   9#ifndef _S390_PAGE_H
  10#define _S390_PAGE_H
  11
  12#include <asm/setup.h>
  13
  14/* PAGE_SHIFT determines the page size */
  15#define PAGE_SHIFT      12
  16#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  17#define PAGE_MASK       (~(PAGE_SIZE-1))
  18
  19#ifdef __KERNEL__
  20#ifndef __ASSEMBLY__
  21
  22static inline void clear_page(void *page)
  23{
  24        asm volatile ("   lgr  2,%0\n"
  25                      "   lghi 3,4096\n"
  26                      "   slgr 1,1\n"
  27                      "   mvcl 2,0"
  28                      : : "a" ((void *) (page))
  29                      : "memory", "cc", "1", "2", "3" );
  30}
  31
  32static inline void copy_page(void *to, void *from)
  33{
  34        if (MACHINE_HAS_MVPG)
  35                asm volatile ("   sgr  0,0\n"
  36                              "   mvpg %0,%1"
  37                              : : "a" ((void *)(to)), "a" ((void *)(from))
  38                              : "memory", "cc", "0" );
  39        else
  40                asm volatile ("   mvc  0(256,%0),0(%1)\n"
  41                              "   mvc  256(256,%0),256(%1)\n"
  42                              "   mvc  512(256,%0),512(%1)\n"
  43                              "   mvc  768(256,%0),768(%1)\n"
  44                              "   mvc  1024(256,%0),1024(%1)\n"
  45                              "   mvc  1280(256,%0),1280(%1)\n"
  46                              "   mvc  1536(256,%0),1536(%1)\n"
  47                              "   mvc  1792(256,%0),1792(%1)\n"
  48                              "   mvc  2048(256,%0),2048(%1)\n"
  49                              "   mvc  2304(256,%0),2304(%1)\n"
  50                              "   mvc  2560(256,%0),2560(%1)\n"
  51                              "   mvc  2816(256,%0),2816(%1)\n"
  52                              "   mvc  3072(256,%0),3072(%1)\n"
  53                              "   mvc  3328(256,%0),3328(%1)\n"
  54                              "   mvc  3584(256,%0),3584(%1)\n"
  55                              "   mvc  3840(256,%0),3840(%1)\n"
  56                              : : "a"((void *)(to)),"a"((void *)(from)) 
  57                              : "memory" );
  58}
  59
  60#define clear_user_page(page, vaddr)    clear_page(page)
  61#define copy_user_page(to, from, vaddr) copy_page(to, from)
  62
  63#define BUG() do { \
  64        printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  65        __asm__ __volatile__(".long 0"); \
  66} while (0)                                       
  67
  68#define PAGE_BUG(page) do { \
  69        BUG(); \
  70} while (0)                      
  71
  72/* Pure 2^n version of get_order */
  73extern __inline__ int get_order(unsigned long size)
  74{
  75        int order;
  76
  77        size = (size-1) >> (PAGE_SHIFT-1);
  78        order = -1;
  79        do {
  80                size >>= 1;
  81                order++;
  82        } while (size);
  83        return order;
  84}
  85
  86/*
  87 * These are used to make use of C type-checking..
  88 */
  89typedef struct { unsigned long pte; } pte_t;
  90typedef struct { 
  91        unsigned long pmd0;
  92        unsigned long pmd1; 
  93        } pmd_t;
  94typedef unsigned int pgd_t;
  95typedef struct { unsigned long pgprot; } pgprot_t;
  96
  97#define pte_val(x)      ((x).pte)
  98#define pmd_val(x)      ((x).pmd0)
  99#define pmd_val1(x)     ((x).pmd1)
 100
 101static inline unsigned long __pgd_val(pgd_t *pgdp)
 102{
 103        unsigned long addr = (unsigned long) pgdp;
 104        unsigned long *pgd_slot = (unsigned long *) (addr & -8);
 105
 106        return *pgd_slot + ((addr & 4) << 11);
 107}
 108#define pgd_val(pgd) __pgd_val(&(pgd))
 109
 110#define pgprot_val(x)   ((x).pgprot)
 111
 112#define __pte(x)        ((pte_t) { (x) } )
 113#define __pmd(x)        ((pmd_t) { (x) } )
 114#define __pgd(x)        ((pgd_t) { (x) } )
 115#define __pgprot(x)     ((pgprot_t) { (x) } )
 116
 117#endif                                 /* !__ASSEMBLY__                    */
 118
 119/* to align the pointer to the (next) page boundary */
 120#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 121
 122#define __PAGE_OFFSET           0x0UL
 123#define PAGE_OFFSET             0x0UL
 124#define __pa(x)                 (unsigned long)(x)
 125#define __va(x)                 (void *)(x)
 126#define virt_to_page(kaddr)     (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
 127#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
 128
 129#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 130                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 131
 132#define get_storage_key() 0
 133#define pfix_get_page_addr(addr) (unsigned long)addr
 134#define pfix_get_addr(addr) (unsigned long)addr
 135
 136#endif                                 /* __KERNEL__                       */
 137
 138#endif                                 /* _S390_PAGE_H                     */
 139