include/asm-nios2nommu/page.h

   1 /*
   2  * Copyright (C) 2004, Microtronix Datacom Ltd.
   3  *
   4  * All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  14  * NON INFRINGEMENT.  See the GNU General Public License for more
  15  * details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #ifndef _NIOS2_PAGE_H
  24 #define _NIOS2_PAGE_H
  25
  26 /* copied from m68knommu arch */
  27
  28 /* PAGE_SHIFT determines the page size */
  29
  30 #define PAGE_SHIFT      (12)
  31 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  32 #define PAGE_MASK       (~(PAGE_SIZE-1))
  33
  34 #ifdef __KERNEL__
  35
  36 #include <asm/setup.h>
  37
  38 #if PAGE_SHIFT < 13
  39 #define THREAD_SIZE (8192)
  40 #else
  41 #define THREAD_SIZE PAGE_SIZE
  42 #endif
  43
  44 #ifndef __ASSEMBLY__
  45
  46 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  47 #define free_user_page(page, addr)      free_page(addr)
  48
  49 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  50 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  51
  52 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  53 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  54
  55 /*
  56  * These are used to make use of C type-checking..
  57  */
  58 typedef struct { unsigned long pte; } pte_t;
  59 typedef struct { unsigned long pmd[16]; } pmd_t;
  60 typedef struct { unsigned long pgd; } pgd_t;
  61 typedef struct { unsigned long pgprot; } pgprot_t;
  62
  63 #define pte_val(x)      ((x).pte)
  64 #define pmd_val(x)      ((&x)->pmd[0])
  65 #define pgd_val(x)      ((x).pgd)
  66 #define pgprot_val(x)   ((x).pgprot)
  67
  68 #define __pte(x)        ((pte_t) { (x) } )
  69 #define __pmd(x)        ((pmd_t) { (x) } )
  70 #define __pgd(x)        ((pgd_t) { (x) } )
  71 #define __pgprot(x)     ((pgprot_t) { (x) } )
  72
  73 /* to align the pointer to the (next) page boundary */
  74 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  75
  76 extern unsigned long memory_start;
  77 extern unsigned long memory_end;
  78
  79 #endif /* !__ASSEMBLY__ */
  80 #include <asm/nios.h>
  81 #define PAGE_OFFSET             ((int)(nasys_program_mem))
  82
  83 #ifndef __ASSEMBLY__
  84
  85 #define __pa(vaddr)             virt_to_phys((void *)(vaddr))
  86 #define __va(paddr)             phys_to_virt((unsigned long)(paddr))
  87
  88 #define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
  89
  90 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  91 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  92
  93 #define virt_to_page(addr)      (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  94 #define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  95 #define VALID_PAGE(page)        (((page) - mem_map) < max_mapnr)
  96
  97 #define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
  98 #define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
  99 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 100
 101 #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
 102                                 ((void *)(kaddr) < (void *)memory_end))
 103
 104 #ifdef CONFIG_NO_KERNEL_MSG
 105 #define BUG_PRINT()
 106 #else
 107 #define BUG_PRINT() printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__)
 108 #endif
 109
 110 #ifdef na_cpu_oci_core
 111 #define BUG_PANIC()     asm volatile ("break") /* drop to debugger */
 112 #else
 113 // #define BUG_PANIC()  while(1)
 114 #define BUG_PANIC()     panic("BUG!")
 115 #endif
 116
 117 #endif /* __ASSEMBLY__ */
 118
 119 #include <asm-generic/page.h>
 120
 121 #endif /* __KERNEL__ */
 122
 123 #endif /* _NIOS2_PAGE_H */