kernel/arch/ppc32/include/mm/page.h

   1 /*
   2  * Copyright (C) 2005 Martin Decky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup ppc32mm
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #ifndef __ppc32_PAGE_H__
  36 #define __ppc32_PAGE_H__
  37
  38 #include <arch/mm/frame.h>
  39
  40 #define PAGE_WIDTH      FRAME_WIDTH
  41 #define PAGE_SIZE       FRAME_SIZE
  42
  43 #define PAGE_COLOR_BITS 0                       /* dummy */
  44
  45 #ifdef KERNEL
  46
  47 #ifndef __ASM__
  48 #       define KA2PA(x) (((uintptr_t) (x)) - 0x80000000)
  49 #       define PA2KA(x) (((uintptr_t) (x)) + 0x80000000)
  50 #else
  51 #       define KA2PA(x) ((x) - 0x80000000)
  52 #       define PA2KA(x) ((x) + 0x80000000)
  53 #endif
  54
  55 /*
  56  * Implementation of generic 4-level page table interface,
  57  * the hardware Page Hash Table is used as cache.
  58  *
  59  * Page table layout:
  60  * - 32-bit virtual addressess
  61  * - Offset is 12 bits => pages are 4K long
  62  * - PTL0 has 1024 entries (10 bits)
  63  * - PTL1 is not used
  64  * - PTL2 is not used
  65  * - PLT3 has 1024 entries (10 bits)
  66  */
  67
  68 #define PTL0_ENTRIES_ARCH       1024
  69 #define PTL1_ENTRIES_ARCH       0
  70 #define PTL2_ENTRIES_ARCH       0
  71 #define PTL3_ENTRIES_ARCH       1024
  72
  73 #define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)
  74 #define PTL1_INDEX_ARCH(vaddr)  0
  75 #define PTL2_INDEX_ARCH(vaddr)  0
  76 #define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)
  77
  78 #define GET_PTL1_ADDRESS_ARCH(ptl0, i)          (((pte_t *) (ptl0))[(i)].pfn << 12)
  79 #define GET_PTL2_ADDRESS_ARCH(ptl1, i)          (ptl1)
  80 #define GET_PTL3_ADDRESS_ARCH(ptl2, i)          (ptl2)
  81 #define GET_FRAME_ADDRESS_ARCH(ptl3, i)         (((pte_t *) (ptl3))[(i)].pfn << 12)
  82
  83 #define SET_PTL0_ADDRESS_ARCH(ptl0)
  84 #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)       (((pte_t *) (ptl0))[(i)].pfn = (a) >> 12)
  85 #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  86 #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  87 #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)      (((pte_t *) (ptl3))[(i)].pfn = (a) >> 12)
  88
  89 #define GET_PTL1_FLAGS_ARCH(ptl0, i)            get_pt_flags((pte_t *) (ptl0), (index_t) (i))
  90 #define GET_PTL2_FLAGS_ARCH(ptl1, i)            PAGE_PRESENT
  91 #define GET_PTL3_FLAGS_ARCH(ptl2, i)            PAGE_PRESENT
  92 #define GET_FRAME_FLAGS_ARCH(ptl3, i)           get_pt_flags((pte_t *) (ptl3), (index_t) (i))
  93
  94 #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)         set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))
  95 #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  96 #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  97 #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)        set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))
  98
  99 #define PTE_VALID_ARCH(pte)                     (*((uint32_t *) (pte)) != 0)
 100 #define PTE_PRESENT_ARCH(pte)                   ((pte)->p != 0)
 101 #define PTE_GET_FRAME_ARCH(pte)                 ((pte)->pfn << 12)
 102 #define PTE_WRITABLE_ARCH(pte)                  1
 103 #define PTE_EXECUTABLE_ARCH(pte)                1
 104
 105 #ifndef __ASM__
 106
 107 #include <mm/page.h>
 108 #include <arch/mm/frame.h>
 109 #include <arch/types.h>
 110
 111 static inline int get_pt_flags(pte_t *pt, index_t i)
 112 {
 113         pte_t *p = &pt[i];
 114
 115         return (
 116                 (1 << PAGE_CACHEABLE_SHIFT) |
 117                 ((!p->p) << PAGE_PRESENT_SHIFT) |
 118                 (1 << PAGE_USER_SHIFT) |
 119                 (1 << PAGE_READ_SHIFT) |
 120                 (1 << PAGE_WRITE_SHIFT) |
 121                 (1 << PAGE_EXEC_SHIFT) |
 122                 (p->g << PAGE_GLOBAL_SHIFT)
 123         );
 124 }
 125
 126 static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
 127 {
 128         pte_t *p = &pt[i];
 129
 130         p->p = !(flags & PAGE_NOT_PRESENT);
 131         p->g = (flags & PAGE_GLOBAL) != 0;
 132         p->valid = 1;
 133 }
 134
 135 extern void page_arch_init(void);
 136
 137 #endif /* __ASM__ */
 138
 139 #endif /* KERNEL */
 140
 141 #endif
 142
 143 /** @}
 144  */