arch/score/include/asm/fixmap.h

   1 #ifndef _ASM_SCORE_FIXMAP_H
   2 #define _ASM_SCORE_FIXMAP_H
   3
   4 #include <asm/page.h>
   5
   6 #define PHY_RAM_BASE            0x00000000
   7 #define PHY_IO_BASE             0x10000000
   8
   9 #define VIRTUAL_RAM_BASE        0xa0000000
  10 #define VIRTUAL_IO_BASE         0xb0000000
  11
  12 #define RAM_SPACE_SIZE          0x10000000
  13 #define IO_SPACE_SIZE           0x10000000
  14
  15 /* Kernel unmapped, cached 512MB */
  16 #define KSEG1                   0xa0000000
  17
  18 /*
  19  * Here we define all the compile-time 'special' virtual
  20  * addresses. The point is to have a constant address at
  21  * compile time, but to set the physical address only
  22  * in the boot process. We allocate these special addresses
  23  * from the end of virtual memory (0xfffff000) backwards.
  24  * Also this lets us do fail-safe vmalloc(), we
  25  * can guarantee that these special addresses and
  26  * vmalloc()-ed addresses never overlap.
  27  *
  28  * these 'compile-time allocated' memory buffers are
  29  * fixed-size 4k pages. (or larger if used with an increment
  30  * highger than 1) use fixmap_set(idx,phys) to associate
  31  * physical memory with fixmap indices.
  32  *
  33  * TLB entries of such buffers will not be flushed across
  34  * task switches.
  35  */
  36
  37 /*
  38  * on UP currently we will have no trace of the fixmap mechanizm,
  39  * no page table allocations, etc. This might change in the
  40  * future, say framebuffers for the console driver(s) could be
  41  * fix-mapped?
  42  */
  43 enum fixed_addresses {
  44 #define FIX_N_COLOURS 8
  45         FIX_CMAP_BEGIN,
  46         FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS,
  47         __end_of_fixed_addresses
  48 };
  49
  50 /*
  51  * used by vmalloc.c.
  52  *
  53  * Leave one empty page between vmalloc'ed areas and
  54  * the start of the fixmap, and leave one page empty
  55  * at the top of mem..
  56  */
  57 #define FIXADDR_TOP     ((unsigned long)(long)(int)0xfefe0000)
  58 #define FIXADDR_SIZE    (__end_of_fixed_addresses << PAGE_SHIFT)
  59 #define FIXADDR_START   (FIXADDR_TOP - FIXADDR_SIZE)
  60
  61 #define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
  62 #define __virt_to_fix(x)        \
  63         ((FIXADDR_TOP - ((x) & PAGE_MASK)) >> PAGE_SHIFT)
  64
  65 extern void __this_fixmap_does_not_exist(void);
  66
  67 /*
  68  * 'index to address' translation. If anyone tries to use the idx
  69  * directly without tranlation, we catch the bug with a NULL-deference
  70  * kernel oops. Illegal ranges of incoming indices are caught too.
  71  */
  72 static inline unsigned long fix_to_virt(const unsigned int idx)
  73 {
  74         return __fix_to_virt(idx);
  75 }
  76
  77 static inline unsigned long virt_to_fix(const unsigned long vaddr)
  78 {
  79         return __virt_to_fix(vaddr);
  80 }
  81
  82 #endif /* _ASM_SCORE_FIXMAP_H */