include/asm-ppc64/abs_addr.h

   1 #ifndef _ABS_ADDR_H
   2 #define _ABS_ADDR_H
   3
   4 #include <linux/config.h>
   5
   6 /*
   7  * c 2001 PPC 64 Team, IBM Corp
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <asm/types.h>
  16 #include <asm/page.h>
  17 #include <asm/prom.h>
  18 #include <asm/lmb.h>
  19
  20 #ifdef CONFIG_MSCHUNKS
  21
  22 struct mschunks_map {
  23         unsigned long num_chunks;
  24         unsigned long chunk_size;
  25         unsigned long chunk_shift;
  26         unsigned long chunk_mask;
  27         u32 *mapping;
  28 };
  29
  30 extern struct mschunks_map mschunks_map;
  31
  32 /* Chunks are 256 KB */
  33 #define MSCHUNKS_CHUNK_SHIFT    (18)
  34 #define MSCHUNKS_CHUNK_SIZE     (1UL << MSCHUNKS_CHUNK_SHIFT)
  35 #define MSCHUNKS_OFFSET_MASK    (MSCHUNKS_CHUNK_SIZE - 1)
  36
  37 static inline unsigned long chunk_to_addr(unsigned long chunk)
  38 {
  39         return chunk << MSCHUNKS_CHUNK_SHIFT;
  40 }
  41
  42 static inline unsigned long addr_to_chunk(unsigned long addr)
  43 {
  44         return addr >> MSCHUNKS_CHUNK_SHIFT;
  45 }
  46
  47 static inline unsigned long phys_to_abs(unsigned long pa)
  48 {
  49         unsigned long chunk;
  50
  51         chunk = addr_to_chunk(pa);
  52
  53         if (chunk < mschunks_map.num_chunks)
  54                 chunk = mschunks_map.mapping[chunk];
  55
  56         return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
  57 }
  58
  59 #else  /* !CONFIG_MSCHUNKS */
  60
  61 #define chunk_to_addr(chunk) ((unsigned long)(chunk))
  62 #define addr_to_chunk(addr) (addr)
  63 #define chunk_offset(addr) (0)
  64 #define abs_chunk(pchunk) (pchunk)
  65
  66 #define phys_to_abs(pa) (pa)
  67 #define physRpn_to_absRpn(rpn) (rpn)
  68
  69 #endif /* !CONFIG_MSCHUNKS */
  70
  71 /* Convenience macros */
  72 #define virt_to_abs(va) phys_to_abs(__pa(va))
  73 #define abs_to_virt(aa) __va(aa)
  74
  75 #endif /* _ABS_ADDR_H */