arch/powerpc/include/asm/abs_addr.h

   1 #ifndef _ASM_POWERPC_ABS_ADDR_H
   2 #define _ASM_POWERPC_ABS_ADDR_H
   3 #ifdef __KERNEL__
   4
   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 <linux/lmb.h>
  16
  17 #include <asm/types.h>
  18 #include <asm/page.h>
  19 #include <asm/prom.h>
  20 #include <asm/firmware.h>
  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         /* This is a no-op on non-iSeries */
  52         if (!firmware_has_feature(FW_FEATURE_ISERIES))
  53                 return pa;
  54
  55         chunk = addr_to_chunk(pa);
  56
  57         if (chunk < mschunks_map.num_chunks)
  58                 chunk = mschunks_map.mapping[chunk];
  59
  60         return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
  61 }
  62
  63 /* Convenience macros */
  64 #define virt_to_abs(va) phys_to_abs(__pa(va))
  65 #define abs_to_virt(aa) __va(aa)
  66
  67 /*
  68  * Converts Virtual Address to Real Address for
  69  * Legacy iSeries Hypervisor calls
  70  */
  71 #define iseries_hv_addr(virtaddr)       \
  72         (0x8000000000000000 | virt_to_abs(virtaddr))
  73
  74 #endif /* __KERNEL__ */
  75 #endif /* _ASM_POWERPC_ABS_ADDR_H */