LXR linux/arch/powerpc/include/asm/abs

   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
  22struct 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
  30extern 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
  37static inline unsigned long chunk_to_addr(unsigned long chunk)
  38{
  39        return chunk << MSCHUNKS_CHUNK_SHIFT;
  40}
  41
  42static inline unsigned long addr_to_chunk(unsigned long addr)
  43{
  44        return addr >> MSCHUNKS_CHUNK_SHIFT;
  45}
  46
  47static 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 */
  76