4 #include <linux/config.h>
7 * c 2001 PPC 64 Team, IBM Corp
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.
15 #include <asm/types.h>
20 #ifdef CONFIG_MSCHUNKS
23 unsigned long num_chunks;
24 unsigned long chunk_size;
25 unsigned long chunk_shift;
26 unsigned long chunk_mask;
30 extern struct mschunks_map mschunks_map;
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)
37 static inline unsigned long chunk_to_addr(unsigned long chunk)
39 return chunk << MSCHUNKS_CHUNK_SHIFT;
42 static inline unsigned long addr_to_chunk(unsigned long addr)
44 return addr >> MSCHUNKS_CHUNK_SHIFT;
47 static inline unsigned long phys_to_abs(unsigned long pa)
51 chunk = addr_to_chunk(pa);
53 if (chunk < mschunks_map.num_chunks)
54 chunk = mschunks_map.mapping[chunk];
56 return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
59 static inline unsigned long
60 physRpn_to_absRpn(unsigned long rpn)
62 unsigned long pa = rpn << PAGE_SHIFT;
63 unsigned long aa = phys_to_abs(pa);
64 return (aa >> PAGE_SHIFT);
67 /* A macro so it can take pointers or unsigned long. */
68 #define abs_to_phys(aa) lmb_abs_to_phys((unsigned long)(aa))
70 #else /* !CONFIG_MSCHUNKS */
72 #define chunk_to_addr(chunk) ((unsigned long)(chunk))
73 #define addr_to_chunk(addr) (addr)
74 #define chunk_offset(addr) (0)
75 #define abs_chunk(pchunk) (pchunk)
77 #define phys_to_abs(pa) (pa)
78 #define physRpn_to_absRpn(rpn) (rpn)
79 #define abs_to_phys(aa) (aa)
81 #endif /* !CONFIG_MSCHUNKS */
83 /* Convenience macros */
84 #define virt_to_abs(va) phys_to_abs(__pa(va))
85 #define abs_to_virt(aa) __va(abs_to_phys(aa))
87 #endif /* _ABS_ADDR_H */