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 <asm/types.h>
16#include <asm/page.h>
17#include <asm/prom.h>
18#include <asm/lmb.h>
19#include <asm/firmware.h>
20
21struct mschunks_map {
22        unsigned long num_chunks;
23        unsigned long chunk_size;
24        unsigned long chunk_shift;
25        unsigned long chunk_mask;
26        u32 *mapping;
27};
28
29extern struct mschunks_map mschunks_map;
30
31/* Chunks are 256 KB */
32#define MSCHUNKS_CHUNK_SHIFT	(18)
33#define MSCHUNKS_CHUNK_SIZE	(1UL << MSCHUNKS_CHUNK_SHIFT)
34#define MSCHUNKS_OFFSET_MASK	(MSCHUNKS_CHUNK_SIZE - 1)
35
36static inline unsigned long chunk_to_addr(unsigned long chunk)
37{
38	return chunk << MSCHUNKS_CHUNK_SHIFT;
39}
40
41static inline unsigned long addr_to_chunk(unsigned long addr)
42{
43	return addr >> MSCHUNKS_CHUNK_SHIFT;
44}
45
46static inline unsigned long phys_to_abs(unsigned long pa)
47{
48	unsigned long chunk;
49
50	/* This is a no-op on non-iSeries */
51	if (!firmware_has_feature(FW_FEATURE_ISERIES))
52		return pa;
53
54	chunk = addr_to_chunk(pa);
55
56	if (chunk < mschunks_map.num_chunks)
57		chunk = mschunks_map.mapping[chunk];
58
59	return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
60}
61
62/* Convenience macros */
63#define virt_to_abs(va) phys_to_abs(__pa(va))
64#define abs_to_virt(aa) __va(aa)
65
66/*
67 * Converts Virtual Address to Real Address for
68 * Legacy iSeries Hypervisor calls
69 */
70#define iseries_hv_addr(virtaddr)	\
71	(0x8000000000000000 | virt_to_abs(virtaddr))
72
73#endif /* __KERNEL__ */
74#endif /* _ASM_POWERPC_ABS_ADDR_H */
75