Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/include/asm/abs_addr.h
15117 views
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/memblock.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
	(0x8000000000000000UL | virt_to_abs(virtaddr))

73


74
#endif /* __KERNEL__ */

75
#endif /* _ASM_POWERPC_ABS_ADDR_H */

76


77