1/*
2 * Meta page table definitions.
3 */
4
5#ifndef _METAG_PGTABLE_BITS_H
6#define _METAG_PGTABLE_BITS_H
7
8#include <asm/metag_mem.h>
9
10/*
11 * Definitions for MMU descriptors
12 *
13 * These are the hardware bits in the MMCU pte entries.
14 * Derived from the Meta toolkit headers.
15 */
16#define _PAGE_PRESENT		MMCU_ENTRY_VAL_BIT
17#define _PAGE_WRITE		MMCU_ENTRY_WR_BIT
18#define _PAGE_PRIV		MMCU_ENTRY_PRIV_BIT
19/* Write combine bit - this can cause writes to occur out of order */
20#define _PAGE_WR_COMBINE	MMCU_ENTRY_WRC_BIT
21/* Sys coherent bit - this bit is never used by Linux */
22#define _PAGE_SYS_COHERENT	MMCU_ENTRY_SYS_BIT
23#define _PAGE_ALWAYS_ZERO_1	0x020
24#define _PAGE_CACHE_CTRL0	0x040
25#define _PAGE_CACHE_CTRL1	0x080
26#define _PAGE_ALWAYS_ZERO_2	0x100
27#define _PAGE_ALWAYS_ZERO_3	0x200
28#define _PAGE_ALWAYS_ZERO_4	0x400
29#define _PAGE_ALWAYS_ZERO_5	0x800
30
31/* These are software bits that we stuff into the gaps in the hardware
32 * pte entries that are not used.  Note, these DO get stored in the actual
33 * hardware, but the hardware just does not use them.
34 */
35#define _PAGE_ACCESSED		_PAGE_ALWAYS_ZERO_1
36#define _PAGE_DIRTY		_PAGE_ALWAYS_ZERO_2
37
38/* Pages owned, and protected by, the kernel. */
39#define _PAGE_KERNEL		_PAGE_PRIV
40
41/* No cacheing of this page */
42#define _PAGE_CACHE_WIN0	(MMCU_CWIN_UNCACHED << MMCU_ENTRY_CWIN_S)
43/* burst cacheing - good for data streaming */
44#define _PAGE_CACHE_WIN1	(MMCU_CWIN_BURST << MMCU_ENTRY_CWIN_S)
45/* One cache way per thread */
46#define _PAGE_CACHE_WIN2	(MMCU_CWIN_C1SET << MMCU_ENTRY_CWIN_S)
47/* Full on cacheing */
48#define _PAGE_CACHE_WIN3	(MMCU_CWIN_CACHED << MMCU_ENTRY_CWIN_S)
49
50#define _PAGE_CACHEABLE		(_PAGE_CACHE_WIN3 | _PAGE_WR_COMBINE)
51
52/* which bits are used for cache control ... */
53#define _PAGE_CACHE_MASK	(_PAGE_CACHE_CTRL0 | _PAGE_CACHE_CTRL1 | \
54				 _PAGE_WR_COMBINE)
55
56/* This is a mask of the bits that pte_modify is allowed to change. */
57#define _PAGE_CHG_MASK		(PAGE_MASK)
58
59#define _PAGE_SZ_SHIFT		1
60#define _PAGE_SZ_4K		(0x0)
61#define _PAGE_SZ_8K		(0x1 << _PAGE_SZ_SHIFT)
62#define _PAGE_SZ_16K		(0x2 << _PAGE_SZ_SHIFT)
63#define _PAGE_SZ_32K		(0x3 << _PAGE_SZ_SHIFT)
64#define _PAGE_SZ_64K		(0x4 << _PAGE_SZ_SHIFT)
65#define _PAGE_SZ_128K		(0x5 << _PAGE_SZ_SHIFT)
66#define _PAGE_SZ_256K		(0x6 << _PAGE_SZ_SHIFT)
67#define _PAGE_SZ_512K		(0x7 << _PAGE_SZ_SHIFT)
68#define _PAGE_SZ_1M		(0x8 << _PAGE_SZ_SHIFT)
69#define _PAGE_SZ_2M		(0x9 << _PAGE_SZ_SHIFT)
70#define _PAGE_SZ_4M		(0xa << _PAGE_SZ_SHIFT)
71#define _PAGE_SZ_MASK		(0xf << _PAGE_SZ_SHIFT)
72
73#if defined(CONFIG_PAGE_SIZE_4K)
74#define _PAGE_SZ		(_PAGE_SZ_4K)
75#elif defined(CONFIG_PAGE_SIZE_8K)
76#define _PAGE_SZ		(_PAGE_SZ_8K)
77#elif defined(CONFIG_PAGE_SIZE_16K)
78#define _PAGE_SZ		(_PAGE_SZ_16K)
79#endif
80#define _PAGE_TABLE		(_PAGE_SZ | _PAGE_PRESENT)
81
82#if defined(CONFIG_HUGETLB_PAGE_SIZE_8K)
83# define _PAGE_SZHUGE		(_PAGE_SZ_8K)
84#elif defined(CONFIG_HUGETLB_PAGE_SIZE_16K)
85# define _PAGE_SZHUGE		(_PAGE_SZ_16K)
86#elif defined(CONFIG_HUGETLB_PAGE_SIZE_32K)
87# define _PAGE_SZHUGE		(_PAGE_SZ_32K)
88#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
89# define _PAGE_SZHUGE		(_PAGE_SZ_64K)
90#elif defined(CONFIG_HUGETLB_PAGE_SIZE_128K)
91# define _PAGE_SZHUGE		(_PAGE_SZ_128K)
92#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
93# define _PAGE_SZHUGE		(_PAGE_SZ_256K)
94#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
95# define _PAGE_SZHUGE		(_PAGE_SZ_512K)
96#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1M)
97# define _PAGE_SZHUGE		(_PAGE_SZ_1M)
98#elif defined(CONFIG_HUGETLB_PAGE_SIZE_2M)
99# define _PAGE_SZHUGE		(_PAGE_SZ_2M)
100#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4M)
101# define _PAGE_SZHUGE		(_PAGE_SZ_4M)
102#endif
103
104#endif /* _METAG_PGTABLE_BITS_H */
105