[deliverable/linux.git] / include / asm-mips / pgtable-bits.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 2002 by Ralf Baechle
 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
 * Copyright (C) 2002  Maciej W. Rozycki
 */
#ifndef _ASM_PGTABLE_BITS_H
#define _ASM_PGTABLE_BITS_H

#include <linux/config.h>

/*
 * Note that we shift the lower 32bits of each EntryLo[01] entry
 * 6 bits to the left. That way we can convert the PFN into the
 * physical address by a single 'and' operation and gain 6 additional
 * bits for storing information which isn't present in a normal
 * MIPS page table.
 *
 * Similar to the Alpha port, we need to keep track of the ref
 * and mod bits in software.  We have a software "yeah you can read
 * from this page" bit, and a hardware one which actually lets the
 * process read from the page.  On the same token we have a software
 * writable bit and the real hardware one which actually lets the
 * process write to the page, this keeps a mod bit via the hardware
 * dirty bit.
 *
 * Certain revisions of the R4000 and R5000 have a bug where if a
 * certain sequence occurs in the last 3 instructions of an executable
 * page, and the following page is not mapped, the cpu can do
 * unpredictable things.  The code (when it is written) to deal with
 * this problem will be in the update_mmu_cache() code for the r4k.
 */
#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR)

#define _PAGE_PRESENT               (1<<6)  /* implemented in software */
#define _PAGE_READ                  (1<<7)  /* implemented in software */
#define _PAGE_WRITE                 (1<<8)  /* implemented in software */
#define _PAGE_ACCESSED              (1<<9)  /* implemented in software */
#define _PAGE_MODIFIED              (1<<10) /* implemented in software */
#define _PAGE_FILE                  (1<<10)  /* set:pagecache unset:swap */

#define _PAGE_R4KBUG                (1<<0)  /* workaround for r4k bug  */
#define _PAGE_GLOBAL                (1<<0)
#define _PAGE_VALID                 (1<<1)
#define _PAGE_SILENT_READ           (1<<1)  /* synonym                 */
#define _PAGE_DIRTY                 (1<<2)  /* The MIPS dirty bit      */
#define _PAGE_SILENT_WRITE          (1<<2)
#define _CACHE_MASK                 (7<<3)

/* MIPS32 defines only values 2 and 3. The rest are implementation
 * dependent.
 */
#define _CACHE_UNCACHED             (2<<3)
#define _CACHE_CACHABLE_NONCOHERENT (3<<3)
#define _CACHE_CACHABLE_COW         (3<<3)  /* Au1x                    */

#else

#define _PAGE_PRESENT               (1<<0)  /* implemented in software */
#define _PAGE_READ                  (1<<1)  /* implemented in software */
#define _PAGE_WRITE                 (1<<2)  /* implemented in software */
#define _PAGE_ACCESSED              (1<<3)  /* implemented in software */
#define _PAGE_MODIFIED              (1<<4)  /* implemented in software */
#define _PAGE_FILE                  (1<<4)  /* set:pagecache unset:swap */

#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)

#define _PAGE_GLOBAL                (1<<8)
#define _PAGE_VALID                 (1<<9)
#define _PAGE_SILENT_READ           (1<<9)  /* synonym                 */
#define _PAGE_DIRTY                 (1<<10) /* The MIPS dirty bit      */
#define _PAGE_SILENT_WRITE          (1<<10)
#define _CACHE_UNCACHED             (1<<11)
#define _CACHE_MASK                 (1<<11)
#define _CACHE_CACHABLE_NONCOHERENT 0

#else
#define _PAGE_R4KBUG                (1<<5)  /* workaround for r4k bug  */
#define _PAGE_GLOBAL                (1<<6)
#define _PAGE_VALID                 (1<<7)
#define _PAGE_SILENT_READ           (1<<7)  /* synonym                 */
#define _PAGE_DIRTY                 (1<<8)  /* The MIPS dirty bit      */
#define _PAGE_SILENT_WRITE          (1<<8)
#define _CACHE_MASK                 (7<<9)

#ifdef CONFIG_CPU_SB1

/* No penalty for being coherent on the SB1, so just
   use it for "noncoherent" spaces, too.  Shouldn't hurt. */

#define _CACHE_UNCACHED             (2<<9)
#define _CACHE_CACHABLE_COW         (5<<9)
#define _CACHE_CACHABLE_NONCOHERENT (5<<9)
#define _CACHE_UNCACHED_ACCELERATED (7<<9)

#elif defined(CONFIG_CPU_RM9000)

#define _CACHE_WT			(0 << 9)
#define _CACHE_WTWA			(1 << 9)
#define _CACHE_UC_B			(2 << 9)
#define _CACHE_WB			(3 << 9)
#define _CACHE_CWBEA			(4 << 9)
#define _CACHE_CWB			(5 << 9)
#define _CACHE_UCNB			(6 << 9)
#define _CACHE_FPC			(7 << 9)

#define _CACHE_UNCACHED			_CACHE_UC_B
#define _CACHE_CACHABLE_NONCOHERENT	_CACHE_WB

#else

#define _CACHE_CACHABLE_NO_WA       (0<<9)  /* R4600 only              */
#define _CACHE_CACHABLE_WA          (1<<9)  /* R4600 only              */
#define _CACHE_UNCACHED             (2<<9)  /* R4[0246]00              */
#define _CACHE_CACHABLE_NONCOHERENT (3<<9)  /* R4[0246]00              */
#define _CACHE_CACHABLE_CE          (4<<9)  /* R4[04]00MC only         */
#define _CACHE_CACHABLE_COW         (5<<9)  /* R4[04]00MC only         */
#define _CACHE_CACHABLE_CUW         (6<<9)  /* R4[04]00MC only         */
#define _CACHE_UNCACHED_ACCELERATED (7<<9)  /* R10000 only             */

#endif
#endif
#endif /* defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR) */

#define __READABLE	(_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
#define __WRITEABLE	(_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)

#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | _CACHE_MASK)

#ifdef CONFIG_MIPS_UNCACHED
#define PAGE_CACHABLE_DEFAULT	_CACHE_UNCACHED
#elif defined(CONFIG_DMA_NONCOHERENT)
#define PAGE_CACHABLE_DEFAULT	_CACHE_CACHABLE_NONCOHERENT
#elif defined(CONFIG_CPU_RM9000)
#define PAGE_CACHABLE_DEFAULT	_CACHE_CWB
#else
#define PAGE_CACHABLE_DEFAULT	_CACHE_CACHABLE_COW
#endif

#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR)
#define CONF_CM_DEFAULT		(PAGE_CACHABLE_DEFAULT >> 3)
#else
#define CONF_CM_DEFAULT		(PAGE_CACHABLE_DEFAULT >> 9)
#endif

#endif /* _ASM_PGTABLE_BITS_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1994 - 2002 by Ralf Baechle
	7	* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
	8	* Copyright (C) 2002 Maciej W. Rozycki
	9	*/
	10	#ifndef _ASM_PGTABLE_BITS_H
	11	#define _ASM_PGTABLE_BITS_H
	12
	13	#include <linux/config.h>
	14
	15	/*
	16	* Note that we shift the lower 32bits of each EntryLo[01] entry
	17	* 6 bits to the left. That way we can convert the PFN into the
	18	* physical address by a single 'and' operation and gain 6 additional
	19	* bits for storing information which isn't present in a normal
	20	* MIPS page table.
	21	*
	22	* Similar to the Alpha port, we need to keep track of the ref
	23	* and mod bits in software. We have a software "yeah you can read
	24	* from this page" bit, and a hardware one which actually lets the
	25	* process read from the page. On the same token we have a software
	26	* writable bit and the real hardware one which actually lets the
	27	* process write to the page, this keeps a mod bit via the hardware
	28	* dirty bit.
	29	*
	30	* Certain revisions of the R4000 and R5000 have a bug where if a
	31	* certain sequence occurs in the last 3 instructions of an executable
	32	* page, and the following page is not mapped, the cpu can do
	33	* unpredictable things. The code (when it is written) to deal with
	34	* this problem will be in the update_mmu_cache() code for the r4k.
	35	*/
	36	#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR)
	37
	38	#define _PAGE_PRESENT (1<<6) /* implemented in software */
	39	#define _PAGE_READ (1<<7) /* implemented in software */
	40	#define _PAGE_WRITE (1<<8) /* implemented in software */
	41	#define _PAGE_ACCESSED (1<<9) /* implemented in software */
	42	#define _PAGE_MODIFIED (1<<10) /* implemented in software */
	43	#define _PAGE_FILE (1<<10) /* set:pagecache unset:swap */
	44
	45	#define _PAGE_R4KBUG (1<<0) /* workaround for r4k bug */
	46	#define _PAGE_GLOBAL (1<<0)
	47	#define _PAGE_VALID (1<<1)
	48	#define _PAGE_SILENT_READ (1<<1) /* synonym */
	49	#define _PAGE_DIRTY (1<<2) /* The MIPS dirty bit */
	50	#define _PAGE_SILENT_WRITE (1<<2)
	51	#define _CACHE_MASK (7<<3)
	52
	53	/* MIPS32 defines only values 2 and 3. The rest are implementation
	54	* dependent.
	55	*/
	56	#define _CACHE_UNCACHED (2<<3)
	57	#define _CACHE_CACHABLE_NONCOHERENT (3<<3)
	58	#define _CACHE_CACHABLE_COW (3<<3) /* Au1x */
	59
	60	#else
	61
	62	#define _PAGE_PRESENT (1<<0) /* implemented in software */
	63	#define _PAGE_READ (1<<1) /* implemented in software */
	64	#define _PAGE_WRITE (1<<2) /* implemented in software */
65	#define _PAGE_ACCESSED (1<<3) /* implemented in software */
66	#define _PAGE_MODIFIED (1<<4) /* implemented in software */
67	#define _PAGE_FILE (1<<4) /* set:pagecache unset:swap */
68
69	#if defined(CONFIG_CPU_R3000) \|\| defined(CONFIG_CPU_TX39XX)
70
71	#define _PAGE_GLOBAL (1<<8)
72	#define _PAGE_VALID (1<<9)
73	#define _PAGE_SILENT_READ (1<<9) /* synonym */
74	#define _PAGE_DIRTY (1<<10) /* The MIPS dirty bit */
75	#define _PAGE_SILENT_WRITE (1<<10)
76	#define _CACHE_UNCACHED (1<<11)
77	#define _CACHE_MASK (1<<11)
78	#define _CACHE_CACHABLE_NONCOHERENT 0
79
80	#else
81	#define _PAGE_R4KBUG (1<<5) /* workaround for r4k bug */
82	#define _PAGE_GLOBAL (1<<6)
83	#define _PAGE_VALID (1<<7)
84	#define _PAGE_SILENT_READ (1<<7) /* synonym */
85	#define _PAGE_DIRTY (1<<8) /* The MIPS dirty bit */
86	#define _PAGE_SILENT_WRITE (1<<8)
87	#define _CACHE_MASK (7<<9)
88
89	#ifdef CONFIG_CPU_SB1
90
91	/* No penalty for being coherent on the SB1, so just
92	use it for "noncoherent" spaces, too. Shouldn't hurt. */
93
94	#define _CACHE_UNCACHED (2<<9)
95	#define _CACHE_CACHABLE_COW (5<<9)
96	#define _CACHE_CACHABLE_NONCOHERENT (5<<9)
97	#define _CACHE_UNCACHED_ACCELERATED (7<<9)
98
99	#elif defined(CONFIG_CPU_RM9000)
100
101	#define _CACHE_WT (0 << 9)
102	#define _CACHE_WTWA (1 << 9)
103	#define _CACHE_UC_B (2 << 9)
104	#define _CACHE_WB (3 << 9)
105	#define _CACHE_CWBEA (4 << 9)
106	#define _CACHE_CWB (5 << 9)
107	#define _CACHE_UCNB (6 << 9)
108	#define _CACHE_FPC (7 << 9)
109
110	#define _CACHE_UNCACHED _CACHE_UC_B
111	#define _CACHE_CACHABLE_NONCOHERENT _CACHE_WB
112
113	#else
114
115	#define _CACHE_CACHABLE_NO_WA (0<<9) /* R4600 only */
116	#define _CACHE_CACHABLE_WA (1<<9) /* R4600 only */
117	#define _CACHE_UNCACHED (2<<9) /* R4[0246]00 */
118	#define _CACHE_CACHABLE_NONCOHERENT (3<<9) /* R4[0246]00 */
119	#define _CACHE_CACHABLE_CE (4<<9) /* R4[04]00MC only */
120	#define _CACHE_CACHABLE_COW (5<<9) /* R4[04]00MC only */
121	#define _CACHE_CACHABLE_CUW (6<<9) /* R4[04]00MC only */
122	#define _CACHE_UNCACHED_ACCELERATED (7<<9) /* R10000 only */
123
124	#endif
125	#endif
126	#endif /* defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR) */
127
128	#define __READABLE (_PAGE_READ \| _PAGE_SILENT_READ \| _PAGE_ACCESSED)
129	#define __WRITEABLE (_PAGE_WRITE \| _PAGE_SILENT_WRITE \| _PAGE_MODIFIED)
130
131	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_MODIFIED \| _CACHE_MASK)
132
133	#ifdef CONFIG_MIPS_UNCACHED
134	#define PAGE_CACHABLE_DEFAULT _CACHE_UNCACHED
135	#elif defined(CONFIG_DMA_NONCOHERENT)
136	#define PAGE_CACHABLE_DEFAULT _CACHE_CACHABLE_NONCOHERENT
137	#elif defined(CONFIG_CPU_RM9000)
138	#define PAGE_CACHABLE_DEFAULT _CACHE_CWB
139	#else
140	#define PAGE_CACHABLE_DEFAULT _CACHE_CACHABLE_COW
141	#endif
142
143	#if defined(CONFIG_CPU_MIPS32) && defined(CONFIG_64BIT_PHYS_ADDR)
144	#define CONF_CM_DEFAULT (PAGE_CACHABLE_DEFAULT >> 3)
145	#else
146	#define CONF_CM_DEFAULT (PAGE_CACHABLE_DEFAULT >> 9)
147	#endif
148
149	#endif /* _ASM_PGTABLE_BITS_H */