[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


/*
 * 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_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)

#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_SHIFT                3
#define _CACHE_MASK                 (7<<3)

#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)

#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_SHIFT		    9
#define _CACHE_MASK                 (7<<9)

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


/*
 * Cache attributes
 */
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)

#define _CACHE_CACHABLE_NONCOHERENT 0

#elif defined(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<<_CACHE_SHIFT)
#define _CACHE_CACHABLE_COW         (5<<_CACHE_SHIFT)
#define _CACHE_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)
#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)

#elif defined(CONFIG_CPU_RM9000)

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

#define _CACHE_UNCACHED		    _CACHE_UC_B
#define _CACHE_CACHABLE_NONCOHERENT _CACHE_WB

#else

#define _CACHE_CACHABLE_NO_WA	    (0<<_CACHE_SHIFT)  /* R4600 only      */
#define _CACHE_CACHABLE_WA	    (1<<_CACHE_SHIFT)  /* R4600 only      */
#define _CACHE_UNCACHED             (2<<_CACHE_SHIFT)  /* R4[0246]00      */
#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)  /* R4[0246]00      */
#define _CACHE_CACHABLE_CE          (4<<_CACHE_SHIFT)  /* R4[04]00MC only */
#define _CACHE_CACHABLE_COW         (5<<_CACHE_SHIFT)  /* R4[04]00MC only */
#define _CACHE_CACHABLE_COHERENT    (5<<_CACHE_SHIFT)  /* MIPS32R2 CMP    */
#define _CACHE_CACHABLE_CUW         (6<<_CACHE_SHIFT)  /* R4[04]00MC only */
#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)  /* R10000 only     */

#endif

#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)

#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
1da177e4 LT	13
	14	/*
	15	* Note that we shift the lower 32bits of each EntryLo[01] entry
	16	* 6 bits to the left. That way we can convert the PFN into the
	17	* physical address by a single 'and' operation and gain 6 additional
	18	* bits for storing information which isn't present in a normal
	19	* MIPS page table.
	20	*
	21	* Similar to the Alpha port, we need to keep track of the ref
	22	* and mod bits in software. We have a software "yeah you can read
	23	* from this page" bit, and a hardware one which actually lets the
	24	* process read from the page. On the same token we have a software
	25	* writable bit and the real hardware one which actually lets the
	26	* process write to the page, this keeps a mod bit via the hardware
	27	* dirty bit.
	28	*
	29	* Certain revisions of the R4000 and R5000 have a bug where if a
	30	* certain sequence occurs in the last 3 instructions of an executable
	31	* page, and the following page is not mapped, the cpu can do
	32	* unpredictable things. The code (when it is written) to deal with
	33	* this problem will be in the update_mmu_cache() code for the r4k.
	34	*/
962f480e	35	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
1da177e4 LT	36
	37	#define _PAGE_PRESENT (1<<6) /* implemented in software */
	38	#define _PAGE_READ (1<<7) /* implemented in software */
	39	#define _PAGE_WRITE (1<<8) /* implemented in software */
	40	#define _PAGE_ACCESSED (1<<9) /* implemented in software */
	41	#define _PAGE_MODIFIED (1<<10) /* implemented in software */
bec50527	42	#define _PAGE_FILE (1<<10) /* set:pagecache unset:swap */
1da177e4 LT	43
	44	#define _PAGE_R4KBUG (1<<0) /* workaround for r4k bug */
	45	#define _PAGE_GLOBAL (1<<0)
	46	#define _PAGE_VALID (1<<1)
	47	#define _PAGE_SILENT_READ (1<<1) /* synonym */
	48	#define _PAGE_DIRTY (1<<2) /* The MIPS dirty bit */
	49	#define _PAGE_SILENT_WRITE (1<<2)
bec50527	50	#define _CACHE_SHIFT 3
1da177e4 LT	51	#define _CACHE_MASK (7<<3)
1da177e4 LT	52
1da177e4 LT	53	#else
	54
	55	#define _PAGE_PRESENT (1<<0) /* implemented in software */
	56	#define _PAGE_READ (1<<1) /* implemented in software */
	57	#define _PAGE_WRITE (1<<2) /* implemented in software */
	58	#define _PAGE_ACCESSED (1<<3) /* implemented in software */
	59	#define _PAGE_MODIFIED (1<<4) /* implemented in software */
	60	#define _PAGE_FILE (1<<4) /* set:pagecache unset:swap */
	61
	62	#if defined(CONFIG_CPU_R3000) \|\| defined(CONFIG_CPU_TX39XX)
	63
	64	#define _PAGE_GLOBAL (1<<8)
	65	#define _PAGE_VALID (1<<9)
	66	#define _PAGE_SILENT_READ (1<<9) /* synonym */
	67	#define _PAGE_DIRTY (1<<10) /* The MIPS dirty bit */
	68	#define _PAGE_SILENT_WRITE (1<<10)
	69	#define _CACHE_UNCACHED (1<<11)
	70	#define _CACHE_MASK (1<<11)
1da177e4 LT	71
1da177e4 LT	72	#else
bec50527	73
1da177e4 LT	74	#define _PAGE_R4KBUG (1<<5) /* workaround for r4k bug */
	75	#define _PAGE_GLOBAL (1<<6)
	76	#define _PAGE_VALID (1<<7)
	77	#define _PAGE_SILENT_READ (1<<7) /* synonym */
	78	#define _PAGE_DIRTY (1<<8) /* The MIPS dirty bit */
	79	#define _PAGE_SILENT_WRITE (1<<8)
bec50527	80	#define _CACHE_SHIFT 9
1da177e4 LT	81	#define _CACHE_MASK (7<<9)
1da177e4 LT	82
bec50527 CD	83	#endif
	84	#endif /* defined(CONFIG_64BIT_PHYS_ADDR && defined(CONFIG_CPU_MIPS32) */
	85
	86
	87	/*
	88	* Cache attributes
	89	*/
	90	#if defined(CONFIG_CPU_R3000) \|\| defined(CONFIG_CPU_TX39XX)
	91
	92	#define _CACHE_CACHABLE_NONCOHERENT 0
	93
	94	#elif defined(CONFIG_CPU_SB1)
1da177e4 LT	95
	96	/* No penalty for being coherent on the SB1, so just
	97	use it for "noncoherent" spaces, too. Shouldn't hurt. */
	98
bec50527 CD	99	#define _CACHE_UNCACHED (2<<_CACHE_SHIFT)
	100	#define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT)
	101	#define _CACHE_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)
	102	#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)
1da177e4 LT	103
	104	#elif defined(CONFIG_CPU_RM9000)
	105
bec50527 CD	106	#define _CACHE_WT (0<<_CACHE_SHIFT)
	107	#define _CACHE_WTWA (1<<_CACHE_SHIFT)
	108	#define _CACHE_UC_B (2<<_CACHE_SHIFT)
	109	#define _CACHE_WB (3<<_CACHE_SHIFT)
	110	#define _CACHE_CWBEA (4<<_CACHE_SHIFT)
	111	#define _CACHE_CWB (5<<_CACHE_SHIFT)
	112	#define _CACHE_UCNB (6<<_CACHE_SHIFT)
	113	#define _CACHE_FPC (7<<_CACHE_SHIFT)
1da177e4	114
bec50527 CD	115	#define _CACHE_UNCACHED _CACHE_UC_B
bec50527 CD	116	#define _CACHE_CACHABLE_NONCOHERENT _CACHE_WB
1da177e4 LT	117
	118	#else
	119
bec50527 CD	120	#define _CACHE_CACHABLE_NO_WA (0<<_CACHE_SHIFT) /* R4600 only */
	121	#define _CACHE_CACHABLE_WA (1<<_CACHE_SHIFT) /* R4600 only */
	122	#define _CACHE_UNCACHED (2<<_CACHE_SHIFT) /* R4[0246]00 */
	123	#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT) /* R4[0246]00 */
	124	#define _CACHE_CACHABLE_CE (4<<_CACHE_SHIFT) /* R4[04]00MC only */
	125	#define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT) /* R4[04]00MC only */
	126	#define _CACHE_CACHABLE_COHERENT (5<<_CACHE_SHIFT) /* MIPS32R2 CMP */
	127	#define _CACHE_CACHABLE_CUW (6<<_CACHE_SHIFT) /* R4[04]00MC only */
	128	#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT) /* R10000 only */
1da177e4 LT	129
1da177e4 LT	130	#endif
1da177e4 LT	131
	132	#define __READABLE (_PAGE_READ \| _PAGE_SILENT_READ \| _PAGE_ACCESSED)
	133	#define __WRITEABLE (_PAGE_WRITE \| _PAGE_SILENT_WRITE \| _PAGE_MODIFIED)
	134
	135	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_MODIFIED \| _CACHE_MASK)
	136
1da177e4	137	#endif /* _ASM_PGTABLE_BITS_H */