arch/mips/include/asm/pgtable-bits.h - kernel/bruno - Git at Google

 /*
  * 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_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)

 /*
  * The following bits are implemented by the TLB hardware
  */
 #define _PAGE_NO_EXEC_SHIFT	0
 #define _PAGE_NO_EXEC		(1 << _PAGE_NO_EXEC_SHIFT)
 #define _PAGE_NO_READ_SHIFT	(_PAGE_NO_EXEC_SHIFT + 1)
 #define _PAGE_NO_READ		(1 << _PAGE_NO_READ_SHIFT)
 #define _PAGE_GLOBAL_SHIFT	(_PAGE_NO_READ_SHIFT + 1)
 #define _PAGE_GLOBAL		(1 << _PAGE_GLOBAL_SHIFT)
 #define _PAGE_VALID_SHIFT	(_PAGE_GLOBAL_SHIFT + 1)
 #define _PAGE_VALID		(1 << _PAGE_VALID_SHIFT)
 #define _PAGE_DIRTY_SHIFT	(_PAGE_VALID_SHIFT + 1)
 #define _PAGE_DIRTY		(1 << _PAGE_DIRTY_SHIFT)
 #define _CACHE_SHIFT		(_PAGE_DIRTY_SHIFT + 1)
 #define _CACHE_MASK		(7 << _CACHE_SHIFT)

 /*
  * The following bits are implemented in software
  */
 #define _PAGE_PRESENT_SHIFT	(24)
 #define _PAGE_PRESENT		(1 << _PAGE_PRESENT_SHIFT)
 #define _PAGE_READ_SHIFT	(_PAGE_PRESENT_SHIFT + 1)
 #define _PAGE_READ		(1 << _PAGE_READ_SHIFT)
 #define _PAGE_WRITE_SHIFT	(_PAGE_READ_SHIFT + 1)
 #define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)
 #define _PAGE_ACCESSED_SHIFT	(_PAGE_WRITE_SHIFT + 1)
 #define _PAGE_ACCESSED		(1 << _PAGE_ACCESSED_SHIFT)
 #define _PAGE_MODIFIED_SHIFT	(_PAGE_ACCESSED_SHIFT + 1)
 #define _PAGE_MODIFIED		(1 << _PAGE_MODIFIED_SHIFT)

 #define _PFN_SHIFT		(PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)

 /*
  * Bits for extended EntryLo0/EntryLo1 registers
  */
 #define _PFNX_MASK		0xffffff

 #elif defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)

 /*
  * The following bits are implemented in software
  */
 #define _PAGE_PRESENT_SHIFT	(0)
 #define _PAGE_PRESENT		(1 << _PAGE_PRESENT_SHIFT)
 #define _PAGE_READ_SHIFT	(_PAGE_PRESENT_SHIFT + 1)
 #define _PAGE_READ		(1 << _PAGE_READ_SHIFT)
 #define _PAGE_WRITE_SHIFT	(_PAGE_READ_SHIFT + 1)
 #define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)
 #define _PAGE_ACCESSED_SHIFT	(_PAGE_WRITE_SHIFT + 1)
 #define _PAGE_ACCESSED		(1 << _PAGE_ACCESSED_SHIFT)
 #define _PAGE_MODIFIED_SHIFT	(_PAGE_ACCESSED_SHIFT + 1)
 #define _PAGE_MODIFIED		(1 << _PAGE_MODIFIED_SHIFT)

 /*
  * The following bits are implemented by the TLB hardware
  */
 #define _PAGE_GLOBAL_SHIFT	(_PAGE_MODIFIED_SHIFT + 4)
 #define _PAGE_GLOBAL		(1 << _PAGE_GLOBAL_SHIFT)
 #define _PAGE_VALID_SHIFT	(_PAGE_GLOBAL_SHIFT + 1)
 #define _PAGE_VALID		(1 << _PAGE_VALID_SHIFT)
 #define _PAGE_DIRTY_SHIFT	(_PAGE_VALID_SHIFT + 1)
 #define _PAGE_DIRTY		(1 << _PAGE_DIRTY_SHIFT)
 #define _CACHE_UNCACHED_SHIFT	(_PAGE_DIRTY_SHIFT + 1)
 #define _CACHE_UNCACHED		(1 << _CACHE_UNCACHED_SHIFT)
 #define _CACHE_MASK		_CACHE_UNCACHED

 #define _PFN_SHIFT		PAGE_SHIFT

 #else
 /*
  * Below are the "Normal" R4K cases
  */

 /*
  * The following bits are implemented in software
  */
 #define _PAGE_PRESENT_SHIFT	0
 #define _PAGE_PRESENT		(1 << _PAGE_PRESENT_SHIFT)
 /* R2 or later cores check for RI/XI support to determine _PAGE_READ */
 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
 #define _PAGE_WRITE_SHIFT	(_PAGE_PRESENT_SHIFT + 1)
 #define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)
 #else
 #define _PAGE_READ_SHIFT	(_PAGE_PRESENT_SHIFT + 1)
 #define _PAGE_READ		(1 << _PAGE_READ_SHIFT)
 #define _PAGE_WRITE_SHIFT	(_PAGE_READ_SHIFT + 1)
 #define _PAGE_WRITE		(1 << _PAGE_WRITE_SHIFT)
 #endif
 #define _PAGE_ACCESSED_SHIFT	(_PAGE_WRITE_SHIFT + 1)
 #define _PAGE_ACCESSED		(1 << _PAGE_ACCESSED_SHIFT)
 #define _PAGE_MODIFIED_SHIFT	(_PAGE_ACCESSED_SHIFT + 1)
 #define _PAGE_MODIFIED		(1 << _PAGE_MODIFIED_SHIFT)

 #if defined(CONFIG_64BIT) && defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
 /* Huge TLB page */
 #define _PAGE_HUGE_SHIFT	(_PAGE_MODIFIED_SHIFT + 1)
 #define _PAGE_HUGE		(1 << _PAGE_HUGE_SHIFT)
 #define _PAGE_SPLITTING_SHIFT	(_PAGE_HUGE_SHIFT + 1)
 #define _PAGE_SPLITTING		(1 << _PAGE_SPLITTING_SHIFT)
 #endif	/* CONFIG_64BIT && CONFIG_MIPS_HUGE_TLB_SUPPORT */

 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
 /* XI - page cannot be executed */
 #ifdef _PAGE_SPLITTING_SHIFT
 #define _PAGE_NO_EXEC_SHIFT	(_PAGE_SPLITTING_SHIFT + 1)
 #else
 #define _PAGE_NO_EXEC_SHIFT	(_PAGE_MODIFIED_SHIFT + 1)
 #endif
 #define _PAGE_NO_EXEC		(cpu_has_rixi ? (1 << _PAGE_NO_EXEC_SHIFT) : 0)

 /* RI - page cannot be read */
 #define _PAGE_READ_SHIFT	(_PAGE_NO_EXEC_SHIFT + 1)
 #define _PAGE_READ		(cpu_has_rixi ? 0 : (1 << _PAGE_READ_SHIFT))
 #define _PAGE_NO_READ_SHIFT	_PAGE_READ_SHIFT
 #define _PAGE_NO_READ		(cpu_has_rixi ? (1 << _PAGE_READ_SHIFT) : 0)
 #endif	/* defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) */

 #if defined(_PAGE_NO_READ_SHIFT)
 #define _PAGE_GLOBAL_SHIFT	(_PAGE_NO_READ_SHIFT + 1)
 #elif defined(_PAGE_SPLITTING_SHIFT)
 #define _PAGE_GLOBAL_SHIFT	(_PAGE_SPLITTING_SHIFT + 1)
 #else
 #define _PAGE_GLOBAL_SHIFT	(_PAGE_MODIFIED_SHIFT + 1)
 #endif
 #define _PAGE_GLOBAL		(1 << _PAGE_GLOBAL_SHIFT)

 #define _PAGE_VALID_SHIFT	(_PAGE_GLOBAL_SHIFT + 1)
 #define _PAGE_VALID		(1 << _PAGE_VALID_SHIFT)
 #define _PAGE_DIRTY_SHIFT	(_PAGE_VALID_SHIFT + 1)
 #define _PAGE_DIRTY		(1 << _PAGE_DIRTY_SHIFT)
 #define _CACHE_SHIFT		(_PAGE_DIRTY_SHIFT + 1)
 #define _CACHE_MASK		(7 << _CACHE_SHIFT)

 #define _PFN_SHIFT		(PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)

 #endif /* defined(CONFIG_PHYS_ADDR_T_64BIT && defined(CONFIG_CPU_MIPS32) */

 #ifndef _PAGE_NO_EXEC
 #define _PAGE_NO_EXEC		0
 #endif
 #ifndef _PAGE_NO_READ
 #define _PAGE_NO_READ		0
 #endif

 #define _PAGE_SILENT_READ	_PAGE_VALID
 #define _PAGE_SILENT_WRITE	_PAGE_DIRTY

 #define _PFN_MASK		(~((1 << (_PFN_SHIFT)) - 1))

 /*
  * The final layouts of the PTE bits are:
  *
  *   64-bit, R1 or earlier:     CCC D V G [S H] M A W R P
  *   32-bit, R1 or earler:      CCC D V G M A W R P
  *   64-bit, R2 or later:       CCC D V G RI/R XI [S H] M A W P
  *   32-bit, R2 or later:       CCC D V G RI/R XI M A W P
  */


 #ifndef __ASSEMBLY__
 /*
  * pte_to_entrylo converts a page table entry (PTE) into a Mips
  * entrylo0/1 value.
  */
 static inline uint64_t pte_to_entrylo(unsigned long pte_val)
 {
 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
 	if (cpu_has_rixi) {
 		int sa;
 #ifdef CONFIG_32BIT
 		sa = 31 - _PAGE_NO_READ_SHIFT;
 #else
 		sa = 63 - _PAGE_NO_READ_SHIFT;
 #endif
 		/*
 		 * C has no way to express that this is a DSRL
 		 * _PAGE_NO_EXEC_SHIFT followed by a ROTR 2.  Luckily
 		 * in the fast path this is done in assembly
 		 */
 		return (pte_val >> _PAGE_GLOBAL_SHIFT) |
 			((pte_val & (_PAGE_NO_EXEC | _PAGE_NO_READ)) << sa);
 	}
 #endif

 	return pte_val >> _PAGE_GLOBAL_SHIFT;
 }
 #endif

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

 #define _CACHE_CACHABLE_NONCOHERENT 0
 #define _CACHE_UNCACHED_ACCELERATED _CACHE_UNCACHED

 #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_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)

 #elif defined(CONFIG_CPU_LOONGSON3)

 /* Using COHERENT flag for NONCOHERENT doesn't hurt. */

 #define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)  /* LOONGSON       */
 #define _CACHE_CACHABLE_COHERENT    (3<<_CACHE_SHIFT)  /* LOONGSON-3     */

 #elif defined(CONFIG_MACH_INGENIC)

 /* Ingenic uses the WA bit to achieve write-combine memory writes */
 #define _CACHE_UNCACHED_ACCELERATED (1<<_CACHE_SHIFT)

 #endif

 #ifndef _CACHE_CACHABLE_NO_WA
 #define _CACHE_CACHABLE_NO_WA		(0<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_CACHABLE_WA
 #define _CACHE_CACHABLE_WA		(1<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_UNCACHED
 #define _CACHE_UNCACHED			(2<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_CACHABLE_NONCOHERENT
 #define _CACHE_CACHABLE_NONCOHERENT	(3<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_CACHABLE_CE
 #define _CACHE_CACHABLE_CE		(4<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_CACHABLE_COW
 #define _CACHE_CACHABLE_COW		(5<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_CACHABLE_CUW
 #define _CACHE_CACHABLE_CUW		(6<<_CACHE_SHIFT)
 #endif
 #ifndef _CACHE_UNCACHED_ACCELERATED
 #define _CACHE_UNCACHED_ACCELERATED	(7<<_CACHE_SHIFT)
 #endif

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

 #define _PAGE_CHG_MASK	(_PAGE_ACCESSED | _PAGE_MODIFIED |	\
 			 _PFN_MASK | _CACHE_MASK)

 #endif /* _ASM_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_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)

	/*
	* The following bits are implemented by the TLB hardware
	*/
	#define _PAGE_NO_EXEC_SHIFT 0
	#define _PAGE_NO_EXEC (1 << _PAGE_NO_EXEC_SHIFT)
	#define _PAGE_NO_READ_SHIFT (_PAGE_NO_EXEC_SHIFT + 1)
	#define _PAGE_NO_READ (1 << _PAGE_NO_READ_SHIFT)
	#define _PAGE_GLOBAL_SHIFT (_PAGE_NO_READ_SHIFT + 1)
	#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
	#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
	#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
	#define _PAGE_DIRTY_SHIFT (_PAGE_VALID_SHIFT + 1)
	#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
	#define _CACHE_SHIFT (_PAGE_DIRTY_SHIFT + 1)
	#define _CACHE_MASK (7 << _CACHE_SHIFT)

	/*
	* The following bits are implemented in software
	*/
	#define _PAGE_PRESENT_SHIFT (24)
	#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
	#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
	#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
	#define _PAGE_WRITE_SHIFT (_PAGE_READ_SHIFT + 1)
	#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
	#define _PAGE_ACCESSED_SHIFT (_PAGE_WRITE_SHIFT + 1)
	#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
	#define _PAGE_MODIFIED_SHIFT (_PAGE_ACCESSED_SHIFT + 1)
	#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)

	#define _PFN_SHIFT (PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)

	/*
	* Bits for extended EntryLo0/EntryLo1 registers
	*/
	#define _PFNX_MASK 0xffffff

	#elif defined(CONFIG_CPU_R3000) \|\| defined(CONFIG_CPU_TX39XX)

	/*
	* The following bits are implemented in software
	*/
	#define _PAGE_PRESENT_SHIFT (0)
	#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
	#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
	#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
	#define _PAGE_WRITE_SHIFT (_PAGE_READ_SHIFT + 1)
	#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
	#define _PAGE_ACCESSED_SHIFT (_PAGE_WRITE_SHIFT + 1)
	#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
	#define _PAGE_MODIFIED_SHIFT (_PAGE_ACCESSED_SHIFT + 1)
	#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)

	/*
	* The following bits are implemented by the TLB hardware
	*/
	#define _PAGE_GLOBAL_SHIFT (_PAGE_MODIFIED_SHIFT + 4)
	#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)
	#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
	#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
	#define _PAGE_DIRTY_SHIFT (_PAGE_VALID_SHIFT + 1)
	#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
	#define _CACHE_UNCACHED_SHIFT (_PAGE_DIRTY_SHIFT + 1)
	#define _CACHE_UNCACHED (1 << _CACHE_UNCACHED_SHIFT)
	#define _CACHE_MASK _CACHE_UNCACHED

	#define _PFN_SHIFT PAGE_SHIFT

	#else
	/*
	* Below are the "Normal" R4K cases
	*/

	/*
	* The following bits are implemented in software
	*/
	#define _PAGE_PRESENT_SHIFT 0
	#define _PAGE_PRESENT (1 << _PAGE_PRESENT_SHIFT)
	/* R2 or later cores check for RI/XI support to determine _PAGE_READ */
	#if defined(CONFIG_CPU_MIPSR2) \|\| defined(CONFIG_CPU_MIPSR6)
	#define _PAGE_WRITE_SHIFT (_PAGE_PRESENT_SHIFT + 1)
	#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
	#else
	#define _PAGE_READ_SHIFT (_PAGE_PRESENT_SHIFT + 1)
	#define _PAGE_READ (1 << _PAGE_READ_SHIFT)
	#define _PAGE_WRITE_SHIFT (_PAGE_READ_SHIFT + 1)
	#define _PAGE_WRITE (1 << _PAGE_WRITE_SHIFT)
	#endif
	#define _PAGE_ACCESSED_SHIFT (_PAGE_WRITE_SHIFT + 1)
	#define _PAGE_ACCESSED (1 << _PAGE_ACCESSED_SHIFT)
	#define _PAGE_MODIFIED_SHIFT (_PAGE_ACCESSED_SHIFT + 1)
	#define _PAGE_MODIFIED (1 << _PAGE_MODIFIED_SHIFT)

	#if defined(CONFIG_64BIT) && defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
	/* Huge TLB page */
	#define _PAGE_HUGE_SHIFT (_PAGE_MODIFIED_SHIFT + 1)
	#define _PAGE_HUGE (1 << _PAGE_HUGE_SHIFT)
	#define _PAGE_SPLITTING_SHIFT (_PAGE_HUGE_SHIFT + 1)
	#define _PAGE_SPLITTING (1 << _PAGE_SPLITTING_SHIFT)
	#endif /* CONFIG_64BIT && CONFIG_MIPS_HUGE_TLB_SUPPORT */

	#if defined(CONFIG_CPU_MIPSR2) \|\| defined(CONFIG_CPU_MIPSR6)
	/* XI - page cannot be executed */
	#ifdef _PAGE_SPLITTING_SHIFT
	#define _PAGE_NO_EXEC_SHIFT (_PAGE_SPLITTING_SHIFT + 1)
	#else
	#define _PAGE_NO_EXEC_SHIFT (_PAGE_MODIFIED_SHIFT + 1)
	#endif
	#define _PAGE_NO_EXEC (cpu_has_rixi ? (1 << _PAGE_NO_EXEC_SHIFT) : 0)

	/* RI - page cannot be read */
	#define _PAGE_READ_SHIFT (_PAGE_NO_EXEC_SHIFT + 1)
	#define _PAGE_READ (cpu_has_rixi ? 0 : (1 << _PAGE_READ_SHIFT))
	#define _PAGE_NO_READ_SHIFT _PAGE_READ_SHIFT
	#define _PAGE_NO_READ (cpu_has_rixi ? (1 << _PAGE_READ_SHIFT) : 0)
	#endif /* defined(CONFIG_CPU_MIPSR2) \|\| defined(CONFIG_CPU_MIPSR6) */

	#if defined(_PAGE_NO_READ_SHIFT)
	#define _PAGE_GLOBAL_SHIFT (_PAGE_NO_READ_SHIFT + 1)
	#elif defined(_PAGE_SPLITTING_SHIFT)
	#define _PAGE_GLOBAL_SHIFT (_PAGE_SPLITTING_SHIFT + 1)
	#else
	#define _PAGE_GLOBAL_SHIFT (_PAGE_MODIFIED_SHIFT + 1)
	#endif
	#define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT)

	#define _PAGE_VALID_SHIFT (_PAGE_GLOBAL_SHIFT + 1)
	#define _PAGE_VALID (1 << _PAGE_VALID_SHIFT)
	#define _PAGE_DIRTY_SHIFT (_PAGE_VALID_SHIFT + 1)
	#define _PAGE_DIRTY (1 << _PAGE_DIRTY_SHIFT)
	#define _CACHE_SHIFT (_PAGE_DIRTY_SHIFT + 1)
	#define _CACHE_MASK (7 << _CACHE_SHIFT)

	#define _PFN_SHIFT (PAGE_SHIFT - 12 + _CACHE_SHIFT + 3)

	#endif /* defined(CONFIG_PHYS_ADDR_T_64BIT && defined(CONFIG_CPU_MIPS32) */

	#ifndef _PAGE_NO_EXEC
	#define _PAGE_NO_EXEC 0
	#endif
	#ifndef _PAGE_NO_READ
	#define _PAGE_NO_READ 0
	#endif

	#define _PAGE_SILENT_READ _PAGE_VALID
	#define _PAGE_SILENT_WRITE _PAGE_DIRTY

	#define _PFN_MASK (~((1 << (_PFN_SHIFT)) - 1))

	/*
	* The final layouts of the PTE bits are:
	*
	* 64-bit, R1 or earlier: CCC D V G [S H] M A W R P
	* 32-bit, R1 or earler: CCC D V G M A W R P
	* 64-bit, R2 or later: CCC D V G RI/R XI [S H] M A W P
	* 32-bit, R2 or later: CCC D V G RI/R XI M A W P
	*/


	#ifndef __ASSEMBLY__
	/*
	* pte_to_entrylo converts a page table entry (PTE) into a Mips
	* entrylo0/1 value.
	*/
	static inline uint64_t pte_to_entrylo(unsigned long pte_val)
	{
	#if defined(CONFIG_CPU_MIPSR2) \|\| defined(CONFIG_CPU_MIPSR6)
	if (cpu_has_rixi) {
	int sa;
	#ifdef CONFIG_32BIT
	sa = 31 - _PAGE_NO_READ_SHIFT;
	#else
	sa = 63 - _PAGE_NO_READ_SHIFT;
	#endif
	/*
	* C has no way to express that this is a DSRL
	* _PAGE_NO_EXEC_SHIFT followed by a ROTR 2. Luckily
	* in the fast path this is done in assembly
	*/
	return (pte_val >> _PAGE_GLOBAL_SHIFT) \|
	((pte_val & (_PAGE_NO_EXEC \| _PAGE_NO_READ)) << sa);
	}
	#endif

	return pte_val >> _PAGE_GLOBAL_SHIFT;
	}
	#endif

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

	#define _CACHE_CACHABLE_NONCOHERENT 0
	#define _CACHE_UNCACHED_ACCELERATED _CACHE_UNCACHED

	#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_CACHABLE_NONCOHERENT (5<<_CACHE_SHIFT)

	#elif defined(CONFIG_CPU_LOONGSON3)

	/* Using COHERENT flag for NONCOHERENT doesn't hurt. */

	#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT) /* LOONGSON */
	#define _CACHE_CACHABLE_COHERENT (3<<_CACHE_SHIFT) /* LOONGSON-3 */

	#elif defined(CONFIG_MACH_INGENIC)

	/* Ingenic uses the WA bit to achieve write-combine memory writes */
	#define _CACHE_UNCACHED_ACCELERATED (1<<_CACHE_SHIFT)

	#endif

	#ifndef _CACHE_CACHABLE_NO_WA
	#define _CACHE_CACHABLE_NO_WA (0<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_CACHABLE_WA
	#define _CACHE_CACHABLE_WA (1<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_UNCACHED
	#define _CACHE_UNCACHED (2<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_CACHABLE_NONCOHERENT
	#define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_CACHABLE_CE
	#define _CACHE_CACHABLE_CE (4<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_CACHABLE_COW
	#define _CACHE_CACHABLE_COW (5<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_CACHABLE_CUW
	#define _CACHE_CACHABLE_CUW (6<<_CACHE_SHIFT)
	#endif
	#ifndef _CACHE_UNCACHED_ACCELERATED
	#define _CACHE_UNCACHED_ACCELERATED (7<<_CACHE_SHIFT)
	#endif

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

	#define _PAGE_CHG_MASK (_PAGE_ACCESSED \| _PAGE_MODIFIED \| \
	_PFN_MASK \| _CACHE_MASK)

	#endif /* _ASM_PGTABLE_BITS_H */