arch/mips/include/asm/pgtable-32.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, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
  * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
  */
 #ifndef _ASM_PGTABLE_32_H
 #define _ASM_PGTABLE_32_H

 #include <asm/addrspace.h>
 #include <asm/page.h>

 #include <linux/linkage.h>
 #include <asm/cachectl.h>
 #include <asm/fixmap.h>

 #include <asm-generic/pgtable-nopmd.h>

 extern int temp_tlb_entry;

 /*
  * - add_temporary_entry() add a temporary TLB entry. We use TLB entries
  *	starting at the top and working down. This is for populating the
  *	TLB before trap_init() puts the TLB miss handler in place. It
  *	should be used only for entries matching the actual page tables,
  *	to prevent inconsistencies.
  */
 extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
 			       unsigned long entryhi, unsigned long pagemask);

 /*
  * Basically we have the same two-level (which is the logical three level
  * Linux page table layout folded) page tables as the i386.  Some day
  * when we have proper page coloring support we can have a 1% quicker
  * tlb refill handling mechanism, but for now it is a bit slower but
  * works even with the cache aliasing problem the R4k and above have.
  */

 /* PGDIR_SHIFT determines what a third-level page table entry can map */
 #define PGDIR_SHIFT	(2 * PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2)
 #define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))

 /*
  * Entries per page directory level: we use two-level, so
  * we don't really have any PUD/PMD directory physically.
  */
 #define __PGD_ORDER	(32 - 3 * PAGE_SHIFT + PGD_T_LOG2 + PTE_T_LOG2)
 #define PGD_ORDER	(__PGD_ORDER >= 0 ? __PGD_ORDER : 0)
 #define PUD_ORDER	aieeee_attempt_to_allocate_pud
 #define PMD_ORDER	1
 #define PTE_ORDER	0

 #define PTRS_PER_PGD	(USER_PTRS_PER_PGD * 2)
 #define PTRS_PER_PTE	((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))

 #define USER_PTRS_PER_PGD	(0x80000000UL/PGDIR_SIZE)
 #define FIRST_USER_ADDRESS	0UL

 #define VMALLOC_START	  MAP_BASE

 #define PKMAP_BASE		(0xfe000000UL)

 #ifdef CONFIG_HIGHMEM
 # define VMALLOC_END	(PKMAP_BASE-2*PAGE_SIZE)
 #else
 # define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)
 #endif

 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 #define pte_ERROR(e) \
 	printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
 #else
 #define pte_ERROR(e) \
 	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 #endif
 #define pgd_ERROR(e) \
 	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))

 extern void load_pgd(unsigned long pg_dir);

 extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];

 /*
  * Empty pgd/pmd entries point to the invalid_pte_table.
  */
 static inline int pmd_none(pmd_t pmd)
 {
 	return pmd_val(pmd) == (unsigned long) invalid_pte_table;
 }

 #define pmd_bad(pmd)		(pmd_val(pmd) & ~PAGE_MASK)

 static inline int pmd_present(pmd_t pmd)
 {
 	return pmd_val(pmd) != (unsigned long) invalid_pte_table;
 }

 static inline void pmd_clear(pmd_t *pmdp)
 {
 	pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
 }

 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 #define pte_pfn(x)		(((unsigned long)((x).pte_high >> _PFN_SHIFT)) | (unsigned long)((x).pte_low << _PAGE_PRESENT_SHIFT))
 static inline pte_t
 pfn_pte(unsigned long pfn, pgprot_t prot)
 {
 	pte_t pte;

 	pte.pte_low = (pfn >> _PAGE_PRESENT_SHIFT) |
 				(pgprot_val(prot) & ~_PFNX_MASK);
 	pte.pte_high = (pfn << _PFN_SHIFT) |
 				(pgprot_val(prot) & ~_PFN_MASK);
 	return pte;
 }

 #else

 #define pte_page(x)		pfn_to_page(pte_pfn(x))

 #ifdef CONFIG_CPU_VR41XX
 #define pte_pfn(x)		((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
 #define pfn_pte(pfn, prot)	__pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
 #else
 #define pte_pfn(x)		((unsigned long)((x).pte >> _PFN_SHIFT))
 #define pfn_pte(pfn, prot)	__pte(((unsigned long long)(pfn) << _PFN_SHIFT) | pgprot_val(prot))
 #endif
 #endif /* defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) */

 #define __pgd_offset(address)	pgd_index(address)
 #define __pud_offset(address)	(((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 #define __pmd_offset(address)	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))

 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(address) pgd_offset(&init_mm, address)

 #define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))

 /* to find an entry in a page-table-directory */
 #define pgd_offset(mm, addr)	((mm)->pgd + pgd_index(addr))

 /* Find an entry in the third-level page table.. */
 #define __pte_offset(address)						\
 	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 #define pte_offset(dir, address)					\
 	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
 #define pte_offset_kernel(dir, address)					\
 	((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))

 #define pte_offset_map(dir, address)					\
 	((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
 #define pte_unmap(pte) ((void)(pte))

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

 /* Swap entries must have VALID bit cleared. */
 #define __swp_type(x)			(((x).val >> 10) & 0x1f)
 #define __swp_offset(x)			((x).val >> 15)
 #define __swp_entry(type,offset)	((swp_entry_t) { ((type) << 10) | ((offset) << 15) })
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })

 #else

 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)

 /* Swap entries must have VALID and GLOBAL bits cleared. */
 #define __swp_type(x)			(((x).val >> 4) & 0x1f)
 #define __swp_offset(x)			 ((x).val >> 9)
 #define __swp_entry(type,offset)	((swp_entry_t)  { ((type) << 4) | ((offset) << 9) })
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { (pte).pte_high })
 #define __swp_entry_to_pte(x)		((pte_t) { 0, (x).val })

 #else
 /*
  * Constraints:
  *      _PAGE_PRESENT at bit 0
  *      _PAGE_MODIFIED at bit 4
  *      _PAGE_GLOBAL at bit 6
  *      _PAGE_VALID at bit 7
  */
 #define __swp_type(x)			(((x).val >> 8) & 0x1f)
 #define __swp_offset(x)			 ((x).val >> 13)
 #define __swp_entry(type,offset)	((swp_entry_t)	{ ((type) << 8) | ((offset) << 13) })
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })

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

 #endif /* defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) */

 #endif /* _ASM_PGTABLE_32_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, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
	* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
	*/
	#ifndef _ASM_PGTABLE_32_H
	#define _ASM_PGTABLE_32_H

	#include <asm/addrspace.h>
	#include <asm/page.h>

	#include <linux/linkage.h>
	#include <asm/cachectl.h>
	#include <asm/fixmap.h>

	#include <asm-generic/pgtable-nopmd.h>

	extern int temp_tlb_entry;

	/*
	* - add_temporary_entry() add a temporary TLB entry. We use TLB entries
	* starting at the top and working down. This is for populating the
	* TLB before trap_init() puts the TLB miss handler in place. It
	* should be used only for entries matching the actual page tables,
	* to prevent inconsistencies.
	*/
	extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
	unsigned long entryhi, unsigned long pagemask);

	/*
	* Basically we have the same two-level (which is the logical three level
	* Linux page table layout folded) page tables as the i386. Some day
	* when we have proper page coloring support we can have a 1% quicker
	* tlb refill handling mechanism, but for now it is a bit slower but
	* works even with the cache aliasing problem the R4k and above have.
	*/

	/* PGDIR_SHIFT determines what a third-level page table entry can map */
	#define PGDIR_SHIFT (2 * PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2)
	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
	#define PGDIR_MASK (~(PGDIR_SIZE-1))

	/*
	* Entries per page directory level: we use two-level, so
	* we don't really have any PUD/PMD directory physically.
	*/
	#define __PGD_ORDER (32 - 3 * PAGE_SHIFT + PGD_T_LOG2 + PTE_T_LOG2)
	#define PGD_ORDER (__PGD_ORDER >= 0 ? __PGD_ORDER : 0)
	#define PUD_ORDER aieeee_attempt_to_allocate_pud
	#define PMD_ORDER 1
	#define PTE_ORDER 0

	#define PTRS_PER_PGD (USER_PTRS_PER_PGD * 2)
	#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))

	#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
	#define FIRST_USER_ADDRESS 0UL

	#define VMALLOC_START MAP_BASE

	#define PKMAP_BASE (0xfe000000UL)

	#ifdef CONFIG_HIGHMEM
	# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
	#else
	# define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
	#endif

	#ifdef CONFIG_PHYS_ADDR_T_64BIT
	#define pte_ERROR(e) \
	printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
	#else
	#define pte_ERROR(e) \
	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
	#endif
	#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))

	extern void load_pgd(unsigned long pg_dir);

	extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];

	/*
	* Empty pgd/pmd entries point to the invalid_pte_table.
	*/
	static inline int pmd_none(pmd_t pmd)
	{
	return pmd_val(pmd) == (unsigned long) invalid_pte_table;
	}

	#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)

	static inline int pmd_present(pmd_t pmd)
	{
	return pmd_val(pmd) != (unsigned long) invalid_pte_table;
	}

	static inline void pmd_clear(pmd_t *pmdp)
	{
	pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
	}

	#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
	#define pte_page(x) pfn_to_page(pte_pfn(x))
	#define pte_pfn(x) (((unsigned long)((x).pte_high >> _PFN_SHIFT)) \| (unsigned long)((x).pte_low << _PAGE_PRESENT_SHIFT))
	static inline pte_t
	pfn_pte(unsigned long pfn, pgprot_t prot)
	{
	pte_t pte;

	pte.pte_low = (pfn >> _PAGE_PRESENT_SHIFT) \|
	(pgprot_val(prot) & ~_PFNX_MASK);
	pte.pte_high = (pfn << _PFN_SHIFT) \|
	(pgprot_val(prot) & ~_PFN_MASK);
	return pte;
	}

	#else

	#define pte_page(x) pfn_to_page(pte_pfn(x))

	#ifdef CONFIG_CPU_VR41XX
	#define pte_pfn(x) ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
	#define pfn_pte(pfn, prot) __pte(((pfn) << (PAGE_SHIFT + 2)) \| pgprot_val(prot))
	#else
	#define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT))
	#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << _PFN_SHIFT) \| pgprot_val(prot))
	#endif
	#endif /* defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) */

	#define __pgd_offset(address) pgd_index(address)
	#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
	#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))

	/* to find an entry in a kernel page-table-directory */
	#define pgd_offset_k(address) pgd_offset(&init_mm, address)

	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))

	/* to find an entry in a page-table-directory */
	#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))

	/* Find an entry in the third-level page table.. */
	#define __pte_offset(address) \
	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	#define pte_offset(dir, address) \
	((pte_t ) pmd_page_vaddr((dir)) + __pte_offset(address))
	#define pte_offset_kernel(dir, address) \
	((pte_t ) pmd_page_vaddr((dir)) + __pte_offset(address))

	#define pte_offset_map(dir, address) \
	((pte_t )page_address(pmd_page((dir))) + __pte_offset(address))
	#define pte_unmap(pte) ((void)(pte))

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

	/* Swap entries must have VALID bit cleared. */
	#define __swp_type(x) (((x).val >> 10) & 0x1f)
	#define __swp_offset(x) ((x).val >> 15)
	#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 10) \| ((offset) << 15) })
	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })

	#else

	#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)

	/* Swap entries must have VALID and GLOBAL bits cleared. */
	#define __swp_type(x) (((x).val >> 4) & 0x1f)
	#define __swp_offset(x) ((x).val >> 9)
	#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 4) \| ((offset) << 9) })
	#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high })
	#define __swp_entry_to_pte(x) ((pte_t) { 0, (x).val })

	#else
	/*
	* Constraints:
	* _PAGE_PRESENT at bit 0
	* _PAGE_MODIFIED at bit 4
	* _PAGE_GLOBAL at bit 6
	* _PAGE_VALID at bit 7
	*/
	#define __swp_type(x) (((x).val >> 8) & 0x1f)
	#define __swp_offset(x) ((x).val >> 13)
	#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 8) \| ((offset) << 13) })
	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })

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

	#endif /* defined(CONFIG_CPU_R3000) \|\| defined(CONFIG_CPU_TX39XX) */

	#endif /* _ASM_PGTABLE_32_H */