arch/powerpc/include/asm/page.h - linux - Git at Google

 #ifndef _ASM_POWERPC_PAGE_H
 #define _ASM_POWERPC_PAGE_H

 /*
  * Copyright (C) 2001,2005 IBM Corporation.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */

 #ifndef __ASSEMBLY__
 #include <linux/types.h>
 #else
 #include <asm/types.h>
 #endif
 #include <asm/asm-compat.h>
 #include <asm/kdump.h>

 /*
  * On regular PPC32 page size is 4K (but we support 4K/16K/64K pages
  * on PPC44x). For PPC64 we support either 4K or 64K software
  * page size. When using 64K pages however, whether we are really supporting
  * 64K pages in HW or not is irrelevant to those definitions.
  */
 #if defined(CONFIG_PPC_64K_PAGES)
 #define PAGE_SHIFT		16
 #elif defined(CONFIG_PPC_16K_PAGES)
 #define PAGE_SHIFT		14
 #else
 #define PAGE_SHIFT		12
 #endif

 #define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)

 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
 #define __HAVE_ARCH_GATE_AREA		1

 /*
  * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
  * assign PAGE_MASK to a larger type it gets extended the way we want
  * (i.e. with 1s in the high bits)
  */
 #define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))

 /*
  * KERNELBASE is the virtual address of the start of the kernel, it's often
  * the same as PAGE_OFFSET, but _might not be_.
  *
  * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
  *
  * PAGE_OFFSET is the virtual address of the start of lowmem.
  *
  * PHYSICAL_START is the physical address of the start of the kernel.
  *
  * MEMORY_START is the physical address of the start of lowmem.
  *
  * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
  * ppc32 and based on how they are set we determine MEMORY_START.
  *
  * For the linear mapping the following equation should be true:
  * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
  *
  * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
  *
  * There are two was to determine a physical address from a virtual one:
  * va = pa + PAGE_OFFSET - MEMORY_START
  * va = pa + KERNELBASE - PHYSICAL_START
  *
  * If you want to know something's offset from the start of the kernel you
  * should subtract KERNELBASE.
  *
  * If you want to test if something's a kernel address, use is_kernel_addr().
  */

 #define KERNELBASE      ASM_CONST(CONFIG_KERNEL_START)
 #define PAGE_OFFSET	ASM_CONST(CONFIG_PAGE_OFFSET)
 #define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))

 #if defined(CONFIG_RELOCATABLE)
 #ifndef __ASSEMBLY__

 extern phys_addr_t memstart_addr;
 extern phys_addr_t kernstart_addr;
 #endif
 #define PHYSICAL_START	kernstart_addr
 #else
 #define PHYSICAL_START	ASM_CONST(CONFIG_PHYSICAL_START)
 #endif

 #ifdef CONFIG_PPC64
 #define MEMORY_START	0UL
 #elif defined(CONFIG_RELOCATABLE)
 #define MEMORY_START	memstart_addr
 #else
 #define MEMORY_START	(PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
 #endif

 #ifdef CONFIG_FLATMEM
 #define ARCH_PFN_OFFSET		(MEMORY_START >> PAGE_SHIFT)
 #define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
 #endif

 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
 #define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START))
 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)

 /*
  * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
  * and needs to be executable.  This means the whole heap ends
  * up being executable.
  */
 #define VM_DATA_DEFAULT_FLAGS32	(VM_READ | VM_WRITE | VM_EXEC | \
 				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

 #define VM_DATA_DEFAULT_FLAGS64	(VM_READ | VM_WRITE | \
 				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

 #ifdef __powerpc64__
 #include <asm/page_64.h>
 #else
 #include <asm/page_32.h>
 #endif

 /* align addr on a size boundary - adjust address up/down if needed */
 #define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
 #define _ALIGN_DOWN(addr,size)	((addr)&(~((size)-1)))

 /* align addr on a size boundary - adjust address up if needed */
 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)

 /*
  * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
  * "kernelness", use is_kernel_addr() - it should do what you want.
  */
 #define is_kernel_addr(x)	((x) >= PAGE_OFFSET)

 #ifndef __ASSEMBLY__

 #undef STRICT_MM_TYPECHECKS

 #ifdef STRICT_MM_TYPECHECKS
 /* These are used to make use of C type-checking. */

 /* PTE level */
 typedef struct { pte_basic_t pte; } pte_t;
 #define pte_val(x)	((x).pte)
 #define __pte(x)	((pte_t) { (x) })

 /* 64k pages additionally define a bigger "real PTE" type that gathers
  * the "second half" part of the PTE for pseudo 64k pages
  */
 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
 #else
 typedef struct { pte_t pte; } real_pte_t;
 #endif

 /* PMD level */
 #ifdef CONFIG_PPC64
 typedef struct { unsigned long pmd; } pmd_t;
 #define pmd_val(x)	((x).pmd)
 #define __pmd(x)	((pmd_t) { (x) })

 /* PUD level exusts only on 4k pages */
 #ifndef CONFIG_PPC_64K_PAGES
 typedef struct { unsigned long pud; } pud_t;
 #define pud_val(x)	((x).pud)
 #define __pud(x)	((pud_t) { (x) })
 #endif /* !CONFIG_PPC_64K_PAGES */
 #endif /* CONFIG_PPC64 */

 /* PGD level */
 typedef struct { unsigned long pgd; } pgd_t;
 #define pgd_val(x)	((x).pgd)
 #define __pgd(x)	((pgd_t) { (x) })

 /* Page protection bits */
 typedef struct { unsigned long pgprot; } pgprot_t;
 #define pgprot_val(x)	((x).pgprot)
 #define __pgprot(x)	((pgprot_t) { (x) })

 #else

 /*
  * .. while these make it easier on the compiler
  */

 typedef pte_basic_t pte_t;
 #define pte_val(x)	(x)
 #define __pte(x)	(x)

 #if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
 #else
 typedef pte_t real_pte_t;
 #endif


 #ifdef CONFIG_PPC64
 typedef unsigned long pmd_t;
 #define pmd_val(x)	(x)
 #define __pmd(x)	(x)

 #ifndef CONFIG_PPC_64K_PAGES
 typedef unsigned long pud_t;
 #define pud_val(x)	(x)
 #define __pud(x)	(x)
 #endif /* !CONFIG_PPC_64K_PAGES */
 #endif /* CONFIG_PPC64 */

 typedef unsigned long pgd_t;
 #define pgd_val(x)	(x)
 #define pgprot_val(x)	(x)

 typedef unsigned long pgprot_t;
 #define __pgd(x)	(x)
 #define __pgprot(x)	(x)

 #endif

 struct page;
 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
 		struct page *p);
 extern int page_is_ram(unsigned long pfn);

 struct vm_area_struct;

 typedef struct page *pgtable_t;

 #include <asm-generic/memory_model.h>
 #endif /* __ASSEMBLY__ */

 #endif /* _ASM_POWERPC_PAGE_H */
	#ifndef _ASM_POWERPC_PAGE_H
	#define _ASM_POWERPC_PAGE_H

	/*
	* Copyright (C) 2001,2005 IBM Corporation.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#ifndef __ASSEMBLY__
	#include <linux/types.h>
	#else
	#include <asm/types.h>
	#endif
	#include <asm/asm-compat.h>
	#include <asm/kdump.h>

	/*
	* On regular PPC32 page size is 4K (but we support 4K/16K/64K pages
	* on PPC44x). For PPC64 we support either 4K or 64K software
	* page size. When using 64K pages however, whether we are really supporting
	* 64K pages in HW or not is irrelevant to those definitions.
	*/
	#if defined(CONFIG_PPC_64K_PAGES)
	#define PAGE_SHIFT 16
	#elif defined(CONFIG_PPC_16K_PAGES)
	#define PAGE_SHIFT 14
	#else
	#define PAGE_SHIFT 12
	#endif

	#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)

	/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
	#define __HAVE_ARCH_GATE_AREA 1

	/*
	* Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
	* assign PAGE_MASK to a larger type it gets extended the way we want
	* (i.e. with 1s in the high bits)
	*/
	#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))

	/*
	* KERNELBASE is the virtual address of the start of the kernel, it's often
	* the same as PAGE_OFFSET, but _might not be_.
	*
	* The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
	*
	* PAGE_OFFSET is the virtual address of the start of lowmem.
	*
	* PHYSICAL_START is the physical address of the start of the kernel.
	*
	* MEMORY_START is the physical address of the start of lowmem.
	*
	* KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
	* ppc32 and based on how they are set we determine MEMORY_START.
	*
	* For the linear mapping the following equation should be true:
	* KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
	*
	* Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
	*
	* There are two was to determine a physical address from a virtual one:
	* va = pa + PAGE_OFFSET - MEMORY_START
	* va = pa + KERNELBASE - PHYSICAL_START
	*
	* If you want to know something's offset from the start of the kernel you
	* should subtract KERNELBASE.
	*
	* If you want to test if something's a kernel address, use is_kernel_addr().
	*/

	#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
	#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
	#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))

	#if defined(CONFIG_RELOCATABLE)
	#ifndef __ASSEMBLY__

	extern phys_addr_t memstart_addr;
	extern phys_addr_t kernstart_addr;
	#endif
	#define PHYSICAL_START kernstart_addr
	#else
	#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
	#endif

	#ifdef CONFIG_PPC64
	#define MEMORY_START 0UL
	#elif defined(CONFIG_RELOCATABLE)
	#define MEMORY_START memstart_addr
	#else
	#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
	#endif

	#ifdef CONFIG_FLATMEM
	#define ARCH_PFN_OFFSET (MEMORY_START >> PAGE_SHIFT)
	#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
	#endif

	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

	#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START))
	#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)

	/*
	* Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
	* and needs to be executable. This means the whole heap ends
	* up being executable.
	*/
	#define VM_DATA_DEFAULT_FLAGS32 (VM_READ \| VM_WRITE \| VM_EXEC \| \
	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)

	#define VM_DATA_DEFAULT_FLAGS64 (VM_READ \| VM_WRITE \| \
	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)

	#ifdef __powerpc64__
	#include <asm/page_64.h>
	#else
	#include <asm/page_32.h>
	#endif

	/* align addr on a size boundary - adjust address up/down if needed */
	#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
	#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))

	/* align addr on a size boundary - adjust address up if needed */
	#define _ALIGN(addr,size) _ALIGN_UP(addr,size)

	/*
	* Don't compare things with KERNELBASE or PAGE_OFFSET to test for
	* "kernelness", use is_kernel_addr() - it should do what you want.
	*/
	#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)

	#ifndef __ASSEMBLY__

	#undef STRICT_MM_TYPECHECKS

	#ifdef STRICT_MM_TYPECHECKS
	/* These are used to make use of C type-checking. */

	/* PTE level */
	typedef struct { pte_basic_t pte; } pte_t;
	#define pte_val(x) ((x).pte)
	#define __pte(x) ((pte_t) { (x) })

	/* 64k pages additionally define a bigger "real PTE" type that gathers
	* the "second half" part of the PTE for pseudo 64k pages
	*/
	#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
	typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
	#else
	typedef struct { pte_t pte; } real_pte_t;
	#endif

	/* PMD level */
	#ifdef CONFIG_PPC64
	typedef struct { unsigned long pmd; } pmd_t;
	#define pmd_val(x) ((x).pmd)
	#define __pmd(x) ((pmd_t) { (x) })

	/* PUD level exusts only on 4k pages */
	#ifndef CONFIG_PPC_64K_PAGES
	typedef struct { unsigned long pud; } pud_t;
	#define pud_val(x) ((x).pud)
	#define __pud(x) ((pud_t) { (x) })
	#endif /* !CONFIG_PPC_64K_PAGES */
	#endif /* CONFIG_PPC64 */

	/* PGD level */
	typedef struct { unsigned long pgd; } pgd_t;
	#define pgd_val(x) ((x).pgd)
	#define __pgd(x) ((pgd_t) { (x) })

	/* Page protection bits */
	typedef struct { unsigned long pgprot; } pgprot_t;
	#define pgprot_val(x) ((x).pgprot)
	#define __pgprot(x) ((pgprot_t) { (x) })

	#else

	/*
	* .. while these make it easier on the compiler
	*/

	typedef pte_basic_t pte_t;
	#define pte_val(x) (x)
	#define __pte(x) (x)

	#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC_STD_MMU_64)
	typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
	#else
	typedef pte_t real_pte_t;
	#endif


	#ifdef CONFIG_PPC64
	typedef unsigned long pmd_t;
	#define pmd_val(x) (x)
	#define __pmd(x) (x)

	#ifndef CONFIG_PPC_64K_PAGES
	typedef unsigned long pud_t;
	#define pud_val(x) (x)
	#define __pud(x) (x)
	#endif /* !CONFIG_PPC_64K_PAGES */
	#endif /* CONFIG_PPC64 */

	typedef unsigned long pgd_t;
	#define pgd_val(x) (x)
	#define pgprot_val(x) (x)

	typedef unsigned long pgprot_t;
	#define __pgd(x) (x)
	#define __pgprot(x) (x)

	#endif

	struct page;
	extern void clear_user_page(void page, unsigned long vaddr, struct page pg);
	extern void copy_user_page(void to, void from, unsigned long vaddr,
	struct page *p);
	extern int page_is_ram(unsigned long pfn);

	struct vm_area_struct;

	typedef struct page *pgtable_t;

	#include <asm-generic/memory_model.h>
	#endif /* __ASSEMBLY__ */

	#endif /* _ASM_POWERPC_PAGE_H */