arch/arm/include/asm/memory.h - kernel/skids - Git at Google

 /*
  *  arch/arm/include/asm/memory.h
  *
  *  Copyright (C) 2000-2002 Russell King
  *  modification for nommu, Hyok S. Choi, 2004
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  *  Note: this file should not be included by non-asm/.h files
  */
 #ifndef __ASM_ARM_MEMORY_H
 #define __ASM_ARM_MEMORY_H

 #include <linux/compiler.h>
 #include <linux/const.h>
 #include <mach/memory.h>
 #include <asm/sizes.h>

 /*
  * Allow for constants defined here to be used from assembly code
  * by prepending the UL suffix only with actual C code compilation.
  */
 #define UL(x) _AC(x, UL)

 #ifdef CONFIG_MMU

 /*
  * PAGE_OFFSET - the virtual address of the start of the kernel image
  * TASK_SIZE - the maximum size of a user space task.
  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  */
 #define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
 #define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
 #define TASK_UNMAPPED_BASE	(UL(CONFIG_PAGE_OFFSET) / 3)

 /*
  * The maximum size of a 26-bit user space task.
  */
 #define TASK_SIZE_26		UL(0x04000000)

 /*
  * The module space lives between the addresses given by TASK_SIZE
  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  */
 #ifndef CONFIG_THUMB2_KERNEL
 #define MODULES_VADDR		(PAGE_OFFSET - 16*1024*1024)
 #else
 /* smaller range for Thumb-2 symbols relocation (2^24)*/
 #define MODULES_VADDR		(PAGE_OFFSET - 8*1024*1024)
 #endif

 #if TASK_SIZE > MODULES_VADDR
 #error Top of user space clashes with start of module space
 #endif

 /*
  * The highmem pkmap virtual space shares the end of the module area.
  */
 #ifdef CONFIG_HIGHMEM
 #define MODULES_END		(PAGE_OFFSET - PMD_SIZE)
 #else
 #define MODULES_END		(PAGE_OFFSET)
 #endif

 /*
  * The XIP kernel gets mapped at the bottom of the module vm area.
  * Since we use sections to map it, this macro replaces the physical address
  * with its virtual address while keeping offset from the base section.
  */
 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))

 /*
  * Allow 16MB-aligned ioremap pages
  */
 #define IOREMAP_MAX_ORDER	24

 /*
  * Size of DMA-consistent memory region.  Must be multiple of 2M,
  * between 2MB and 14MB inclusive.
  */
 #ifndef CONSISTENT_DMA_SIZE
 #define CONSISTENT_DMA_SIZE 	SZ_2M
 #endif

 #define CONSISTENT_END		(0xffe00000UL)
 #define CONSISTENT_BASE		(CONSISTENT_END - CONSISTENT_DMA_SIZE)

 #else /* CONFIG_MMU */

 /*
  * The limitation of user task size can grow up to the end of free ram region.
  * It is difficult to define and perhaps will never meet the original meaning
  * of this define that was meant to.
  * Fortunately, there is no reference for this in noMMU mode, for now.
  */
 #ifndef TASK_SIZE
 #define TASK_SIZE		(CONFIG_DRAM_SIZE)
 #endif

 #ifndef TASK_UNMAPPED_BASE
 #define TASK_UNMAPPED_BASE	UL(0x00000000)
 #endif

 #ifndef PHYS_OFFSET
 #define PHYS_OFFSET 		UL(CONFIG_DRAM_BASE)
 #endif

 #ifndef END_MEM
 #define END_MEM     		(UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
 #endif

 #ifndef PAGE_OFFSET
 #define PAGE_OFFSET		(PHYS_OFFSET)
 #endif

 /*
  * The module can be at any place in ram in nommu mode.
  */
 #define MODULES_END		(END_MEM)
 #define MODULES_VADDR		(PHYS_OFFSET)

 #endif /* !CONFIG_MMU */

 /*
  * Physical vs virtual RAM address space conversion.  These are
  * private definitions which should NOT be used outside memory.h
  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  */
 #ifndef __virt_to_phys
 #define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
 #define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
 #endif

 /*
  * Convert a physical address to a Page Frame Number and back
  */
 #define	__phys_to_pfn(paddr)	((paddr) >> PAGE_SHIFT)
 #define	__pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)

 /*
  * Convert a page to/from a physical address
  */
 #define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
 #define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))

 #ifndef __ASSEMBLY__

 /*
  * The DMA mask corresponding to the maximum bus address allocatable
  * using GFP_DMA.  The default here places no restriction on DMA
  * allocations.  This must be the smallest DMA mask in the system,
  * so a successful GFP_DMA allocation will always satisfy this.
  */
 #ifndef ISA_DMA_THRESHOLD
 #define ISA_DMA_THRESHOLD	(0xffffffffULL)
 #endif

 #ifndef arch_adjust_zones
 #define arch_adjust_zones(node,size,holes) do { } while (0)
 #elif !defined(CONFIG_ZONE_DMA)
 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
 #endif

 /*
  * PFNs are used to describe any physical page; this means
  * PFN 0 == physical address 0.
  *
  * This is the PFN of the first RAM page in the kernel
  * direct-mapped view.  We assume this is the first page
  * of RAM in the mem_map as well.
  */
 #define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)

 /*
  * These are *only* valid on the kernel direct mapped RAM memory.
  * Note: Drivers should NOT use these.  They are the wrong
  * translation for translating DMA addresses.  Use the driver
  * DMA support - see dma-mapping.h.
  */
 static inline unsigned long virt_to_phys(void *x)
 {
 	return __virt_to_phys((unsigned long)(x));
 }

 static inline void *phys_to_virt(unsigned long x)
 {
 	return (void *)(__phys_to_virt((unsigned long)(x)));
 }

 /*
  * Drivers should NOT use these either.
  */
 #define __pa(x)			__virt_to_phys((unsigned long)(x))
 #define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

 /*
  * Virtual <-> DMA view memory address translations
  * Again, these are *only* valid on the kernel direct mapped RAM
  * memory.  Use of these is *deprecated* (and that doesn't mean
  * use the __ prefixed forms instead.)  See dma-mapping.h.
  */
 #ifndef __virt_to_bus
 #define __virt_to_bus	__virt_to_phys
 #define __bus_to_virt	__phys_to_virt
 #define __pfn_to_bus(x)	__pfn_to_phys(x)
 #define __bus_to_pfn(x)	__phys_to_pfn(x)
 #endif

 static inline __deprecated unsigned long virt_to_bus(void *x)
 {
 	return __virt_to_bus((unsigned long)x);
 }

 static inline __deprecated void *bus_to_virt(unsigned long x)
 {
 	return (void *)__bus_to_virt(x);
 }

 /*
  * Conversion between a struct page and a physical address.
  *
  * Note: when converting an unknown physical address to a
  * struct page, the resulting pointer must be validated
  * using VALID_PAGE().  It must return an invalid struct page
  * for any physical address not corresponding to a system
  * RAM address.
  *
  *  page_to_pfn(page)	convert a struct page * to a PFN number
  *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
  *
  *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
  *  virt_addr_valid(k)	indicates whether a virtual address is valid
  */
 #ifndef CONFIG_DISCONTIGMEM

 #define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET

 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)

 #define PHYS_TO_NID(addr)	(0)

 #else /* CONFIG_DISCONTIGMEM */

 /*
  * This is more complex.  We have a set of mem_map arrays spread
  * around in memory.
  */
 #include <linux/numa.h>

 #define arch_pfn_to_nid(pfn)	PFN_TO_NID(pfn)
 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)

 #define virt_to_page(kaddr)					\
 	(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))

 #define virt_addr_valid(kaddr)	(KVADDR_TO_NID(kaddr) < MAX_NUMNODES)

 /*
  * Common discontigmem stuff.
  *  PHYS_TO_NID is used by the ARM kernel/setup.c
  */
 #define PHYS_TO_NID(addr)	PFN_TO_NID((addr) >> PAGE_SHIFT)

 /*
  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  * and returns the mem_map of that node.
  */
 #define ADDR_TO_MAPBASE(kaddr)	NODE_MEM_MAP(KVADDR_TO_NID(kaddr))

 /*
  * Given a page frame number, find the owning node of the memory
  * and returns the mem_map of that node.
  */
 #define PFN_TO_MAPBASE(pfn)	NODE_MEM_MAP(PFN_TO_NID(pfn))

 #ifdef NODE_MEM_SIZE_BITS
 #define NODE_MEM_SIZE_MASK	((1 << NODE_MEM_SIZE_BITS) - 1)

 /*
  * Given a kernel address, find the home node of the underlying memory.
  */
 #define KVADDR_TO_NID(addr) \
 	(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)

 /*
  * Given a page frame number, convert it to a node id.
  */
 #define PFN_TO_NID(pfn) \
 	(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))

 /*
  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  * and returns the index corresponding to the appropriate page in the
  * node's mem_map.
  */
 #define LOCAL_MAP_NR(addr) \
 	(((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)

 #endif /* NODE_MEM_SIZE_BITS */

 #endif /* !CONFIG_DISCONTIGMEM */

 /*
  * Optional coherency support.  Currently used only by selected
  * Intel XSC3-based systems.
  */
 #ifndef arch_is_coherent
 #define arch_is_coherent()		0
 #endif

 #endif

 #include <asm-generic/memory_model.h>

 #endif
	/*
	* arch/arm/include/asm/memory.h
	*
	* Copyright (C) 2000-2002 Russell King
	* modification for nommu, Hyok S. Choi, 2004
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* Note: this file should not be included by non-asm/.h files
	*/
	#ifndef __ASM_ARM_MEMORY_H
	#define __ASM_ARM_MEMORY_H

	#include <linux/compiler.h>
	#include <linux/const.h>
	#include <mach/memory.h>
	#include <asm/sizes.h>

	/*
	* Allow for constants defined here to be used from assembly code
	* by prepending the UL suffix only with actual C code compilation.
	*/
	#define UL(x) _AC(x, UL)

	#ifdef CONFIG_MMU

	/*
	* PAGE_OFFSET - the virtual address of the start of the kernel image
	* TASK_SIZE - the maximum size of a user space task.
	* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
	*/
	#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
	#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
	#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)

	/*
	* The maximum size of a 26-bit user space task.
	*/
	#define TASK_SIZE_26 UL(0x04000000)

	/*
	* The module space lives between the addresses given by TASK_SIZE
	* and PAGE_OFFSET - it must be within 32MB of the kernel text.
	*/
	#ifndef CONFIG_THUMB2_KERNEL
	#define MODULES_VADDR (PAGE_OFFSET - 1610241024)
	#else
	/* smaller range for Thumb-2 symbols relocation (2^24)*/
	#define MODULES_VADDR (PAGE_OFFSET - 810241024)
	#endif

	#if TASK_SIZE > MODULES_VADDR
	#error Top of user space clashes with start of module space
	#endif

	/*
	* The highmem pkmap virtual space shares the end of the module area.
	*/
	#ifdef CONFIG_HIGHMEM
	#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
	#else
	#define MODULES_END (PAGE_OFFSET)
	#endif

	/*
	* The XIP kernel gets mapped at the bottom of the module vm area.
	* Since we use sections to map it, this macro replaces the physical address
	* with its virtual address while keeping offset from the base section.
	*/
	#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))

	/*
	* Allow 16MB-aligned ioremap pages
	*/
	#define IOREMAP_MAX_ORDER 24

	/*
	* Size of DMA-consistent memory region. Must be multiple of 2M,
	* between 2MB and 14MB inclusive.
	*/
	#ifndef CONSISTENT_DMA_SIZE
	#define CONSISTENT_DMA_SIZE SZ_2M
	#endif

	#define CONSISTENT_END (0xffe00000UL)
	#define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE)

	#else /* CONFIG_MMU */

	/*
	* The limitation of user task size can grow up to the end of free ram region.
	* It is difficult to define and perhaps will never meet the original meaning
	* of this define that was meant to.
	* Fortunately, there is no reference for this in noMMU mode, for now.
	*/
	#ifndef TASK_SIZE
	#define TASK_SIZE (CONFIG_DRAM_SIZE)
	#endif

	#ifndef TASK_UNMAPPED_BASE
	#define TASK_UNMAPPED_BASE UL(0x00000000)
	#endif

	#ifndef PHYS_OFFSET
	#define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
	#endif

	#ifndef END_MEM
	#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
	#endif

	#ifndef PAGE_OFFSET
	#define PAGE_OFFSET (PHYS_OFFSET)
	#endif

	/*
	* The module can be at any place in ram in nommu mode.
	*/
	#define MODULES_END (END_MEM)
	#define MODULES_VADDR (PHYS_OFFSET)

	#endif /* !CONFIG_MMU */

	/*
	* Physical vs virtual RAM address space conversion. These are
	* private definitions which should NOT be used outside memory.h
	* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
	*/
	#ifndef __virt_to_phys
	#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
	#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
	#endif

	/*
	* Convert a physical address to a Page Frame Number and back
	*/
	#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
	#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)

	/*
	* Convert a page to/from a physical address
	*/
	#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
	#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))

	#ifndef __ASSEMBLY__

	/*
	* The DMA mask corresponding to the maximum bus address allocatable
	* using GFP_DMA. The default here places no restriction on DMA
	* allocations. This must be the smallest DMA mask in the system,
	* so a successful GFP_DMA allocation will always satisfy this.
	*/
	#ifndef ISA_DMA_THRESHOLD
	#define ISA_DMA_THRESHOLD (0xffffffffULL)
	#endif

	#ifndef arch_adjust_zones
	#define arch_adjust_zones(node,size,holes) do { } while (0)
	#elif !defined(CONFIG_ZONE_DMA)
	#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
	#endif

	/*
	* PFNs are used to describe any physical page; this means
	* PFN 0 == physical address 0.
	*
	* This is the PFN of the first RAM page in the kernel
	* direct-mapped view. We assume this is the first page
	* of RAM in the mem_map as well.
	*/
	#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)

	/*
	* These are only valid on the kernel direct mapped RAM memory.
	* Note: Drivers should NOT use these. They are the wrong
	* translation for translating DMA addresses. Use the driver
	* DMA support - see dma-mapping.h.
	*/
	static inline unsigned long virt_to_phys(void *x)
	{
	return __virt_to_phys((unsigned long)(x));
	}

	static inline void *phys_to_virt(unsigned long x)
	{
	return (void *)(__phys_to_virt((unsigned long)(x)));
	}

	/*
	* Drivers should NOT use these either.
	*/
	#define __pa(x) __virt_to_phys((unsigned long)(x))
	#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)

	/*
	* Virtual <-> DMA view memory address translations
	* Again, these are only valid on the kernel direct mapped RAM
	* memory. Use of these is deprecated (and that doesn't mean
	* use the __ prefixed forms instead.) See dma-mapping.h.
	*/
	#ifndef __virt_to_bus
	#define __virt_to_bus __virt_to_phys
	#define __bus_to_virt __phys_to_virt
	#define __pfn_to_bus(x) __pfn_to_phys(x)
	#define __bus_to_pfn(x) __phys_to_pfn(x)
	#endif

	static inline __deprecated unsigned long virt_to_bus(void *x)
	{
	return __virt_to_bus((unsigned long)x);
	}

	static inline __deprecated void *bus_to_virt(unsigned long x)
	{
	return (void *)__bus_to_virt(x);
	}

	/*
	* Conversion between a struct page and a physical address.
	*
	* Note: when converting an unknown physical address to a
	* struct page, the resulting pointer must be validated
	* using VALID_PAGE(). It must return an invalid struct page
	* for any physical address not corresponding to a system
	* RAM address.
	*
	* page_to_pfn(page) convert a struct page * to a PFN number
	* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
	*
	* virt_to_page(k) convert a _valid_ virtual address to struct page *
	* virt_addr_valid(k) indicates whether a virtual address is valid
	*/
	#ifndef CONFIG_DISCONTIGMEM

	#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET

	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)

	#define PHYS_TO_NID(addr) (0)

	#else /* CONFIG_DISCONTIGMEM */

	/*
	* This is more complex. We have a set of mem_map arrays spread
	* around in memory.
	*/
	#include <linux/numa.h>

	#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
	#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)

	#define virt_to_page(kaddr) \
	(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))

	#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)

	/*
	* Common discontigmem stuff.
	* PHYS_TO_NID is used by the ARM kernel/setup.c
	*/
	#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)

	/*
	* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
	* and returns the mem_map of that node.
	*/
	#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))

	/*
	* Given a page frame number, find the owning node of the memory
	* and returns the mem_map of that node.
	*/
	#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))

	#ifdef NODE_MEM_SIZE_BITS
	#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)

	/*
	* Given a kernel address, find the home node of the underlying memory.
	*/
	#define KVADDR_TO_NID(addr) \
	(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)

	/*
	* Given a page frame number, convert it to a node id.
	*/
	#define PFN_TO_NID(pfn) \
	(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))

	/*
	* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
	* and returns the index corresponding to the appropriate page in the
	* node's mem_map.
	*/
	#define LOCAL_MAP_NR(addr) \
	(((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)

	#endif /* NODE_MEM_SIZE_BITS */

	#endif /* !CONFIG_DISCONTIGMEM */

	/*
	* Optional coherency support. Currently used only by selected
	* Intel XSC3-based systems.
	*/
	#ifndef arch_is_coherent
	#define arch_is_coherent() 0
	#endif

	#endif

	#include <asm-generic/memory_model.h>

	#endif