/* *  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 <linux/types.h>#include <asm/sizes.h> #ifdef CONFIG_NEED_MACH_MEMORY_H#include <mach/memory.h>#endif /* * 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 #define CONSISTENT_END		(0xffe00000UL) #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) #define XIP_VIRT_ADDR(physaddr)  (physaddr) #endif /* !CONFIG_MMU */ /* * We fix the TCM memories max 32 KiB ITCM resp DTCM at these * locations */#ifdef CONFIG_HAVE_TCM#define ITCM_OFFSET	UL(0xfffe0000)#define DTCM_OFFSET	UL(0xfffe8000)#endif /* * Convert a physical address to a Page Frame Number and back */#define	__phys_to_pfn(paddr)	((unsigned long)((paddr) >> PAGE_SHIFT))#define	__pfn_to_phys(pfn)	((phys_addr_t)(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__ /* * 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#ifdef CONFIG_ARM_PATCH_PHYS_VIRT /* * Constants used to force the right instruction encodings and shifts * so that all we need to do is modify the 8-bit constant field. */#define __PV_BITS_31_24	0x81000000 extern unsigned long __pv_phys_offset;#define PHYS_OFFSET __pv_phys_offset #define __pv_stub(from,to,instr,type)			\	__asm__("@ __pv_stub\n"				\	"1:	" instr "	%0, %1, %2\n"		\	"	.pushsection .pv_table,\"a\"\n"		\	"	.long	1b\n"				\	"	.popsection\n"				\	: "=r" (to)					\	: "r" (from), "I" (type)) static inline unsigned long __virt_to_phys(unsigned long x){	unsigned long t;	__pv_stub(x, t, "add", __PV_BITS_31_24);	return t;} static inline unsigned long __phys_to_virt(unsigned long x){	unsigned long t;	__pv_stub(x, t, "sub", __PV_BITS_31_24);	return t;}#else#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)#endif#endif #ifndef PHYS_OFFSET#ifdef PLAT_PHYS_OFFSET#define PHYS_OFFSET	PLAT_PHYS_OFFSET#else#define PHYS_OFFSET	UL(CONFIG_PHYS_OFFSET)#endif#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 phys_addr_t virt_to_phys(const volatile void *x){	return __virt_to_phys((unsigned long)(x));} static inline void *phys_to_virt(phys_addr_t 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 */#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) /* * 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