/* *  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 <linux/sizes.h> #include <asm/cache.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(SZ_16M))#define TASK_UNMAPPED_BASE	ALIGN(TASK_SIZE / 3, SZ_16M) /* * The maximum size of a 26-bit user space task. */#define TASK_SIZE_26		(UL(1) << 26) /* * 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 - SZ_16M)#else/* smaller range for Thumb-2 symbols relocation (2^24)*/#define MODULES_VADDR		(PAGE_OFFSET - SZ_8M)#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 END_MEM#define END_MEM     		(UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)#endif #ifndef PAGE_OFFSET#define PAGE_OFFSET		PLAT_PHYS_OFFSET#endif /* * The module can be at any place in ram in nommu mode. */#define MODULES_END		(END_MEM)#define MODULES_VADDR		PAGE_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))) /* * Minimum guaranted alignment in pgd_alloc().  The page table pointers passed * around in head.S and proc-*.S are shifted by this amount, in order to * leave spare high bits for systems with physical address extension.  This * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but * gives us about 38-bits or so. */#ifdef CONFIG_ARM_LPAE#define ARCH_PGD_SHIFT		L1_CACHE_SHIFT#else#define ARCH_PGD_SHIFT		0#endif#define ARCH_PGD_MASK		((1 << ARCH_PGD_SHIFT) - 1) /* * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical * memory.  This is used for XIP and NoMMU kernels, or by kernels which * have their own mach/memory.h.  Assembly code must always use * PLAT_PHYS_OFFSET and not PHYS_OFFSET. */#ifndef PLAT_PHYS_OFFSET#define PLAT_PHYS_OFFSET	UL(CONFIG_PHYS_OFFSET)#endif #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#define __PV_BITS_7_0	0x81 extern u64 __pv_phys_offset;extern u64 __pv_offset;extern void fixup_pv_table(const void *, unsigned long);extern const void *__pv_table_begin, *__pv_table_end; #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)) #define __pv_stub_mov_hi(t)				\	__asm__ volatile("@ __pv_stub_mov\n"		\	"1:	mov	%R0, %1\n"			\	"	.pushsection .pv_table,\"a\"\n"		\	"	.long	1b\n"				\	"	.popsection\n"				\	: "=r" (t)					\	: "I" (__PV_BITS_7_0)) #define __pv_add_carry_stub(x, y)			\	__asm__ volatile("@ __pv_add_carry_stub\n"	\	"1:	adds	%Q0, %1, %2\n"			\	"	adc	%R0, %R0, #0\n"			\	"	.pushsection .pv_table,\"a\"\n"		\	"	.long	1b\n"				\	"	.popsection\n"				\	: "+r" (y)					\	: "r" (x), "I" (__PV_BITS_31_24)		\	: "cc") static inline phys_addr_t __virt_to_phys(unsigned long x){	phys_addr_t t; 	if (sizeof(phys_addr_t) == 4) {		__pv_stub(x, t, "add", __PV_BITS_31_24);	} else {		__pv_stub_mov_hi(t);		__pv_add_carry_stub(x, t);	}	return t;} static inline unsigned long __phys_to_virt(phys_addr_t x){	unsigned long t; 	/*	 * 'unsigned long' cast discard upper word when	 * phys_addr_t is 64 bit, and makes sure that inline	 * assembler expression receives 32 bit argument	 * in place where 'r' 32 bit operand is expected.	 */	__pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);	return t;} #else #define PHYS_OFFSET	PLAT_PHYS_OFFSET static inline phys_addr_t __virt_to_phys(unsigned long x){	return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;} static inline unsigned long __phys_to_virt(phys_addr_t x){	return x - PHYS_OFFSET + PAGE_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	((unsigned long)(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(x);} /* * Drivers should NOT use these either. */#define __pa(x)			__virt_to_phys((unsigned long)(x))#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT) extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); /* * These are for systems that have a hardware interconnect supported alias of * physical memory for idmap purposes.  Most cases should leave these * untouched. */static inline phys_addr_t __virt_to_idmap(unsigned long x){	if (arch_virt_to_idmap)		return arch_virt_to_idmap(x);	else		return __virt_to_phys(x);} #define virt_to_idmap(x)	__virt_to_idmap((unsigned long)(x)) /* * 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 #ifdef CONFIG_VIRT_TO_BUSstatic 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);}#endif /* * Conversion between a struct page and a physical 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) \					&& pfn_valid(__pa(kaddr) >> PAGE_SHIFT) ) #endif #include <asm-generic/memory_model.h> #endif