/* *  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> #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) /* PAGE_OFFSET - the virtual address of the start of the kernel image */#define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET) #ifdef CONFIG_MMU /* * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area */#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)) #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)/* * Allow 16MB-aligned ioremap pages */#define IOREMAP_MAX_ORDER	24#endif #define VECTORS_BASE		UL(0xffff0000) #else /* CONFIG_MMU */ #ifndef __ASSEMBLY__extern unsigned long vectors_base;#define VECTORS_BASE		vectors_base#endif /* * 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. */#define TASK_SIZE		UL(0xffffffff) #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 /* * 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 */ #ifdef CONFIG_XIP_KERNEL#define KERNEL_START		_sdata#else#define KERNEL_START		_stext#endif#define KERNEL_END		_end /* * 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 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))) /* * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical * memory.  This is used for XIP and NoMMU kernels, and on platforms that don't * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use * PLAT_PHYS_OFFSET and not PHYS_OFFSET. */#define PLAT_PHYS_OFFSET	UL(CONFIG_PHYS_OFFSET) #ifdef CONFIG_XIP_KERNEL/* * When referencing data in RAM from the XIP region in a relative manner * with the MMU off, we need the relative offset between the two physical * addresses.  The macro below achieves this, which is: *    __pa(v_data) - __xip_pa(v_text) */#define PHYS_RELATIVE(v_data, v_text) \	(((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \	 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \          CONFIG_XIP_PHYS_ADDR))#else#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))#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. * * PFNs are used to describe any physical page; this means * PFN 0 == physical address 0. */ #if defined(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 unsigned long __pv_phys_pfn_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	((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)#define PHYS_PFN_OFFSET	(__pv_phys_pfn_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_nodebug(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#define PHYS_PFN_OFFSET	((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) static inline phys_addr_t __virt_to_phys_nodebug(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 #define virt_to_pfn(kaddr) \	((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \	 PHYS_PFN_OFFSET) #define __pa_symbol_nodebug(x)	__virt_to_phys_nodebug((x)) #ifdef CONFIG_DEBUG_VIRTUALextern phys_addr_t __virt_to_phys(unsigned long x);extern phys_addr_t __phys_addr_symbol(unsigned long x);#else#define __virt_to_phys(x)	__virt_to_phys_nodebug(x)#define __phys_addr_symbol(x)	__pa_symbol_nodebug(x)#endif /* * 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. */#define virt_to_phys virt_to_physstatic inline phys_addr_t virt_to_phys(const volatile void *x){	return __virt_to_phys((unsigned long)(x));} #define phys_to_virt phys_to_virtstatic 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 __pa_symbol(x)		__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))#define pfn_to_kaddr(pfn)	__va((phys_addr_t)(pfn) << PAGE_SHIFT) extern long long arch_phys_to_idmap_offset; /* * These are for systems that have a hardware interconnect supported alias * of physical memory for idmap purposes.  Most cases should leave these * untouched.  Note: this can only return addresses less than 4GiB. */static inline bool arm_has_idmap_alias(void){	return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;} #define IDMAP_INVALID_ADDR ((u32)~0) static inline unsigned long phys_to_idmap(phys_addr_t addr){	if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {		addr += arch_phys_to_idmap_offset;		if (addr > (u32)~0)			addr = IDMAP_INVALID_ADDR;	}	return addr;} static inline phys_addr_t idmap_to_phys(unsigned long idmap){	phys_addr_t addr = idmap; 	if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)		addr -= arch_phys_to_idmap_offset; 	return addr;} static inline unsigned long __virt_to_idmap(unsigned long x){	return phys_to_idmap(__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 /* * 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(virt_to_pfn(kaddr))#define virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \					&& pfn_valid(virt_to_pfn(kaddr))) #endif #include <asm-generic/memory_model.h> #endif