1/*
  2 *  arch/arm/include/asm/memory.h
  3 *
  4 *  Copyright (C) 2000-2002 Russell King
  5 *  modification for nommu, Hyok S. Choi, 2004
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 *
 11 *  Note: this file should not be included by non-asm/.h files
 12 */
 13#ifndef __ASM_ARM_MEMORY_H
 14#define __ASM_ARM_MEMORY_H
 15
 16#include <linux/compiler.h>
 17#include <linux/const.h>
 18#include <linux/types.h>
 
 
 
 19#include <mach/memory.h>
 20#include <asm/sizes.h>
 21
 22/*
 23 * Allow for constants defined here to be used from assembly code
 24 * by prepending the UL suffix only with actual C code compilation.
 25 */
 26#define UL(x) _AC(x, UL)
 27
 28#ifdef CONFIG_MMU
 29
 30/*
 31 * PAGE_OFFSET - the virtual address of the start of the kernel image
 32 * TASK_SIZE - the maximum size of a user space task.
 33 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 34 */
 35#define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
 36#define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
 37#define TASK_UNMAPPED_BASE	(UL(CONFIG_PAGE_OFFSET) / 3)
 38
 39/*
 40 * The maximum size of a 26-bit user space task.
 41 */
 42#define TASK_SIZE_26		UL(0x04000000)
 43
 44/*
 45 * The module space lives between the addresses given by TASK_SIZE
 46 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
 47 */
 48#ifndef CONFIG_THUMB2_KERNEL
 49#define MODULES_VADDR		(PAGE_OFFSET - 16*1024*1024)
 50#else
 51/* smaller range for Thumb-2 symbols relocation (2^24)*/
 52#define MODULES_VADDR		(PAGE_OFFSET - 8*1024*1024)
 53#endif
 54
 55#if TASK_SIZE > MODULES_VADDR
 56#error Top of user space clashes with start of module space
 57#endif
 58
 59/*
 60 * The highmem pkmap virtual space shares the end of the module area.
 61 */
 62#ifdef CONFIG_HIGHMEM
 63#define MODULES_END		(PAGE_OFFSET - PMD_SIZE)
 64#else
 65#define MODULES_END		(PAGE_OFFSET)
 66#endif
 67
 68/*
 69 * The XIP kernel gets mapped at the bottom of the module vm area.
 70 * Since we use sections to map it, this macro replaces the physical address
 71 * with its virtual address while keeping offset from the base section.
 72 */
 73#define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
 74
 
 75/*
 76 * Allow 16MB-aligned ioremap pages
 77 */
 78#define IOREMAP_MAX_ORDER	24
 79
 80/*
 81 * Size of DMA-consistent memory region.  Must be multiple of 2M,
 82 * between 2MB and 14MB inclusive.
 83 */
 84#ifndef CONSISTENT_DMA_SIZE
 85#define CONSISTENT_DMA_SIZE 	SZ_2M
 86#endif
 87
 88#define CONSISTENT_END		(0xffe00000UL)
 89#define CONSISTENT_BASE		(CONSISTENT_END - CONSISTENT_DMA_SIZE)
 90
 91#else /* CONFIG_MMU */
 92
 
 
 
 
 
 
 93/*
 94 * The limitation of user task size can grow up to the end of free ram region.
 95 * It is difficult to define and perhaps will never meet the original meaning
 96 * of this define that was meant to.
 97 * Fortunately, there is no reference for this in noMMU mode, for now.
 98 */
 99#ifndef TASK_SIZE
100#define TASK_SIZE		(CONFIG_DRAM_SIZE)
101#endif
102
103#ifndef TASK_UNMAPPED_BASE
104#define TASK_UNMAPPED_BASE	UL(0x00000000)
105#endif
106
107#ifndef PHYS_OFFSET
108#define PHYS_OFFSET 		UL(CONFIG_DRAM_BASE)
109#endif
110
111#ifndef END_MEM
112#define END_MEM     		(UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
113#endif
114
115#ifndef PAGE_OFFSET
116#define PAGE_OFFSET		(PHYS_OFFSET)
117#endif
118
119/*
120 * The module can be at any place in ram in nommu mode.
121 */
122#define MODULES_END		(END_MEM)
123#define MODULES_VADDR		(PHYS_OFFSET)
 
 
124
125#endif /* !CONFIG_MMU */
126
 
 
 
 
 
 
 
127/*
128 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
129 * locations
130 */
131#ifdef CONFIG_HAVE_TCM
132#define ITCM_OFFSET	UL(0xfffe0000)
133#define DTCM_OFFSET	UL(0xfffe8000)
134#endif
135
136/*
137 * Convert a physical address to a Page Frame Number and back
138 */
139#define	__phys_to_pfn(paddr)	((unsigned long)((paddr) >> PAGE_SHIFT))
140#define	__pfn_to_phys(pfn)	((phys_addr_t)(pfn) << PAGE_SHIFT)
141
142/*
143 * Convert a page to/from a physical address
144 */
145#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
146#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))
147
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
148#ifndef __ASSEMBLY__
149
150/*
151 * Physical vs virtual RAM address space conversion.  These are
152 * private definitions which should NOT be used outside memory.h
153 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 
 
 
154 */
155#ifndef __virt_to_phys
156#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
157
158/*
159 * Constants used to force the right instruction encodings and shifts
160 * so that all we need to do is modify the 8-bit constant field.
161 */
162#define __PV_BITS_31_24	0x81000000
163#define __PV_BITS_23_16	0x00810000
 
 
 
 
 
164
165extern unsigned long __pv_phys_offset;
166#define PHYS_OFFSET __pv_phys_offset
167
168#define __pv_stub(from,to,instr,type)			\
169	__asm__("@ __pv_stub\n"				\
170	"1:	" instr "	%0, %1, %2\n"		\
171	"	.pushsection .pv_table,\"a\"\n"		\
172	"	.long	1b\n"				\
173	"	.popsection\n"				\
174	: "=r" (to)					\
175	: "r" (from), "I" (type))
176
177static inline unsigned long __virt_to_phys(unsigned long x)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
178{
179	unsigned long t;
180	__pv_stub(x, t, "add", __PV_BITS_31_24);
181#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
182	__pv_stub(t, t, "add", __PV_BITS_23_16);
183#endif
 
 
 
184	return t;
185}
186
187static inline unsigned long __phys_to_virt(unsigned long x)
188{
189	unsigned long t;
190	__pv_stub(x, t, "sub", __PV_BITS_31_24);
191#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
192	__pv_stub(t, t, "sub", __PV_BITS_23_16);
193#endif
 
 
 
 
194	return t;
195}
 
196#else
197#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
198#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
199#endif
200#endif
201
202#ifndef PHYS_OFFSET
203#define PHYS_OFFSET	PLAT_PHYS_OFFSET
 
 
 
 
 
 
 
 
 
 
 
 
204#endif
205
206/*
207 * PFNs are used to describe any physical page; this means
208 * PFN 0 == physical address 0.
209 *
210 * This is the PFN of the first RAM page in the kernel
211 * direct-mapped view.  We assume this is the first page
212 * of RAM in the mem_map as well.
213 */
214#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
 
 
 
 
215
216/*
217 * These are *only* valid on the kernel direct mapped RAM memory.
218 * Note: Drivers should NOT use these.  They are the wrong
219 * translation for translating DMA addresses.  Use the driver
220 * DMA support - see dma-mapping.h.
221 */
 
222static inline phys_addr_t virt_to_phys(const volatile void *x)
223{
224	return __virt_to_phys((unsigned long)(x));
225}
226
 
227static inline void *phys_to_virt(phys_addr_t x)
228{
229	return (void *)(__phys_to_virt((unsigned long)(x)));
230}
231
232/*
233 * Drivers should NOT use these either.
234 */
235#define __pa(x)			__virt_to_phys((unsigned long)(x))
236#define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
237#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
238
239/*
240 * Virtual <-> DMA view memory address translations
241 * Again, these are *only* valid on the kernel direct mapped RAM
242 * memory.  Use of these is *deprecated* (and that doesn't mean
243 * use the __ prefixed forms instead.)  See dma-mapping.h.
244 */
245#ifndef __virt_to_bus
246#define __virt_to_bus	__virt_to_phys
247#define __bus_to_virt	__phys_to_virt
248#define __pfn_to_bus(x)	__pfn_to_phys(x)
249#define __bus_to_pfn(x)	__phys_to_pfn(x)
250#endif
251
252static inline __deprecated unsigned long virt_to_bus(void *x)
253{
254	return __virt_to_bus((unsigned long)x);
255}
256
257static inline __deprecated void *bus_to_virt(unsigned long x)
258{
259	return (void *)__bus_to_virt(x);
260}
261
262/*
263 * Conversion between a struct page and a physical address.
264 *
265 * Note: when converting an unknown physical address to a
266 * struct page, the resulting pointer must be validated
267 * using VALID_PAGE().  It must return an invalid struct page
268 * for any physical address not corresponding to a system
269 * RAM address.
270 *
271 *  page_to_pfn(page)	convert a struct page * to a PFN number
272 *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
273 *
274 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
275 *  virt_addr_valid(k)	indicates whether a virtual address is valid
276 */
277#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
278
279#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
280#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
281
282/*
283 * Optional coherency support.  Currently used only by selected
284 * Intel XSC3-based systems.
285 */
286#ifndef arch_is_coherent
287#define arch_is_coherent()		0
288#endif
289
290#endif
291
292#include <asm-generic/memory_model.h>
293
294#endif

  1/*
  2 *  arch/arm/include/asm/memory.h
  3 *
  4 *  Copyright (C) 2000-2002 Russell King
  5 *  modification for nommu, Hyok S. Choi, 2004
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 *
 11 *  Note: this file should not be included by non-asm/.h files
 12 */
 13#ifndef __ASM_ARM_MEMORY_H
 14#define __ASM_ARM_MEMORY_H
 15
 16#include <linux/compiler.h>
 17#include <linux/const.h>
 18#include <linux/types.h>
 19#include <linux/sizes.h>
 20
 21#ifdef CONFIG_NEED_MACH_MEMORY_H
 22#include <mach/memory.h>
 23#endif
 24
 25/* PAGE_OFFSET - the virtual address of the start of the kernel image */
 26#define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
 
 
 
 27
 28#ifdef CONFIG_MMU
 29
 30/*
 
 31 * TASK_SIZE - the maximum size of a user space task.
 32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 33 */
 34#define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
 35#define TASK_UNMAPPED_BASE	ALIGN(TASK_SIZE / 3, SZ_16M)
 
 36
 37/*
 38 * The maximum size of a 26-bit user space task.
 39 */
 40#define TASK_SIZE_26		(UL(1) << 26)
 41
 42/*
 43 * The module space lives between the addresses given by TASK_SIZE
 44 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
 45 */
 46#ifndef CONFIG_THUMB2_KERNEL
 47#define MODULES_VADDR		(PAGE_OFFSET - SZ_16M)
 48#else
 49/* smaller range for Thumb-2 symbols relocation (2^24)*/
 50#define MODULES_VADDR		(PAGE_OFFSET - SZ_8M)
 51#endif
 52
 53#if TASK_SIZE > MODULES_VADDR
 54#error Top of user space clashes with start of module space
 55#endif
 56
 57/*
 58 * The highmem pkmap virtual space shares the end of the module area.
 59 */
 60#ifdef CONFIG_HIGHMEM
 61#define MODULES_END		(PAGE_OFFSET - PMD_SIZE)
 62#else
 63#define MODULES_END		(PAGE_OFFSET)
 64#endif
 65
 66/*
 67 * The XIP kernel gets mapped at the bottom of the module vm area.
 68 * Since we use sections to map it, this macro replaces the physical address
 69 * with its virtual address while keeping offset from the base section.
 70 */
 71#define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
 72
 73#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
 74/*
 75 * Allow 16MB-aligned ioremap pages
 76 */
 77#define IOREMAP_MAX_ORDER	24
 
 
 
 
 
 
 
 78#endif
 79
 80#define VECTORS_BASE		UL(0xffff0000)
 
 81
 82#else /* CONFIG_MMU */
 83
 84#ifndef __ASSEMBLY__
 85extern unsigned long setup_vectors_base(void);
 86extern unsigned long vectors_base;
 87#define VECTORS_BASE		vectors_base
 88#endif
 89
 90/*
 91 * The limitation of user task size can grow up to the end of free ram region.
 92 * It is difficult to define and perhaps will never meet the original meaning
 93 * of this define that was meant to.
 94 * Fortunately, there is no reference for this in noMMU mode, for now.
 95 */
 96#define TASK_SIZE		UL(0xffffffff)
 
 
 97
 98#ifndef TASK_UNMAPPED_BASE
 99#define TASK_UNMAPPED_BASE	UL(0x00000000)
100#endif
101
 
 
 
 
102#ifndef END_MEM
103#define END_MEM     		(UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
104#endif
105
 
 
 
 
106/*
107 * The module can be at any place in ram in nommu mode.
108 */
109#define MODULES_END		(END_MEM)
110#define MODULES_VADDR		PAGE_OFFSET
111
112#define XIP_VIRT_ADDR(physaddr)  (physaddr)
113
114#endif /* !CONFIG_MMU */
115
116#ifdef CONFIG_XIP_KERNEL
117#define KERNEL_START		_sdata
118#else
119#define KERNEL_START		_stext
120#endif
121#define KERNEL_END		_end
122
123/*
124 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
125 * locations
126 */
127#ifdef CONFIG_HAVE_TCM
128#define ITCM_OFFSET	UL(0xfffe0000)
129#define DTCM_OFFSET	UL(0xfffe8000)
130#endif
131
132/*
 
 
 
 
 
 
133 * Convert a page to/from a physical address
134 */
135#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
136#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))
137
138/*
139 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
140 * memory.  This is used for XIP and NoMMU kernels, and on platforms that don't
141 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
142 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
143 */
144#define PLAT_PHYS_OFFSET	UL(CONFIG_PHYS_OFFSET)
145
146#ifdef CONFIG_XIP_KERNEL
147/*
148 * When referencing data in RAM from the XIP region in a relative manner
149 * with the MMU off, we need the relative offset between the two physical
150 * addresses.  The macro below achieves this, which is:
151 *    __pa(v_data) - __xip_pa(v_text)
152 */
153#define PHYS_RELATIVE(v_data, v_text) \
154	(((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
155	 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
156          CONFIG_XIP_PHYS_ADDR))
157#else
158#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
159#endif
160
161#ifndef __ASSEMBLY__
162
163/*
164 * Physical vs virtual RAM address space conversion.  These are
165 * private definitions which should NOT be used outside memory.h
166 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
167 *
168 * PFNs are used to describe any physical page; this means
169 * PFN 0 == physical address 0.
170 */
171
172#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
173
174/*
175 * Constants used to force the right instruction encodings and shifts
176 * so that all we need to do is modify the 8-bit constant field.
177 */
178#define __PV_BITS_31_24	0x81000000
179#define __PV_BITS_7_0	0x81
180
181extern unsigned long __pv_phys_pfn_offset;
182extern u64 __pv_offset;
183extern void fixup_pv_table(const void *, unsigned long);
184extern const void *__pv_table_begin, *__pv_table_end;
185
186#define PHYS_OFFSET	((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
187#define PHYS_PFN_OFFSET	(__pv_phys_pfn_offset)
188
189#define __pv_stub(from,to,instr,type)			\
190	__asm__("@ __pv_stub\n"				\
191	"1:	" instr "	%0, %1, %2\n"		\
192	"	.pushsection .pv_table,\"a\"\n"		\
193	"	.long	1b\n"				\
194	"	.popsection\n"				\
195	: "=r" (to)					\
196	: "r" (from), "I" (type))
197
198#define __pv_stub_mov_hi(t)				\
199	__asm__ volatile("@ __pv_stub_mov\n"		\
200	"1:	mov	%R0, %1\n"			\
201	"	.pushsection .pv_table,\"a\"\n"		\
202	"	.long	1b\n"				\
203	"	.popsection\n"				\
204	: "=r" (t)					\
205	: "I" (__PV_BITS_7_0))
206
207#define __pv_add_carry_stub(x, y)			\
208	__asm__ volatile("@ __pv_add_carry_stub\n"	\
209	"1:	adds	%Q0, %1, %2\n"			\
210	"	adc	%R0, %R0, #0\n"			\
211	"	.pushsection .pv_table,\"a\"\n"		\
212	"	.long	1b\n"				\
213	"	.popsection\n"				\
214	: "+r" (y)					\
215	: "r" (x), "I" (__PV_BITS_31_24)		\
216	: "cc")
217
218static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
219{
220	phys_addr_t t;
221
222	if (sizeof(phys_addr_t) == 4) {
223		__pv_stub(x, t, "add", __PV_BITS_31_24);
224	} else {
225		__pv_stub_mov_hi(t);
226		__pv_add_carry_stub(x, t);
227	}
228	return t;
229}
230
231static inline unsigned long __phys_to_virt(phys_addr_t x)
232{
233	unsigned long t;
234
235	/*
236	 * 'unsigned long' cast discard upper word when
237	 * phys_addr_t is 64 bit, and makes sure that inline
238	 * assembler expression receives 32 bit argument
239	 * in place where 'r' 32 bit operand is expected.
240	 */
241	__pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
242	return t;
243}
244
245#else
 
 
 
 
246
 
247#define PHYS_OFFSET	PLAT_PHYS_OFFSET
248#define PHYS_PFN_OFFSET	((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
249
250static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
251{
252	return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
253}
254
255static inline unsigned long __phys_to_virt(phys_addr_t x)
256{
257	return x - PHYS_OFFSET + PAGE_OFFSET;
258}
259
260#endif
261
262#define virt_to_pfn(kaddr) \
263	((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
264	 PHYS_PFN_OFFSET)
265
266#define __pa_symbol_nodebug(x)	__virt_to_phys_nodebug((x))
267
268#ifdef CONFIG_DEBUG_VIRTUAL
269extern phys_addr_t __virt_to_phys(unsigned long x);
270extern phys_addr_t __phys_addr_symbol(unsigned long x);
271#else
272#define __virt_to_phys(x)	__virt_to_phys_nodebug(x)
273#define __phys_addr_symbol(x)	__pa_symbol_nodebug(x)
274#endif
275
276/*
277 * These are *only* valid on the kernel direct mapped RAM memory.
278 * Note: Drivers should NOT use these.  They are the wrong
279 * translation for translating DMA addresses.  Use the driver
280 * DMA support - see dma-mapping.h.
281 */
282#define virt_to_phys virt_to_phys
283static inline phys_addr_t virt_to_phys(const volatile void *x)
284{
285	return __virt_to_phys((unsigned long)(x));
286}
287
288#define phys_to_virt phys_to_virt
289static inline void *phys_to_virt(phys_addr_t x)
290{
291	return (void *)__phys_to_virt(x);
292}
293
294/*
295 * Drivers should NOT use these either.
296 */
297#define __pa(x)			__virt_to_phys((unsigned long)(x))
298#define __pa_symbol(x)		__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
299#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
300#define pfn_to_kaddr(pfn)	__va((phys_addr_t)(pfn) << PAGE_SHIFT)
301
302extern long long arch_phys_to_idmap_offset;
303
304/*
305 * These are for systems that have a hardware interconnect supported alias
306 * of physical memory for idmap purposes.  Most cases should leave these
307 * untouched.  Note: this can only return addresses less than 4GiB.
308 */
309static inline bool arm_has_idmap_alias(void)
310{
311	return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
312}
313
314#define IDMAP_INVALID_ADDR ((u32)~0)
315
316static inline unsigned long phys_to_idmap(phys_addr_t addr)
317{
318	if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
319		addr += arch_phys_to_idmap_offset;
320		if (addr > (u32)~0)
321			addr = IDMAP_INVALID_ADDR;
322	}
323	return addr;
324}
325
326static inline phys_addr_t idmap_to_phys(unsigned long idmap)
327{
328	phys_addr_t addr = idmap;
329
330	if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
331		addr -= arch_phys_to_idmap_offset;
332
333	return addr;
334}
335
336static inline unsigned long __virt_to_idmap(unsigned long x)
337{
338	return phys_to_idmap(__virt_to_phys(x));
339}
340
341#define virt_to_idmap(x)	__virt_to_idmap((unsigned long)(x))
342
343/*
344 * Virtual <-> DMA view memory address translations
345 * Again, these are *only* valid on the kernel direct mapped RAM
346 * memory.  Use of these is *deprecated* (and that doesn't mean
347 * use the __ prefixed forms instead.)  See dma-mapping.h.
348 */
349#ifndef __virt_to_bus
350#define __virt_to_bus	__virt_to_phys
351#define __bus_to_virt	__phys_to_virt
352#define __pfn_to_bus(x)	__pfn_to_phys(x)
353#define __bus_to_pfn(x)	__phys_to_pfn(x)
354#endif
355
 
 
 
 
 
 
 
 
 
 
356/*
357 * Conversion between a struct page and a physical address.
358 *
 
 
 
 
 
 
359 *  page_to_pfn(page)	convert a struct page * to a PFN number
360 *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
361 *
362 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
363 *  virt_addr_valid(k)	indicates whether a virtual address is valid
364 */
365#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
366
367#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
368#define virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
369					&& pfn_valid(virt_to_pfn(kaddr)))
 
 
 
 
 
 
 
370
371#endif
372
373#include <asm-generic/memory_model.h>
374
375#endif