2 * arch/arm/include/asm/memory.h
4 * Copyright (C) 2000-2002 Russell King
5 * modification for nommu, Hyok S. Choi, 2004
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.
11 * Note: this file should not be included by non-asm/.h files
13 #ifndef __ASM_ARM_MEMORY_H
14 #define __ASM_ARM_MEMORY_H
16 #include <linux/compiler.h>
17 #include <linux/const.h>
18 #include <linux/types.h>
19 #include <linux/sizes.h>
21 #ifdef CONFIG_NEED_MACH_MEMORY_H
22 #include <mach/memory.h>
26 * Allow for constants defined here to be used from assembly code
27 * by prepending the UL suffix only with actual C code compilation.
29 #define UL(x) _AC(x, UL)
31 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
32 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
37 * TASK_SIZE - the maximum size of a user space task.
38 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
40 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
41 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
44 * The maximum size of a 26-bit user space task.
46 #define TASK_SIZE_26 (UL(1) << 26)
49 * The module space lives between the addresses given by TASK_SIZE
50 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
52 #ifndef CONFIG_THUMB2_KERNEL
53 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
55 /* smaller range for Thumb-2 symbols relocation (2^24)*/
56 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
59 #if TASK_SIZE > MODULES_VADDR
60 #error Top of user space clashes with start of module space
64 * The highmem pkmap virtual space shares the end of the module area.
67 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
69 #define MODULES_END (PAGE_OFFSET)
73 * The XIP kernel gets mapped at the bottom of the module vm area.
74 * Since we use sections to map it, this macro replaces the physical address
75 * with its virtual address while keeping offset from the base section.
77 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
79 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
81 * Allow 16MB-aligned ioremap pages
83 #define IOREMAP_MAX_ORDER 24
86 #else /* CONFIG_MMU */
89 * The limitation of user task size can grow up to the end of free ram region.
90 * It is difficult to define and perhaps will never meet the original meaning
91 * of this define that was meant to.
92 * Fortunately, there is no reference for this in noMMU mode, for now.
94 #define TASK_SIZE UL(0xffffffff)
96 #ifndef TASK_UNMAPPED_BASE
97 #define TASK_UNMAPPED_BASE UL(0x00000000)
101 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
105 * The module can be at any place in ram in nommu mode.
107 #define MODULES_END (END_MEM)
108 #define MODULES_VADDR PAGE_OFFSET
110 #define XIP_VIRT_ADDR(physaddr) (physaddr)
112 #endif /* !CONFIG_MMU */
114 #ifdef CONFIG_XIP_KERNEL
115 #define KERNEL_START _sdata
117 #define KERNEL_START _stext
119 #define KERNEL_END _end
122 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
125 #ifdef CONFIG_HAVE_TCM
126 #define ITCM_OFFSET UL(0xfffe0000)
127 #define DTCM_OFFSET UL(0xfffe8000)
131 * Convert a page to/from a physical address
133 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
134 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
137 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
138 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
139 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
140 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
142 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
144 #ifdef CONFIG_XIP_KERNEL
146 * When referencing data in RAM from the XIP region in a relative manner
147 * with the MMU off, we need the relative offset between the two physical
148 * addresses. The macro below achieves this, which is:
149 * __pa(v_data) - __xip_pa(v_text)
151 #define PHYS_RELATIVE(v_data, v_text) \
152 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
153 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
154 CONFIG_XIP_PHYS_ADDR))
156 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
162 * Physical vs virtual RAM address space conversion. These are
163 * private definitions which should NOT be used outside memory.h
164 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
166 * PFNs are used to describe any physical page; this means
167 * PFN 0 == physical address 0.
170 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
173 * Constants used to force the right instruction encodings and shifts
174 * so that all we need to do is modify the 8-bit constant field.
176 #define __PV_BITS_31_24 0x81000000
177 #define __PV_BITS_7_0 0x81
179 extern unsigned long __pv_phys_pfn_offset;
180 extern u64 __pv_offset;
181 extern void fixup_pv_table(const void *, unsigned long);
182 extern const void *__pv_table_begin, *__pv_table_end;
184 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
185 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
187 #define __pv_stub(from,to,instr,type) \
188 __asm__("@ __pv_stub\n" \
189 "1: " instr " %0, %1, %2\n" \
190 " .pushsection .pv_table,\"a\"\n" \
194 : "r" (from), "I" (type))
196 #define __pv_stub_mov_hi(t) \
197 __asm__ volatile("@ __pv_stub_mov\n" \
199 " .pushsection .pv_table,\"a\"\n" \
203 : "I" (__PV_BITS_7_0))
205 #define __pv_add_carry_stub(x, y) \
206 __asm__ volatile("@ __pv_add_carry_stub\n" \
207 "1: adds %Q0, %1, %2\n" \
208 " adc %R0, %R0, #0\n" \
209 " .pushsection .pv_table,\"a\"\n" \
213 : "r" (x), "I" (__PV_BITS_31_24) \
216 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
220 if (sizeof(phys_addr_t) == 4) {
221 __pv_stub(x, t, "add", __PV_BITS_31_24);
224 __pv_add_carry_stub(x, t);
229 static inline unsigned long __phys_to_virt(phys_addr_t x)
234 * 'unsigned long' cast discard upper word when
235 * phys_addr_t is 64 bit, and makes sure that inline
236 * assembler expression receives 32 bit argument
237 * in place where 'r' 32 bit operand is expected.
239 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
245 #define PHYS_OFFSET PLAT_PHYS_OFFSET
246 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
248 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
250 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
253 static inline unsigned long __phys_to_virt(phys_addr_t x)
255 return x - PHYS_OFFSET + PAGE_OFFSET;
260 #define virt_to_pfn(kaddr) \
261 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
264 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
266 #ifdef CONFIG_DEBUG_VIRTUAL
267 extern phys_addr_t __virt_to_phys(unsigned long x);
268 extern phys_addr_t __phys_addr_symbol(unsigned long x);
270 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
271 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
275 * These are *only* valid on the kernel direct mapped RAM memory.
276 * Note: Drivers should NOT use these. They are the wrong
277 * translation for translating DMA addresses. Use the driver
278 * DMA support - see dma-mapping.h.
280 #define virt_to_phys virt_to_phys
281 static inline phys_addr_t virt_to_phys(const volatile void *x)
283 return __virt_to_phys((unsigned long)(x));
286 #define phys_to_virt phys_to_virt
287 static inline void *phys_to_virt(phys_addr_t x)
289 return (void *)__phys_to_virt(x);
293 * Drivers should NOT use these either.
295 #define __pa(x) __virt_to_phys((unsigned long)(x))
296 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
297 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
298 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
300 extern long long arch_phys_to_idmap_offset;
303 * These are for systems that have a hardware interconnect supported alias
304 * of physical memory for idmap purposes. Most cases should leave these
305 * untouched. Note: this can only return addresses less than 4GiB.
307 static inline bool arm_has_idmap_alias(void)
309 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
312 #define IDMAP_INVALID_ADDR ((u32)~0)
314 static inline unsigned long phys_to_idmap(phys_addr_t addr)
316 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
317 addr += arch_phys_to_idmap_offset;
319 addr = IDMAP_INVALID_ADDR;
324 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
326 phys_addr_t addr = idmap;
328 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
329 addr -= arch_phys_to_idmap_offset;
334 static inline unsigned long __virt_to_idmap(unsigned long x)
336 return phys_to_idmap(__virt_to_phys(x));
339 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
342 * Virtual <-> DMA view memory address translations
343 * Again, these are *only* valid on the kernel direct mapped RAM
344 * memory. Use of these is *deprecated* (and that doesn't mean
345 * use the __ prefixed forms instead.) See dma-mapping.h.
347 #ifndef __virt_to_bus
348 #define __virt_to_bus __virt_to_phys
349 #define __bus_to_virt __phys_to_virt
350 #define __pfn_to_bus(x) __pfn_to_phys(x)
351 #define __bus_to_pfn(x) __phys_to_pfn(x)
355 * Conversion between a struct page and a physical address.
357 * page_to_pfn(page) convert a struct page * to a PFN number
358 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
360 * virt_to_page(k) convert a _valid_ virtual address to struct page *
361 * virt_addr_valid(k) indicates whether a virtual address is valid
363 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
365 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
366 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
367 && pfn_valid(virt_to_pfn(kaddr)))
371 #include <asm-generic/memory_model.h>