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 */
115 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
118 #ifdef CONFIG_HAVE_TCM
119 #define ITCM_OFFSET UL(0xfffe0000)
120 #define DTCM_OFFSET UL(0xfffe8000)
124 * Convert a page to/from a physical address
126 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
127 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
130 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
131 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
132 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
133 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
135 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
137 #ifdef CONFIG_XIP_KERNEL
139 * When referencing data in RAM from the XIP region in a relative manner
140 * with the MMU off, we need the relative offset between the two physical
141 * addresses. The macro below achieves this, which is:
142 * __pa(v_data) - __xip_pa(v_text)
144 #define PHYS_RELATIVE(v_data, v_text) \
145 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
146 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
147 CONFIG_XIP_PHYS_ADDR))
149 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
155 * Physical vs virtual RAM address space conversion. These are
156 * private definitions which should NOT be used outside memory.h
157 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
159 * PFNs are used to describe any physical page; this means
160 * PFN 0 == physical address 0.
163 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
166 * Constants used to force the right instruction encodings and shifts
167 * so that all we need to do is modify the 8-bit constant field.
169 #define __PV_BITS_31_24 0x81000000
170 #define __PV_BITS_7_0 0x81
172 extern unsigned long __pv_phys_pfn_offset;
173 extern u64 __pv_offset;
174 extern void fixup_pv_table(const void *, unsigned long);
175 extern const void *__pv_table_begin, *__pv_table_end;
177 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
178 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
180 #define __pv_stub(from,to,instr,type) \
181 __asm__("@ __pv_stub\n" \
182 "1: " instr " %0, %1, %2\n" \
183 " .pushsection .pv_table,\"a\"\n" \
187 : "r" (from), "I" (type))
189 #define __pv_stub_mov_hi(t) \
190 __asm__ volatile("@ __pv_stub_mov\n" \
192 " .pushsection .pv_table,\"a\"\n" \
196 : "I" (__PV_BITS_7_0))
198 #define __pv_add_carry_stub(x, y) \
199 __asm__ volatile("@ __pv_add_carry_stub\n" \
200 "1: adds %Q0, %1, %2\n" \
201 " adc %R0, %R0, #0\n" \
202 " .pushsection .pv_table,\"a\"\n" \
206 : "r" (x), "I" (__PV_BITS_31_24) \
209 static inline phys_addr_t __virt_to_phys(unsigned long x)
213 if (sizeof(phys_addr_t) == 4) {
214 __pv_stub(x, t, "add", __PV_BITS_31_24);
217 __pv_add_carry_stub(x, t);
222 static inline unsigned long __phys_to_virt(phys_addr_t x)
227 * 'unsigned long' cast discard upper word when
228 * phys_addr_t is 64 bit, and makes sure that inline
229 * assembler expression receives 32 bit argument
230 * in place where 'r' 32 bit operand is expected.
232 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
238 #define PHYS_OFFSET PLAT_PHYS_OFFSET
239 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
241 static inline phys_addr_t __virt_to_phys(unsigned long x)
243 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
246 static inline unsigned long __phys_to_virt(phys_addr_t x)
248 return x - PHYS_OFFSET + PAGE_OFFSET;
253 #define virt_to_pfn(kaddr) \
254 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
258 * These are *only* valid on the kernel direct mapped RAM memory.
259 * Note: Drivers should NOT use these. They are the wrong
260 * translation for translating DMA addresses. Use the driver
261 * DMA support - see dma-mapping.h.
263 #define virt_to_phys virt_to_phys
264 static inline phys_addr_t virt_to_phys(const volatile void *x)
266 return __virt_to_phys((unsigned long)(x));
269 #define phys_to_virt phys_to_virt
270 static inline void *phys_to_virt(phys_addr_t x)
272 return (void *)__phys_to_virt(x);
276 * Drivers should NOT use these either.
278 #define __pa(x) __virt_to_phys((unsigned long)(x))
279 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
280 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
282 extern long long arch_phys_to_idmap_offset;
285 * These are for systems that have a hardware interconnect supported alias
286 * of physical memory for idmap purposes. Most cases should leave these
287 * untouched. Note: this can only return addresses less than 4GiB.
289 static inline bool arm_has_idmap_alias(void)
291 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
294 #define IDMAP_INVALID_ADDR ((u32)~0)
296 static inline unsigned long phys_to_idmap(phys_addr_t addr)
298 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
299 addr += arch_phys_to_idmap_offset;
301 addr = IDMAP_INVALID_ADDR;
306 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
308 phys_addr_t addr = idmap;
310 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
311 addr -= arch_phys_to_idmap_offset;
316 static inline unsigned long __virt_to_idmap(unsigned long x)
318 return phys_to_idmap(__virt_to_phys(x));
321 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
324 * Virtual <-> DMA view memory address translations
325 * Again, these are *only* valid on the kernel direct mapped RAM
326 * memory. Use of these is *deprecated* (and that doesn't mean
327 * use the __ prefixed forms instead.) See dma-mapping.h.
329 #ifndef __virt_to_bus
330 #define __virt_to_bus __virt_to_phys
331 #define __bus_to_virt __phys_to_virt
332 #define __pfn_to_bus(x) __pfn_to_phys(x)
333 #define __bus_to_pfn(x) __phys_to_pfn(x)
337 * Conversion between a struct page and a physical address.
339 * page_to_pfn(page) convert a struct page * to a PFN number
340 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
342 * virt_to_page(k) convert a _valid_ virtual address to struct page *
343 * virt_addr_valid(k) indicates whether a virtual address is valid
345 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
347 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
348 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
349 && pfn_valid(virt_to_pfn(kaddr)))
353 #include <asm-generic/memory_model.h>