1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/include/asm/memory.h
5 * Copyright (C) 2000-2002 Russell King
6 * modification for nommu, Hyok S. Choi, 2004
8 * Note: this file should not be included by non-asm/.h files
10 #ifndef __ASM_ARM_MEMORY_H
11 #define __ASM_ARM_MEMORY_H
13 #include <linux/compiler.h>
14 #include <linux/const.h>
15 #include <linux/types.h>
16 #include <linux/sizes.h>
18 #ifdef CONFIG_NEED_MACH_MEMORY_H
19 #include <mach/memory.h>
21 #include <asm/kasan_def.h>
24 * PAGE_OFFSET: the virtual address of the start of lowmem, memory above
25 * the virtual address range for userspace.
26 * KERNEL_OFFSET: the virtual address of the start of the kernel image.
27 * we may further offset this with TEXT_OFFSET in practice.
29 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
30 #define KERNEL_OFFSET (PAGE_OFFSET)
35 * TASK_SIZE - the maximum size of a user space task.
36 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
39 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
41 #define TASK_SIZE (KASAN_SHADOW_START)
43 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
46 * The maximum size of a 26-bit user space task.
48 #define TASK_SIZE_26 (UL(1) << 26)
51 * The module space lives between the addresses given by TASK_SIZE
52 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
54 #ifndef CONFIG_THUMB2_KERNEL
55 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
57 /* smaller range for Thumb-2 symbols relocation (2^24)*/
58 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
61 #if TASK_SIZE > MODULES_VADDR
62 #error Top of user space clashes with start of module space
66 * The highmem pkmap virtual space shares the end of the module area.
69 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
71 #define MODULES_END (PAGE_OFFSET)
75 * The XIP kernel gets mapped at the bottom of the module vm area.
76 * Since we use sections to map it, this macro replaces the physical address
77 * with its virtual address while keeping offset from the base section.
79 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
81 #define FDT_FIXED_BASE UL(0xff800000)
82 #define FDT_FIXED_SIZE (2 * SECTION_SIZE)
83 #define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE))
85 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
87 * Allow 16MB-aligned ioremap pages
89 #define IOREMAP_MAX_ORDER 24
92 #define VECTORS_BASE UL(0xffff0000)
94 #else /* CONFIG_MMU */
97 extern unsigned long setup_vectors_base(void);
98 extern unsigned long vectors_base;
99 #define VECTORS_BASE vectors_base
103 * The limitation of user task size can grow up to the end of free ram region.
104 * It is difficult to define and perhaps will never meet the original meaning
105 * of this define that was meant to.
106 * Fortunately, there is no reference for this in noMMU mode, for now.
108 #define TASK_SIZE UL(0xffffffff)
110 #ifndef TASK_UNMAPPED_BASE
111 #define TASK_UNMAPPED_BASE UL(0x00000000)
115 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
119 * The module can be at any place in ram in nommu mode.
121 #define MODULES_END (END_MEM)
122 #define MODULES_VADDR PAGE_OFFSET
124 #define XIP_VIRT_ADDR(physaddr) (physaddr)
125 #define FDT_VIRT_BASE(physbase) ((void *)(physbase))
127 #endif /* !CONFIG_MMU */
129 #ifdef CONFIG_XIP_KERNEL
130 #define KERNEL_START _sdata
132 #define KERNEL_START _stext
134 #define KERNEL_END _end
137 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
140 #ifdef CONFIG_HAVE_TCM
141 #define ITCM_OFFSET UL(0xfffe0000)
142 #define DTCM_OFFSET UL(0xfffe8000)
146 * Convert a page to/from a physical address
148 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
149 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
152 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
153 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
154 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
155 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
157 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
162 * Physical start and end address of the kernel sections. These addresses are
163 * 2MB-aligned to match the section mappings placed over the kernel.
165 extern u32 kernel_sec_start;
166 extern u32 kernel_sec_end;
169 * Physical vs virtual RAM address space conversion. These are
170 * private definitions which should NOT be used outside memory.h
171 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
173 * PFNs are used to describe any physical page; this means
174 * PFN 0 == physical address 0.
177 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
180 * Constants used to force the right instruction encodings and shifts
181 * so that all we need to do is modify the 8-bit constant field.
183 #define __PV_BITS_31_24 0x81000000
184 #define __PV_BITS_23_16 0x810000
185 #define __PV_BITS_7_0 0x81
187 extern unsigned long __pv_phys_pfn_offset;
188 extern u64 __pv_offset;
189 extern void fixup_pv_table(const void *, unsigned long);
190 extern const void *__pv_table_begin, *__pv_table_end;
192 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
193 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
195 #ifndef CONFIG_THUMB2_KERNEL
196 #define __pv_stub(from,to,instr) \
197 __asm__("@ __pv_stub\n" \
198 "1: " instr " %0, %1, %2\n" \
199 "2: " instr " %0, %0, %3\n" \
200 " .pushsection .pv_table,\"a\"\n" \
201 " .long 1b - ., 2b - .\n" \
204 : "r" (from), "I" (__PV_BITS_31_24), \
205 "I"(__PV_BITS_23_16))
207 #define __pv_add_carry_stub(x, y) \
208 __asm__("@ __pv_add_carry_stub\n" \
209 "0: movw %R0, #0\n" \
210 " adds %Q0, %1, %R0, lsl #20\n" \
212 " adc %R0, %R0, #0\n" \
213 " .pushsection .pv_table,\"a\"\n" \
214 " .long 0b - ., 1b - .\n" \
217 : "r" (x), "I" (__PV_BITS_7_0) \
221 #define __pv_stub(from,to,instr) \
222 __asm__("@ __pv_stub\n" \
225 " " instr " %0, %1, %0\n" \
226 " .pushsection .pv_table,\"a\"\n" \
232 #define __pv_add_carry_stub(x, y) \
233 __asm__("@ __pv_add_carry_stub\n" \
234 "0: movw %R0, #0\n" \
236 " adds %Q0, %1, %R0\n" \
238 " adc %R0, %R0, #0\n" \
239 " .pushsection .pv_table,\"a\"\n" \
240 " .long 0b - ., 1b - .\n" \
247 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
251 if (sizeof(phys_addr_t) == 4) {
252 __pv_stub(x, t, "add");
254 __pv_add_carry_stub(x, t);
259 static inline unsigned long __phys_to_virt(phys_addr_t x)
264 * 'unsigned long' cast discard upper word when
265 * phys_addr_t is 64 bit, and makes sure that inline
266 * assembler expression receives 32 bit argument
267 * in place where 'r' 32 bit operand is expected.
269 __pv_stub((unsigned long) x, t, "sub");
275 #define PHYS_OFFSET PLAT_PHYS_OFFSET
276 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
278 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
280 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
283 static inline unsigned long __phys_to_virt(phys_addr_t x)
285 return x - PHYS_OFFSET + PAGE_OFFSET;
290 #define virt_to_pfn(kaddr) \
291 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
294 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
296 #ifdef CONFIG_DEBUG_VIRTUAL
297 extern phys_addr_t __virt_to_phys(unsigned long x);
298 extern phys_addr_t __phys_addr_symbol(unsigned long x);
300 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
301 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
305 * These are *only* valid on the kernel direct mapped RAM memory.
306 * Note: Drivers should NOT use these. They are the wrong
307 * translation for translating DMA addresses. Use the driver
308 * DMA support - see dma-mapping.h.
310 #define virt_to_phys virt_to_phys
311 static inline phys_addr_t virt_to_phys(const volatile void *x)
313 return __virt_to_phys((unsigned long)(x));
316 #define phys_to_virt phys_to_virt
317 static inline void *phys_to_virt(phys_addr_t x)
319 return (void *)__phys_to_virt(x);
323 * Drivers should NOT use these either.
325 #define __pa(x) __virt_to_phys((unsigned long)(x))
326 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
327 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
328 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
330 extern long long arch_phys_to_idmap_offset;
333 * These are for systems that have a hardware interconnect supported alias
334 * of physical memory for idmap purposes. Most cases should leave these
335 * untouched. Note: this can only return addresses less than 4GiB.
337 static inline bool arm_has_idmap_alias(void)
339 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
342 #define IDMAP_INVALID_ADDR ((u32)~0)
344 static inline unsigned long phys_to_idmap(phys_addr_t addr)
346 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
347 addr += arch_phys_to_idmap_offset;
349 addr = IDMAP_INVALID_ADDR;
354 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
356 phys_addr_t addr = idmap;
358 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
359 addr -= arch_phys_to_idmap_offset;
364 static inline unsigned long __virt_to_idmap(unsigned long x)
366 return phys_to_idmap(__virt_to_phys(x));
369 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
372 * Virtual <-> DMA view memory address translations
373 * Again, these are *only* valid on the kernel direct mapped RAM
374 * memory. Use of these is *deprecated* (and that doesn't mean
375 * use the __ prefixed forms instead.) See dma-mapping.h.
377 #ifndef __virt_to_bus
378 #define __virt_to_bus __virt_to_phys
379 #define __bus_to_virt __phys_to_virt
380 #define __pfn_to_bus(x) __pfn_to_phys(x)
381 #define __bus_to_pfn(x) __phys_to_pfn(x)
385 * Conversion between a struct page and a physical address.
387 * page_to_pfn(page) convert a struct page * to a PFN number
388 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
390 * virt_to_page(k) convert a _valid_ virtual address to struct page *
391 * virt_addr_valid(k) indicates whether a virtual address is valid
393 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
395 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
396 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
397 && pfn_valid(virt_to_pfn(kaddr)))
401 #include <asm-generic/memory_model.h>