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. We use
164 * u64 so that LPAE mappings beyond the 32bit limit will work out as well.
166 extern u64 kernel_sec_start;
167 extern u64 kernel_sec_end;
170 * Physical vs virtual RAM address space conversion. These are
171 * private definitions which should NOT be used outside memory.h
172 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
174 * PFNs are used to describe any physical page; this means
175 * PFN 0 == physical address 0.
178 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
181 * Constants used to force the right instruction encodings and shifts
182 * so that all we need to do is modify the 8-bit constant field.
184 #define __PV_BITS_31_24 0x81000000
185 #define __PV_BITS_23_16 0x810000
186 #define __PV_BITS_7_0 0x81
188 extern unsigned long __pv_phys_pfn_offset;
189 extern u64 __pv_offset;
190 extern void fixup_pv_table(const void *, unsigned long);
191 extern const void *__pv_table_begin, *__pv_table_end;
193 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
194 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
196 #ifndef CONFIG_THUMB2_KERNEL
197 #define __pv_stub(from,to,instr) \
198 __asm__("@ __pv_stub\n" \
199 "1: " instr " %0, %1, %2\n" \
200 "2: " instr " %0, %0, %3\n" \
201 " .pushsection .pv_table,\"a\"\n" \
202 " .long 1b - ., 2b - .\n" \
205 : "r" (from), "I" (__PV_BITS_31_24), \
206 "I"(__PV_BITS_23_16))
208 #define __pv_add_carry_stub(x, y) \
209 __asm__("@ __pv_add_carry_stub\n" \
210 "0: movw %R0, #0\n" \
211 " adds %Q0, %1, %R0, lsl #20\n" \
213 " adc %R0, %R0, #0\n" \
214 " .pushsection .pv_table,\"a\"\n" \
215 " .long 0b - ., 1b - .\n" \
218 : "r" (x), "I" (__PV_BITS_7_0) \
222 #define __pv_stub(from,to,instr) \
223 __asm__("@ __pv_stub\n" \
226 " " instr " %0, %1, %0\n" \
227 " .pushsection .pv_table,\"a\"\n" \
233 #define __pv_add_carry_stub(x, y) \
234 __asm__("@ __pv_add_carry_stub\n" \
235 "0: movw %R0, #0\n" \
237 " adds %Q0, %1, %R0\n" \
239 " adc %R0, %R0, #0\n" \
240 " .pushsection .pv_table,\"a\"\n" \
241 " .long 0b - ., 1b - .\n" \
248 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
252 if (sizeof(phys_addr_t) == 4) {
253 __pv_stub(x, t, "add");
255 __pv_add_carry_stub(x, t);
260 static inline unsigned long __phys_to_virt(phys_addr_t x)
265 * 'unsigned long' cast discard upper word when
266 * phys_addr_t is 64 bit, and makes sure that inline
267 * assembler expression receives 32 bit argument
268 * in place where 'r' 32 bit operand is expected.
270 __pv_stub((unsigned long) x, t, "sub");
276 #define PHYS_OFFSET PLAT_PHYS_OFFSET
277 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
279 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
281 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
284 static inline unsigned long __phys_to_virt(phys_addr_t x)
286 return x - PHYS_OFFSET + PAGE_OFFSET;
291 #define virt_to_pfn(kaddr) \
292 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
295 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
297 #ifdef CONFIG_DEBUG_VIRTUAL
298 extern phys_addr_t __virt_to_phys(unsigned long x);
299 extern phys_addr_t __phys_addr_symbol(unsigned long x);
301 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
302 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
306 * These are *only* valid on the kernel direct mapped RAM memory.
307 * Note: Drivers should NOT use these. They are the wrong
308 * translation for translating DMA addresses. Use the driver
309 * DMA support - see dma-mapping.h.
311 #define virt_to_phys virt_to_phys
312 static inline phys_addr_t virt_to_phys(const volatile void *x)
314 return __virt_to_phys((unsigned long)(x));
317 #define phys_to_virt phys_to_virt
318 static inline void *phys_to_virt(phys_addr_t x)
320 return (void *)__phys_to_virt(x);
324 * Drivers should NOT use these either.
326 #define __pa(x) __virt_to_phys((unsigned long)(x))
327 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
328 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
329 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
331 extern long long arch_phys_to_idmap_offset;
334 * These are for systems that have a hardware interconnect supported alias
335 * of physical memory for idmap purposes. Most cases should leave these
336 * untouched. Note: this can only return addresses less than 4GiB.
338 static inline bool arm_has_idmap_alias(void)
340 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
343 #define IDMAP_INVALID_ADDR ((u32)~0)
345 static inline unsigned long phys_to_idmap(phys_addr_t addr)
347 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
348 addr += arch_phys_to_idmap_offset;
350 addr = IDMAP_INVALID_ADDR;
355 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
357 phys_addr_t addr = idmap;
359 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
360 addr -= arch_phys_to_idmap_offset;
365 static inline unsigned long __virt_to_idmap(unsigned long x)
367 return phys_to_idmap(__virt_to_phys(x));
370 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
373 * Virtual <-> DMA view memory address translations
374 * Again, these are *only* valid on the kernel direct mapped RAM
375 * memory. Use of these is *deprecated* (and that doesn't mean
376 * use the __ prefixed forms instead.) See dma-mapping.h.
378 #ifndef __virt_to_bus
379 #define __virt_to_bus __virt_to_phys
380 #define __bus_to_virt __phys_to_virt
384 * Conversion between a struct page and a physical address.
386 * page_to_pfn(page) convert a struct page * to a PFN number
387 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
389 * virt_to_page(k) convert a _valid_ virtual address to struct page *
390 * virt_addr_valid(k) indicates whether a virtual address is valid
392 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
394 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
395 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
396 && pfn_valid(virt_to_pfn(kaddr)))
400 #include <asm-generic/memory_model.h>