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Diffstat (limited to 'arch/arm/include/asm/memory.h')
-rw-r--r-- | arch/arm/include/asm/memory.h | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h new file mode 100644 index 0000000000..ef2aa79ece --- /dev/null +++ b/arch/arm/include/asm/memory.h @@ -0,0 +1,396 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * arch/arm/include/asm/memory.h + * + * Copyright (C) 2000-2002 Russell King + * modification for nommu, Hyok S. Choi, 2004 + * + * Note: this file should not be included explicitly, include <asm/page.h> + * to get access to these definitions. + */ +#ifndef __ASM_ARM_MEMORY_H +#define __ASM_ARM_MEMORY_H + +#ifndef _ASMARM_PAGE_H +#error "Do not include <asm/memory.h> directly" +#endif + +#include <linux/compiler.h> +#include <linux/const.h> +#include <linux/types.h> +#include <linux/sizes.h> + +#ifdef CONFIG_NEED_MACH_MEMORY_H +#include <mach/memory.h> +#endif +#include <asm/kasan_def.h> + +/* + * PAGE_OFFSET: the virtual address of the start of lowmem, memory above + * the virtual address range for userspace. + * KERNEL_OFFSET: the virtual address of the start of the kernel image. + * we may further offset this with TEXT_OFFSET in practice. + */ +#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) +#define KERNEL_OFFSET (PAGE_OFFSET) + +#ifdef CONFIG_MMU + +/* + * TASK_SIZE - the maximum size of a user space task. + * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area + */ +#ifndef CONFIG_KASAN +#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) +#else +#define TASK_SIZE (KASAN_SHADOW_START) +#endif +#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) + +/* + * The maximum size of a 26-bit user space task. + */ +#define TASK_SIZE_26 (UL(1) << 26) + +/* + * The module space lives between the addresses given by TASK_SIZE + * and PAGE_OFFSET - it must be within 32MB of the kernel text. + */ +#ifndef CONFIG_THUMB2_KERNEL +#define MODULES_VADDR (PAGE_OFFSET - SZ_16M) +#else +/* smaller range for Thumb-2 symbols relocation (2^24)*/ +#define MODULES_VADDR (PAGE_OFFSET - SZ_8M) +#endif + +#if TASK_SIZE > MODULES_VADDR +#error Top of user space clashes with start of module space +#endif + +/* + * The highmem pkmap virtual space shares the end of the module area. + */ +#ifdef CONFIG_HIGHMEM +#define MODULES_END (PAGE_OFFSET - PMD_SIZE) +#else +#define MODULES_END (PAGE_OFFSET) +#endif + +/* + * The XIP kernel gets mapped at the bottom of the module vm area. + * Since we use sections to map it, this macro replaces the physical address + * with its virtual address while keeping offset from the base section. + */ +#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) + +#define FDT_FIXED_BASE UL(0xff800000) +#define FDT_FIXED_SIZE (2 * SECTION_SIZE) +#define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE)) + +#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) +/* + * Allow 16MB-aligned ioremap pages + */ +#define IOREMAP_MAX_ORDER 24 +#endif + +#define VECTORS_BASE UL(0xffff0000) + +#else /* CONFIG_MMU */ + +#ifndef __ASSEMBLY__ +extern unsigned long setup_vectors_base(void); +extern unsigned long vectors_base; +#define VECTORS_BASE vectors_base +#endif + +/* + * The limitation of user task size can grow up to the end of free ram region. + * It is difficult to define and perhaps will never meet the original meaning + * of this define that was meant to. + * Fortunately, there is no reference for this in noMMU mode, for now. + */ +#define TASK_SIZE UL(0xffffffff) + +#ifndef TASK_UNMAPPED_BASE +#define TASK_UNMAPPED_BASE UL(0x00000000) +#endif + +#ifndef END_MEM +#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) +#endif + +/* + * The module can be at any place in ram in nommu mode. + */ +#define MODULES_END (END_MEM) +#define MODULES_VADDR PAGE_OFFSET + +#define XIP_VIRT_ADDR(physaddr) (physaddr) +#define FDT_VIRT_BASE(physbase) ((void *)(physbase)) + +#endif /* !CONFIG_MMU */ + +#ifdef CONFIG_XIP_KERNEL +#define KERNEL_START _sdata +#else +#define KERNEL_START _stext +#endif +#define KERNEL_END _end + +/* + * We fix the TCM memories max 32 KiB ITCM resp DTCM at these + * locations + */ +#ifdef CONFIG_HAVE_TCM +#define ITCM_OFFSET UL(0xfffe0000) +#define DTCM_OFFSET UL(0xfffe8000) +#endif + +/* + * Convert a page to/from a physical address + */ +#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) +#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) + +/* + * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical + * memory. This is used for XIP and NoMMU kernels, and on platforms that don't + * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use + * PLAT_PHYS_OFFSET and not PHYS_OFFSET. + */ +#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) + +#ifndef __ASSEMBLY__ + +/* + * Physical start and end address of the kernel sections. These addresses are + * 2MB-aligned to match the section mappings placed over the kernel. We use + * u64 so that LPAE mappings beyond the 32bit limit will work out as well. + */ +extern u64 kernel_sec_start; +extern u64 kernel_sec_end; + +/* + * Physical vs virtual RAM address space conversion. These are + * private definitions which should NOT be used outside memory.h + * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. + * + * PFNs are used to describe any physical page; this means + * PFN 0 == physical address 0. + */ + +#if defined(CONFIG_ARM_PATCH_PHYS_VIRT) + +/* + * Constants used to force the right instruction encodings and shifts + * so that all we need to do is modify the 8-bit constant field. + */ +#define __PV_BITS_31_24 0x81000000 +#define __PV_BITS_23_16 0x810000 +#define __PV_BITS_7_0 0x81 + +extern unsigned long __pv_phys_pfn_offset; +extern u64 __pv_offset; +extern void fixup_pv_table(const void *, unsigned long); +extern const void *__pv_table_begin, *__pv_table_end; + +#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) +#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) + +#ifndef CONFIG_THUMB2_KERNEL +#define __pv_stub(from,to,instr) \ + __asm__("@ __pv_stub\n" \ + "1: " instr " %0, %1, %2\n" \ + "2: " instr " %0, %0, %3\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 1b - ., 2b - .\n" \ + " .popsection\n" \ + : "=r" (to) \ + : "r" (from), "I" (__PV_BITS_31_24), \ + "I"(__PV_BITS_23_16)) + +#define __pv_add_carry_stub(x, y) \ + __asm__("@ __pv_add_carry_stub\n" \ + "0: movw %R0, #0\n" \ + " adds %Q0, %1, %R0, lsl #20\n" \ + "1: mov %R0, %2\n" \ + " adc %R0, %R0, #0\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 0b - ., 1b - .\n" \ + " .popsection\n" \ + : "=&r" (y) \ + : "r" (x), "I" (__PV_BITS_7_0) \ + : "cc") + +#else +#define __pv_stub(from,to,instr) \ + __asm__("@ __pv_stub\n" \ + "0: movw %0, #0\n" \ + " lsl %0, #21\n" \ + " " instr " %0, %1, %0\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 0b - .\n" \ + " .popsection\n" \ + : "=&r" (to) \ + : "r" (from)) + +#define __pv_add_carry_stub(x, y) \ + __asm__("@ __pv_add_carry_stub\n" \ + "0: movw %R0, #0\n" \ + " lsls %R0, #21\n" \ + " adds %Q0, %1, %R0\n" \ + "1: mvn %R0, #0\n" \ + " adc %R0, %R0, #0\n" \ + " .pushsection .pv_table,\"a\"\n" \ + " .long 0b - ., 1b - .\n" \ + " .popsection\n" \ + : "=&r" (y) \ + : "r" (x) \ + : "cc") +#endif + +static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) +{ + phys_addr_t t; + + if (sizeof(phys_addr_t) == 4) { + __pv_stub(x, t, "add"); + } else { + __pv_add_carry_stub(x, t); + } + return t; +} + +static inline unsigned long __phys_to_virt(phys_addr_t x) +{ + unsigned long t; + + /* + * 'unsigned long' cast discard upper word when + * phys_addr_t is 64 bit, and makes sure that inline + * assembler expression receives 32 bit argument + * in place where 'r' 32 bit operand is expected. + */ + __pv_stub((unsigned long) x, t, "sub"); + return t; +} + +#else + +#define PHYS_OFFSET PLAT_PHYS_OFFSET +#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) + +static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x) +{ + return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; +} + +static inline unsigned long __phys_to_virt(phys_addr_t x) +{ + return x - PHYS_OFFSET + PAGE_OFFSET; +} + +#endif + +static inline unsigned long virt_to_pfn(const void *p) +{ + unsigned long kaddr = (unsigned long)p; + return (((kaddr - PAGE_OFFSET) >> PAGE_SHIFT) + + PHYS_PFN_OFFSET); +} +#define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x)) + +#ifdef CONFIG_DEBUG_VIRTUAL +extern phys_addr_t __virt_to_phys(unsigned long x); +extern phys_addr_t __phys_addr_symbol(unsigned long x); +#else +#define __virt_to_phys(x) __virt_to_phys_nodebug(x) +#define __phys_addr_symbol(x) __pa_symbol_nodebug(x) +#endif + +/* + * These are *only* valid on the kernel direct mapped RAM memory. + * Note: Drivers should NOT use these. They are the wrong + * translation for translating DMA addresses. Use the driver + * DMA support - see dma-mapping.h. + */ +#define virt_to_phys virt_to_phys +static inline phys_addr_t virt_to_phys(const volatile void *x) +{ + return __virt_to_phys((unsigned long)(x)); +} + +#define phys_to_virt phys_to_virt +static inline void *phys_to_virt(phys_addr_t x) +{ + return (void *)__phys_to_virt(x); +} + +/* + * Drivers should NOT use these either. + */ +#define __pa(x) __virt_to_phys((unsigned long)(x)) +#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) +#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) +#define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT) + +extern long long arch_phys_to_idmap_offset; + +/* + * These are for systems that have a hardware interconnect supported alias + * of physical memory for idmap purposes. Most cases should leave these + * untouched. Note: this can only return addresses less than 4GiB. + */ +static inline bool arm_has_idmap_alias(void) +{ + return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; +} + +#define IDMAP_INVALID_ADDR ((u32)~0) + +static inline unsigned long phys_to_idmap(phys_addr_t addr) +{ + if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) { + addr += arch_phys_to_idmap_offset; + if (addr > (u32)~0) + addr = IDMAP_INVALID_ADDR; + } + return addr; +} + +static inline phys_addr_t idmap_to_phys(unsigned long idmap) +{ + phys_addr_t addr = idmap; + + if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) + addr -= arch_phys_to_idmap_offset; + + return addr; +} + +static inline unsigned long __virt_to_idmap(unsigned long x) +{ + return phys_to_idmap(__virt_to_phys(x)); +} + +#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) + +/* + * Conversion between a struct page and a physical address. + * + * page_to_pfn(page) convert a struct page * to a PFN number + * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * + * + * virt_to_page(k) convert a _valid_ virtual address to struct page * + * virt_addr_valid(k) indicates whether a virtual address is valid + */ +#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET + +#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) +#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ + && pfn_valid(virt_to_pfn(kaddr))) + +#endif + +#endif |