| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (C) 2005-2017 Andes Technology Corporation |
| 3 | |
| 4 | #ifndef __ASM_NDS32_MEMORY_H |
| 5 | #define __ASM_NDS32_MEMORY_H |
| 6 | |
| 7 | #include <linux/compiler.h> |
| 8 | #include <linux/sizes.h> |
| 9 | |
| 10 | #ifndef __ASSEMBLY__ |
| 11 | #include <asm/page.h> |
| 12 | #endif |
| 13 | |
| 14 | #ifndef PHYS_OFFSET |
| 15 | #define PHYS_OFFSET (0x0) |
| 16 | #endif |
| 17 | |
| 18 | /* |
| 19 | * TASK_SIZE - the maximum size of a user space task. |
| 20 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area |
| 21 | */ |
| 22 | #define TASK_SIZE ((CONFIG_PAGE_OFFSET) - (SZ_32M)) |
| 23 | #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M) |
| 24 | #define PAGE_OFFSET (CONFIG_PAGE_OFFSET) |
| 25 | |
| 26 | /* |
| 27 | * Physical vs virtual RAM address space conversion. These are |
| 28 | * private definitions which should NOT be used outside memory.h |
| 29 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. |
| 30 | */ |
| 31 | #ifndef __virt_to_phys |
| 32 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) |
| 33 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) |
| 34 | #endif |
| 35 | |
| 36 | /* |
| 37 | * The module space lives between the addresses given by TASK_SIZE |
| 38 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. |
| 39 | */ |
| 40 | #define MODULES_END (PAGE_OFFSET) |
| 41 | #define MODULES_VADDR (MODULES_END - SZ_32M) |
| 42 | |
| 43 | #if TASK_SIZE > MODULES_VADDR |
| 44 | #error Top of user space clashes with start of module space |
| 45 | #endif |
| 46 | |
| 47 | #ifndef __ASSEMBLY__ |
| 48 | |
| 49 | /* |
| 50 | * PFNs are used to describe any physical page; this means |
| 51 | * PFN 0 == physical address 0. |
| 52 | * |
| 53 | * This is the PFN of the first RAM page in the kernel |
| 54 | * direct-mapped view. We assume this is the first page |
| 55 | * of RAM in the mem_map as well. |
| 56 | */ |
| 57 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) |
| 58 | |
| 59 | /* |
| 60 | * Drivers should NOT use these either. |
| 61 | */ |
| 62 | #define __pa(x) __virt_to_phys((unsigned long)(x)) |
| 63 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) |
| 64 | |
| 65 | /* |
| 66 | * Conversion between a struct page and a physical address. |
| 67 | * |
| 68 | * Note: when converting an unknown physical address to a |
| 69 | * struct page, the resulting pointer must be validated |
| 70 | * using VALID_PAGE(). It must return an invalid struct page |
| 71 | * for any physical address not corresponding to a system |
| 72 | * RAM address. |
| 73 | * |
| 74 | * pfn_valid(pfn) indicates whether a PFN number is valid |
| 75 | * |
| 76 | * virt_to_page(k) convert a _valid_ virtual address to struct page * |
| 77 | * virt_addr_valid(k) indicates whether a virtual address is valid |
| 78 | */ |
| 79 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
| 80 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) |
| 81 | |
| 82 | #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) |
| 83 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
| 84 | |
| 85 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) |
| 86 | |
| 87 | #endif |
| 88 | |
| 89 | #include <asm-generic/memory_model.h> |
| 90 | |
| 91 | #endif |