| /* SPDX-License-Identifier: GPL-2.0 */ |
| // Copyright (C) 2005-2017 Andes Technology Corporation |
| |
| #ifndef __ASM_NDS32_MEMORY_H |
| #define __ASM_NDS32_MEMORY_H |
| |
| #include <linux/compiler.h> |
| #include <linux/sizes.h> |
| |
| #ifndef __ASSEMBLY__ |
| #include <asm/page.h> |
| #endif |
| |
| #ifndef PHYS_OFFSET |
| #define PHYS_OFFSET (0x0) |
| #endif |
| |
| /* |
| * TASK_SIZE - the maximum size of a user space task. |
| * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area |
| */ |
| #define TASK_SIZE ((CONFIG_PAGE_OFFSET) - (SZ_32M)) |
| #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M) |
| #define PAGE_OFFSET (CONFIG_PAGE_OFFSET) |
| |
| /* |
| * 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. |
| */ |
| #ifndef __virt_to_phys |
| #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) |
| #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) |
| #endif |
| |
| /* |
| * The module space lives between the addresses given by TASK_SIZE |
| * and PAGE_OFFSET - it must be within 32MB of the kernel text. |
| */ |
| #define MODULES_END (PAGE_OFFSET) |
| #define MODULES_VADDR (MODULES_END - SZ_32M) |
| |
| #if TASK_SIZE > MODULES_VADDR |
| #error Top of user space clashes with start of module space |
| #endif |
| |
| #ifndef __ASSEMBLY__ |
| |
| /* |
| * PFNs are used to describe any physical page; this means |
| * PFN 0 == physical address 0. |
| * |
| * This is the PFN of the first RAM page in the kernel |
| * direct-mapped view. We assume this is the first page |
| * of RAM in the mem_map as well. |
| */ |
| #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) |
| |
| /* |
| * Drivers should NOT use these either. |
| */ |
| #define __pa(x) __virt_to_phys((unsigned long)(x)) |
| #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) |
| |
| /* |
| * Conversion between a struct page and a physical address. |
| * |
| * Note: when converting an unknown physical address to a |
| * struct page, the resulting pointer must be validated |
| * using VALID_PAGE(). It must return an invalid struct page |
| * for any physical address not corresponding to a system |
| * RAM address. |
| * |
| * pfn_valid(pfn) indicates whether a PFN number is valid |
| * |
| * 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 pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) |
| |
| #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) |
| #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
| |
| #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) |
| |
| #endif |
| |
| #include <asm-generic/memory_model.h> |
| |
| #endif |