1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_GENERIC_PAGE_H 3 #define __ASM_GENERIC_PAGE_H 4 /* 5 * Generic page.h implementation, for NOMMU architectures. 6 * This provides the dummy definitions for the memory management. 7 */ 8 9 #ifdef CONFIG_MMU 10 #error need to prove a real asm/page.h 11 #endif 12 13 14 /* PAGE_SHIFT determines the page size */ 15 16 #define PAGE_SHIFT 12 17 #ifdef __ASSEMBLY__ 18 #define PAGE_SIZE (1 << PAGE_SHIFT) 19 #else 20 #define PAGE_SIZE (1UL << PAGE_SHIFT) 21 #endif 22 #define PAGE_MASK (~(PAGE_SIZE-1)) 23 24 #include <asm/setup.h> 25 26 #ifndef __ASSEMBLY__ 27 28 #define clear_page(page) memset((page), 0, PAGE_SIZE) 29 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) 30 31 #define clear_user_page(page, vaddr, pg) clear_page(page) 32 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 33 34 /* 35 * These are used to make use of C type-checking.. 36 */ 37 typedef struct { 38 unsigned long pte; 39 } pte_t; 40 typedef struct { 41 unsigned long pmd[16]; 42 } pmd_t; 43 typedef struct { 44 unsigned long pgd; 45 } pgd_t; 46 typedef struct { 47 unsigned long pgprot; 48 } pgprot_t; 49 typedef struct page *pgtable_t; 50 51 #define pte_val(x) ((x).pte) 52 #define pmd_val(x) ((&x)->pmd[0]) 53 #define pgd_val(x) ((x).pgd) 54 #define pgprot_val(x) ((x).pgprot) 55 56 #define __pte(x) ((pte_t) { (x) } ) 57 #define __pmd(x) ((pmd_t) { (x) } ) 58 #define __pgd(x) ((pgd_t) { (x) } ) 59 #define __pgprot(x) ((pgprot_t) { (x) } ) 60 61 extern unsigned long memory_start; 62 extern unsigned long memory_end; 63 64 #endif /* !__ASSEMBLY__ */ 65 66 #ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS 67 #define PAGE_OFFSET (CONFIG_KERNEL_RAM_BASE_ADDRESS) 68 #else 69 #define PAGE_OFFSET (0) 70 #endif 71 72 #ifndef ARCH_PFN_OFFSET 73 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 74 #endif 75 76 #ifndef __ASSEMBLY__ 77 78 #define __va(x) ((void *)((unsigned long) (x))) 79 #define __pa(x) ((unsigned long) (x)) 80 81 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 82 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 83 84 #define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) 85 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 86 87 #ifndef page_to_phys 88 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) 89 #endif 90 91 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 92 93 #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ 94 ((void *)(kaddr) < (void *)memory_end)) 95 96 #endif /* __ASSEMBLY__ */ 97 98 #include <asm-generic/memory_model.h> 99 #include <asm-generic/getorder.h> 100 101 #endif /* __ASM_GENERIC_PAGE_H */ 102