1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __ASM_GENERIC_PAGE_H 3*4882a593Smuzhiyun #define __ASM_GENERIC_PAGE_H 4*4882a593Smuzhiyun /* 5*4882a593Smuzhiyun * Generic page.h implementation, for NOMMU architectures. 6*4882a593Smuzhiyun * This provides the dummy definitions for the memory management. 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #ifdef CONFIG_MMU 10*4882a593Smuzhiyun #error need to provide a real asm/page.h 11*4882a593Smuzhiyun #endif 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun /* PAGE_SHIFT determines the page size */ 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #define PAGE_SHIFT 12 17*4882a593Smuzhiyun #ifdef __ASSEMBLY__ 18*4882a593Smuzhiyun #define PAGE_SIZE (1 << PAGE_SHIFT) 19*4882a593Smuzhiyun #else 20*4882a593Smuzhiyun #define PAGE_SIZE (1UL << PAGE_SHIFT) 21*4882a593Smuzhiyun #endif 22*4882a593Smuzhiyun #define PAGE_MASK (~(PAGE_SIZE-1)) 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun #include <asm/setup.h> 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun #define clear_page(page) memset((page), 0, PAGE_SIZE) 29*4882a593Smuzhiyun #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun #define clear_user_page(page, vaddr, pg) clear_page(page) 32*4882a593Smuzhiyun #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun /* 35*4882a593Smuzhiyun * These are used to make use of C type-checking.. 36*4882a593Smuzhiyun */ 37*4882a593Smuzhiyun typedef struct { 38*4882a593Smuzhiyun unsigned long pte; 39*4882a593Smuzhiyun } pte_t; 40*4882a593Smuzhiyun typedef struct { 41*4882a593Smuzhiyun unsigned long pmd[16]; 42*4882a593Smuzhiyun } pmd_t; 43*4882a593Smuzhiyun typedef struct { 44*4882a593Smuzhiyun unsigned long pgd; 45*4882a593Smuzhiyun } pgd_t; 46*4882a593Smuzhiyun typedef struct { 47*4882a593Smuzhiyun unsigned long pgprot; 48*4882a593Smuzhiyun } pgprot_t; 49*4882a593Smuzhiyun typedef struct page *pgtable_t; 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun #define pte_val(x) ((x).pte) 52*4882a593Smuzhiyun #define pmd_val(x) ((&x)->pmd[0]) 53*4882a593Smuzhiyun #define pgd_val(x) ((x).pgd) 54*4882a593Smuzhiyun #define pgprot_val(x) ((x).pgprot) 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun #define __pte(x) ((pte_t) { (x) } ) 57*4882a593Smuzhiyun #define __pmd(x) ((pmd_t) { (x) } ) 58*4882a593Smuzhiyun #define __pgd(x) ((pgd_t) { (x) } ) 59*4882a593Smuzhiyun #define __pgprot(x) ((pgprot_t) { (x) } ) 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun extern unsigned long memory_start; 62*4882a593Smuzhiyun extern unsigned long memory_end; 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun #endif /* !__ASSEMBLY__ */ 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun #ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS 67*4882a593Smuzhiyun #define PAGE_OFFSET (CONFIG_KERNEL_RAM_BASE_ADDRESS) 68*4882a593Smuzhiyun #else 69*4882a593Smuzhiyun #define PAGE_OFFSET (0) 70*4882a593Smuzhiyun #endif 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun #ifndef ARCH_PFN_OFFSET 73*4882a593Smuzhiyun #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 74*4882a593Smuzhiyun #endif 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun #define __va(x) ((void *)((unsigned long) (x))) 79*4882a593Smuzhiyun #define __pa(x) ((unsigned long) (x)) 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 82*4882a593Smuzhiyun #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun #define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) 85*4882a593Smuzhiyun #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun #ifndef page_to_phys 88*4882a593Smuzhiyun #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) 89*4882a593Smuzhiyun #endif 90*4882a593Smuzhiyun 91*4882a593Smuzhiyun #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ 94*4882a593Smuzhiyun ((void *)(kaddr) < (void *)memory_end)) 95*4882a593Smuzhiyun 96*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */ 97*4882a593Smuzhiyun 98*4882a593Smuzhiyun #include <asm-generic/memory_model.h> 99*4882a593Smuzhiyun #include <asm-generic/getorder.h> 100*4882a593Smuzhiyun 101*4882a593Smuzhiyun #endif /* __ASM_GENERIC_PAGE_H */ 102