1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_CSKY_PAGE_H 4 #define __ASM_CSKY_PAGE_H 5 6 #include <asm/setup.h> 7 #include <asm/cache.h> 8 #include <linux/const.h> 9 10 /* 11 * PAGE_SHIFT determines the page size 12 */ 13 #define PAGE_SHIFT 12 14 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 15 #define PAGE_MASK (~(PAGE_SIZE - 1)) 16 #define THREAD_SIZE (PAGE_SIZE * 2) 17 #define THREAD_MASK (~(THREAD_SIZE - 1)) 18 #define THREAD_SHIFT (PAGE_SHIFT + 1) 19 20 /* 21 * NOTE: virtual isn't really correct, actually it should be the offset into the 22 * memory node, but we have no highmem, so that works for now. 23 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots 24 * of the shifts unnecessary. 25 */ 26 27 #ifndef __ASSEMBLY__ 28 29 #include <linux/pfn.h> 30 31 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 32 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 33 34 #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \ 35 (void *)(kaddr) < high_memory) 36 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 37 38 extern void *memset(void *dest, int c, size_t l); 39 extern void *memcpy(void *to, const void *from, size_t l); 40 41 #define clear_page(page) memset((page), 0, PAGE_SIZE) 42 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 43 44 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 45 #define phys_to_page(paddr) (pfn_to_page(PFN_DOWN(paddr))) 46 47 struct page; 48 49 #include <abi/page.h> 50 51 struct vm_area_struct; 52 53 /* 54 * These are used to make use of C type-checking.. 55 */ 56 typedef struct { unsigned long pte_low; } pte_t; 57 #define pte_val(x) ((x).pte_low) 58 59 typedef struct { unsigned long pgd; } pgd_t; 60 typedef struct { unsigned long pgprot; } pgprot_t; 61 typedef struct page *pgtable_t; 62 63 #define pgd_val(x) ((x).pgd) 64 #define pgprot_val(x) ((x).pgprot) 65 66 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 67 68 #define __pte(x) ((pte_t) { (x) }) 69 #define __pgd(x) ((pgd_t) { (x) }) 70 #define __pgprot(x) ((pgprot_t) { (x) }) 71 72 #endif /* !__ASSEMBLY__ */ 73 74 #define PHYS_OFFSET (CONFIG_RAM_BASE & ~(LOWMEM_LIMIT - 1)) 75 #define PHYS_OFFSET_OFFSET (CONFIG_RAM_BASE & (LOWMEM_LIMIT - 1)) 76 #define ARCH_PFN_OFFSET PFN_DOWN(CONFIG_RAM_BASE) 77 78 #define PAGE_OFFSET 0x80000000 79 #define LOWMEM_LIMIT 0x40000000 80 81 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 82 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - \ 83 PHYS_OFFSET)) 84 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 85 86 #define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ 87 PHYS_OFFSET_OFFSET) 88 #define virt_to_page(x) (mem_map + MAP_NR(x)) 89 90 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 91 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 92 93 /* 94 * main RAM and kernel working space are coincident at 0x80000000, but to make 95 * life more interesting, there's also an uncached virtual shadow at 0xb0000000 96 * - these mappings are fixed in the MMU 97 */ 98 99 #define pfn_to_kaddr(x) __va(PFN_PHYS(x)) 100 101 #include <asm-generic/memory_model.h> 102 #include <asm-generic/getorder.h> 103 104 #endif /* __ASM_CSKY_PAGE_H */ 105