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: 4KB 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 /* 22 * For C-SKY "User-space:Kernel-space" is "2GB:2GB" fixed by hardware and there 23 * are two segment registers (MSA0 + MSA1) to mapping 512MB + 512MB physical 24 * address region. We use them mapping kernel 1GB direct-map address area and 25 * for more than 1GB of memory we use highmem. 26 */ 27 #define PAGE_OFFSET 0x80000000 28 #define SSEG_SIZE 0x20000000 29 #define LOWMEM_LIMIT (SSEG_SIZE * 2) 30 31 #define PHYS_OFFSET_OFFSET (CONFIG_RAM_BASE & (SSEG_SIZE - 1)) 32 33 #ifndef __ASSEMBLY__ 34 35 #include <linux/pfn.h> 36 37 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 38 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 39 40 #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \ 41 (void *)(kaddr) < high_memory) 42 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 43 44 extern void *memset(void *dest, int c, size_t l); 45 extern void *memcpy(void *to, const void *from, size_t l); 46 47 #define clear_page(page) memset((page), 0, PAGE_SIZE) 48 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 49 50 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 51 #define phys_to_page(paddr) (pfn_to_page(PFN_DOWN(paddr))) 52 53 struct page; 54 55 #include <abi/page.h> 56 57 struct vm_area_struct; 58 59 typedef struct { unsigned long pte_low; } pte_t; 60 #define pte_val(x) ((x).pte_low) 61 62 typedef struct { unsigned long pgd; } pgd_t; 63 typedef struct { unsigned long pgprot; } pgprot_t; 64 typedef struct page *pgtable_t; 65 66 #define pgd_val(x) ((x).pgd) 67 #define pgprot_val(x) ((x).pgprot) 68 69 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 70 71 #define __pte(x) ((pte_t) { (x) }) 72 #define __pgd(x) ((pgd_t) { (x) }) 73 #define __pgprot(x) ((pgprot_t) { (x) }) 74 75 extern unsigned long va_pa_offset; 76 77 #define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET) 78 79 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset) 80 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset)) 81 82 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 83 84 #define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ 85 PHYS_OFFSET_OFFSET) 86 #define virt_to_page(x) (mem_map + MAP_NR(x)) 87 88 #define pfn_to_kaddr(x) __va(PFN_PHYS(x)) 89 90 #include <asm-generic/memory_model.h> 91 #include <asm-generic/getorder.h> 92 93 #endif /* !__ASSEMBLY__ */ 94 #endif /* __ASM_CSKY_PAGE_H */ 95