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 #include <vdso/page.h> 11 12 #define THREAD_SIZE (PAGE_SIZE * 2) 13 #define THREAD_MASK (~(THREAD_SIZE - 1)) 14 #define THREAD_SHIFT (PAGE_SHIFT + 1) 15 16 17 /* 18 * For C-SKY "User-space:Kernel-space" is "2GB:2GB" fixed by hardware and there 19 * are two segment registers (MSA0 + MSA1) to mapping 512MB + 512MB physical 20 * address region. We use them mapping kernel 1GB direct-map address area and 21 * for more than 1GB of memory we use highmem. 22 */ 23 #define PAGE_OFFSET CONFIG_PAGE_OFFSET 24 #define SSEG_SIZE 0x20000000 25 #define LOWMEM_LIMIT (SSEG_SIZE * 2) 26 27 #define PHYS_OFFSET_OFFSET (CONFIG_DRAM_BASE & (SSEG_SIZE - 1)) 28 29 #ifndef __ASSEMBLY__ 30 31 #include <linux/pfn.h> 32 33 #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \ 34 (void *)(kaddr) < high_memory) 35 36 extern void *memset(void *dest, int c, size_t l); 37 extern void *memcpy(void *to, const void *from, size_t l); 38 39 #define clear_page(page) memset((page), 0, PAGE_SIZE) 40 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 41 42 struct page; 43 44 #include <abi/page.h> 45 46 struct vm_area_struct; 47 48 typedef struct { unsigned long pte_low; } pte_t; 49 #define pte_val(x) ((x).pte_low) 50 51 typedef struct { unsigned long pgd; } pgd_t; 52 typedef struct { unsigned long pgprot; } pgprot_t; 53 typedef struct page *pgtable_t; 54 55 #define pgd_val(x) ((x).pgd) 56 #define pgprot_val(x) ((x).pgprot) 57 58 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 59 60 #define __pte(x) ((pte_t) { (x) }) 61 #define __pgd(x) ((pgd_t) { (x) }) 62 #define __pgprot(x) ((pgprot_t) { (x) }) 63 64 extern unsigned long va_pa_offset; 65 66 #define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET) 67 68 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset) 69 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset)) 70 71 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 72 73 static inline unsigned long virt_to_pfn(const void *kaddr) 74 { 75 return __pa(kaddr) >> PAGE_SHIFT; 76 } 77 78 #define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ 79 PHYS_OFFSET_OFFSET) 80 #define virt_to_page(x) (mem_map + MAP_NR(x)) 81 82 #define pfn_to_kaddr(x) __va(PFN_PHYS(x)) 83 84 #include <asm-generic/memory_model.h> 85 #include <asm-generic/getorder.h> 86 87 #endif /* !__ASSEMBLY__ */ 88 #endif /* __ASM_CSKY_PAGE_H */ 89