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 CONFIG_PAGE_SHIFT 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 CONFIG_PAGE_OFFSET 28#define SSEG_SIZE 0x20000000 29#define LOWMEM_LIMIT (SSEG_SIZE * 2) 30 31#define PHYS_OFFSET_OFFSET (CONFIG_DRAM_BASE & (SSEG_SIZE - 1)) 32 33#ifndef __ASSEMBLY__ 34 35#include <linux/pfn.h> 36 37#define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \ 38 (void *)(kaddr) < high_memory) 39 40extern void *memset(void *dest, int c, size_t l); 41extern void *memcpy(void *to, const void *from, size_t l); 42 43#define clear_page(page) memset((page), 0, PAGE_SIZE) 44#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 45 46#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 47#define phys_to_page(paddr) (pfn_to_page(PFN_DOWN(paddr))) 48 49struct page; 50 51#include <abi/page.h> 52 53struct vm_area_struct; 54 55typedef struct { unsigned long pte_low; } pte_t; 56#define pte_val(x) ((x).pte_low) 57 58typedef struct { unsigned long pgd; } pgd_t; 59typedef struct { unsigned long pgprot; } pgprot_t; 60typedef struct page *pgtable_t; 61 62#define pgd_val(x) ((x).pgd) 63#define pgprot_val(x) ((x).pgprot) 64 65#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 66 67#define __pte(x) ((pte_t) { (x) }) 68#define __pgd(x) ((pgd_t) { (x) }) 69#define __pgprot(x) ((pgprot_t) { (x) }) 70 71extern unsigned long va_pa_offset; 72 73#define ARCH_PFN_OFFSET PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET) 74 75#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset) 76#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset)) 77 78#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 79 80static inline unsigned long virt_to_pfn(const void *kaddr) 81{ 82 return __pa(kaddr) >> PAGE_SHIFT; 83} 84 85#define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ 86 PHYS_OFFSET_OFFSET) 87#define virt_to_page(x) (mem_map + MAP_NR(x)) 88 89#define pfn_to_kaddr(x) __va(PFN_PHYS(x)) 90 91#include <asm-generic/memory_model.h> 92#include <asm-generic/getorder.h> 93 94#endif /* !__ASSEMBLY__ */ 95#endif /* __ASM_CSKY_PAGE_H */ 96