1 /* SPDX-License-Identifier: GPL-2.0 */ 2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. 3 4 #ifndef __ASM_CSKY_HIGHMEM_H 5 #define __ASM_CSKY_HIGHMEM_H 6 7 #ifdef __KERNEL__ 8 9 #include <linux/init.h> 10 #include <linux/interrupt.h> 11 #include <linux/uaccess.h> 12 #include <asm/kmap_types.h> 13 #include <asm/cache.h> 14 15 /* undef for production */ 16 #define HIGHMEM_DEBUG 1 17 18 /* declarations for highmem.c */ 19 extern unsigned long highstart_pfn, highend_pfn; 20 21 extern pte_t *pkmap_page_table; 22 23 /* 24 * Right now we initialize only a single pte table. It can be extended 25 * easily, subsequent pte tables have to be allocated in one physical 26 * chunk of RAM. 27 */ 28 #define LAST_PKMAP 1024 29 #define LAST_PKMAP_MASK (LAST_PKMAP-1) 30 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) 31 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 32 33 extern void *kmap_high(struct page *page); 34 extern void kunmap_high(struct page *page); 35 36 extern void *kmap(struct page *page); 37 extern void kunmap(struct page *page); 38 extern void *kmap_atomic(struct page *page); 39 extern void __kunmap_atomic(void *kvaddr); 40 extern void *kmap_atomic_pfn(unsigned long pfn); 41 extern struct page *kmap_atomic_to_page(void *ptr); 42 43 #define flush_cache_kmaps() do {} while (0) 44 45 extern void kmap_init(void); 46 47 #define kmap_prot PAGE_KERNEL 48 49 #endif /* __KERNEL__ */ 50 51 #endif /* __ASM_CSKY_HIGHMEM_H */ 52