1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_CSKY_HIGHMEM_H 4 #define __ASM_CSKY_HIGHMEM_H 5 6 #ifdef __KERNEL__ 7 8 #include <linux/init.h> 9 #include <linux/interrupt.h> 10 #include <linux/uaccess.h> 11 #include <asm/kmap_size.h> 12 #include <asm/cache.h> 13 14 /* undef for production */ 15 #define HIGHMEM_DEBUG 1 16 17 /* declarations for highmem.c */ 18 extern unsigned long highstart_pfn, highend_pfn; 19 20 extern pte_t *pkmap_page_table; 21 22 /* 23 * Right now we initialize only a single pte table. It can be extended 24 * easily, subsequent pte tables have to be allocated in one physical 25 * chunk of RAM. 26 */ 27 #define LAST_PKMAP 1024 28 #define LAST_PKMAP_MASK (LAST_PKMAP-1) 29 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) 30 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 31 32 #define ARCH_HAS_KMAP_FLUSH_TLB 33 extern void kmap_flush_tlb(unsigned long addr); 34 35 #define flush_cache_kmaps() do {} while (0) 36 37 #define arch_kmap_local_post_map(vaddr, pteval) kmap_flush_tlb(vaddr) 38 #define arch_kmap_local_post_unmap(vaddr) kmap_flush_tlb(vaddr) 39 40 extern void kmap_init(void); 41 42 #endif /* __KERNEL__ */ 43 44 #endif /* __ASM_CSKY_HIGHMEM_H */ 45