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 */ 19extern unsigned long highstart_pfn, highend_pfn; 20 21extern 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#define ARCH_HAS_KMAP_FLUSH_TLB 34extern void kmap_flush_tlb(unsigned long addr); 35extern void *kmap_atomic_pfn(unsigned long pfn); 36 37#define flush_cache_kmaps() do {} while (0) 38 39extern void kmap_init(void); 40 41#endif /* __KERNEL__ */ 42 43#endif /* __ASM_CSKY_HIGHMEM_H */ 44