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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
33extern void *kmap_high(struct page *page);
34extern void kunmap_high(struct page *page);
35
36extern void *kmap(struct page *page);
37extern void kunmap(struct page *page);
38extern void *kmap_atomic(struct page *page);
39extern void __kunmap_atomic(void *kvaddr);
40extern void *kmap_atomic_pfn(unsigned long pfn);
41extern struct page *kmap_atomic_to_page(void *ptr);
42
43#define flush_cache_kmaps() do {} while (0)
44
45extern void kmap_init(void);
46
47#define kmap_prot PAGE_KERNEL
48
49#endif /* __KERNEL__ */
50
51#endif /* __ASM_CSKY_HIGHMEM_H */