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
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