1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
4  */
5 
6 #ifndef _ASM_HIGHMEM_H
7 #define _ASM_HIGHMEM_H
8 
9 #ifdef CONFIG_HIGHMEM
10 
11 #include <uapi/asm/page.h>
12 #include <asm/kmap_size.h>
13 
14 #define FIXMAP_SIZE		PGDIR_SIZE
15 #define PKMAP_SIZE		PGDIR_SIZE
16 
17 /* start after vmalloc area */
18 #define FIXMAP_BASE		(PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
19 
20 #define FIX_KMAP_SLOTS		(KM_MAX_IDX * NR_CPUS)
21 #define FIX_KMAP_BEGIN		(0UL)
22 #define FIX_KMAP_END		((FIX_KMAP_BEGIN + FIX_KMAP_SLOTS) - 1)
23 
24 #define FIXADDR_TOP		(FIXMAP_BASE + (FIX_KMAP_END << PAGE_SHIFT))
25 
26 /*
27  * This should be converted to the asm-generic version, but of course this
28  * is needlessly different from all other architectures. Sigh - tglx
29  */
30 #define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))
31 #define __virt_to_fix(x)	(((FIXADDR_TOP - ((x) & PAGE_MASK))) >> PAGE_SHIFT)
32 
33 /* start after fixmap area */
34 #define PKMAP_BASE		(FIXMAP_BASE + FIXMAP_SIZE)
35 #define LAST_PKMAP		(PKMAP_SIZE >> PAGE_SHIFT)
36 #define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
37 #define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))
38 #define PKMAP_NR(virt)		(((virt) - PKMAP_BASE) >> PAGE_SHIFT)
39 
40 #include <asm/cacheflush.h>
41 
42 extern void kmap_init(void);
43 
44 #define arch_kmap_local_post_unmap(vaddr)			\
45 	local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE)
46 
flush_cache_kmaps(void)47 static inline void flush_cache_kmaps(void)
48 {
49 	flush_cache_all();
50 }
51 #endif
52 
53 #endif
54