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
47 static inline void flush_cache_kmaps(void)
48 {
49 flush_cache_all();
50 }
51 #endif
52
53 #endif
54
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