1 /*
2 * include/asm-xtensa/highmem.h
3 *
4 * This file is subject to the terms and conditions of the GNU General
5 * Public License. See the file "COPYING" in the main directory of
6 * this archive for more details.
7 *
8 * Copyright (C) 2003 - 2005 Tensilica Inc.
9 * Copyright (C) 2014 Cadence Design Systems Inc.
10 */
11
12 #ifndef _XTENSA_HIGHMEM_H
13 #define _XTENSA_HIGHMEM_H
14
15 #ifdef CONFIG_HIGHMEM
16 #include <linux/wait.h>
17 #include <linux/pgtable.h>
18 #include <asm/cacheflush.h>
19 #include <asm/fixmap.h>
20
21 #define PKMAP_BASE ((FIXADDR_START - \
22 (LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK)
23 #define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS)
24 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
25 #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
26 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
27
28 #define kmap_prot PAGE_KERNEL_EXEC
29
30 #if DCACHE_WAY_SIZE > PAGE_SIZE
31 #define get_pkmap_color get_pkmap_color
32 static inline int get_pkmap_color(struct page *page)
33 {
34 return DCACHE_ALIAS(page_to_phys(page));
35 }
36
37 extern unsigned int last_pkmap_nr_arr[];
38
39 static inline unsigned int get_next_pkmap_nr(unsigned int color)
40 {
41 last_pkmap_nr_arr[color] =
42 (last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK;
43 return last_pkmap_nr_arr[color] + color;
44 }
45
46 static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
47 {
48 return pkmap_nr < DCACHE_N_COLORS;
49 }
50
51 static inline int get_pkmap_entries_count(unsigned int color)
52 {
53 return LAST_PKMAP / DCACHE_N_COLORS;
54 }
55
56 extern wait_queue_head_t pkmap_map_wait_arr[];
57
58 static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
59 {
60 return pkmap_map_wait_arr + color;
61 }
62
63 enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn);
64 #define arch_kmap_local_map_idx kmap_local_map_idx
65
66 enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr);
67 #define arch_kmap_local_unmap_idx kmap_local_unmap_idx
68
69 #endif
70
71 extern pte_t *pkmap_page_table;
72
73 static inline void flush_cache_kmaps(void)
74 {
75 flush_cache_all();
76 }
77
78 #define arch_kmap_local_post_unmap(vaddr) \
79 local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE)
80
81 void kmap_init(void);
82
83 #endif /* CONFIG_HIGHMEM */
84 #endif
85
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.