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
32static inline int get_pkmap_color(struct page *page)
33{
34	return DCACHE_ALIAS(page_to_phys(page));
35}
36
37extern unsigned int last_pkmap_nr_arr[];
38
39static 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
46static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
47{
48	return pkmap_nr < DCACHE_N_COLORS;
49}
50
51static inline int get_pkmap_entries_count(unsigned int color)
52{
53	return LAST_PKMAP / DCACHE_N_COLORS;
54}
55
56extern wait_queue_head_t pkmap_map_wait_arr[];
57
58static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
59{
60	return pkmap_map_wait_arr + color;
61}
62
63enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn);
64#define arch_kmap_local_map_idx		kmap_local_map_idx
65
66enum 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
71extern pte_t *pkmap_page_table;
72
73static 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
81void kmap_init(void);
82
83#endif /* CONFIG_HIGHMEM */
84#endif
85