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Linux/arch/xtensa/include/asm/highmem.h

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  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 #include <linux/wait.h>
 16 #include <asm/cacheflush.h>
 17 #include <asm/fixmap.h>
 18 #include <asm/kmap_types.h>
 19 #include <asm/pgtable.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 #endif
 63 
 64 extern pte_t *pkmap_page_table;
 65 
 66 void *kmap_high(struct page *page);
 67 void kunmap_high(struct page *page);
 68 
 69 static inline void *kmap(struct page *page)
 70 {
 71         BUG_ON(in_interrupt());
 72         if (!PageHighMem(page))
 73                 return page_address(page);
 74         return kmap_high(page);
 75 }
 76 
 77 static inline void kunmap(struct page *page)
 78 {
 79         BUG_ON(in_interrupt());
 80         if (!PageHighMem(page))
 81                 return;
 82         kunmap_high(page);
 83 }
 84 
 85 static inline void flush_cache_kmaps(void)
 86 {
 87         flush_cache_all();
 88 }
 89 
 90 void *kmap_atomic(struct page *page);
 91 void __kunmap_atomic(void *kvaddr);
 92 
 93 void kmap_init(void);
 94 
 95 #endif
 96 

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