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