1367b8112SChris Zankel /* 2367b8112SChris Zankel * include/asm-xtensa/highmem.h 3367b8112SChris Zankel * 4367b8112SChris Zankel * This file is subject to the terms and conditions of the GNU General 5367b8112SChris Zankel * Public License. See the file "COPYING" in the main directory of 6367b8112SChris Zankel * this archive for more details. 7367b8112SChris Zankel * 8367b8112SChris Zankel * Copyright (C) 2003 - 2005 Tensilica Inc. 965559100SMax Filippov * Copyright (C) 2014 Cadence Design Systems Inc. 10367b8112SChris Zankel */ 11367b8112SChris Zankel 12367b8112SChris Zankel #ifndef _XTENSA_HIGHMEM_H 13367b8112SChris Zankel #define _XTENSA_HIGHMEM_H 14367b8112SChris Zankel 158504b503SMax Filippov #include <linux/wait.h> 1665559100SMax Filippov #include <asm/cacheflush.h> 1765559100SMax Filippov #include <asm/fixmap.h> 1865559100SMax Filippov #include <asm/kmap_types.h> 1965559100SMax Filippov #include <asm/pgtable.h> 2065559100SMax Filippov 218504b503SMax Filippov #define PKMAP_BASE ((FIXADDR_START - \ 228504b503SMax Filippov (LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK) 238504b503SMax Filippov #define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS) 2465559100SMax Filippov #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 2565559100SMax Filippov #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) 2665559100SMax Filippov #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 2765559100SMax Filippov 28ff009ab6SMax Filippov #define kmap_prot PAGE_KERNEL_EXEC 2965559100SMax Filippov 308504b503SMax Filippov #if DCACHE_WAY_SIZE > PAGE_SIZE 318504b503SMax Filippov #define get_pkmap_color get_pkmap_color 328504b503SMax Filippov static inline int get_pkmap_color(struct page *page) 338504b503SMax Filippov { 348504b503SMax Filippov return DCACHE_ALIAS(page_to_phys(page)); 358504b503SMax Filippov } 368504b503SMax Filippov 378504b503SMax Filippov extern unsigned int last_pkmap_nr_arr[]; 388504b503SMax Filippov 398504b503SMax Filippov static inline unsigned int get_next_pkmap_nr(unsigned int color) 408504b503SMax Filippov { 418504b503SMax Filippov last_pkmap_nr_arr[color] = 428504b503SMax Filippov (last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK; 438504b503SMax Filippov return last_pkmap_nr_arr[color] + color; 448504b503SMax Filippov } 458504b503SMax Filippov 468504b503SMax Filippov static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color) 478504b503SMax Filippov { 488504b503SMax Filippov return pkmap_nr < DCACHE_N_COLORS; 498504b503SMax Filippov } 508504b503SMax Filippov 518504b503SMax Filippov static inline int get_pkmap_entries_count(unsigned int color) 528504b503SMax Filippov { 538504b503SMax Filippov return LAST_PKMAP / DCACHE_N_COLORS; 548504b503SMax Filippov } 558504b503SMax Filippov 568504b503SMax Filippov extern wait_queue_head_t pkmap_map_wait_arr[]; 578504b503SMax Filippov 588504b503SMax Filippov static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color) 598504b503SMax Filippov { 608504b503SMax Filippov return pkmap_map_wait_arr + color; 618504b503SMax Filippov } 628504b503SMax Filippov #endif 638504b503SMax Filippov 6465559100SMax Filippov extern pte_t *pkmap_page_table; 6565559100SMax Filippov 6665559100SMax Filippov void *kmap_high(struct page *page); 6765559100SMax Filippov void kunmap_high(struct page *page); 6865559100SMax Filippov 6965559100SMax Filippov static inline void *kmap(struct page *page) 7065559100SMax Filippov { 7165559100SMax Filippov BUG_ON(in_interrupt()); 7265559100SMax Filippov if (!PageHighMem(page)) 7365559100SMax Filippov return page_address(page); 7465559100SMax Filippov return kmap_high(page); 7565559100SMax Filippov } 7665559100SMax Filippov 7765559100SMax Filippov static inline void kunmap(struct page *page) 7865559100SMax Filippov { 7965559100SMax Filippov BUG_ON(in_interrupt()); 8065559100SMax Filippov if (!PageHighMem(page)) 8165559100SMax Filippov return; 8265559100SMax Filippov kunmap_high(page); 8365559100SMax Filippov } 8465559100SMax Filippov 8565559100SMax Filippov static inline void flush_cache_kmaps(void) 8665559100SMax Filippov { 8765559100SMax Filippov flush_cache_all(); 8865559100SMax Filippov } 8965559100SMax Filippov 9065559100SMax Filippov void *kmap_atomic(struct page *page); 9165559100SMax Filippov void __kunmap_atomic(void *kvaddr); 9265559100SMax Filippov 9365559100SMax Filippov void kmap_init(void); 94367b8112SChris Zankel 95367b8112SChris Zankel #endif 96