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 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#endif 63 64extern pte_t *pkmap_page_table; 65 66void *kmap_high(struct page *page); 67void kunmap_high(struct page *page); 68 69static inline void *kmap(struct page *page) 70{ 71 /* Check if this memory layout is broken because PKMAP overlaps 72 * page table. 73 */ 74 BUILD_BUG_ON(PKMAP_BASE < 75 XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE); 76 BUG_ON(in_interrupt()); 77 if (!PageHighMem(page)) 78 return page_address(page); 79 return kmap_high(page); 80} 81 82static inline void kunmap(struct page *page) 83{ 84 BUG_ON(in_interrupt()); 85 if (!PageHighMem(page)) 86 return; 87 kunmap_high(page); 88} 89 90static inline void flush_cache_kmaps(void) 91{ 92 flush_cache_all(); 93} 94 95void *kmap_atomic(struct page *page); 96void __kunmap_atomic(void *kvaddr); 97 98void kmap_init(void); 99 100#endif 101