/* * include/asm-xtensa/highmem.h * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of * this archive for more details. * * Copyright (C) 2003 - 2005 Tensilica Inc. * Copyright (C) 2014 Cadence Design Systems Inc. */ #ifndef _XTENSA_HIGHMEM_H #define _XTENSA_HIGHMEM_H #include <linux/wait.h> #include <asm/cacheflush.h> #include <asm/fixmap.h> #include <asm/kmap_types.h> #include <asm/pgtable.h> #define PKMAP_BASE ((FIXADDR_START - \ (LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK) #define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS) #define LAST_PKMAP_MASK (LAST_PKMAP - 1) #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) #define kmap_prot PAGE_KERNEL_EXEC #if DCACHE_WAY_SIZE > PAGE_SIZE #define get_pkmap_color get_pkmap_color static inline int get_pkmap_color(struct page *page) { return DCACHE_ALIAS(page_to_phys(page)); } extern unsigned int last_pkmap_nr_arr[]; static inline unsigned int get_next_pkmap_nr(unsigned int color) { last_pkmap_nr_arr[color] = (last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK; return last_pkmap_nr_arr[color] + color; } static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color) { return pkmap_nr < DCACHE_N_COLORS; } static inline int get_pkmap_entries_count(unsigned int color) { return LAST_PKMAP / DCACHE_N_COLORS; } extern wait_queue_head_t pkmap_map_wait_arr[]; static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color) { return pkmap_map_wait_arr + color; } #endif extern pte_t *pkmap_page_table; void *kmap_high(struct page *page); void kunmap_high(struct page *page); static inline void *kmap(struct page *page) { /* Check if this memory layout is broken because PKMAP overlaps * page table. */ BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE); BUG_ON(in_interrupt()); if (!PageHighMem(page)) return page_address(page); return kmap_high(page); } static inline void kunmap(struct page *page) { BUG_ON(in_interrupt()); if (!PageHighMem(page)) return; kunmap_high(page); } static inline void flush_cache_kmaps(void) { flush_cache_all(); } void *kmap_atomic(struct page *page); void __kunmap_atomic(void *kvaddr); void kmap_init(void); #endif