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Diffstat (limited to '')
-rw-r--r-- | arch/xtensa/include/asm/highmem.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h new file mode 100644 index 0000000000..34b8b620e7 --- /dev/null +++ b/arch/xtensa/include/asm/highmem.h @@ -0,0 +1,84 @@ +/* + * 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 + +#ifdef CONFIG_HIGHMEM +#include <linux/wait.h> +#include <linux/pgtable.h> +#include <asm/cacheflush.h> +#include <asm/fixmap.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; +} + +enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn); +#define arch_kmap_local_map_idx kmap_local_map_idx + +enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr); +#define arch_kmap_local_unmap_idx kmap_local_unmap_idx + +#endif + +extern pte_t *pkmap_page_table; + +static inline void flush_cache_kmaps(void) +{ + flush_cache_all(); +} + +#define arch_kmap_local_post_unmap(vaddr) \ + local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE) + +void kmap_init(void); + +#endif /* CONFIG_HIGHMEM */ +#endif |