projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9a8fd558 CZ |
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. | |
| 65559100 | 9 | * Copyright (C) 2014 Cadence Design Systems Inc. |
| 9a8fd558 CZ |
10 | */ |
| 11 | ||
| 12 | #ifndef _XTENSA_HIGHMEM_H | |
| 13 | #define _XTENSA_HIGHMEM_H | |
| 14 | ||
| 8504b503 | 15 | #include <linux/wait.h> |
| 65559100 MF |
16 | #include <asm/cacheflush.h> |
| 17 | #include <asm/fixmap.h> | |
| 18 | #include <asm/kmap_types.h> | |
| 19 | #include <asm/pgtable.h> | |
| 20 | ||
| 8504b503 MF |
21 | #define PKMAP_BASE ((FIXADDR_START - \ |
| 22 | (LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK) | |
| 23 | #define LAST_PKMAP (PTRS_PER_PTE * DCACHE_N_COLORS) | |
| 65559100 MF |
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 | ||
| ff009ab6 | 28 | #define kmap_prot PAGE_KERNEL_EXEC |
| 65559100 | 29 | |
| 8504b503 MF |
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 | #endif | |
| 63 | ||
| 65559100 MF |
64 | extern pte_t *pkmap_page_table; |
| 65 | ||
| 66 | void *kmap_high(struct page *page); | |
| 67 | void kunmap_high(struct page *page); | |
| 68 | ||
| 69 | static inline void *kmap(struct page *page) | |
| 70 | { | |
| d39af902 MF |
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); | |
| 65559100 MF |
76 | BUG_ON(in_interrupt()); |
| 77 | if (!PageHighMem(page)) | |
| 78 | return page_address(page); | |
| 79 | return kmap_high(page); | |
| 80 | } | |
| 81 | ||
| 82 | static inline void kunmap(struct page *page) | |
| 83 | { | |
| 84 | BUG_ON(in_interrupt()); | |
| 85 | if (!PageHighMem(page)) | |
| 86 | return; | |
| 87 | kunmap_high(page); | |
| 88 | } | |
| 89 | ||
| 90 | static inline void flush_cache_kmaps(void) | |
| 91 | { | |
| 92 | flush_cache_all(); | |
| 93 | } | |
| 94 | ||
| 95 | void *kmap_atomic(struct page *page); | |
| 96 | void __kunmap_atomic(void *kvaddr); | |
| 97 | ||
| 98 | void kmap_init(void); | |
| 9a8fd558 CZ |
99 | |
| 100 | #endif |