| Vineet Gupta | 45890f6 | 2015-03-09 18:53:49 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #ifndef _ASM_HIGHMEM_H |
| 11 | #define _ASM_HIGHMEM_H |
| 12 | |
| 13 | #ifdef CONFIG_HIGHMEM |
| 14 | |
| 15 | #include <uapi/asm/page.h> |
| 16 | #include <asm/kmap_types.h> |
| 17 | |
| 18 | /* start after vmalloc area */ |
| 19 | #define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) |
| 20 | #define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ |
| 21 | #define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) |
| 22 | #define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) |
| 23 | |
| 24 | /* start after fixmap area */ |
| 25 | #define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) |
| 26 | #define PKMAP_SIZE PGDIR_SIZE |
| 27 | #define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT) |
| 28 | #define LAST_PKMAP_MASK (LAST_PKMAP - 1) |
| 29 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
| 30 | #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) |
| 31 | |
| 32 | #define kmap_prot PAGE_KERNEL |
| 33 | |
| 34 | |
| 35 | #include <asm/cacheflush.h> |
| 36 | |
| 37 | extern void *kmap(struct page *page); |
| 38 | extern void *kmap_high(struct page *page); |
| 39 | extern void *kmap_atomic(struct page *page); |
| 40 | extern void __kunmap_atomic(void *kvaddr); |
| 41 | extern void kunmap_high(struct page *page); |
| 42 | |
| 43 | extern void kmap_init(void); |
| 44 | |
| 45 | static inline void flush_cache_kmaps(void) |
| 46 | { |
| 47 | flush_cache_all(); |
| 48 | } |
| 49 | |
| 50 | static inline void kunmap(struct page *page) |
| 51 | { |
| 52 | BUG_ON(in_interrupt()); |
| 53 | if (!PageHighMem(page)) |
| 54 | return; |
| 55 | kunmap_high(page); |
| 56 | } |
| 57 | |
| 58 | |
| 59 | #endif |
| 60 | |
| 61 | #endif |