145890f6dSVineet Gupta /* 245890f6dSVineet Gupta * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) 345890f6dSVineet Gupta * 445890f6dSVineet Gupta * This program is free software; you can redistribute it and/or modify 545890f6dSVineet Gupta * it under the terms of the GNU General Public License version 2 as 645890f6dSVineet Gupta * published by the Free Software Foundation. 745890f6dSVineet Gupta * 845890f6dSVineet Gupta */ 945890f6dSVineet Gupta 1045890f6dSVineet Gupta #ifndef _ASM_HIGHMEM_H 1145890f6dSVineet Gupta #define _ASM_HIGHMEM_H 1245890f6dSVineet Gupta 1345890f6dSVineet Gupta #ifdef CONFIG_HIGHMEM 1445890f6dSVineet Gupta 1545890f6dSVineet Gupta #include <uapi/asm/page.h> 1645890f6dSVineet Gupta #include <asm/kmap_types.h> 1745890f6dSVineet Gupta 1845890f6dSVineet Gupta /* start after vmalloc area */ 1945890f6dSVineet Gupta #define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) 2045890f6dSVineet Gupta #define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ 2145890f6dSVineet Gupta #define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) 2245890f6dSVineet Gupta #define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) 2345890f6dSVineet Gupta 2445890f6dSVineet Gupta /* start after fixmap area */ 2545890f6dSVineet Gupta #define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) 2645890f6dSVineet Gupta #define PKMAP_SIZE PGDIR_SIZE 2745890f6dSVineet Gupta #define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT) 2845890f6dSVineet Gupta #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 2945890f6dSVineet Gupta #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 3045890f6dSVineet Gupta #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) 3145890f6dSVineet Gupta 3245890f6dSVineet Gupta #define kmap_prot PAGE_KERNEL 3345890f6dSVineet Gupta 3445890f6dSVineet Gupta 3545890f6dSVineet Gupta #include <asm/cacheflush.h> 3645890f6dSVineet Gupta 3745890f6dSVineet Gupta extern void *kmap(struct page *page); 3845890f6dSVineet Gupta extern void *kmap_high(struct page *page); 3945890f6dSVineet Gupta extern void *kmap_atomic(struct page *page); 4045890f6dSVineet Gupta extern void __kunmap_atomic(void *kvaddr); 4145890f6dSVineet Gupta extern void kunmap_high(struct page *page); 4245890f6dSVineet Gupta 4345890f6dSVineet Gupta extern void kmap_init(void); 4445890f6dSVineet Gupta 4545890f6dSVineet Gupta static inline void flush_cache_kmaps(void) 4645890f6dSVineet Gupta { 4745890f6dSVineet Gupta flush_cache_all(); 4845890f6dSVineet Gupta } 4945890f6dSVineet Gupta 5045890f6dSVineet Gupta static inline void kunmap(struct page *page) 5145890f6dSVineet Gupta { 5245890f6dSVineet Gupta BUG_ON(in_interrupt()); 5345890f6dSVineet Gupta if (!PageHighMem(page)) 5445890f6dSVineet Gupta return; 5545890f6dSVineet Gupta kunmap_high(page); 5645890f6dSVineet Gupta } 5745890f6dSVineet Gupta 5845890f6dSVineet Gupta 5945890f6dSVineet Gupta #endif 6045890f6dSVineet Gupta 6145890f6dSVineet Gupta #endif 62