1d2912cb1SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 245890f6dSVineet Gupta /* 345890f6dSVineet Gupta * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) 445890f6dSVineet Gupta */ 545890f6dSVineet Gupta 645890f6dSVineet Gupta #ifndef _ASM_HIGHMEM_H 745890f6dSVineet Gupta #define _ASM_HIGHMEM_H 845890f6dSVineet Gupta 945890f6dSVineet Gupta #ifdef CONFIG_HIGHMEM 1045890f6dSVineet Gupta 1145890f6dSVineet Gupta #include <uapi/asm/page.h> 1245890f6dSVineet Gupta #include <asm/kmap_types.h> 1345890f6dSVineet Gupta 1445890f6dSVineet Gupta /* start after vmalloc area */ 1545890f6dSVineet Gupta #define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) 1645890f6dSVineet Gupta #define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ 1745890f6dSVineet Gupta #define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) 1845890f6dSVineet Gupta #define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) 1945890f6dSVineet Gupta 2045890f6dSVineet Gupta /* start after fixmap area */ 2145890f6dSVineet Gupta #define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) 2245890f6dSVineet Gupta #define PKMAP_SIZE PGDIR_SIZE 2345890f6dSVineet Gupta #define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT) 2445890f6dSVineet Gupta #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 2545890f6dSVineet Gupta #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 2645890f6dSVineet Gupta #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) 2745890f6dSVineet Gupta 2845890f6dSVineet Gupta #define kmap_prot PAGE_KERNEL 2945890f6dSVineet Gupta 3045890f6dSVineet Gupta 3145890f6dSVineet Gupta #include <asm/cacheflush.h> 3245890f6dSVineet Gupta 3345890f6dSVineet Gupta extern void *kmap(struct page *page); 3445890f6dSVineet Gupta extern void *kmap_high(struct page *page); 3545890f6dSVineet Gupta extern void *kmap_atomic(struct page *page); 3645890f6dSVineet Gupta extern void __kunmap_atomic(void *kvaddr); 3745890f6dSVineet Gupta extern void kunmap_high(struct page *page); 3845890f6dSVineet Gupta 3945890f6dSVineet Gupta extern void kmap_init(void); 4045890f6dSVineet Gupta 4145890f6dSVineet Gupta static inline void flush_cache_kmaps(void) 4245890f6dSVineet Gupta { 4345890f6dSVineet Gupta flush_cache_all(); 4445890f6dSVineet Gupta } 4545890f6dSVineet Gupta 4645890f6dSVineet Gupta static inline void kunmap(struct page *page) 4745890f6dSVineet Gupta { 4845890f6dSVineet Gupta BUG_ON(in_interrupt()); 4945890f6dSVineet Gupta if (!PageHighMem(page)) 5045890f6dSVineet Gupta return; 5145890f6dSVineet Gupta kunmap_high(page); 5245890f6dSVineet Gupta } 5345890f6dSVineet Gupta 5445890f6dSVineet Gupta 5545890f6dSVineet Gupta #endif 5645890f6dSVineet Gupta 5745890f6dSVineet Gupta #endif 58