/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) */ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H #ifdef CONFIG_HIGHMEM #include <uapi/asm/page.h> #include <asm/kmap_types.h> /* start after vmalloc area */ #define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) #define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ #define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) #define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) /* start after fixmap area */ #define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) #define PKMAP_SIZE PGDIR_SIZE #define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT) #define LAST_PKMAP_MASK (LAST_PKMAP - 1) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) #define kmap_prot PAGE_KERNEL #include <asm/cacheflush.h> extern void *kmap(struct page *page); extern void *kmap_high(struct page *page); extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void kunmap_high(struct page *page); extern void kmap_init(void); static inline void flush_cache_kmaps(void) { flush_cache_all(); } static inline void kunmap(struct page *page) { BUG_ON(in_interrupt()); if (!PageHighMem(page)) return; kunmap_high(page); } #endif #endif