1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com) 4 */ 5 6 #ifndef _ASM_HIGHMEM_H 7 #define _ASM_HIGHMEM_H 8 9 #ifdef CONFIG_HIGHMEM 10 11 #include <uapi/asm/page.h> 12 #include <asm/kmap_size.h> 13 14 #define FIXMAP_SIZE PGDIR_SIZE 15 #define PKMAP_SIZE PGDIR_SIZE 16 17 /* start after vmalloc area */ 18 #define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE) 19 20 #define FIX_KMAP_SLOTS (KM_MAX_IDX * NR_CPUS) 21 #define FIX_KMAP_BEGIN (0UL) 22 #define FIX_KMAP_END ((FIX_KMAP_BEGIN + FIX_KMAP_SLOTS) - 1) 23 24 #define FIXADDR_TOP (FIXMAP_BASE + (FIX_KMAP_END << PAGE_SHIFT)) 25 26 /* 27 * This should be converted to the asm-generic version, but of course this 28 * is needlessly different from all other architectures. Sigh - tglx 29 */ 30 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) 31 #define __virt_to_fix(x) (((FIXADDR_TOP - ((x) & PAGE_MASK))) >> PAGE_SHIFT) 32 33 /* start after fixmap area */ 34 #define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE) 35 #define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT) 36 #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 37 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 38 #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) 39 40 #include <asm/cacheflush.h> 41 42 extern void kmap_init(void); 43 44 #define arch_kmap_local_post_unmap(vaddr) \ 45 local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE) 46 flush_cache_kmaps(void)47static inline void flush_cache_kmaps(void) 48 { 49 flush_cache_all(); 50 } 51 #endif 52 53 #endif 54