1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun // Copyright (C) 2005-2017 Andes Technology Corporation 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun #ifndef _ASM_HIGHMEM_H 5*4882a593Smuzhiyun #define _ASM_HIGHMEM_H 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <asm/proc-fns.h> 8*4882a593Smuzhiyun #include <asm/kmap_types.h> 9*4882a593Smuzhiyun #include <asm/fixmap.h> 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun /* 12*4882a593Smuzhiyun * Right now we initialize only a single pte table. It can be extended 13*4882a593Smuzhiyun * easily, subsequent pte tables have to be allocated in one physical 14*4882a593Smuzhiyun * chunk of RAM. 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun /* 17*4882a593Smuzhiyun * Ordering is (from lower to higher memory addresses): 18*4882a593Smuzhiyun * 19*4882a593Smuzhiyun * high_memory 20*4882a593Smuzhiyun * Persistent kmap area 21*4882a593Smuzhiyun * PKMAP_BASE 22*4882a593Smuzhiyun * fixed_addresses 23*4882a593Smuzhiyun * FIXADDR_START 24*4882a593Smuzhiyun * FIXADDR_TOP 25*4882a593Smuzhiyun * Vmalloc area 26*4882a593Smuzhiyun * VMALLOC_START 27*4882a593Smuzhiyun * VMALLOC_END 28*4882a593Smuzhiyun */ 29*4882a593Smuzhiyun #define PKMAP_BASE ((FIXADDR_START - PGDIR_SIZE) & (PGDIR_MASK)) 30*4882a593Smuzhiyun #define LAST_PKMAP PTRS_PER_PTE 31*4882a593Smuzhiyun #define LAST_PKMAP_MASK (LAST_PKMAP - 1) 32*4882a593Smuzhiyun #define PKMAP_NR(virt) (((virt) - (PKMAP_BASE)) >> PAGE_SHIFT) 33*4882a593Smuzhiyun #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 34*4882a593Smuzhiyun flush_cache_kmaps(void)35*4882a593Smuzhiyunstatic inline void flush_cache_kmaps(void) 36*4882a593Smuzhiyun { 37*4882a593Smuzhiyun cpu_dcache_wbinval_all(); 38*4882a593Smuzhiyun } 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun /* declarations for highmem.c */ 41*4882a593Smuzhiyun extern unsigned long highstart_pfn, highend_pfn; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun extern pte_t *pkmap_page_table; 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun extern void kmap_init(void); 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun /* 48*4882a593Smuzhiyun * The following functions are already defined by <linux/highmem.h> 49*4882a593Smuzhiyun * when CONFIG_HIGHMEM is not set. 50*4882a593Smuzhiyun */ 51*4882a593Smuzhiyun #ifdef CONFIG_HIGHMEM 52*4882a593Smuzhiyun extern void *kmap_atomic_pfn(unsigned long pfn); 53*4882a593Smuzhiyun #endif 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun #endif 56