1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun #ifndef __ASM_CSKY_HIGHMEM_H 5*4882a593Smuzhiyun #define __ASM_CSKY_HIGHMEM_H 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifdef __KERNEL__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/init.h> 10*4882a593Smuzhiyun #include <linux/interrupt.h> 11*4882a593Smuzhiyun #include <linux/uaccess.h> 12*4882a593Smuzhiyun #include <asm/kmap_types.h> 13*4882a593Smuzhiyun #include <asm/cache.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /* undef for production */ 16*4882a593Smuzhiyun #define HIGHMEM_DEBUG 1 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun /* declarations for highmem.c */ 19*4882a593Smuzhiyun extern unsigned long highstart_pfn, highend_pfn; 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun extern pte_t *pkmap_page_table; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun /* 24*4882a593Smuzhiyun * Right now we initialize only a single pte table. It can be extended 25*4882a593Smuzhiyun * easily, subsequent pte tables have to be allocated in one physical 26*4882a593Smuzhiyun * chunk of RAM. 27*4882a593Smuzhiyun */ 28*4882a593Smuzhiyun #define LAST_PKMAP 1024 29*4882a593Smuzhiyun #define LAST_PKMAP_MASK (LAST_PKMAP-1) 30*4882a593Smuzhiyun #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) 31*4882a593Smuzhiyun #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun #define ARCH_HAS_KMAP_FLUSH_TLB 34*4882a593Smuzhiyun extern void kmap_flush_tlb(unsigned long addr); 35*4882a593Smuzhiyun extern void *kmap_atomic_pfn(unsigned long pfn); 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun #define flush_cache_kmaps() do {} while (0) 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun extern void kmap_init(void); 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun #endif /* __KERNEL__ */ 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun #endif /* __ASM_CSKY_HIGHMEM_H */ 44