| /* SPDX-License-Identifier: GPL-2.0 */ |
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| |
| #ifndef __ASM_CSKY_HIGHMEM_H |
| #define __ASM_CSKY_HIGHMEM_H |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/uaccess.h> |
| #include <asm/kmap_size.h> |
| #include <asm/cache.h> |
| |
| /* undef for production */ |
| #define HIGHMEM_DEBUG 1 |
| |
| /* declarations for highmem.c */ |
| extern unsigned long highstart_pfn, highend_pfn; |
| |
| extern pte_t *pkmap_page_table; |
| |
| /* |
| * Right now we initialize only a single pte table. It can be extended |
| * easily, subsequent pte tables have to be allocated in one physical |
| * chunk of RAM. |
| */ |
| #define LAST_PKMAP 1024 |
| #define LAST_PKMAP_MASK (LAST_PKMAP-1) |
| #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) |
| #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
| |
| #define ARCH_HAS_KMAP_FLUSH_TLB |
| extern void kmap_flush_tlb(unsigned long addr); |
| |
| #define flush_cache_kmaps() do {} while (0) |
| |
| #define arch_kmap_local_post_map(vaddr, pteval) kmap_flush_tlb(vaddr) |
| #define arch_kmap_local_post_unmap(vaddr) kmap_flush_tlb(vaddr) |
| |
| extern void kmap_init(void); |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* __ASM_CSKY_HIGHMEM_H */ |
