/* SPDX-License-Identifier: GPL-2.0 */ /* * highmem.h: virtual kernel memory mappings for high memory * * Used in CONFIG_HIGHMEM systems for memory pages which * are not addressable by direct kernel virtual addresses. * * Copyright (C) 2025 Loongson Technology Corporation Limited */ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H #ifdef __KERNEL__ #include <asm/kmap_size.h> #ifndef __ASSEMBLER__ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB void kmap_flush_tlb(unsigned long addr); #endif /* !__ASSEMBLER__ */ /* * 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 flush_cache_kmaps() do {} while (0) #define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(vaddr) #define arch_kmap_local_post_unmap(vaddr) local_flush_tlb_one(vaddr) #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */