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/* 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 */
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