44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* highmem.h: virtual kernel memory mappings for high memory
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*
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* Used in CONFIG_HIGHMEM systems for memory pages which
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* are not addressable by direct kernel virtual addresses.
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*
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* Copyright (C) 2025 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_HIGHMEM_H
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#define _ASM_HIGHMEM_H
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#ifdef __KERNEL__
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#include <asm/kmap_size.h>
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#ifndef __ASSEMBLER__
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extern pte_t *pkmap_page_table;
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#define ARCH_HAS_KMAP_FLUSH_TLB
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void kmap_flush_tlb(unsigned long addr);
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#endif /* !__ASSEMBLER__ */
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/*
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* Right now we initialize only a single pte table. It can be extended
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* easily, subsequent pte tables have to be allocated in one physical
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* chunk of RAM.
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*/
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#define LAST_PKMAP 1024
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#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
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#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
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#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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#define flush_cache_kmaps() do {} while (0)
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#define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(vaddr)
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#define arch_kmap_local_post_unmap(vaddr) local_flush_tlb_one(vaddr)
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#endif /* __KERNEL__ */
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#endif /* _ASM_HIGHMEM_H */
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