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70 lines
2.0 KiB
70 lines
2.0 KiB
/* 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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* PowerPC version, stolen from the i386 version. |
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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) 1999 Gerhard Wichert, Siemens AG |
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* [email protected] |
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* |
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* |
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* Redesigned the x86 32-bit VM architecture to deal with |
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* up to 16 Terrabyte physical memory. With current x86 CPUs |
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* we now support up to 64 Gigabytes physical RAM. |
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* |
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* Copyright (C) 1999 Ingo Molnar <[email protected]> |
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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 <linux/interrupt.h> |
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#include <asm/cacheflush.h> |
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#include <asm/page.h> |
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#include <asm/fixmap.h> |
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extern pte_t *pkmap_page_table; |
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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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/* |
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* We use one full pte table with 4K pages. And with 16K/64K/256K pages pte |
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* table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP |
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* and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP |
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* in case of 16K/64K/256K page sizes. |
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*/ |
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#ifdef CONFIG_PPC_4K_PAGES |
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#define PKMAP_ORDER PTE_SHIFT |
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#else |
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#define PKMAP_ORDER 9 |
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#endif |
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#define LAST_PKMAP (1 << PKMAP_ORDER) |
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#ifndef CONFIG_PPC_4K_PAGES |
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#define PKMAP_BASE (FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) |
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#else |
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#define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK) |
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#endif |
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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() flush_cache_all() |
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#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev) \ |
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__set_pte_at(mm, vaddr, ptep, ptev, 1) |
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#define arch_kmap_local_post_map(vaddr, pteval) \ |
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local_flush_tlb_page(NULL, vaddr) |
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#define arch_kmap_local_post_unmap(vaddr) \ |
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local_flush_tlb_page(NULL, vaddr) |
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#endif /* __KERNEL__ */ |
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#endif /* _ASM_HIGHMEM_H */
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