1 /* SPDX-License-Identifier: GPL-2.0 */ 1 2 /* 3 * highmem.h: virtual kernel memory mappings f 4 * 5 * PowerPC version, stolen from the i386 versi 6 * 7 * Used in CONFIG_HIGHMEM systems for memory p 8 * are not addressable by direct kernel virtua 9 * 10 * Copyright (C) 1999 Gerhard Wichert, Siemens 11 * Gerhard.Wichert@pdb.siem 12 * 13 * 14 * Redesigned the x86 32-bit VM architecture t 15 * up to 16 Terrabyte physical memory. With cu 16 * we now support up to 64 Gigabytes physical 17 * 18 * Copyright (C) 1999 Ingo Molnar <mingo@redha 19 */ 20 21 #ifndef _ASM_HIGHMEM_H 22 #define _ASM_HIGHMEM_H 23 24 #ifdef __KERNEL__ 25 26 #include <linux/interrupt.h> 27 #include <asm/cacheflush.h> 28 #include <asm/page.h> 29 #include <asm/fixmap.h> 30 31 extern pte_t *pkmap_page_table; 32 33 /* 34 * Right now we initialize only a single pte t 35 * easily, subsequent pte tables have to be al 36 * chunk of RAM. 37 */ 38 /* 39 * We use one full pte table with 4K pages. An 40 * table covers enough memory (32MB/512MB/2GB 41 * and PKMAP can be placed in a single pte tab 42 * in case of 16K/64K/256K page sizes. 43 */ 44 #ifdef CONFIG_PPC_4K_PAGES 45 #define PKMAP_ORDER PTE_SHIFT 46 #else 47 #define PKMAP_ORDER 9 48 #endif 49 #define LAST_PKMAP (1 << PKMAP_ORDER) 50 #ifndef CONFIG_PPC_4K_PAGES 51 #define PKMAP_BASE (FIXADDR_START - PAGE_ 52 #else 53 #define PKMAP_BASE ((FIXADDR_START - PAGE 54 #endif 55 #define LAST_PKMAP_MASK (LAST_PKMAP-1) 56 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> 57 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << 58 59 #define flush_cache_kmaps() flush_cache_al 60 61 #define arch_kmap_local_set_pte(mm, vaddr, pte 62 __set_pte_at(mm, vaddr, ptep, ptev, 1) 63 #define arch_kmap_local_post_map(vaddr, pteval 64 local_flush_tlb_page(NULL, vaddr) 65 #define arch_kmap_local_post_unmap(vaddr) 66 local_flush_tlb_page(NULL, vaddr) 67 68 #endif /* __KERNEL__ */ 69 70 #endif /* _ASM_HIGHMEM_H */ 71
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