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Linux/arch/powerpc/include/asm/highmem.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * highmem.h: virtual kernel memory mappings for high memory
  4  *
  5  * PowerPC version, stolen from the i386 version.
  6  *
  7  * Used in CONFIG_HIGHMEM systems for memory pages which
  8  * are not addressable by direct kernel virtual addresses.
  9  *
 10  * Copyright (C) 1999 Gerhard Wichert, Siemens AG
 11  *                    Gerhard.Wichert@pdb.siemens.de
 12  *
 13  *
 14  * Redesigned the x86 32-bit VM architecture to deal with
 15  * up to 16 Terrabyte physical memory. With current x86 CPUs
 16  * we now support up to 64 Gigabytes physical RAM.
 17  *
 18  * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
 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/kmap_types.h>
 28 #include <asm/cacheflush.h>
 29 #include <asm/page.h>
 30 #include <asm/fixmap.h>
 31 
 32 extern pte_t *kmap_pte;
 33 extern pgprot_t kmap_prot;
 34 extern pte_t *pkmap_page_table;
 35 
 36 /*
 37  * Right now we initialize only a single pte table. It can be extended
 38  * easily, subsequent pte tables have to be allocated in one physical
 39  * chunk of RAM.
 40  */
 41 /*
 42  * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
 43  * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
 44  * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
 45  * in case of 16K/64K/256K page sizes.
 46  */
 47 #ifdef CONFIG_PPC_4K_PAGES
 48 #define PKMAP_ORDER     PTE_SHIFT
 49 #else
 50 #define PKMAP_ORDER     9
 51 #endif
 52 #define LAST_PKMAP      (1 << PKMAP_ORDER)
 53 #ifndef CONFIG_PPC_4K_PAGES
 54 #define PKMAP_BASE      (FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1))
 55 #else
 56 #define PKMAP_BASE      ((FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK)
 57 #endif
 58 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
 59 #define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
 60 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 61 
 62 extern void *kmap_high(struct page *page);
 63 extern void kunmap_high(struct page *page);
 64 extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
 65 extern void __kunmap_atomic(void *kvaddr);
 66 
 67 static inline void *kmap(struct page *page)
 68 {
 69         might_sleep();
 70         if (!PageHighMem(page))
 71                 return page_address(page);
 72         return kmap_high(page);
 73 }
 74 
 75 static inline void kunmap(struct page *page)
 76 {
 77         BUG_ON(in_interrupt());
 78         if (!PageHighMem(page))
 79                 return;
 80         kunmap_high(page);
 81 }
 82 
 83 static inline void *kmap_atomic(struct page *page)
 84 {
 85         return kmap_atomic_prot(page, kmap_prot);
 86 }
 87 
 88 
 89 #define flush_cache_kmaps()     flush_cache_all()
 90 
 91 #endif /* __KERNEL__ */
 92 
 93 #endif /* _ASM_HIGHMEM_H */
 94 

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