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Linux/arch/microblaze/include/asm/fixmap.h

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  1 /*
  2  * fixmap.h: compile-time virtual memory allocation
  3  *
  4  * This file is subject to the terms and conditions of the GNU General Public
  5  * License.  See the file "COPYING" in the main directory of this archive
  6  * for more details.
  7  *
  8  * Copyright (C) 1998 Ingo Molnar
  9  *
 10  * Copyright 2008 Freescale Semiconductor Inc.
 11  *   Port to powerpc added by Kumar Gala
 12  *
 13  * Copyright 2011 Michal Simek <monstr@monstr.eu>
 14  * Copyright 2011 PetaLogix Qld Pty Ltd
 15  *   Port to Microblaze
 16  */
 17 
 18 #ifndef _ASM_FIXMAP_H
 19 #define _ASM_FIXMAP_H
 20 
 21 #ifndef __ASSEMBLY__
 22 #include <linux/kernel.h>
 23 #include <asm/page.h>
 24 #ifdef CONFIG_HIGHMEM
 25 #include <linux/threads.h>
 26 #include <asm/kmap_types.h>
 27 #endif
 28 
 29 #define FIXADDR_TOP     ((unsigned long)(-PAGE_SIZE))
 30 
 31 /*
 32  * Here we define all the compile-time 'special' virtual
 33  * addresses. The point is to have a constant address at
 34  * compile time, but to set the physical address only
 35  * in the boot process. We allocate these special addresses
 36  * from the end of virtual memory (0xfffff000) backwards.
 37  * Also this lets us do fail-safe vmalloc(), we
 38  * can guarantee that these special addresses and
 39  * vmalloc()-ed addresses never overlap.
 40  *
 41  * these 'compile-time allocated' memory buffers are
 42  * fixed-size 4k pages. (or larger if used with an increment
 43  * highger than 1) use fixmap_set(idx,phys) to associate
 44  * physical memory with fixmap indices.
 45  *
 46  * TLB entries of such buffers will not be flushed across
 47  * task switches.
 48  */
 49 enum fixed_addresses {
 50         FIX_HOLE,
 51 #ifdef CONFIG_HIGHMEM
 52         FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
 53         FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * num_possible_cpus()) - 1,
 54 #endif
 55         __end_of_fixed_addresses
 56 };
 57 
 58 extern void __set_fixmap(enum fixed_addresses idx,
 59                                         phys_addr_t phys, pgprot_t flags);
 60 
 61 #define __FIXADDR_SIZE  (__end_of_fixed_addresses << PAGE_SHIFT)
 62 #define FIXADDR_START           (FIXADDR_TOP - __FIXADDR_SIZE)
 63 
 64 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_CI
 65 
 66 #include <asm-generic/fixmap.h>
 67 
 68 #endif /* !__ASSEMBLY__ */
 69 #endif
 70 

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