root/arch/powerpc/include/asm/fixmap.h

/* [<][>][^][v][top][bottom][index][help] */

INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. __set_fixmap

   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 
  14 #ifndef _ASM_FIXMAP_H
  15 #define _ASM_FIXMAP_H
  16 
  17 #ifndef __ASSEMBLY__
  18 #include <asm/page.h>
  19 #include <asm/pgtable.h>
  20 #ifdef CONFIG_HIGHMEM
  21 #include <linux/threads.h>
  22 #include <asm/kmap_types.h>
  23 #endif
  24 
  25 #ifdef CONFIG_KASAN
  26 #include <asm/kasan.h>
  27 #define FIXADDR_TOP     (KASAN_SHADOW_START - PAGE_SIZE)
  28 #else
  29 #define FIXADDR_TOP     ((unsigned long)(-PAGE_SIZE))
  30 #endif
  31 
  32 /*
  33  * Here we define all the compile-time 'special' virtual
  34  * addresses. The point is to have a constant address at
  35  * compile time, but to set the physical address only
  36  * in the boot process. We allocate these special addresses
  37  * from the end of virtual memory (0xfffff000) backwards.
  38  * Also this lets us do fail-safe vmalloc(), we
  39  * can guarantee that these special addresses and
  40  * vmalloc()-ed addresses never overlap.
  41  *
  42  * these 'compile-time allocated' memory buffers are
  43  * fixed-size 4k pages. (or larger if used with an increment
  44  * highger than 1) use fixmap_set(idx,phys) to associate
  45  * physical memory with fixmap indices.
  46  *
  47  * TLB entries of such buffers will not be flushed across
  48  * task switches.
  49  */
  50 enum fixed_addresses {
  51         FIX_HOLE,
  52         /* reserve the top 128K for early debugging purposes */
  53         FIX_EARLY_DEBUG_TOP = FIX_HOLE,
  54         FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1,
  55 #ifdef CONFIG_HIGHMEM
  56         FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
  57         FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
  58 #endif
  59 #ifdef CONFIG_PPC_8xx
  60         /* For IMMR we need an aligned 512K area */
  61 #define FIX_IMMR_SIZE   (512 * 1024 / PAGE_SIZE)
  62         FIX_IMMR_START,
  63         FIX_IMMR_BASE = __ALIGN_MASK(FIX_IMMR_START, FIX_IMMR_SIZE - 1) - 1 +
  64                        FIX_IMMR_SIZE,
  65 #endif
  66         /* FIX_PCIE_MCFG, */
  67         __end_of_fixed_addresses
  68 };
  69 
  70 #define __FIXADDR_SIZE  (__end_of_fixed_addresses << PAGE_SHIFT)
  71 #define FIXADDR_START           (FIXADDR_TOP - __FIXADDR_SIZE)
  72 
  73 #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
  74 
  75 #include <asm-generic/fixmap.h>
  76 
  77 static inline void __set_fixmap(enum fixed_addresses idx,
  78                                 phys_addr_t phys, pgprot_t flags)
  79 {
  80         if (__builtin_constant_p(idx))
  81                 BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
  82         else if (WARN_ON(idx >= __end_of_fixed_addresses))
  83                 return;
  84 
  85         map_kernel_page(__fix_to_virt(idx), phys, flags);
  86 }
  87 
  88 #endif /* !__ASSEMBLY__ */
  89 #endif

/* [<][>][^][v][top][bottom][index][help] */