LXR linux/arch/arm/include/asm/fixmap.h

   1#ifndef _ASM_FIXMAP_H
   2#define _ASM_FIXMAP_H
   3
   4#define FIXADDR_START           0xffc00000UL
   5#define FIXADDR_END             0xfff00000UL
   6#define FIXADDR_TOP             (FIXADDR_END - PAGE_SIZE)
   7
   8#include <asm/kmap_types.h>
   9#include <asm/pgtable.h>
  10
  11enum fixed_addresses {
  12        FIX_EARLYCON_MEM_BASE,
  13        __end_of_permanent_fixed_addresses,
  14
  15        FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses,
  16        FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
  17
  18        /* Support writing RO kernel text via kprobes, jump labels, etc. */
  19        FIX_TEXT_POKE0,
  20        FIX_TEXT_POKE1,
  21
  22        __end_of_fixmap_region,
  23
  24        /*
  25         * Share the kmap() region with early_ioremap(): this is guaranteed
  26         * not to clash since early_ioremap() is only available before
  27         * paging_init(), and kmap() only after.
  28         */
  29#define NR_FIX_BTMAPS           32
  30#define FIX_BTMAPS_SLOTS        7
  31#define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
  32
  33        FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
  34        FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
  35        __end_of_early_ioremap_region
  36};
  37
  38static const enum fixed_addresses __end_of_fixed_addresses =
  39        __end_of_fixmap_region > __end_of_early_ioremap_region ?
  40        __end_of_fixmap_region : __end_of_early_ioremap_region;
  41
  42#define FIXMAP_PAGE_COMMON      (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY)
  43
  44#define FIXMAP_PAGE_NORMAL      (FIXMAP_PAGE_COMMON | L_PTE_MT_WRITEBACK)
  45#define FIXMAP_PAGE_RO          (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
  46
  47/* Used by set_fixmap_(io|nocache), both meant for mapping a device */
  48#define FIXMAP_PAGE_IO          (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED)
  49#define FIXMAP_PAGE_NOCACHE     FIXMAP_PAGE_IO
  50
  51#define __early_set_fixmap      __set_fixmap
  52
  53#ifdef CONFIG_MMU
  54
  55void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
  56void __init early_fixmap_init(void);
  57
  58#include <asm-generic/fixmap.h>
  59
  60#else
  61
  62static inline void early_fixmap_init(void) { }
  63
  64#endif
  65#endif
  66