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
  11 enum 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
  38 static 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      (pgprot_kernel | L_PTE_XN)
  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
  55 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
  56 void __init early_fixmap_init(void);
  57
  58 #include <asm-generic/fixmap.h>
  59
  60 #else
  61
  62 static inline void early_fixmap_init(void) { }
  63
  64 #endif
  65 #endif