arch/arm/include/asm/fixmap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_FIXMAP_H
   3 #define _ASM_FIXMAP_H
   4
   5 #define FIXADDR_START           0xffc80000UL
   6 #define FIXADDR_END             0xfff00000UL
   7 #define FIXADDR_TOP             (FIXADDR_END - PAGE_SIZE)
   8
   9 #include <linux/pgtable.h>
  10 #include <asm/kmap_size.h>
  11
  12 enum fixed_addresses {
  13         FIX_EARLYCON_MEM_BASE,
  14         __end_of_permanent_fixed_addresses,
  15
  16         FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses,
  17         FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
  18
  19         /* Support writing RO kernel text via kprobes, jump labels, etc. */
  20         FIX_TEXT_POKE0,
  21         FIX_TEXT_POKE1,
  22
  23         __end_of_fixmap_region,
  24
  25         /*
  26          * Share the kmap() region with early_ioremap(): this is guaranteed
  27          * not to clash since early_ioremap() is only available before
  28          * paging_init(), and kmap() only after.
  29          */
  30 #define NR_FIX_BTMAPS           32
  31 #define FIX_BTMAPS_SLOTS        7
  32 #define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
  33
  34         FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
  35         FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
  36         __end_of_early_ioremap_region
  37 };
  38
  39 static const enum fixed_addresses __end_of_fixed_addresses =
  40         __end_of_fixmap_region > __end_of_early_ioremap_region ?
  41         __end_of_fixmap_region : __end_of_early_ioremap_region;
  42
  43 #define FIXMAP_PAGE_COMMON      (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY)
  44
  45 #define FIXMAP_PAGE_NORMAL      (pgprot_kernel | L_PTE_XN)
  46 #define FIXMAP_PAGE_RO          (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
  47
  48 /* Used by set_fixmap_(io|nocache), both meant for mapping a device */
  49 #define FIXMAP_PAGE_IO          (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED)
  50 #define FIXMAP_PAGE_NOCACHE     FIXMAP_PAGE_IO
  51
  52 #define __early_set_fixmap      __set_fixmap
  53
  54 #ifdef CONFIG_MMU
  55
  56 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
  57 void __init early_fixmap_init(void);
  58
  59 #include <asm-generic/fixmap.h>
  60
  61 #else
  62
  63 static inline void early_fixmap_init(void) { }
  64
  65 #endif
  66 #endif