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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.  * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
  11.  * x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
  12.  */
  13.  
  14. #ifndef _ASM_X86_FIXMAP_H
  15. #define _ASM_X86_FIXMAP_H
  16.  
  17. #ifndef __ASSEMBLY__
  18. #include <linux/kernel.h>
  19. #include <asm/acpi.h>
  20. #include <asm/apicdef.h>
  21. #include <asm/page.h>
  22. #ifdef CONFIG_X86_32
  23. #include <linux/threads.h>
  24. #include <asm/kmap_types.h>
  25. #else
  26. #include <uapi/asm/vsyscall.h>
  27. #endif
  28.  
  29. /*
  30.  * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
  31.  * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
  32.  * Because of this, FIXADDR_TOP x86 integration was left as later work.
  33.  */
  34. #ifdef CONFIG_X86_32
  35. /* used by vmalloc.c, vsyscall.lds.S.
  36.  *
  37.  * Leave one empty page between vmalloc'ed areas and
  38.  * the start of the fixmap.
  39.  */
  40. extern unsigned long __FIXADDR_TOP;
  41. #define FIXADDR_TOP     ((unsigned long)__FIXADDR_TOP)
  42. #else
  43. #define FIXADDR_TOP     (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
  44.                          PAGE_SIZE)
  45. #endif
  46.  
  47.  
  48. /*
  49.  * Here we define all the compile-time 'special' virtual
  50.  * addresses. The point is to have a constant address at
  51.  * compile time, but to set the physical address only
  52.  * in the boot process.
  53.  * for x86_32: We allocate these special addresses
  54.  * from the end of virtual memory (0xfffff000) backwards.
  55.  * Also this lets us do fail-safe vmalloc(), we
  56.  * can guarantee that these special addresses and
  57.  * vmalloc()-ed addresses never overlap.
  58.  *
  59.  * These 'compile-time allocated' memory buffers are
  60.  * fixed-size 4k pages (or larger if used with an increment
  61.  * higher than 1). Use set_fixmap(idx,phys) to associate
  62.  * physical memory with fixmap indices.
  63.  *
  64.  * TLB entries of such buffers will not be flushed across
  65.  * task switches.
  66.  */
  67. enum fixed_addresses {
  68. #ifdef CONFIG_X86_32
  69.         FIX_HOLE,
  70. #else
  71. #ifdef CONFIG_X86_VSYSCALL_EMULATION
  72.         VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
  73. #endif
  74. #endif
  75.         FIX_DBGP_BASE,
  76.         FIX_EARLYCON_MEM_BASE,
  77. #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
  78.         FIX_OHCI1394_BASE,
  79. #endif
  80. #ifdef CONFIG_X86_LOCAL_APIC
  81.         FIX_APIC_BASE,  /* local (CPU) APIC) -- required for SMP or not */
  82. #endif
  83. #ifdef CONFIG_X86_IO_APIC
  84.         FIX_IO_APIC_BASE_0,
  85.         FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
  86. #endif
  87.         FIX_RO_IDT,     /* Virtual mapping for read-only IDT */
  88. #ifdef CONFIG_X86_32
  89.         FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
  90.         FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
  91. #ifdef CONFIG_PCI_MMCONFIG
  92.         FIX_PCIE_MCFG,
  93. #endif
  94. #endif
  95. #ifdef CONFIG_PARAVIRT
  96.         FIX_PARAVIRT_BOOTMAP,
  97. #endif
  98.         FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
  99.         FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
  100. #ifdef  CONFIG_X86_INTEL_MID
  101.         FIX_LNW_VRTC,
  102. #endif
  103.         __end_of_permanent_fixed_addresses,
  104.  
  105.         /*
  106.          * 512 temporary boot-time mappings, used by early_ioremap(),
  107.          * before ioremap() is functional.
  108.          *
  109.          * If necessary we round it up to the next 512 pages boundary so
  110.          * that we can have a single pgd entry and a single pte table:
  111.          */
  112. #define NR_FIX_BTMAPS           64
  113. #define FIX_BTMAPS_SLOTS        8
  114. #define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
  115.         FIX_BTMAP_END =
  116.          (__end_of_permanent_fixed_addresses ^
  117.           (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
  118.          -PTRS_PER_PTE
  119.          ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
  120.            (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
  121.          : __end_of_permanent_fixed_addresses,
  122.         FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
  123. #ifdef CONFIG_X86_32
  124.         FIX_WP_TEST,
  125. #endif
  126. #ifdef CONFIG_INTEL_TXT
  127.         FIX_TBOOT_BASE,
  128. #endif
  129.         __end_of_fixed_addresses
  130. };
  131.  
  132.  
  133. extern void reserve_top_address(unsigned long reserve);
  134.  
  135. #define FIXADDR_SIZE    (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
  136. #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
  137.  
  138. extern int fixmaps_set;
  139.  
  140. extern pte_t *kmap_pte;
  141. #define kmap_prot PAGE_KERNEL
  142. extern pte_t *pkmap_page_table;
  143.  
  144. void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
  145. void native_set_fixmap(enum fixed_addresses idx,
  146.                        phys_addr_t phys, pgprot_t flags);
  147.  
  148. #ifndef CONFIG_PARAVIRT
  149. static inline void __set_fixmap(enum fixed_addresses idx,
  150.                                 phys_addr_t phys, pgprot_t flags)
  151. {
  152.         native_set_fixmap(idx, phys, flags);
  153. }
  154. #endif
  155.  
  156. #include <asm-generic/fixmap.h>
  157.  
  158. #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
  159. #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
  160.  
  161. void __early_set_fixmap(enum fixed_addresses idx,
  162.                         phys_addr_t phys, pgprot_t flags);
  163.  
  164. #endif /* !__ASSEMBLY__ */
  165. #endif /* _ASM_X86_FIXMAP_H */
  166.