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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. #include <asm/pvclock.h>
  23. #ifdef CONFIG_X86_32
  24. #include <linux/threads.h>
  25. #include <asm/kmap_types.h>
  26. #else
  27. #include <uapi/asm/vsyscall.h>
  28. #endif
  29.  
  30. /*
  31.  * We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
  32.  * uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
  33.  * Because of this, FIXADDR_TOP x86 integration was left as later work.
  34.  */
  35. #ifdef CONFIG_X86_32
  36. /* used by vmalloc.c, vsyscall.lds.S.
  37.  *
  38.  * Leave one empty page between vmalloc'ed areas and
  39.  * the start of the fixmap.
  40.  */
  41. extern unsigned long __FIXADDR_TOP;
  42. #define FIXADDR_TOP     ((unsigned long)__FIXADDR_TOP)
  43. #else
  44. #define FIXADDR_TOP     (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
  45.                          PAGE_SIZE)
  46. #endif
  47.  
  48.  
  49. /*
  50.  * Here we define all the compile-time 'special' virtual
  51.  * addresses. The point is to have a constant address at
  52.  * compile time, but to set the physical address only
  53.  * in the boot process.
  54.  * for x86_32: We allocate these special addresses
  55.  * from the end of virtual memory (0xfffff000) backwards.
  56.  * Also this lets us do fail-safe vmalloc(), we
  57.  * can guarantee that these special addresses and
  58.  * vmalloc()-ed addresses never overlap.
  59.  *
  60.  * These 'compile-time allocated' memory buffers are
  61.  * fixed-size 4k pages (or larger if used with an increment
  62.  * higher than 1). Use set_fixmap(idx,phys) to associate
  63.  * physical memory with fixmap indices.
  64.  *
  65.  * TLB entries of such buffers will not be flushed across
  66.  * task switches.
  67.  */
  68. enum fixed_addresses {
  69. #ifdef CONFIG_X86_32
  70.         FIX_HOLE,
  71. #else
  72. #ifdef CONFIG_X86_VSYSCALL_EMULATION
  73.         VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
  74. #endif
  75. #ifdef CONFIG_PARAVIRT_CLOCK
  76.         PVCLOCK_FIXMAP_BEGIN,
  77.         PVCLOCK_FIXMAP_END = PVCLOCK_FIXMAP_BEGIN+PVCLOCK_VSYSCALL_NR_PAGES-1,
  78. #endif
  79. #endif
  80.         FIX_DBGP_BASE,
  81.         FIX_EARLYCON_MEM_BASE,
  82. #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
  83.         FIX_OHCI1394_BASE,
  84. #endif
  85. #ifdef CONFIG_X86_LOCAL_APIC
  86.         FIX_APIC_BASE,  /* local (CPU) APIC) -- required for SMP or not */
  87. #endif
  88. #ifdef CONFIG_X86_IO_APIC
  89.         FIX_IO_APIC_BASE_0,
  90.         FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
  91. #endif
  92.         FIX_RO_IDT,     /* Virtual mapping for read-only IDT */
  93. #ifdef CONFIG_X86_32
  94.         FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
  95.         FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
  96. #ifdef CONFIG_PCI_MMCONFIG
  97.         FIX_PCIE_MCFG,
  98. #endif
  99. #endif
  100. #ifdef CONFIG_PARAVIRT
  101.         FIX_PARAVIRT_BOOTMAP,
  102. #endif
  103.         FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
  104.         FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
  105. #ifdef  CONFIG_X86_INTEL_MID
  106.         FIX_LNW_VRTC,
  107. #endif
  108.         __end_of_permanent_fixed_addresses,
  109.  
  110.         /*
  111.          * 512 temporary boot-time mappings, used by early_ioremap(),
  112.          * before ioremap() is functional.
  113.          *
  114.          * If necessary we round it up to the next 512 pages boundary so
  115.          * that we can have a single pgd entry and a single pte table:
  116.          */
  117. #define NR_FIX_BTMAPS           64
  118. #define FIX_BTMAPS_SLOTS        8
  119. #define TOTAL_FIX_BTMAPS        (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
  120.         FIX_BTMAP_END =
  121.          (__end_of_permanent_fixed_addresses ^
  122.           (__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
  123.          -PTRS_PER_PTE
  124.          ? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
  125.            (__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
  126.          : __end_of_permanent_fixed_addresses,
  127.         FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
  128. #ifdef CONFIG_X86_32
  129.         FIX_WP_TEST,
  130. #endif
  131. #ifdef CONFIG_INTEL_TXT
  132.         FIX_TBOOT_BASE,
  133. #endif
  134.         __end_of_fixed_addresses
  135. };
  136.  
  137.  
  138. extern void reserve_top_address(unsigned long reserve);
  139.  
  140. #define FIXADDR_SIZE    (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
  141. #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
  142.  
  143. extern int fixmaps_set;
  144.  
  145. extern pte_t *kmap_pte;
  146. extern pgprot_t kmap_prot;
  147. extern pte_t *pkmap_page_table;
  148.  
  149. void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
  150. void native_set_fixmap(enum fixed_addresses idx,
  151.                        phys_addr_t phys, pgprot_t flags);
  152.  
  153. #ifndef CONFIG_PARAVIRT
  154. static inline void __set_fixmap(enum fixed_addresses idx,
  155.                                 phys_addr_t phys, pgprot_t flags)
  156. {
  157.         native_set_fixmap(idx, phys, flags);
  158. }
  159. #endif
  160.  
  161. #include <asm-generic/fixmap.h>
  162.  
  163. #define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
  164. #define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
  165.  
  166. void __early_set_fixmap(enum fixed_addresses idx,
  167.                         phys_addr_t phys, pgprot_t flags);
  168.  
  169. #endif /* !__ASSEMBLY__ */
  170. #endif /* _ASM_X86_FIXMAP_H */
  171.