linux-4.4.1/__PAGE_OFFSET の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/__PAGE_OFFSET へ行く。
  • 1 (2016-04-15 (金) 10:23:10)

参照元†

• linux-4.4.1/PAGE_OFFSET(x86)

説明†

• パス: 複数あり
  • CONFIG_X86_64 無効: linux-4.4.1/arch/x86/include/asm/page_32_types.h
  • CONFIG_X86_64 有効: linux-4.4.1/arch/x86/include/asm/page_64_types.h
    • arch/x86/include/asm/page.h
    • arch/x86/include/asm/page_64.h
    • arch/x86/include/asm/page_64_types.h
  • linux-4.4.1/CONFIG_

• FIXME: これは何？
  • 説明

参考†

実装†

• CONFIG_X86_64 無効: linux-4.4.1/arch/x86/include/asm/page_32_types.h

  /*
   * This handles the memory map.
   *
   * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
   * a virtual address space of one gigabyte, which limits the
   * amount of physical memory you can use to about 950MB.
   *
   * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
   * and CONFIG_HIGHMEM64G options in the kernel configuration.
   */
  #define __PAGE_OFFSET           _AC(CONFIG_PAGE_OFFSET, UL)

• • linux-4.4.1/_AC()
  • linux-4.4.1/CONFIG_PAGE_OFFSET

• CONFIG_X86_64 有効: linux-4.4.1/arch/x86/include/asm/page_64_types.h

/*
 * Set __PAGE_OFFSET to the most negative possible address +
 * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a
 * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's
 * what Xen requires.
 */
#define __PAGE_OFFSET           _AC(0xffff880000000000, UL)

コメント†