root/arch/x86/include/asm/pgtable_32_types.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PGTABLE_32_DEFS_H
   3 #define _ASM_X86_PGTABLE_32_DEFS_H
   4 
   5 /*
   6  * The Linux x86 paging architecture is 'compile-time dual-mode', it
   7  * implements both the traditional 2-level x86 page tables and the
   8  * newer 3-level PAE-mode page tables.
   9  */
  10 #ifdef CONFIG_X86_PAE
  11 # include <asm/pgtable-3level_types.h>
  12 # define PMD_SIZE       (1UL << PMD_SHIFT)
  13 # define PMD_MASK       (~(PMD_SIZE - 1))
  14 #else
  15 # include <asm/pgtable-2level_types.h>
  16 #endif
  17 
  18 #define pgtable_l5_enabled() 0
  19 
  20 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  21 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  22 
  23 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  24  * current 8MB value just means that there will be a 8MB "hole" after the
  25  * physical memory until the kernel virtual memory starts.  That means that
  26  * any out-of-bounds memory accesses will hopefully be caught.
  27  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  28  * area for the same reason. ;)
  29  */
  30 #define VMALLOC_OFFSET  (8 * 1024 * 1024)
  31 
  32 #ifndef __ASSEMBLY__
  33 extern bool __vmalloc_start_set; /* set once high_memory is set */
  34 #endif
  35 
  36 #define VMALLOC_START   ((unsigned long)high_memory + VMALLOC_OFFSET)
  37 #ifdef CONFIG_X86_PAE
  38 #define LAST_PKMAP 512
  39 #else
  40 #define LAST_PKMAP 1024
  41 #endif
  42 
  43 /*
  44  * Define this here and validate with BUILD_BUG_ON() in pgtable_32.c
  45  * to avoid include recursion hell
  46  */
  47 #define CPU_ENTRY_AREA_PAGES    (NR_CPUS * 39)
  48 
  49 /* The +1 is for the readonly IDT page: */
  50 #define CPU_ENTRY_AREA_BASE     \
  51         ((FIXADDR_TOT_START - PAGE_SIZE*(CPU_ENTRY_AREA_PAGES+1)) & PMD_MASK)
  52 
  53 #define LDT_BASE_ADDR           \
  54         ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)
  55 
  56 #define LDT_END_ADDR            (LDT_BASE_ADDR + PMD_SIZE)
  57 
  58 #define PKMAP_BASE              \
  59         ((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)
  60 
  61 #ifdef CONFIG_HIGHMEM
  62 # define VMALLOC_END    (PKMAP_BASE - 2 * PAGE_SIZE)
  63 #else
  64 # define VMALLOC_END    (LDT_BASE_ADDR - 2 * PAGE_SIZE)
  65 #endif
  66 
  67 #define MODULES_VADDR   VMALLOC_START
  68 #define MODULES_END     VMALLOC_END
  69 #define MODULES_LEN     (MODULES_VADDR - MODULES_END)
  70 
  71 #define MAXMEM  (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
  72 
  73 #endif /* _ASM_X86_PGTABLE_32_DEFS_H */