arch/um/sys-x86_64/shared/sysdep/host_ldt.h

   1 #ifndef __ASM_HOST_LDT_X86_64_H
   2 #define __ASM_HOST_LDT_X86_64_H
   3
   4 #include <asm/ldt.h>
   5
   6 /*
   7  * macros stolen from include/asm-x86_64/desc.h
   8  */
   9 #define LDT_entry_a(info) \
  10         ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
  11
  12 /* Don't allow setting of the lm bit. It is useless anyways because
  13  * 64bit system calls require __USER_CS. */
  14 #define LDT_entry_b(info) \
  15         (((info)->base_addr & 0xff000000) | \
  16         (((info)->base_addr & 0x00ff0000) >> 16) | \
  17         ((info)->limit & 0xf0000) | \
  18         (((info)->read_exec_only ^ 1) << 9) | \
  19         ((info)->contents << 10) | \
  20         (((info)->seg_not_present ^ 1) << 15) | \
  21         ((info)->seg_32bit << 22) | \
  22         ((info)->limit_in_pages << 23) | \
  23         ((info)->useable << 20) | \
  24         /* ((info)->lm << 21) | */ \
  25         0x7000)
  26
  27 #define LDT_empty(info) (\
  28         (info)->base_addr       == 0    && \
  29         (info)->limit           == 0    && \
  30         (info)->contents        == 0    && \
  31         (info)->read_exec_only  == 1    && \
  32         (info)->seg_32bit       == 0    && \
  33         (info)->limit_in_pages  == 0    && \
  34         (info)->seg_not_present == 1    && \
  35         (info)->useable         == 0    && \
  36         (info)->lm              == 0)
  37
  38 #endif