arch/x86/kernel/init_task.c

   1 #include <linux/mm.h>
   2 #include <linux/module.h>
   3 #include <linux/sched.h>
   4 #include <linux/init.h>
   5 #include <linux/init_task.h>
   6 #include <linux/fs.h>
   7 #include <linux/mqueue.h>
   8
   9 #include <asm/uaccess.h>
  10 #include <asm/pgtable.h>
  11 #include <asm/desc.h>
  12
  13 static struct fs_struct init_fs = INIT_FS;
  14 static struct files_struct init_files = INIT_FILES;
  15 static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
  16 static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
  17 struct mm_struct init_mm = INIT_MM(init_mm);
  18 EXPORT_SYMBOL(init_mm);
  19
  20 /*
  21  * Initial thread structure.
  22  *
  23  * We need to make sure that this is THREAD_SIZE aligned due to the
  24  * way process stacks are handled. This is done by having a special
  25  * "init_task" linker map entry..
  26  */
  27 union thread_union init_thread_union
  28         __attribute__((__section__(".data.init_task"))) =
  29                 { INIT_THREAD_INFO(init_task) };
  30
  31 /*
  32  * Initial task structure.
  33  *
  34  * All other task structs will be allocated on slabs in fork.c
  35  */
  36 struct task_struct init_task = INIT_TASK(init_task);
  37 EXPORT_SYMBOL(init_task);
  38
  39 /*
  40  * per-CPU TSS segments. Threads are completely 'soft' on Linux,
  41  * no more per-task TSS's. The TSS size is kept cacheline-aligned
  42  * so they are allowed to end up in the .data.cacheline_aligned
  43  * section. Since TSS's are completely CPU-local, we want them
  44  * on exact cacheline boundaries, to eliminate cacheline ping-pong.
  45  */
  46 DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS;
  47