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
  19 /*
  20  * Initial thread structure.
  21  *
  22  * We need to make sure that this is THREAD_SIZE aligned due to the
  23  * way process stacks are handled. This is done by having a special
  24  * "init_task" linker map entry..
  25  */
  26 union thread_union init_thread_union
  27         __attribute__((__section__(".data.init_task"))) =
  28                 { INIT_THREAD_INFO(init_task) };
  29
  30 /*
  31  * Initial task structure.
  32  *
  33  * All other task structs will be allocated on slabs in fork.c
  34  */
  35 struct task_struct init_task = INIT_TASK(init_task);
  36 EXPORT_SYMBOL(init_task);
  37
  38 /*
  39  * per-CPU TSS segments. Threads are completely 'soft' on Linux,
  40  * no more per-task TSS's. The TSS size is kept cacheline-aligned
  41  * so they are allowed to end up in the .data.cacheline_aligned
  42  * section. Since TSS's are completely CPU-local, we want them
  43  * on exact cacheline boundaries, to eliminate cacheline ping-pong.
  44  */
  45 DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS;
  46