arch/x86_64/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 EXPORT_SYMBOL(init_mm);
  20
  21 /*
  22  * Initial task structure.
  23  *
  24  * We need to make sure that this is 8192-byte aligned due to the
  25  * way process stacks are handled. This is done by having a special
  26  * "init_task" linker map entry..
  27  */
  28 union thread_union init_thread_union
  29         __attribute__((__section__(".data.init_task"))) =
  30                 { INIT_THREAD_INFO(init_task) };
  31
  32 /*
  33  * Initial task structure.
  34  *
  35  * All other task structs will be allocated on slabs in fork.c
  36  */
  37 struct task_struct init_task = INIT_TASK(init_task);
  38
  39 EXPORT_SYMBOL(init_task);
  40 /*
  41  * per-CPU TSS segments. Threads are completely 'soft' on Linux,
  42  * no more per-task TSS's. The TSS size is kept cacheline-aligned
  43  * so they are allowed to end up in the .data.cacheline_aligned
  44  * section. Since TSS's are completely CPU-local, we want them
  45  * on exact cacheline boundaries, to eliminate cacheline ping-pong.
  46  */
  47 DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_internodealigned_in_smp = INIT_TSS;
  48
  49 /* Copies of the original ist values from the tss are only accessed during
  50  * debugging, no special alignment required.
  51  */
  52 DEFINE_PER_CPU(struct orig_ist, orig_ist);
  53
  54 #define ALIGN_TO_4K __attribute__((section(".data.init_task")))