kitten/arch/x86_64/kernel/init_task.c

   1 #include <lwk/task.h>
   2 #include <lwk/init_task.h>
   3 #include <lwk/percpu.h>
   4 #include <lwk/aspace.h>
   5 #include <arch/processor.h>
   6
   7 struct aspace bootstrap_aspace = {
   8         BOOTSTRAP_ASPACE(bootstrap_aspace)
   9         .arch = {
  10                 .pgd = (xpte_t *) init_level4_pgt
  11         }
  12 };
  13
  14 union task_union bootstrap_task_union
  15         __attribute__((__section__(".data.bootstrap_task"))) =
  16                 {
  17                         /* Initialize task_union.task_info */
  18                         {
  19                                 /* arch independent portion */
  20                                 BOOTSTRAP_TASK(bootstrap_task_union.task_info)
  21
  22                                 /* x86_64 specific portion */
  23                                 .arch = {
  24                                         .addr_limit = PAGE_OFFSET
  25                                 }
  26                         }
  27                 };
  28
  29 /**
  30  * Each CPU gets its own Task State Segment (TSS) structure. Tasks are
  31  * completely 'soft' in the LWK, no more per-task TSS's and hardware task
  32  * switching... we switch tasks completely in software. The TSS size is kept
  33  * cacheline-aligned so they are allowed to end up in the
  34  * .data.cacheline_aligned section. Since TSS's are completely CPU-local, we
  35  * want them on exact cacheline boundaries, to eliminate cacheline ping-pong.
  36  */
  37 DEFINE_PER_CPU(struct tss_struct, tss)
  38 ____cacheline_internodealigned_in_smp = BOOTSTRAP_TSS;
  39