LXR linux/arch/m68k/include/asm/thread

   1#ifndef _ASM_M68K_THREAD_INFO_H
   2#define _ASM_M68K_THREAD_INFO_H
   3
   4#include <asm/types.h>
   5#include <asm/page.h>
   6#include <asm/segment.h>
   7
   8/*
   9 * On machines with 4k pages we default to an 8k thread size, though we
  10 * allow a 4k with config option. Any other machine page size then
  11 * the thread size must match the page size (which is 8k and larger here).
  12 */
  13#if PAGE_SHIFT < 13
  14#ifdef CONFIG_4KSTACKS
  15#define THREAD_SIZE     4096
  16#else
  17#define THREAD_SIZE     8192
  18#endif
  19#else
  20#define THREAD_SIZE     PAGE_SIZE
  21#endif
  22#define THREAD_SIZE_ORDER       ((THREAD_SIZE / PAGE_SIZE) - 1)
  23
  24#ifndef __ASSEMBLY__
  25
  26struct thread_info {
  27        struct task_struct      *task;          /* main task structure */
  28        unsigned long           flags;
  29        struct exec_domain      *exec_domain;   /* execution domain */
  30        mm_segment_t            addr_limit;     /* thread address space */
  31        int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  32        __u32                   cpu;            /* should always be 0 on m68k */
  33        unsigned long           tp_value;       /* thread pointer */
  34        struct restart_block    restart_block;
  35};
  36#endif /* __ASSEMBLY__ */
  37
  38#define PREEMPT_ACTIVE          0x4000000
  39
  40#define INIT_THREAD_INFO(tsk)                   \
  41{                                               \
  42        .task           = &tsk,                 \
  43        .exec_domain    = &default_exec_domain, \
  44        .addr_limit     = KERNEL_DS,            \
  45        .preempt_count  = INIT_PREEMPT_COUNT,   \
  46        .restart_block = {                      \
  47                .fn = do_no_restart_syscall,    \
  48        },                                      \
  49}
  50
  51#define init_stack              (init_thread_union.stack)
  52
  53#ifndef __ASSEMBLY__
  54/* how to get the thread information struct from C */
  55static inline struct thread_info *current_thread_info(void)
  56{
  57        struct thread_info *ti;
  58        __asm__(
  59                "move.l %%sp, %0 \n\t"
  60                "and.l  %1, %0"
  61                : "=&d"(ti)
  62                : "di" (~(THREAD_SIZE-1))
  63                );
  64        return ti;
  65}
  66#endif
  67
  68#define init_thread_info        (init_thread_union.thread_info)
  69
  70/* entry.S relies on these definitions!
  71 * bits 0-7 are tested at every exception exit
  72 * bits 8-15 are also tested at syscall exit
  73 */
  74#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  75#define TIF_SIGPENDING          6       /* signal pending */
  76#define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  77#define TIF_DELAYED_TRACE       14      /* single step a syscall */
  78#define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  79#define TIF_MEMDIE              16      /* is terminating due to OOM killer */
  80#define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
  81
  82#endif  /* _ASM_M68K_THREAD_INFO_H */
  83