arch/powerpc/include/asm/thread_info.h

   1 /* thread_info.h: PowerPC low-level thread information
   2  * adapted from the i386 version by Paul Mackerras
   3  *
   4  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   5  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   6  */
   7
   8 #ifndef _ASM_POWERPC_THREAD_INFO_H
   9 #define _ASM_POWERPC_THREAD_INFO_H
  10
  11 #ifdef __KERNEL__
  12
  13 /* We have 8k stacks on ppc32 and 16k on ppc64 */
  14
  15 #if defined(CONFIG_PPC64)
  16 #define THREAD_SHIFT            14
  17 #elif defined(CONFIG_PPC_256K_PAGES)
  18 #define THREAD_SHIFT            15
  19 #else
  20 #define THREAD_SHIFT            13
  21 #endif
  22
  23 #define THREAD_SIZE             (1 << THREAD_SHIFT)
  24
  25 #ifndef __ASSEMBLY__
  26 #include <linux/cache.h>
  27 #include <asm/processor.h>
  28 #include <asm/page.h>
  29 #include <linux/stringify.h>
  30
  31 /*
  32  * low level task data.
  33  */
  34 struct thread_info {
  35         struct task_struct *task;               /* main task structure */
  36         struct exec_domain *exec_domain;        /* execution domain */
  37         int             cpu;                    /* cpu we're on */
  38         int             preempt_count;          /* 0 => preemptable,
  39                                                    <0 => BUG */
  40         struct restart_block restart_block;
  41         unsigned long   local_flags;            /* private flags for thread */
  42
  43         /* low level flags - has atomic operations done on it */
  44         unsigned long   flags ____cacheline_aligned_in_smp;
  45 };
  46
  47 /*
  48  * macros/functions for gaining access to the thread information structure
  49  *
  50  * preempt_count needs to be 1 initially, until the scheduler is functional.
  51  */
  52 #define INIT_THREAD_INFO(tsk)                   \
  53 {                                               \
  54         .task =         &tsk,                   \
  55         .exec_domain =  &default_exec_domain,   \
  56         .cpu =          0,                      \
  57         .preempt_count = 1,                     \
  58         .restart_block = {                      \
  59                 .fn = do_no_restart_syscall,    \
  60         },                                      \
  61         .flags =        0,                      \
  62 }
  63
  64 #define init_thread_info        (init_thread_union.thread_info)
  65 #define init_stack              (init_thread_union.stack)
  66
  67 /* thread information allocation */
  68
  69 #if THREAD_SHIFT >= PAGE_SHIFT
  70
  71 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  72
  73 #else /* THREAD_SHIFT < PAGE_SHIFT */
  74
  75 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  76
  77 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
  78 extern void free_thread_info(struct thread_info *ti);
  79
  80 #endif /* THREAD_SHIFT < PAGE_SHIFT */
  81
  82 /* how to get the thread information struct from C */
  83 static inline struct thread_info *current_thread_info(void)
  84 {
  85         register unsigned long sp asm("r1");
  86
  87         /* gcc4, at least, is smart enough to turn this into a single
  88          * rlwinm for ppc32 and clrrdi for ppc64 */
  89         return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
  90 }
  91
  92 #endif /* __ASSEMBLY__ */
  93
  94 #define PREEMPT_ACTIVE          0x10000000
  95
  96 /*
  97  * thread information flag bit numbers
  98  */
  99 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 100 #define TIF_SIGPENDING          1       /* signal pending */
 101 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 102 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
 103                                            TIF_NEED_RESCHED */
 104 #define TIF_32BIT               4       /* 32 bit binary */
 105 #define TIF_PERFMON_WORK        5       /* work for pfm_handle_work() */
 106 #define TIF_PERFMON_CTXSW       6       /* perfmon needs ctxsw calls */
 107 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
 108 #define TIF_SINGLESTEP          8       /* singlestepping active */
 109 #define TIF_MEMDIE              9
 110 #define TIF_SECCOMP             10      /* secure computing */
 111 #define TIF_RESTOREALL          11      /* Restore all regs (implies NOERROR) */
 112 #define TIF_NOERROR             12      /* Force successful syscall return */
 113 #define TIF_NOTIFY_RESUME       13      /* callback before returning to user */
 114 #define TIF_FREEZE              14      /* Freezing for suspend */
 115 #define TIF_RUNLATCH            15      /* Is the runlatch enabled? */
 116 #define TIF_ABI_PENDING         16      /* 32/64 bit switch needed */
 117
 118 /* as above, but as bit values */
 119 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 120 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 121 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 122 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 123 #define _TIF_32BIT              (1<<TIF_32BIT)
 124 #define _TIF_PERFMON_WORK       (1<<TIF_PERFMON_WORK)
 125 #define _TIF_PERFMON_CTXSW      (1<<TIF_PERFMON_CTXSW)
 126 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 127 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 128 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 129 #define _TIF_RESTOREALL         (1<<TIF_RESTOREALL)
 130 #define _TIF_NOERROR            (1<<TIF_NOERROR)
 131 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 132 #define _TIF_FREEZE             (1<<TIF_FREEZE)
 133 #define _TIF_RUNLATCH           (1<<TIF_RUNLATCH)
 134 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 135 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
 136
 137 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
 138                                  _TIF_NOTIFY_RESUME)
 139 #define _TIF_PERSYSCALL_MASK    (_TIF_RESTOREALL|_TIF_NOERROR)
 140
 141 /* Bits in local_flags */
 142 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
 143 #define TLF_NAPPING             0       /* idle thread enabled NAP mode */
 144 #define TLF_SLEEPING            1       /* suspend code enabled SLEEP mode */
 145 #define TLF_RESTORE_SIGMASK     2       /* Restore signal mask in do_signal */
 146
 147 #define _TLF_NAPPING            (1 << TLF_NAPPING)
 148 #define _TLF_SLEEPING           (1 << TLF_SLEEPING)
 149 #define _TLF_RESTORE_SIGMASK    (1 << TLF_RESTORE_SIGMASK)
 150
 151 #ifndef __ASSEMBLY__
 152 #define HAVE_SET_RESTORE_SIGMASK        1
 153 static inline void set_restore_sigmask(void)
 154 {
 155         struct thread_info *ti = current_thread_info();
 156         ti->local_flags |= _TLF_RESTORE_SIGMASK;
 157         set_bit(TIF_SIGPENDING, &ti->flags);
 158 }
 159
 160 #ifdef CONFIG_PPC64
 161 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 162 #else
 163 #define is_32bit_task() (1)
 164 #endif
 165
 166 #endif  /* !__ASSEMBLY__ */
 167
 168 #endif /* __KERNEL__ */
 169
 170 #endif /* _ASM_POWERPC_THREAD_INFO_H */