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 #ifdef CONFIG_PPC64
  26 #define CURRENT_THREAD_INFO(dest, sp)   clrrdi dest, sp, THREAD_SHIFT
  27 #else
  28 #define CURRENT_THREAD_INFO(dest, sp)   rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT
  29 #endif
  30
  31 #ifndef __ASSEMBLY__
  32 #include <linux/cache.h>
  33 #include <asm/processor.h>
  34 #include <asm/page.h>
  35 #include <linux/stringify.h>
  36
  37 /*
  38  * low level task data.
  39  */
  40 struct thread_info {
  41         struct task_struct *task;               /* main task structure */
  42         struct exec_domain *exec_domain;        /* execution domain */
  43         int             cpu;                    /* cpu we're on */
  44         int             preempt_count;          /* 0 => preemptable,
  45                                                    <0 => BUG */
  46         struct restart_block restart_block;
  47         unsigned long   local_flags;            /* private flags for thread */
  48
  49         /* low level flags - has atomic operations done on it */
  50         unsigned long   flags ____cacheline_aligned_in_smp;
  51 };
  52
  53 /*
  54  * macros/functions for gaining access to the thread information structure
  55  */
  56 #define INIT_THREAD_INFO(tsk)                   \
  57 {                                               \
  58         .task =         &tsk,                   \
  59         .exec_domain =  &default_exec_domain,   \
  60         .cpu =          0,                      \
  61         .preempt_count = INIT_PREEMPT_COUNT,    \
  62         .restart_block = {                      \
  63                 .fn = do_no_restart_syscall,    \
  64         },                                      \
  65         .flags =        0,                      \
  66 }
  67
  68 #define init_thread_info        (init_thread_union.thread_info)
  69 #define init_stack              (init_thread_union.stack)
  70
  71 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  72
  73 /* how to get the thread information struct from C */
  74 static inline struct thread_info *current_thread_info(void)
  75 {
  76         register unsigned long sp asm("r1");
  77
  78         /* gcc4, at least, is smart enough to turn this into a single
  79          * rlwinm for ppc32 and clrrdi for ppc64 */
  80         return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
  81 }
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 #define PREEMPT_ACTIVE          0x10000000
  86
  87 /*
  88  * thread information flag bit numbers
  89  */
  90 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  91 #define TIF_SIGPENDING          1       /* signal pending */
  92 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  93 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  94                                            TIF_NEED_RESCHED */
  95 #define TIF_32BIT               4       /* 32 bit binary */
  96 #define TIF_PERFMON_WORK        5       /* work for pfm_handle_work() */
  97 #define TIF_PERFMON_CTXSW       6       /* perfmon needs ctxsw calls */
  98 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  99 #define TIF_SINGLESTEP          8       /* singlestepping active */
 100 #define TIF_MEMDIE              9       /* is terminating due to OOM killer */
 101 #define TIF_SECCOMP             10      /* secure computing */
 102 #define TIF_RESTOREALL          11      /* Restore all regs (implies NOERROR) */
 103 #define TIF_NOERROR             12      /* Force successful syscall return */
 104 #define TIF_NOTIFY_RESUME       13      /* callback before returning to user */
 105 #define TIF_UPROBE              14      /* breakpointed or single-stepping */
 106 #define TIF_SYSCALL_TRACEPOINT  15      /* syscall tracepoint instrumentation */
 107 #define TIF_EMULATE_STACK_STORE 16      /* Is an instruction emulation
 108                                                 for stack store? */
 109
 110 /* as above, but as bit values */
 111 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 112 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 113 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 114 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 115 #define _TIF_32BIT              (1<<TIF_32BIT)
 116 #define _TIF_PERFMON_WORK       (1<<TIF_PERFMON_WORK)
 117 #define _TIF_PERFMON_CTXSW      (1<<TIF_PERFMON_CTXSW)
 118 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 119 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 120 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 121 #define _TIF_RESTOREALL         (1<<TIF_RESTOREALL)
 122 #define _TIF_NOERROR            (1<<TIF_NOERROR)
 123 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 124 #define _TIF_UPROBE             (1<<TIF_UPROBE)
 125 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
 126 #define _TIF_EMULATE_STACK_STORE        (1<<TIF_EMULATE_STACK_STORE)
 127 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 128                                  _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)
 129
 130 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
 131                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE)
 132 #define _TIF_PERSYSCALL_MASK    (_TIF_RESTOREALL|_TIF_NOERROR)
 133
 134 /* Bits in local_flags */
 135 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
 136 #define TLF_NAPPING             0       /* idle thread enabled NAP mode */
 137 #define TLF_SLEEPING            1       /* suspend code enabled SLEEP mode */
 138 #define TLF_RESTORE_SIGMASK     2       /* Restore signal mask in do_signal */
 139 #define TLF_LAZY_MMU            3       /* tlb_batch is active */
 140 #define TLF_RUNLATCH            4       /* Is the runlatch enabled? */
 141
 142 #define _TLF_NAPPING            (1 << TLF_NAPPING)
 143 #define _TLF_SLEEPING           (1 << TLF_SLEEPING)
 144 #define _TLF_RESTORE_SIGMASK    (1 << TLF_RESTORE_SIGMASK)
 145 #define _TLF_LAZY_MMU           (1 << TLF_LAZY_MMU)
 146 #define _TLF_RUNLATCH           (1 << TLF_RUNLATCH)
 147
 148 #ifndef __ASSEMBLY__
 149 #define HAVE_SET_RESTORE_SIGMASK        1
 150 static inline void set_restore_sigmask(void)
 151 {
 152         struct thread_info *ti = current_thread_info();
 153         ti->local_flags |= _TLF_RESTORE_SIGMASK;
 154         WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
 155 }
 156 static inline void clear_restore_sigmask(void)
 157 {
 158         current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
 159 }
 160 static inline bool test_restore_sigmask(void)
 161 {
 162         return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
 163 }
 164 static inline bool test_and_clear_restore_sigmask(void)
 165 {
 166         struct thread_info *ti = current_thread_info();
 167         if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
 168                 return false;
 169         ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
 170         return true;
 171 }
 172
 173 static inline bool test_thread_local_flags(unsigned int flags)
 174 {
 175         struct thread_info *ti = current_thread_info();
 176         return (ti->local_flags & flags) != 0;
 177 }
 178
 179 #ifdef CONFIG_PPC64
 180 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 181 #else
 182 #define is_32bit_task() (1)
 183 #endif
 184
 185 #endif  /* !__ASSEMBLY__ */
 186
 187 #endif /* __KERNEL__ */
 188
 189 #endif /* _ASM_POWERPC_THREAD_INFO_H */