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)   stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
  27 #else
  28 #define CURRENT_THREAD_INFO(dest, sp)   stringify_in_c(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 #include <asm/accounting.h>
  37
  38 /*
  39  * low level task data.
  40  */
  41 struct thread_info {
  42         struct task_struct *task;               /* main task structure */
  43         int             cpu;                    /* cpu we're on */
  44         int             preempt_count;          /* 0 => preemptable,
  45                                                    <0 => BUG */
  46         unsigned long   local_flags;            /* private flags for thread */
  47 #ifdef CONFIG_LIVEPATCH
  48         unsigned long *livepatch_sp;
  49 #endif
  50 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
  51         struct cpu_accounting_data accounting;
  52 #endif
  53         /* low level flags - has atomic operations done on it */
  54         unsigned long   flags ____cacheline_aligned_in_smp;
  55 };
  56
  57 /*
  58  * macros/functions for gaining access to the thread information structure
  59  */
  60 #define INIT_THREAD_INFO(tsk)                   \
  61 {                                               \
  62         .task =         &tsk,                   \
  63         .cpu =          0,                      \
  64         .preempt_count = INIT_PREEMPT_COUNT,    \
  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         unsigned long val;
  77
  78         asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
  79
  80         return (struct thread_info *)val;
  81 }
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 /*
  86  * thread information flag bit numbers
  87  */
  88 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  89 #define TIF_SIGPENDING          1       /* signal pending */
  90 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  91 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  92                                            TIF_NEED_RESCHED */
  93 #define TIF_32BIT               4       /* 32 bit binary */
  94 #define TIF_RESTORE_TM          5       /* need to restore TM FP/VEC/VSX */
  95 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  96 #define TIF_SINGLESTEP          8       /* singlestepping active */
  97 #define TIF_NOHZ                9       /* in adaptive nohz mode */
  98 #define TIF_SECCOMP             10      /* secure computing */
  99 #define TIF_RESTOREALL          11      /* Restore all regs (implies NOERROR) */
 100 #define TIF_NOERROR             12      /* Force successful syscall return */
 101 #define TIF_NOTIFY_RESUME       13      /* callback before returning to user */
 102 #define TIF_UPROBE              14      /* breakpointed or single-stepping */
 103 #define TIF_SYSCALL_TRACEPOINT  15      /* syscall tracepoint instrumentation */
 104 #define TIF_EMULATE_STACK_STORE 16      /* Is an instruction emulation
 105                                                 for stack store? */
 106 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 107 #if defined(CONFIG_PPC64)
 108 #define TIF_ELF2ABI             18      /* function descriptors must die! */
 109 #endif
 110
 111 /* as above, but as bit values */
 112 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 113 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 114 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 115 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 116 #define _TIF_32BIT              (1<<TIF_32BIT)
 117 #define _TIF_RESTORE_TM         (1<<TIF_RESTORE_TM)
 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_NOHZ               (1<<TIF_NOHZ)
 128 #define _TIF_SYSCALL_DOTRACE    (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 129                                  _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
 130                                  _TIF_NOHZ)
 131
 132 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
 133                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
 134                                  _TIF_RESTORE_TM)
 135 #define _TIF_PERSYSCALL_MASK    (_TIF_RESTOREALL|_TIF_NOERROR)
 136
 137 /* Bits in local_flags */
 138 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
 139 #define TLF_NAPPING             0       /* idle thread enabled NAP mode */
 140 #define TLF_SLEEPING            1       /* suspend code enabled SLEEP mode */
 141 #define TLF_LAZY_MMU            3       /* tlb_batch is active */
 142 #define TLF_RUNLATCH            4       /* Is the runlatch enabled? */
 143
 144 #define _TLF_NAPPING            (1 << TLF_NAPPING)
 145 #define _TLF_SLEEPING           (1 << TLF_SLEEPING)
 146 #define _TLF_LAZY_MMU           (1 << TLF_LAZY_MMU)
 147 #define _TLF_RUNLATCH           (1 << TLF_RUNLATCH)
 148
 149 #ifndef __ASSEMBLY__
 150
 151 static inline bool test_thread_local_flags(unsigned int flags)
 152 {
 153         struct thread_info *ti = current_thread_info();
 154         return (ti->local_flags & flags) != 0;
 155 }
 156
 157 #ifdef CONFIG_PPC64
 158 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 159 #else
 160 #define is_32bit_task() (1)
 161 #endif
 162
 163 #if defined(CONFIG_PPC64)
 164 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
 165 #else
 166 #define is_elf2_task() (0)
 167 #endif
 168
 169 #endif  /* !__ASSEMBLY__ */
 170
 171 #endif /* __KERNEL__ */
 172
 173 #endif /* _ASM_POWERPC_THREAD_INFO_H */