include/asm-powerpc/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 #ifdef CONFIG_PPC64
  16 #define THREAD_SHIFT            14
  17 #else
  18 #define THREAD_SHIFT            13
  19 #endif
  20
  21 #define THREAD_SIZE             (1 << THREAD_SHIFT)
  22
  23 #ifndef __ASSEMBLY__
  24 #include <linux/config.h>
  25 #include <linux/cache.h>
  26 #include <asm/processor.h>
  27 #include <asm/page.h>
  28 #include <linux/stringify.h>
  29
  30 /*
  31  * low level task data.
  32  */
  33 struct thread_info {
  34         struct task_struct *task;               /* main task structure */
  35         struct exec_domain *exec_domain;        /* execution domain */
  36         int             cpu;                    /* cpu we're on */
  37         int             preempt_count;          /* 0 => preemptable,
  38                                                    <0 => BUG */
  39         struct restart_block restart_block;
  40         /* low level flags - has atomic operations done on it */
  41         unsigned long   flags ____cacheline_aligned_in_smp;
  42 };
  43
  44 /*
  45  * macros/functions for gaining access to the thread information structure
  46  *
  47  * preempt_count needs to be 1 initially, until the scheduler is functional.
  48  */
  49 #define INIT_THREAD_INFO(tsk)                   \
  50 {                                               \
  51         .task =         &tsk,                   \
  52         .exec_domain =  &default_exec_domain,   \
  53         .cpu =          0,                      \
  54         .preempt_count = 1,                     \
  55         .restart_block = {                      \
  56                 .fn = do_no_restart_syscall,    \
  57         },                                      \
  58         .flags =        0,                      \
  59 }
  60
  61 #define init_thread_info        (init_thread_union.thread_info)
  62 #define init_stack              (init_thread_union.stack)
  63
  64 /* thread information allocation */
  65
  66 #if THREAD_SHIFT >= PAGE_SHIFT
  67
  68 #define THREAD_ORDER    (THREAD_SHIFT - PAGE_SHIFT)
  69
  70 #ifdef CONFIG_DEBUG_STACK_USAGE
  71 #define alloc_thread_info(tsk)  \
  72         ((struct thread_info *)__get_free_pages(GFP_KERNEL | \
  73                 __GFP_ZERO, THREAD_ORDER))
  74 #else
  75 #define alloc_thread_info(tsk)  \
  76         ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER))
  77 #endif
  78 #define free_thread_info(ti)    free_pages((unsigned long)ti, THREAD_ORDER)
  79
  80 #else /* THREAD_SHIFT < PAGE_SHIFT */
  81
  82 #ifdef CONFIG_DEBUG_STACK_USAGE
  83 #define alloc_thread_info(tsk)  kzalloc(THREAD_SIZE, GFP_KERNEL)
  84 #else
  85 #define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
  86 #endif
  87 #define free_thread_info(ti)    kfree(ti)
  88
  89 #endif /* THREAD_SHIFT < PAGE_SHIFT */
  90
  91 /* how to get the thread information struct from C */
  92 static inline struct thread_info *current_thread_info(void)
  93 {
  94         register unsigned long sp asm("r1");
  95
  96         /* gcc4, at least, is smart enough to turn this into a single
  97          * rlwinm for ppc32 and clrrdi for ppc64 */
  98         return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
  99 }
 100
 101 #endif /* __ASSEMBLY__ */
 102
 103 #define PREEMPT_ACTIVE          0x10000000
 104
 105 /*
 106  * thread information flag bit numbers
 107  */
 108 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 109 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 110 #define TIF_SIGPENDING          2       /* signal pending */
 111 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 112 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
 113                                            TIF_NEED_RESCHED */
 114 #define TIF_32BIT               5       /* 32 bit binary */
 115 #define TIF_RUNLATCH            6       /* Is the runlatch enabled? */
 116 #define TIF_ABI_PENDING         7       /* 32/64 bit switch needed */
 117 #define TIF_SYSCALL_AUDIT       8       /* syscall auditing active */
 118 #define TIF_SINGLESTEP          9       /* singlestepping active */
 119 #define TIF_MEMDIE              10
 120 #define TIF_SECCOMP             11      /* secure computing */
 121 #define TIF_RESTOREALL          12      /* Restore all regs (implies NOERROR) */
 122 #define TIF_NOERROR             14      /* Force successful syscall return */
 123 #define TIF_RESTORE_SIGMASK     15      /* Restore signal mask in do_signal */
 124
 125 /* as above, but as bit values */
 126 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 127 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 128 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 129 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 130 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 131 #define _TIF_32BIT              (1<<TIF_32BIT)
 132 #define _TIF_RUNLATCH           (1<<TIF_RUNLATCH)
 133 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 134 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 135 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 136 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 137 #define _TIF_RESTOREALL         (1<<TIF_RESTOREALL)
 138 #define _TIF_NOERROR            (1<<TIF_NOERROR)
 139 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 140 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
 141
 142 #define _TIF_USER_WORK_MASK     (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
 143                                  _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
 144 #define _TIF_PERSYSCALL_MASK    (_TIF_RESTOREALL|_TIF_NOERROR)
 145
 146 #endif /* __KERNEL__ */
 147
 148 #endif /* _ASM_POWERPC_THREAD_INFO_H */