arch/microblaze/include/asm/thread_info.h

   1 /*
   2  * Copyright (C) 2006 Atmark Techno, Inc.
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License. See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #ifndef _ASM_MICROBLAZE_THREAD_INFO_H
  10 #define _ASM_MICROBLAZE_THREAD_INFO_H
  11
  12 #ifdef __KERNEL__
  13
  14 /* we have 8k stack */
  15 #define THREAD_SHIFT            13
  16 #define THREAD_SIZE             (1 << THREAD_SHIFT)
  17 #define THREAD_SIZE_ORDER       1
  18
  19 #ifndef __ASSEMBLY__
  20 # include <linux/types.h>
  21 # include <asm/processor.h>
  22
  23 /*
  24  * low level task data that entry.S needs immediate access to
  25  * - this struct should fit entirely inside of one cache line
  26  * - this struct shares the supervisor stack pages
  27  * - if the contents of this structure are changed, the assembly constants
  28  *       must also be changed
  29  */
  30
  31 struct cpu_context {
  32         __u32   r1; /* stack pointer */
  33         __u32   r2;
  34         /* dedicated registers */
  35         __u32   r13;
  36         __u32   r14;
  37         __u32   r15;
  38         __u32   r16;
  39         __u32   r17;
  40         __u32   r18;
  41         /* non-volatile registers */
  42         __u32   r19;
  43         __u32   r20;
  44         __u32   r21;
  45         __u32   r22;
  46         __u32   r23;
  47         __u32   r24;
  48         __u32   r25;
  49         __u32   r26;
  50         __u32   r27;
  51         __u32   r28;
  52         __u32   r29;
  53         __u32   r30;
  54         /* r31 is used as current task pointer */
  55         /* special purpose registers */
  56         __u32   msr;
  57         __u32   ear;
  58         __u32   esr;
  59         __u32   fsr;
  60 };
  61
  62 typedef struct {
  63         unsigned long seg;
  64 } mm_segment_t;
  65
  66 struct thread_info {
  67         struct task_struct      *task; /* main task structure */
  68         struct exec_domain      *exec_domain; /* execution domain */
  69         unsigned long           flags; /* low level flags */
  70         unsigned long           status; /* thread-synchronous flags */
  71         __u32                   cpu; /* current CPU */
  72         __s32                   preempt_count; /* 0 => preemptable,< 0 => BUG*/
  73         mm_segment_t            addr_limit; /* thread address space */
  74
  75         struct cpu_context      cpu_context;
  76 };
  77
  78 /*
  79  * macros/functions for gaining access to the thread information structure
  80  */
  81 #define INIT_THREAD_INFO(tsk)                   \
  82 {                                               \
  83         .task           = &tsk,                 \
  84         .exec_domain    = &default_exec_domain, \
  85         .flags          = 0,                    \
  86         .cpu            = 0,                    \
  87         .preempt_count  = INIT_PREEMPT_COUNT,   \
  88         .addr_limit     = KERNEL_DS,            \
  89 }
  90
  91 #define init_thread_info        (init_thread_union.thread_info)
  92 #define init_stack              (init_thread_union.stack)
  93
  94 /* how to get the thread information struct from C */
  95 static inline struct thread_info *current_thread_info(void)
  96 {
  97         register unsigned long sp asm("r1");
  98
  99         return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
 100 }
 101
 102 /* thread information allocation */
 103 #endif /* __ASSEMBLY__ */
 104
 105 /*
 106  * thread information flags
 107  * - these are process state flags that various assembly files may
 108  *   need to access
 109  * - pending work-to-be-done flags are in LSW
 110  * - other flags in MSW
 111  */
 112 #define TIF_SYSCALL_TRACE       0 /* syscall trace active */
 113 #define TIF_NOTIFY_RESUME       1 /* resumption notification requested */
 114 #define TIF_SIGPENDING          2 /* signal pending */
 115 #define TIF_NEED_RESCHED        3 /* rescheduling necessary */
 116 /* restore singlestep on return to user mode */
 117 #define TIF_SINGLESTEP          4
 118 #define TIF_MEMDIE              6       /* is terminating due to OOM killer */
 119 #define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
 120 #define TIF_SECCOMP             10      /* secure computing */
 121
 122 /* true if poll_idle() is polling TIF_NEED_RESCHED */
 123 #define TIF_POLLING_NRFLAG      16
 124
 125 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 126 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 127 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 128 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 129 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 130 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 131 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 132 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 133
 134 /* work to do in syscall trace */
 135 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 136                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
 137
 138 /* work to do on interrupt/exception return */
 139 #define _TIF_WORK_MASK          0x0000FFFE
 140
 141 /* work to do on any return to u-space */
 142 #define _TIF_ALLWORK_MASK       0x0000FFFF
 143
 144 /*
 145  * Thread-synchronous status.
 146  *
 147  * This is different from the flags in that nobody else
 148  * ever touches our thread-synchronous status, so we don't
 149  * have to worry about atomic accesses.
 150  */
 151 /* FPU was used by this task this quantum (SMP) */
 152 #define TS_USEDFPU              0x0001
 153 #define TS_RESTORE_SIGMASK      0x0002
 154
 155 #ifndef __ASSEMBLY__
 156 #define HAVE_SET_RESTORE_SIGMASK 1
 157 static inline void set_restore_sigmask(void)
 158 {
 159         struct thread_info *ti = current_thread_info();
 160         ti->status |= TS_RESTORE_SIGMASK;
 161         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
 162 }
 163 static inline void clear_restore_sigmask(void)
 164 {
 165         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 166 }
 167 static inline bool test_restore_sigmask(void)
 168 {
 169         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 170 }
 171 static inline bool test_and_clear_restore_sigmask(void)
 172 {
 173         struct thread_info *ti = current_thread_info();
 174         if (!(ti->status & TS_RESTORE_SIGMASK))
 175                 return false;
 176         ti->status &= ~TS_RESTORE_SIGMASK;
 177         return true;
 178 }
 179 #endif
 180
 181 #endif /* __KERNEL__ */
 182 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */