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 # include <asm/segment.h>
  23
  24 /*
  25  * low level task data that entry.S needs immediate access to
  26  * - this struct should fit entirely inside of one cache line
  27  * - this struct shares the supervisor stack pages
  28  * - if the contents of this structure are changed, the assembly constants
  29  *       must also be changed
  30  */
  31
  32 struct cpu_context {
  33         __u32   r1; /* stack pointer */
  34         __u32   r2;
  35         /* dedicated registers */
  36         __u32   r13;
  37         __u32   r14;
  38         __u32   r15;
  39         __u32   r16;
  40         __u32   r17;
  41         __u32   r18;
  42         /* non-volatile registers */
  43         __u32   r19;
  44         __u32   r20;
  45         __u32   r21;
  46         __u32   r22;
  47         __u32   r23;
  48         __u32   r24;
  49         __u32   r25;
  50         __u32   r26;
  51         __u32   r27;
  52         __u32   r28;
  53         __u32   r29;
  54         __u32   r30;
  55         /* r31 is used as current task pointer */
  56         /* special purpose registers */
  57         __u32   msr;
  58         __u32   ear;
  59         __u32   esr;
  60         __u32   fsr;
  61 };
  62
  63 struct thread_info {
  64         struct task_struct      *task; /* main task structure */
  65         struct exec_domain      *exec_domain; /* execution domain */
  66         unsigned long           flags; /* low level flags */
  67         unsigned long           status; /* thread-synchronous flags */
  68         __u32                   cpu; /* current CPU */
  69         __s32                   preempt_count; /* 0 => preemptable,< 0 => BUG*/
  70         mm_segment_t            addr_limit; /* thread address space */
  71         struct restart_block    restart_block;
  72
  73         struct cpu_context      cpu_context;
  74 };
  75
  76 /*
  77  * macros/functions for gaining access to the thread information structure
  78  */
  79 #define INIT_THREAD_INFO(tsk)                   \
  80 {                                               \
  81         .task           = &tsk,                 \
  82         .exec_domain    = &default_exec_domain, \
  83         .flags          = 0,                    \
  84         .cpu            = 0,                    \
  85         .preempt_count  = INIT_PREEMPT_COUNT,   \
  86         .addr_limit     = KERNEL_DS,            \
  87         .restart_block = {                      \
  88                 .fn = do_no_restart_syscall,    \
  89         },                                      \
  90 }
  91
  92 #define init_thread_info        (init_thread_union.thread_info)
  93 #define init_stack              (init_thread_union.stack)
  94
  95 /* how to get the thread information struct from C */
  96 static inline struct thread_info *current_thread_info(void)
  97 {
  98         register unsigned long sp asm("r1");
  99
 100         return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
 101 }
 102
 103 /* thread information allocation */
 104 #endif /* __ASSEMBLY__ */
 105
 106 #define PREEMPT_ACTIVE          0x10000000
 107
 108 /*
 109  * thread information flags
 110  * - these are process state flags that various assembly files may
 111  *   need to access
 112  * - pending work-to-be-done flags are in LSW
 113  * - other flags in MSW
 114  */
 115 #define TIF_SYSCALL_TRACE       0 /* syscall trace active */
 116 #define TIF_NOTIFY_RESUME       1 /* resumption notification requested */
 117 #define TIF_SIGPENDING          2 /* signal pending */
 118 #define TIF_NEED_RESCHED        3 /* rescheduling necessary */
 119 /* restore singlestep on return to user mode */
 120 #define TIF_SINGLESTEP          4
 121 #define TIF_IRET                5 /* return with iret */
 122 #define TIF_MEMDIE              6
 123 #define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
 124 #define TIF_SECCOMP             10      /* secure computing */
 125 #define TIF_FREEZE              14      /* Freezing for suspend */
 126
 127 /* FIXME change in entry.S */
 128 #define TIF_KERNEL_TRACE        8       /* kernel trace active */
 129
 130 /* true if poll_idle() is polling TIF_NEED_RESCHED */
 131 #define TIF_POLLING_NRFLAG      16
 132
 133 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 134 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 135 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 136 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 137 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 138 #define _TIF_IRET               (1<<TIF_IRET)
 139 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 140 #define _TIF_FREEZE             (1<<TIF_FREEZE)
 141 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 142 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 143 #define _TIF_KERNEL_TRACE       (1 << TIF_KERNEL_TRACE)
 144
 145 /* work to do in syscall trace */
 146 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 147                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
 148
 149 /* work to do on interrupt/exception return */
 150 #define _TIF_WORK_MASK          0x0000FFFE
 151
 152 /* work to do on any return to u-space */
 153 #define _TIF_ALLWORK_MASK       0x0000FFFF
 154
 155 /*
 156  * Thread-synchronous status.
 157  *
 158  * This is different from the flags in that nobody else
 159  * ever touches our thread-synchronous status, so we don't
 160  * have to worry about atomic accesses.
 161  */
 162 /* FPU was used by this task this quantum (SMP) */
 163 #define TS_USEDFPU              0x0001
 164 #define TS_RESTORE_SIGMASK      0x0002
 165
 166 #ifndef __ASSEMBLY__
 167 #define HAVE_SET_RESTORE_SIGMASK 1
 168 static inline void set_restore_sigmask(void)
 169 {
 170         struct thread_info *ti = current_thread_info();
 171         ti->status |= TS_RESTORE_SIGMASK;
 172         set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
 173 }
 174 #endif
 175
 176 #endif /* __KERNEL__ */
 177 #endif /* _ASM_MICROBLAZE_THREAD_INFO_H */