arch/xtensa/include/asm/thread_info.h

   1 /*
   2  * include/asm-xtensa/thread_info.h
   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  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_THREAD_INFO_H
  12 #define _XTENSA_THREAD_INFO_H
  13
  14 #ifdef __KERNEL__
  15
  16 #ifndef __ASSEMBLY__
  17 # include <asm/processor.h>
  18 #endif
  19
  20 /*
  21  * low level task data that entry.S needs immediate access to
  22  * - this struct should fit entirely inside of one cache line
  23  * - this struct shares the supervisor stack pages
  24  * - if the contents of this structure are changed, the assembly constants
  25  *   must also be changed
  26  */
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #if XTENSA_HAVE_COPROCESSORS
  31
  32 typedef struct xtregs_coprocessor {
  33         xtregs_cp0_t cp0;
  34         xtregs_cp1_t cp1;
  35         xtregs_cp2_t cp2;
  36         xtregs_cp3_t cp3;
  37         xtregs_cp4_t cp4;
  38         xtregs_cp5_t cp5;
  39         xtregs_cp6_t cp6;
  40         xtregs_cp7_t cp7;
  41 } xtregs_coprocessor_t;
  42
  43 #endif
  44
  45 struct thread_info {
  46         struct task_struct      *task;          /* main task structure */
  47         unsigned long           flags;          /* low level flags */
  48         unsigned long           status;         /* thread-synchronous flags */
  49         __u32                   cpu;            /* current CPU */
  50         __s32                   preempt_count;  /* 0 => preemptable,< 0 => BUG*/
  51
  52         mm_segment_t            addr_limit;     /* thread address space */
  53
  54         unsigned long           cpenable;
  55
  56         /* Allocate storage for extra user states and coprocessor states. */
  57 #if XTENSA_HAVE_COPROCESSORS
  58         xtregs_coprocessor_t    xtregs_cp;
  59 #endif
  60         xtregs_user_t           xtregs_user;
  61 };
  62
  63 #endif
  64
  65 /*
  66  * macros/functions for gaining access to the thread information structure
  67  */
  68
  69 #ifndef __ASSEMBLY__
  70
  71 #define INIT_THREAD_INFO(tsk)                   \
  72 {                                               \
  73         .task           = &tsk,                 \
  74         .flags          = 0,                    \
  75         .cpu            = 0,                    \
  76         .preempt_count  = INIT_PREEMPT_COUNT,   \
  77         .addr_limit     = KERNEL_DS,            \
  78 }
  79
  80 #define init_thread_info        (init_thread_union.thread_info)
  81 #define init_stack              (init_thread_union.stack)
  82
  83 /* how to get the thread information struct from C */
  84 static inline struct thread_info *current_thread_info(void)
  85 {
  86         struct thread_info *ti;
  87          __asm__("extui %0,a1,0,13\n\t"
  88                  "xor %0, a1, %0" : "=&r" (ti) : );
  89         return ti;
  90 }
  91
  92 #else /* !__ASSEMBLY__ */
  93
  94 /* how to get the thread information struct from ASM */
  95 #define GET_THREAD_INFO(reg,sp) \
  96         extui reg, sp, 0, 13; \
  97         xor   reg, sp, reg
  98 #endif
  99
 100
 101 /*
 102  * thread information flags
 103  * - these are process state flags that various assembly files may need to access
 104  * - pending work-to-be-done flags are in LSW
 105  * - other flags in MSW
 106  */
 107 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 108 #define TIF_SIGPENDING          1       /* signal pending */
 109 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 110 #define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 111 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
 112 #define TIF_RESTORE_SIGMASK     6       /* restore signal mask in do_signal() */
 113 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 114
 115 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 116 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 117 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 118 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 119
 120 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 121 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 122
 123 /*
 124  * Thread-synchronous status.
 125  *
 126  * This is different from the flags in that nobody else
 127  * ever touches our thread-synchronous status, so we don't
 128  * have to worry about atomic accesses.
 129  */
 130 #define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 131
 132 #define THREAD_SIZE 8192        //(2*PAGE_SIZE)
 133 #define THREAD_SIZE_ORDER 1
 134
 135 #endif  /* __KERNEL__ */
 136 #endif  /* _XTENSA_THREAD_INFO */