arch/hexagon/include/asm/thread_info.h

   1 /*
   2  * Thread support for the Hexagon architecture
   3  *
   4  * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 and
   8  * only version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA.
  19  */
  20
  21 #ifndef _ASM_THREAD_INFO_H
  22 #define _ASM_THREAD_INFO_H
  23
  24 #ifdef __KERNEL__
  25
  26 #ifndef __ASSEMBLY__
  27 #include <asm/processor.h>
  28 #include <asm/registers.h>
  29 #include <asm/page.h>
  30 #endif
  31
  32 #define THREAD_SHIFT            12
  33 #define THREAD_SIZE             (1<<THREAD_SHIFT)
  34
  35 #if THREAD_SHIFT >= PAGE_SHIFT
  36 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  37 #else  /*  don't use standard allocator  */
  38 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  39 extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node);
  40 extern void free_thread_info(struct thread_info *ti);
  41 #endif
  42
  43
  44 #ifndef __ASSEMBLY__
  45
  46 typedef struct {
  47         unsigned long seg;
  48 } mm_segment_t;
  49
  50 /*
  51  * This is union'd with the "bottom" of the kernel stack.
  52  * It keeps track of thread info which is handy for routines
  53  * to access quickly.
  54  */
  55
  56 struct thread_info {
  57         struct task_struct      *task;          /* main task structure */
  58         struct exec_domain      *exec_domain;   /* execution domain */
  59         unsigned long           flags;          /* low level flags */
  60         __u32                   cpu;            /* current cpu */
  61         int                     preempt_count;  /* 0=>preemptible,<0=>BUG */
  62         mm_segment_t            addr_limit;     /* segmentation sux */
  63         /*
  64          * used for syscalls somehow;
  65          * seems to have a function pointer and four arguments
  66          */
  67         struct restart_block    restart_block;
  68         /* Points to the current pt_regs frame  */
  69         struct pt_regs          *regs;
  70         /*
  71          * saved kernel sp at switch_to time;
  72          * not sure if this is used (it's not in the VM model it seems;
  73          * see thread_struct)
  74          */
  75         unsigned long           sp;
  76 };
  77
  78 #else /* !__ASSEMBLY__ */
  79
  80 #include <asm/asm-offsets.h>
  81
  82 #endif  /* __ASSEMBLY__  */
  83
  84 /*  looks like "linux/hardirq.h" uses this.  */
  85
  86 #define PREEMPT_ACTIVE          0x10000000
  87
  88 #ifndef __ASSEMBLY__
  89
  90 #define INIT_THREAD_INFO(tsk)                   \
  91 {                                               \
  92         .task           = &tsk,                 \
  93         .exec_domain    = &default_exec_domain, \
  94         .flags          = 0,                    \
  95         .cpu            = 0,                    \
  96         .preempt_count  = 1,                    \
  97         .addr_limit     = KERNEL_DS,            \
  98         .restart_block = {                      \
  99                 .fn = do_no_restart_syscall,    \
 100         },                                      \
 101         .sp = 0,                                \
 102         .regs = NULL,                   \
 103 }
 104
 105 #define init_thread_info        (init_thread_union.thread_info)
 106 #define init_stack              (init_thread_union.stack)
 107
 108 /* Tacky preprocessor trickery */
 109 #define qqstr(s) qstr(s)
 110 #define qstr(s) #s
 111 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
 112
 113 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 114 #define current_thread_info()  __current_thread_info
 115
 116 #endif /* __ASSEMBLY__ */
 117
 118 /*
 119  * thread information flags
 120  * - these are process state flags that various assembly files
 121  *   may need to access
 122  * - pending work-to-be-done flags are in LSW
 123  * - other flags in MSW
 124  */
 125
 126 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 127 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 128 #define TIF_SIGPENDING          2       /* signal pending */
 129 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 130 #define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
 131 #define TIF_IRET                5       /* return with iret */
 132 #define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
 133 /* true if poll_idle() is polling TIF_NEED_RESCHED */
 134 #define TIF_POLLING_NRFLAG      16
 135 #define TIF_MEMDIE              17      /* OOM killer killed process */
 136
 137 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 138 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 139 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 140 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 141 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 142 #define _TIF_IRET               (1 << TIF_IRET)
 143 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 144 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 145
 146 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
 147 #define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
 148
 149 /* work to do on any return to u-space */
 150 #define _TIF_ALLWORK_MASK       0x0000FFFF
 151
 152 #endif /* __KERNEL__ */
 153
 154 #endif