arch/mips/include/asm/thread_info.h

   1 /* thread_info.h: MIPS low-level thread information
   2  *
   3  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   4  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   5  */
   6
   7 #ifndef _ASM_THREAD_INFO_H
   8 #define _ASM_THREAD_INFO_H
   9
  10 #ifdef __KERNEL__
  11
  12
  13 #ifndef __ASSEMBLY__
  14
  15 #include <asm/processor.h>
  16
  17 /*
  18  * low level task data that entry.S needs immediate access to
  19  * - this struct should fit entirely inside of one cache line
  20  * - this struct shares the supervisor stack pages
  21  * - if the contents of this structure are changed, the assembly constants
  22  *   must also be changed
  23  */
  24 struct thread_info {
  25         struct task_struct      *task;          /* main task structure */
  26         struct exec_domain      *exec_domain;   /* execution domain */
  27         unsigned long           flags;          /* low level flags */
  28         unsigned long           tp_value;       /* thread pointer */
  29         __u32                   cpu;            /* current CPU */
  30         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  31
  32         mm_segment_t            addr_limit;     /*
  33                                                  * thread address space limit:
  34                                                  * 0x7fffffff for user-thead
  35                                                  * 0xffffffff for kernel-thread
  36                                                  */
  37         struct restart_block    restart_block;
  38         struct pt_regs          *regs;
  39 };
  40
  41 /*
  42  * macros/functions for gaining access to the thread information structure
  43  */
  44 #define INIT_THREAD_INFO(tsk)                   \
  45 {                                               \
  46         .task           = &tsk,                 \
  47         .exec_domain    = &default_exec_domain, \
  48         .flags          = _TIF_FIXADE,          \
  49         .cpu            = 0,                    \
  50         .preempt_count  = INIT_PREEMPT_COUNT,   \
  51         .addr_limit     = KERNEL_DS,            \
  52         .restart_block  = {                     \
  53                 .fn = do_no_restart_syscall,    \
  54         },                                      \
  55 }
  56
  57 #define init_thread_info        (init_thread_union.thread_info)
  58 #define init_stack              (init_thread_union.stack)
  59
  60 /* How to get the thread information struct from C.  */
  61 static inline struct thread_info *current_thread_info(void)
  62 {
  63         register struct thread_info *__current_thread_info __asm__("$28");
  64
  65         return __current_thread_info;
  66 }
  67
  68 #endif /* !__ASSEMBLY__ */
  69
  70 /* thread information allocation */
  71 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
  72 #define THREAD_SIZE_ORDER (1)
  73 #endif
  74 #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
  75 #define THREAD_SIZE_ORDER (2)
  76 #endif
  77 #ifdef CONFIG_PAGE_SIZE_8KB
  78 #define THREAD_SIZE_ORDER (1)
  79 #endif
  80 #ifdef CONFIG_PAGE_SIZE_16KB
  81 #define THREAD_SIZE_ORDER (0)
  82 #endif
  83 #ifdef CONFIG_PAGE_SIZE_32KB
  84 #define THREAD_SIZE_ORDER (0)
  85 #endif
  86 #ifdef CONFIG_PAGE_SIZE_64KB
  87 #define THREAD_SIZE_ORDER (0)
  88 #endif
  89
  90 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
  91 #define THREAD_MASK (THREAD_SIZE - 1UL)
  92
  93 #define STACK_WARN      (THREAD_SIZE / 8)
  94
  95 #define PREEMPT_ACTIVE          0x10000000
  96
  97 /*
  98  * thread information flags
  99  * - these are process state flags that various assembly files may need to
 100  *   access
 101  * - pending work-to-be-done flags are in LSW
 102  * - other flags in MSW
 103  */
 104 #define TIF_SIGPENDING          1       /* signal pending */
 105 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 106 #define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
 107 #define TIF_SECCOMP             4       /* secure computing */
 108 #define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
 109 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
 110 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 111 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 112 #define TIF_FIXADE              20      /* Fix address errors in software */
 113 #define TIF_LOGADE              21      /* Log address errors to syslog */
 114 #define TIF_32BIT_REGS          22      /* also implies 16/32 fprs */
 115 #define TIF_32BIT_ADDR          23      /* 32-bit address space (o32/n32) */
 116 #define TIF_FPUBOUND            24      /* thread bound to FPU-full CPU set */
 117 #define TIF_LOAD_WATCH          25      /* If set, load watch registers */
 118 #define TIF_SYSCALL_TRACE       31      /* syscall trace active */
 119
 120 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 121 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 122 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 123 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 124 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 125 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 126 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 127 #define _TIF_FIXADE             (1<<TIF_FIXADE)
 128 #define _TIF_LOGADE             (1<<TIF_LOGADE)
 129 #define _TIF_32BIT_REGS         (1<<TIF_32BIT_REGS)
 130 #define _TIF_32BIT_ADDR         (1<<TIF_32BIT_ADDR)
 131 #define _TIF_FPUBOUND           (1<<TIF_FPUBOUND)
 132 #define _TIF_LOAD_WATCH         (1<<TIF_LOAD_WATCH)
 133
 134 #define _TIF_WORK_SYSCALL_ENTRY (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
 135
 136 /* work to do in syscall_trace_leave() */
 137 #define _TIF_WORK_SYSCALL_EXIT  (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
 138
 139 /* work to do on interrupt/exception return */
 140 #define _TIF_WORK_MASK          \
 141         (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 142 /* work to do on any return to u-space */
 143 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
 144
 145 #endif /* __KERNEL__ */
 146
 147 #endif /* _ASM_THREAD_INFO_H */