include/asm-sh/thread_info.h

   1 #ifndef __ASM_SH_THREAD_INFO_H
   2 #define __ASM_SH_THREAD_INFO_H
   3
   4 /* SuperH version
   5  * Copyright (C) 2002  Niibe Yutaka
   6  *
   7  * The copyright of original i386 version is:
   8  *
   9  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
  10  *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
  11  */
  12 #ifdef __KERNEL__
  13 #include <asm/page.h>
  14
  15 #ifndef __ASSEMBLY__
  16 #include <asm/processor.h>
  17
  18 struct thread_info {
  19         struct task_struct      *task;          /* main task structure */
  20         struct exec_domain      *exec_domain;   /* execution domain */
  21         unsigned long           flags;          /* low level flags */
  22         __u32                   cpu;
  23         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  24         mm_segment_t            addr_limit;     /* thread address space */
  25         struct restart_block    restart_block;
  26         unsigned long           previous_sp;    /* sp of previous stack in case
  27                                                    of nested IRQ stacks */
  28         __u8                    supervisor_stack[0];
  29 };
  30
  31 #endif
  32
  33 #define PREEMPT_ACTIVE          0x10000000
  34
  35 #ifdef CONFIG_4KSTACKS
  36 #define THREAD_SIZE             (PAGE_SIZE)
  37 #else
  38 #define THREAD_SIZE             (PAGE_SIZE * 2)
  39 #endif
  40 #define STACK_WARN              (THREAD_SIZE / 8)
  41
  42 /*
  43  * macros/functions for gaining access to the thread information structure
  44  */
  45 #ifndef __ASSEMBLY__
  46 #define INIT_THREAD_INFO(tsk)                   \
  47 {                                               \
  48         .task           = &tsk,                 \
  49         .exec_domain    = &default_exec_domain, \
  50         .flags          = 0,                    \
  51         .cpu            = 0,                    \
  52         .preempt_count  = 1,                    \
  53         .addr_limit     = KERNEL_DS,            \
  54         .restart_block  = {                     \
  55                 .fn = do_no_restart_syscall,    \
  56         },                                      \
  57 }
  58
  59 #define init_thread_info        (init_thread_union.thread_info)
  60 #define init_stack              (init_thread_union.stack)
  61
  62 /* how to get the current stack pointer from C */
  63 register unsigned long current_stack_pointer asm("r15") __attribute_used__;
  64
  65 /* how to get the thread information struct from C */
  66 static inline struct thread_info *current_thread_info(void)
  67 {
  68         struct thread_info *ti;
  69 #ifdef CONFIG_CPU_HAS_SR_RB
  70         __asm__("stc    r7_bank, %0" : "=r" (ti));
  71 #else
  72         unsigned long __dummy;
  73
  74         __asm__ __volatile__ (
  75                 "mov    r15, %0\n\t"
  76                 "and    %1, %0\n\t"
  77                 : "=&r" (ti), "=r" (__dummy)
  78                 : "1" (~(THREAD_SIZE - 1))
  79                 : "memory");
  80 #endif
  81
  82         return ti;
  83 }
  84
  85 /* thread information allocation */
  86 #ifdef CONFIG_DEBUG_STACK_USAGE
  87 #define alloc_thread_info(ti)   kzalloc(THREAD_SIZE, GFP_KERNEL)
  88 #else
  89 #define alloc_thread_info(ti)   kmalloc(THREAD_SIZE, GFP_KERNEL)
  90 #endif
  91 #define free_thread_info(ti)    kfree(ti)
  92
  93 #else /* !__ASSEMBLY__ */
  94
  95 /* how to get the thread information struct from ASM */
  96 #define GET_THREAD_INFO(reg) \
  97         stc     r7_bank, reg
  98
  99 #endif
 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_NOTIFY_RESUME       1       /* resumption notification requested */
 109 #define TIF_SIGPENDING          2       /* signal pending */
 110 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 111 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 112 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 113 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 114 #define TIF_MEMDIE              18
 115
 116 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 117 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 118 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 119 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 120 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 121 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 122 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 123
 124 #define _TIF_WORK_MASK          0x000000FE      /* work to do on interrupt/exception return */
 125 #define _TIF_ALLWORK_MASK       0x000000FF      /* work to do on any return to u-space */
 126
 127 #endif /* __KERNEL__ */
 128
 129 #endif /* __ASM_SH_THREAD_INFO_H */