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 #if defined(CONFIG_4KSTACKS)
  36 #define THREAD_SIZE_ORDER       (0)
  37 #elif defined(CONFIG_PAGE_SIZE_4KB)
  38 #define THREAD_SIZE_ORDER       (1)
  39 #elif defined(CONFIG_PAGE_SIZE_8KB)
  40 #define THREAD_SIZE_ORDER       (1)
  41 #elif defined(CONFIG_PAGE_SIZE_64KB)
  42 #define THREAD_SIZE_ORDER       (0)
  43 #else
  44 #error "Unknown thread size"
  45 #endif
  46
  47 #define THREAD_SIZE     (PAGE_SIZE << THREAD_SIZE_ORDER)
  48 #define STACK_WARN      (THREAD_SIZE >> 3)
  49
  50 /*
  51  * macros/functions for gaining access to the thread information structure
  52  */
  53 #ifndef __ASSEMBLY__
  54 #define INIT_THREAD_INFO(tsk)                   \
  55 {                                               \
  56         .task           = &tsk,                 \
  57         .exec_domain    = &default_exec_domain, \
  58         .flags          = 0,                    \
  59         .cpu            = 0,                    \
  60         .preempt_count  = 1,                    \
  61         .addr_limit     = KERNEL_DS,            \
  62         .restart_block  = {                     \
  63                 .fn = do_no_restart_syscall,    \
  64         },                                      \
  65 }
  66
  67 #define init_thread_info        (init_thread_union.thread_info)
  68 #define init_stack              (init_thread_union.stack)
  69
  70 /* how to get the current stack pointer from C */
  71 register unsigned long current_stack_pointer asm("r15") __attribute_used__;
  72
  73 /* how to get the thread information struct from C */
  74 static inline struct thread_info *current_thread_info(void)
  75 {
  76         struct thread_info *ti;
  77 #ifdef CONFIG_CPU_HAS_SR_RB
  78         __asm__("stc    r7_bank, %0" : "=r" (ti));
  79 #else
  80         unsigned long __dummy;
  81
  82         __asm__ __volatile__ (
  83                 "mov    r15, %0\n\t"
  84                 "and    %1, %0\n\t"
  85                 : "=&r" (ti), "=r" (__dummy)
  86                 : "1" (~(THREAD_SIZE - 1))
  87                 : "memory");
  88 #endif
  89
  90         return ti;
  91 }
  92
  93 /* thread information allocation */
  94 #ifdef CONFIG_DEBUG_STACK_USAGE
  95 #define alloc_thread_info(ti)   kzalloc(THREAD_SIZE, GFP_KERNEL)
  96 #else
  97 #define alloc_thread_info(ti)   kmalloc(THREAD_SIZE, GFP_KERNEL)
  98 #endif
  99 #define free_thread_info(ti)    kfree(ti)
 100
 101 #endif /* __ASSEMBLY__ */
 102
 103 /*
 104  * thread information flags
 105  * - these are process state flags that various assembly files may need to access
 106  * - pending work-to-be-done flags are in LSW
 107  * - other flags in MSW
 108  */
 109 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 110 #define TIF_SIGPENDING          1       /* signal pending */
 111 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 112 #define TIF_RESTORE_SIGMASK     3       /* restore signal mask in do_signal() */
 113 #define TIF_SINGLESTEP          4       /* singlestepping active */
 114 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 115 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 116 #define TIF_MEMDIE              18
 117 #define TIF_FREEZE              19
 118
 119 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 120 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 121 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 122 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 123 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 124 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 125 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 126 #define _TIF_FREEZE             (1<<TIF_FREEZE)
 127
 128 #define _TIF_WORK_MASK          0x000000FE      /* work to do on interrupt/exception return */
 129 #define _TIF_ALLWORK_MASK       0x000000FF      /* work to do on any return to u-space */
 130
 131 #endif /* __KERNEL__ */
 132
 133 #endif /* __ASM_SH_THREAD_INFO_H */