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_16KB)
  42 #define THREAD_SIZE_ORDER       (0)
  43 #elif defined(CONFIG_PAGE_SIZE_64KB)
  44 #define THREAD_SIZE_ORDER       (0)
  45 #else
  46 #error "Unknown thread size"
  47 #endif
  48
  49 #define THREAD_SIZE     (PAGE_SIZE << THREAD_SIZE_ORDER)
  50 #define STACK_WARN      (THREAD_SIZE >> 3)
  51
  52 /*
  53  * macros/functions for gaining access to the thread information structure
  54  */
  55 #ifndef __ASSEMBLY__
  56 #define INIT_THREAD_INFO(tsk)                   \
  57 {                                               \
  58         .task           = &tsk,                 \
  59         .exec_domain    = &default_exec_domain, \
  60         .flags          = 0,                    \
  61         .cpu            = 0,                    \
  62         .preempt_count  = 1,                    \
  63         .addr_limit     = KERNEL_DS,            \
  64         .restart_block  = {                     \
  65                 .fn = do_no_restart_syscall,    \
  66         },                                      \
  67 }
  68
  69 #define init_thread_info        (init_thread_union.thread_info)
  70 #define init_stack              (init_thread_union.stack)
  71
  72 /* how to get the current stack pointer from C */
  73 register unsigned long current_stack_pointer asm("r15") __used;
  74
  75 /* how to get the thread information struct from C */
  76 static inline struct thread_info *current_thread_info(void)
  77 {
  78         struct thread_info *ti;
  79 #if defined(CONFIG_SUPERH64)
  80         __asm__ __volatile__ ("getcon   cr17, %0" : "=r" (ti));
  81 #elif defined(CONFIG_CPU_HAS_SR_RB)
  82         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
  83 #else
  84         unsigned long __dummy;
  85
  86         __asm__ __volatile__ (
  87                 "mov    r15, %0\n\t"
  88                 "and    %1, %0\n\t"
  89                 : "=&r" (ti), "=r" (__dummy)
  90                 : "1" (~(THREAD_SIZE - 1))
  91                 : "memory");
  92 #endif
  93
  94         return ti;
  95 }
  96
  97 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  98
  99 /* thread information allocation */
 100 #ifdef CONFIG_DEBUG_STACK_USAGE
 101 #define alloc_thread_info(ti)   kzalloc(THREAD_SIZE, GFP_KERNEL)
 102 #else
 103 #define alloc_thread_info(ti)   kmalloc(THREAD_SIZE, GFP_KERNEL)
 104 #endif
 105 #define free_thread_info(ti)    kfree(ti)
 106
 107 #endif /* __ASSEMBLY__ */
 108
 109 /*
 110  * thread information flags
 111  * - these are process state flags that various assembly files may need to access
 112  * - pending work-to-be-done flags are in LSW
 113  * - other flags in MSW
 114  */
 115 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 116 #define TIF_SIGPENDING          1       /* signal pending */
 117 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 118 #define TIF_RESTORE_SIGMASK     3       /* restore signal mask in do_signal() */
 119 #define TIF_SINGLESTEP          4       /* singlestepping active */
 120 #define TIF_SYSCALL_AUDIT       5
 121 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 122 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 123 #define TIF_MEMDIE              18
 124 #define TIF_FREEZE              19
 125
 126 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 127 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 128 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 129 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 130 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 131 #define _TIF_SYSCALL_AUDIT              (1<<TIF_SYSCALL_AUDIT)
 132 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 133 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 134 #define _TIF_FREEZE             (1<<TIF_FREEZE)
 135
 136 #define _TIF_WORK_MASK          0x000000FE      /* work to do on interrupt/exception return */
 137 #define _TIF_ALLWORK_MASK       0x000000FF      /* work to do on any return to u-space */
 138
 139 #endif /* __KERNEL__ */
 140
 141 #endif /* __ASM_SH_THREAD_INFO_H */