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   1 #ifndef _ASM_M32R_THREAD_INFO_H
   2 #define _ASM_M32R_THREAD_INFO_H
   3
   4 /* thread_info.h: m32r low-level thread information
   5  *
   6  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   7  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   8  * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
   9  */
  10
  11 #ifdef __KERNEL__
  12
  13 #ifndef __ASSEMBLY__
  14 #include <asm/processor.h>
  15 #endif
  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 must also be changed
  22  */
  23 #ifndef __ASSEMBLY__
  24
  25 struct thread_info {
  26         struct task_struct      *task;          /* main task structure */
  27         struct exec_domain      *exec_domain;   /* execution domain */
  28         unsigned long           flags;          /* low level flags */
  29         unsigned long           status;         /* thread-synchronous flags */
  30         __u32                   cpu;            /* current CPU */
  31         __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */
  32
  33         mm_segment_t            addr_limit;     /* thread address space:
  34                                                    0-0xBFFFFFFF for user-thread
  35                                                    0-0xFFFFFFFF for kernel-thread
  36                                                 */
  37         struct restart_block    restart_block;
  38
  39         __u8                    supervisor_stack[0];
  40 };
  41
  42 #else /* !__ASSEMBLY__ */
  43
  44 /* offsets into the thread_info struct for assembly code access */
  45 #define TI_TASK         0x00000000
  46 #define TI_EXEC_DOMAIN  0x00000004
  47 #define TI_FLAGS        0x00000008
  48 #define TI_STATUS       0x0000000C
  49 #define TI_CPU          0x00000010
  50 #define TI_PRE_COUNT    0x00000014
  51 #define TI_ADDR_LIMIT   0x00000018
  52 #define TI_RESTART_BLOCK 0x000001C
  53
  54 #endif
  55
  56 #define PREEMPT_ACTIVE          0x10000000
  57
  58 /*
  59  * macros/functions for gaining access to the thread information structure
  60  *
  61  * preempt_count needs to be 1 initially, until the scheduler is functional.
  62  */
  63 #ifndef __ASSEMBLY__
  64
  65 #define INIT_THREAD_INFO(tsk)                   \
  66 {                                               \
  67         .task           = &tsk,                 \
  68         .exec_domain    = &default_exec_domain, \
  69         .flags          = 0,                    \
  70         .cpu            = 0,                    \
  71         .preempt_count  = 1,                    \
  72         .addr_limit     = KERNEL_DS,            \
  73         .restart_block = {                      \
  74                 .fn = do_no_restart_syscall,    \
  75         },                                      \
  76 }
  77
  78 #define init_thread_info        (init_thread_union.thread_info)
  79 #define init_stack              (init_thread_union.stack)
  80
  81 #define THREAD_SIZE (2*PAGE_SIZE)
  82
  83 /* how to get the thread information struct from C */
  84 static inline struct thread_info *current_thread_info(void)
  85 {
  86         struct thread_info *ti;
  87
  88         __asm__ __volatile__ (
  89                 "ldi    %0, #%1                 \n\t"
  90                 "and    %0, sp                  \n\t"
  91                 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
  92         );
  93
  94         return ti;
  95 }
  96
  97 /* thread information allocation */
  98 #if CONFIG_DEBUG_STACK_USAGE
  99 #define alloc_thread_info(tsk)                                  \
 100         ({                                                      \
 101                 struct thread_info *ret;                        \
 102                                                                 \
 103                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
 104                 if (ret)                                        \
 105                         memset(ret, 0, THREAD_SIZE);            \
 106                 ret;                                            \
 107          })
 108 #else
 109 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
 110 #endif
 111
 112 #define free_thread_info(info) kfree(info)
 113 #define get_thread_info(ti) get_task_struct((ti)->task)
 114 #define put_thread_info(ti) put_task_struct((ti)->task)
 115
 116 #define TI_FLAG_FAULT_CODE_SHIFT        28
 117
 118 static inline void set_thread_fault_code(unsigned int val)
 119 {
 120         struct thread_info *ti = current_thread_info();
 121         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
 122                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
 123 }
 124
 125 static inline unsigned int get_thread_fault_code(void)
 126 {
 127         struct thread_info *ti = current_thread_info();
 128         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
 129 }
 130
 131 #else /* !__ASSEMBLY__ */
 132
 133 #define THREAD_SIZE     8192
 134
 135 /* how to get the thread information struct from ASM */
 136 #define GET_THREAD_INFO(reg)    GET_THREAD_INFO reg
 137         .macro GET_THREAD_INFO reg
 138         ldi     \reg, #-THREAD_SIZE
 139         and     \reg, sp
 140         .endm
 141
 142 #endif
 143
 144 /*
 145  * thread information flags
 146  * - these are process state flags that various assembly files may need to access
 147  * - pending work-to-be-done flags are in LSW
 148  * - other flags in MSW
 149  */
 150 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 151 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 152 #define TIF_SIGPENDING          2       /* signal pending */
 153 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 154 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
 155 #define TIF_IRET                5       /* return with iret */
 156 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 157                                         /* 31..28 fault code */
 158 #define TIF_MEMDIE              17
 159
 160 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 161 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 162 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 163 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 164 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 165 #define _TIF_IRET               (1<<TIF_IRET)
 166 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 167
 168 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 169 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 170
 171 /*
 172  * Thread-synchronous status.
 173  *
 174  * This is different from the flags in that nobody else
 175  * ever touches our thread-synchronous status, so we don't
 176  * have to worry about atomic accesses.
 177  */
 178 #define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 179
 180 #endif /* __KERNEL__ */
 181
 182 #endif /* _ASM_M32R_THREAD_INFO_H */