LXR linux/arch/m32r/include/asm/thread

   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
  25struct 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        int                     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#define THREAD_SIZE (PAGE_SIZE << 1)
  59
  60/*
  61 * macros/functions for gaining access to the thread information structure
  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  = INIT_PREEMPT_COUNT,   \
  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/* how to get the thread information struct from C */
  82static inline struct thread_info *current_thread_info(void)
  83{
  84        struct thread_info *ti;
  85
  86        __asm__ __volatile__ (
  87                "ldi    %0, #%1                 \n\t"
  88                "and    %0, sp                  \n\t"
  89                : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
  90        );
  91
  92        return ti;
  93}
  94
  95#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  96
  97/* thread information allocation */
  98#ifdef CONFIG_DEBUG_STACK_USAGE
  99#define alloc_thread_info(tsk)                                  \
 100        ({                                                      \
 101                struct thread_info *ret;                        \
 102                                                                \
 103                ret = kzalloc(THREAD_SIZE, GFP_KERNEL);         \
 104                                                                \
 105                ret;                                            \
 106         })
 107#else
 108#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
 109#endif
 110
 111#define free_thread_info(info) kfree(info)
 112
 113#define TI_FLAG_FAULT_CODE_SHIFT        28
 114
 115static inline void set_thread_fault_code(unsigned int val)
 116{
 117        struct thread_info *ti = current_thread_info();
 118        ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
 119                | (val << TI_FLAG_FAULT_CODE_SHIFT);
 120}
 121
 122static inline unsigned int get_thread_fault_code(void)
 123{
 124        struct thread_info *ti = current_thread_info();
 125        return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
 126}
 127
 128#endif
 129
 130/*
 131 * thread information flags
 132 * - these are process state flags that various assembly files may need to access
 133 * - pending work-to-be-done flags are in LSW
 134 * - other flags in MSW
 135 */
 136#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 137#define TIF_SIGPENDING          1       /* signal pending */
 138#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 139#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 140#define TIF_IRET                4       /* return with iret */
 141#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
 142#define TIF_RESTORE_SIGMASK     8       /* restore signal mask in do_signal() */
 143#define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 144#define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 145#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 146#define TIF_FREEZE              19      /* is freezing for suspend */
 147
 148#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 149#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 150#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 151#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 152#define _TIF_IRET               (1<<TIF_IRET)
 153#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 154#define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 155#define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 156#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 157#define _TIF_FREEZE             (1<<TIF_FREEZE)
 158
 159#define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 160#define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 161
 162/*
 163 * Thread-synchronous status.
 164 *
 165 * This is different from the flags in that nobody else
 166 * ever touches our thread-synchronous status, so we don't
 167 * have to worry about atomic accesses.
 168 */
 169#define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 170
 171#endif /* __KERNEL__ */
 172
 173#endif /* _ASM_M32R_THREAD_INFO_H */
 174