LXR linux/arch/microblaze/include/asm/thread

   1/*
   2 * Copyright (C) 2006 Atmark Techno, Inc.
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License. See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 */
   8
   9#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
  10#define _ASM_MICROBLAZE_THREAD_INFO_H
  11
  12#ifdef __KERNEL__
  13
  14/* we have 8k stack */
  15#define THREAD_SHIFT            13
  16#define THREAD_SIZE             (1 << THREAD_SHIFT)
  17#define THREAD_SIZE_ORDER       1
  18
  19#ifndef __ASSEMBLY__
  20# include <linux/types.h>
  21# include <asm/processor.h>
  22
  23/*
  24 * low level task data that entry.S needs immediate access to
  25 * - this struct should fit entirely inside of one cache line
  26 * - this struct shares the supervisor stack pages
  27 * - if the contents of this structure are changed, the assembly constants
  28 *       must also be changed
  29 */
  30
  31struct cpu_context {
  32        __u32   r1; /* stack pointer */
  33        __u32   r2;
  34        /* dedicated registers */
  35        __u32   r13;
  36        __u32   r14;
  37        __u32   r15;
  38        __u32   r16;
  39        __u32   r17;
  40        __u32   r18;
  41        /* non-volatile registers */
  42        __u32   r19;
  43        __u32   r20;
  44        __u32   r21;
  45        __u32   r22;
  46        __u32   r23;
  47        __u32   r24;
  48        __u32   r25;
  49        __u32   r26;
  50        __u32   r27;
  51        __u32   r28;
  52        __u32   r29;
  53        __u32   r30;
  54        /* r31 is used as current task pointer */
  55        /* special purpose registers */
  56        __u32   msr;
  57        __u32   ear;
  58        __u32   esr;
  59        __u32   fsr;
  60};
  61
  62typedef struct {
  63        unsigned long seg;
  64} mm_segment_t;
  65
  66struct thread_info {
  67        struct task_struct      *task; /* main task structure */
  68        unsigned long           flags; /* low level flags */
  69        unsigned long           status; /* thread-synchronous flags */
  70        __u32                   cpu; /* current CPU */
  71        __s32                   preempt_count; /* 0 => preemptable,< 0 => BUG*/
  72        mm_segment_t            addr_limit; /* thread address space */
  73
  74        struct cpu_context      cpu_context;
  75};
  76
  77/*
  78 * macros/functions for gaining access to the thread information structure
  79 */
  80#define INIT_THREAD_INFO(tsk)                   \
  81{                                               \
  82        .task           = &tsk,                 \
  83        .flags          = 0,                    \
  84        .cpu            = 0,                    \
  85        .preempt_count  = INIT_PREEMPT_COUNT,   \
  86        .addr_limit     = KERNEL_DS,            \
  87}
  88
  89#define init_thread_info        (init_thread_union.thread_info)
  90#define init_stack              (init_thread_union.stack)
  91
  92/* how to get the thread information struct from C */
  93static inline struct thread_info *current_thread_info(void)
  94{
  95        register unsigned long sp asm("r1");
  96
  97        return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
  98}
  99
 100/* thread information allocation */
 101#endif /* __ASSEMBLY__ */
 102
 103/*
 104 * thread information flags
 105 * - these are process state flags that various assembly files may
 106 *   need to access
 107 * - pending work-to-be-done flags are in LSW
 108 * - other flags in MSW
 109 */
 110#define TIF_SYSCALL_TRACE       0 /* syscall trace active */
 111#define TIF_NOTIFY_RESUME       1 /* resumption notification requested */
 112#define TIF_SIGPENDING          2 /* signal pending */
 113#define TIF_NEED_RESCHED        3 /* rescheduling necessary */
 114/* restore singlestep on return to user mode */
 115#define TIF_SINGLESTEP          4
 116#define TIF_MEMDIE              6       /* is terminating due to OOM killer */
 117#define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
 118#define TIF_SECCOMP             10      /* secure computing */
 119
 120/* true if poll_idle() is polling TIF_NEED_RESCHED */
 121#define TIF_POLLING_NRFLAG      16
 122
 123#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 124#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 125#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 126#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 127#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 128#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 129#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 130#define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 131
 132/* work to do in syscall trace */
 133#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 134                                 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
 135
 136/* work to do on interrupt/exception return */
 137#define _TIF_WORK_MASK          0x0000FFFE
 138
 139/* work to do on any return to u-space */
 140#define _TIF_ALLWORK_MASK       0x0000FFFF
 141
 142/*
 143 * Thread-synchronous status.
 144 *
 145 * This is different from the flags in that nobody else
 146 * ever touches our thread-synchronous status, so we don't
 147 * have to worry about atomic accesses.
 148 */
 149/* FPU was used by this task this quantum (SMP) */
 150#define TS_USEDFPU              0x0001
 151
 152#endif /* __KERNEL__ */
 153#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
 154