LXR linux/arch/unicore32/include/asm/thread

   1/*
   2 * linux/arch/unicore32/include/asm/thread_info.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#ifndef __UNICORE_THREAD_INFO_H__
  13#define __UNICORE_THREAD_INFO_H__
  14
  15#ifdef __KERNEL__
  16
  17#include <linux/compiler.h>
  18#include <asm/fpstate.h>
  19
  20#define THREAD_SIZE_ORDER       1
  21#define THREAD_SIZE             8192
  22#define THREAD_START_SP         (THREAD_SIZE - 8)
  23
  24#ifndef __ASSEMBLY__
  25
  26struct task_struct;
  27
  28#include <asm/types.h>
  29
  30typedef struct {
  31        unsigned long seg;
  32} mm_segment_t;
  33
  34struct cpu_context_save {
  35        __u32   r4;
  36        __u32   r5;
  37        __u32   r6;
  38        __u32   r7;
  39        __u32   r8;
  40        __u32   r9;
  41        __u32   r10;
  42        __u32   r11;
  43        __u32   r12;
  44        __u32   r13;
  45        __u32   r14;
  46        __u32   r15;
  47        __u32   r16;
  48        __u32   r17;
  49        __u32   r18;
  50        __u32   r19;
  51        __u32   r20;
  52        __u32   r21;
  53        __u32   r22;
  54        __u32   r23;
  55        __u32   r24;
  56        __u32   r25;
  57        __u32   r26;
  58        __u32   fp;
  59        __u32   sp;
  60        __u32   pc;
  61};
  62
  63/*
  64 * low level task data that entry.S needs immediate access to.
  65 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  66 */
  67struct thread_info {
  68        unsigned long           flags;          /* low level flags */
  69        int                     preempt_count;  /* 0 => preemptable */
  70                                                /* <0 => bug */
  71        mm_segment_t            addr_limit;     /* address limit */
  72        struct task_struct      *task;          /* main task structure */
  73        __u32                   cpu;            /* cpu */
  74        struct cpu_context_save cpu_context;    /* cpu context */
  75        __u32                   syscall;        /* syscall number */
  76        __u8                    used_cp[16];    /* thread used copro */
  77#ifdef CONFIG_UNICORE_FPU_F64
  78        struct fp_state         fpstate __attribute__((aligned(8)));
  79#endif
  80};
  81
  82#define INIT_THREAD_INFO(tsk)                                           \
  83{                                                                       \
  84        .task           = &tsk,                                         \
  85        .flags          = 0,                                            \
  86        .preempt_count  = INIT_PREEMPT_COUNT,                           \
  87        .addr_limit     = KERNEL_DS,                                    \
  88}
  89
  90#define init_thread_info        (init_thread_union.thread_info)
  91#define init_stack              (init_thread_union.stack)
  92
  93/*
  94 * how to get the thread information struct from C
  95 */
  96static inline struct thread_info *current_thread_info(void) __attribute_const__;
  97
  98static inline struct thread_info *current_thread_info(void)
  99{
 100        register unsigned long sp asm ("sp");
 101        return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 102}
 103
 104#define thread_saved_pc(tsk)    \
 105        ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 106#define thread_saved_sp(tsk)    \
 107        ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 108#define thread_saved_fp(tsk)    \
 109        ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 110
 111#endif
 112
 113/*
 114 * thread information flags:
 115 *  TIF_SYSCALL_TRACE   - syscall trace active
 116 *  TIF_SIGPENDING      - signal pending
 117 *  TIF_NEED_RESCHED    - rescheduling necessary
 118 *  TIF_NOTIFY_RESUME   - callback before returning to user
 119 */
 120#define TIF_SIGPENDING          0
 121#define TIF_NEED_RESCHED        1
 122#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 123#define TIF_SYSCALL_TRACE       8
 124#define TIF_MEMDIE              18
 125#define TIF_RESTORE_SIGMASK     20
 126
 127#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 128#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 129#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 130#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 131
 132/*
 133 * Change these and you break ASM code in entry-common.S
 134 */
 135#define _TIF_WORK_MASK \
 136        (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 137
 138#endif /* __KERNEL__ */
 139#endif /* __UNICORE_THREAD_INFO_H__ */
 140