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;
  27struct exec_domain;
  28
  29#include <asm/types.h>
  30
  31typedef struct {
  32        unsigned long seg;
  33} mm_segment_t;
  34
  35struct cpu_context_save {
  36        __u32   r4;
  37        __u32   r5;
  38        __u32   r6;
  39        __u32   r7;
  40        __u32   r8;
  41        __u32   r9;
  42        __u32   r10;
  43        __u32   r11;
  44        __u32   r12;
  45        __u32   r13;
  46        __u32   r14;
  47        __u32   r15;
  48        __u32   r16;
  49        __u32   r17;
  50        __u32   r18;
  51        __u32   r19;
  52        __u32   r20;
  53        __u32   r21;
  54        __u32   r22;
  55        __u32   r23;
  56        __u32   r24;
  57        __u32   r25;
  58        __u32   r26;
  59        __u32   fp;
  60        __u32   sp;
  61        __u32   pc;
  62};
  63
  64/*
  65 * low level task data that entry.S needs immediate access to.
  66 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  67 */
  68struct thread_info {
  69        unsigned long           flags;          /* low level flags */
  70        int                     preempt_count;  /* 0 => preemptable */
  71                                                /* <0 => bug */
  72        mm_segment_t            addr_limit;     /* address limit */
  73        struct task_struct      *task;          /* main task structure */
  74        struct exec_domain      *exec_domain;   /* execution domain */
  75        __u32                   cpu;            /* cpu */
  76        struct cpu_context_save cpu_context;    /* cpu context */
  77        __u32                   syscall;        /* syscall number */
  78        __u8                    used_cp[16];    /* thread used copro */
  79#ifdef CONFIG_UNICORE_FPU_F64
  80        struct fp_state         fpstate __attribute__((aligned(8)));
  81#endif
  82        struct restart_block    restart_block;
  83};
  84
  85#define INIT_THREAD_INFO(tsk)                                           \
  86{                                                                       \
  87        .task           = &tsk,                                         \
  88        .exec_domain    = &default_exec_domain,                         \
  89        .flags          = 0,                                            \
  90        .preempt_count  = INIT_PREEMPT_COUNT,                           \
  91        .addr_limit     = KERNEL_DS,                                    \
  92        .restart_block  = {                                             \
  93                .fn     = do_no_restart_syscall,                        \
  94        },                                                              \
  95}
  96
  97#define init_thread_info        (init_thread_union.thread_info)
  98#define init_stack              (init_thread_union.stack)
  99
 100/*
 101 * how to get the thread information struct from C
 102 */
 103static inline struct thread_info *current_thread_info(void) __attribute_const__;
 104
 105static inline struct thread_info *current_thread_info(void)
 106{
 107        register unsigned long sp asm ("sp");
 108        return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
 109}
 110
 111#define thread_saved_pc(tsk)    \
 112        ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 113#define thread_saved_sp(tsk)    \
 114        ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 115#define thread_saved_fp(tsk)    \
 116        ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 117
 118#endif
 119
 120/*
 121 * We use bit 30 of the preempt_count to indicate that kernel
 122 * preemption is occurring.  See <asm/hardirq.h>.
 123 */
 124#define PREEMPT_ACTIVE  0x40000000
 125
 126/*
 127 * thread information flags:
 128 *  TIF_SYSCALL_TRACE   - syscall trace active
 129 *  TIF_SIGPENDING      - signal pending
 130 *  TIF_NEED_RESCHED    - rescheduling necessary
 131 *  TIF_NOTIFY_RESUME   - callback before returning to user
 132 */
 133#define TIF_SIGPENDING          0
 134#define TIF_NEED_RESCHED        1
 135#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 136#define TIF_SYSCALL_TRACE       8
 137#define TIF_MEMDIE              18
 138#define TIF_RESTORE_SIGMASK     20
 139
 140#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 141#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 142#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 143#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 144
 145/*
 146 * Change these and you break ASM code in entry-common.S
 147 */
 148#define _TIF_WORK_MASK \
 149        (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 150
 151#endif /* __KERNEL__ */
 152#endif /* __UNICORE_THREAD_INFO_H__ */
 153