thread_info.h

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/*
 * linux/arch/unicore32/include/asm/thread_info.h
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __UNICORE_THREAD_INFO_H__
#define __UNICORE_THREAD_INFO_H__

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <asm/fpstate.h>

#define THREAD_SIZE_ORDER   1
#define THREAD_SIZE     8192
#define THREAD_START_SP     (THREAD_SIZE - 8)

#ifndef __ASSEMBLY__

struct task_struct;
struct exec_domain;

#include <asm/types.h>

typedef struct {
    unsigned long seg;
} mm_segment_t;

struct cpu_context_save {
    __u32   r4;
    __u32   r5;
    __u32   r6;
    __u32   r7;
    __u32   r8;
    __u32   r9;
    __u32   r10;
    __u32   r11;
    __u32   r12;
    __u32   r13;
    __u32   r14;
    __u32   r15;
    __u32   r16;
    __u32   r17;
    __u32   r18;
    __u32   r19;
    __u32   r20;
    __u32   r21;
    __u32   r22;
    __u32   r23;
    __u32   r24;
    __u32   r25;
    __u32   r26;
    __u32   fp;
    __u32   sp;
    __u32   pc;
};

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */
struct thread_info {
    unsigned long       flags;      /* low level flags */
    int         preempt_count;  /* 0 => preemptable */
                        /* <0 => bug */
    mm_segment_t        addr_limit; /* address limit */
    struct task_struct  *task;      /* main task structure */
    struct exec_domain  *exec_domain;   /* execution domain */
    __u32           cpu;        /* cpu */
    struct cpu_context_save cpu_context;    /* cpu context */
    __u32           syscall;    /* syscall number */
    __u8            used_cp[16];    /* thread used copro */
#ifdef CONFIG_UNICORE_FPU_F64
    struct fp_state     fpstate __attribute__((aligned(8)));
#endif
    struct restart_block    restart_block;
};

#define INIT_THREAD_INFO(tsk)                       \
{                                   \
    .task       = &tsk,                     \
    .exec_domain    = &default_exec_domain,             \
    .flags      = 0,                        \
    .preempt_count  = INIT_PREEMPT_COUNT,               \
    .addr_limit = KERNEL_DS,                    \
    .restart_block  = {                     \
        .fn = do_no_restart_syscall,            \
    },                              \
}

#define init_thread_info    (init_thread_union.thread_info)
#define init_stack      (init_thread_union.stack)

/*
 * how to get the thread information struct from C
 */
static inline struct thread_info *current_thread_info(void) __attribute_const__;

static inline struct thread_info *current_thread_info(void)
{
    register unsigned long sp asm ("sp");
    return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
}

#define thread_saved_pc(tsk)    \
    ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
#define thread_saved_sp(tsk)    \
    ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
#define thread_saved_fp(tsk)    \
    ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))

#endif

/*
 * We use bit 30 of the preempt_count to indicate that kernel
 * preemption is occurring.  See <asm/hardirq.h>.
 */
#define PREEMPT_ACTIVE  0x40000000

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE   - syscall trace active
 *  TIF_SIGPENDING  - signal pending
 *  TIF_NEED_RESCHED    - rescheduling necessary
 *  TIF_NOTIFY_RESUME   - callback before returning to user
 */
#define TIF_SIGPENDING      0
#define TIF_NEED_RESCHED    1
#define TIF_NOTIFY_RESUME   2   /* callback before returning to user */
#define TIF_SYSCALL_TRACE   8
#define TIF_MEMDIE      18
#define TIF_RESTORE_SIGMASK 20

#define _TIF_SIGPENDING     (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED   (1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME  (1 << TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_TRACE  (1 << TIF_SYSCALL_TRACE)

/*
 * Change these and you break ASM code in entry-common.S
 */
#define _TIF_WORK_MASK \
    (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)

#endif /* __KERNEL__ */
#endif /* __UNICORE_THREAD_INFO_H__ */