Release 4.14 arch/mn10300/include/asm/thread_info.h

/* MN10300 Low-level thread information
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#ifndef _ASM_THREAD_INFO_H

#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#include <asm/page.h>

#ifdef CONFIG_4KSTACKS

#define THREAD_SIZE		(4096)

#define THREAD_SIZE_ORDER	(0)
#else

#define THREAD_SIZE		(8192)

#define THREAD_SIZE_ORDER	(1)
#endif


#define STACK_WARN		(THREAD_SIZE / 8)

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants
 *   must also be changed
 */
#ifndef __ASSEMBLY__
typedef struct {
	
unsigned long	seg;

} mm_segment_t;


struct thread_info {
	
struct task_struct	*task;		/* main task structure */
	
struct pt_regs		*frame;		/* current exception frame */
	
unsigned long		flags;		/* low level flags */
	
__u32			cpu;		/* current CPU */
	
__s32			preempt_count;	/* 0 => preemptable, <0 => BUG */

	
mm_segment_t		addr_limit;	/* thread address space:
                                                   0-0xBFFFFFFF for user-thead
                                                   0-0xFFFFFFFF for kernel-thread
                                                */

	
__u8			supervisor_stack[0];
};


#define thread_info_to_uregs(ti)					\
	((struct pt_regs *)                                             \
         ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))

#else /* !__ASSEMBLY__ */

#ifndef __ASM_OFFSETS_H__
#include <asm/asm-offsets.h>
#endif

#endif

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__


#define INIT_THREAD_INFO(tsk)			\
{                                               \
        .task           = &tsk,                 \
        .flags          = 0,                    \
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
        .addr_limit     = KERNEL_DS,            \
}


#define init_thread_info	(init_thread_union.thread_info)

#define init_stack		(init_thread_union.stack)

#define init_uregs							\
	((struct pt_regs *)                                             \
         ((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))

extern struct thread_info *__current_ti;

/* how to get the thread information struct from C */
static inline __attribute__((const))

struct thread_info *current_thread_info(void)
{
        struct thread_info *ti;
	asm("mov sp,%0\n"
	    "and %1,%0\n"
	    : "=d" (ti)
	    : "i" (~(THREAD_SIZE - 1))
	    : "cc");
	return ti;
}

static inline __attribute__((const))

struct pt_regs *current_frame(void)
{
	return current_thread_info()->frame;
}

/* how to get the current stack pointer from C */


static inline unsigned long current_stack_pointer(void)
{
	unsigned long sp;
	asm("mov sp,%0; ":"=r" (sp));
	return sp;
}

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#ifndef CONFIG_KGDB
void arch_release_thread_stack(unsigned long *stack);
#endif

#define get_thread_info(ti)	get_task_struct((ti)->task)

#define put_thread_info(ti)	put_task_struct((ti)->task)

#else /* !__ASSEMBLY__ */

#ifndef __VMLINUX_LDS__
/* how to get the thread information struct from ASM */
.macro GET_THREAD_INFO reg
	mov	sp,\reg
	and	-THREAD_SIZE,\reg
.endm
#endif
#endif

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to
 *   access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */

#define TIF_SYSCALL_TRACE	0	
/* syscall trace active */

#define TIF_NOTIFY_RESUME	1	
/* resumption notification requested */

#define TIF_SIGPENDING		2	
/* signal pending */

#define TIF_NEED_RESCHED	3	
/* rescheduling necessary */

#define TIF_SINGLESTEP		4	
/* restore singlestep on return to user mode */

#define TIF_RESTORE_SIGMASK	5	
/* restore signal mask in do_signal() */

#define TIF_POLLING_NRFLAG	16	
/* true if poll_idle() is polling TIF_NEED_RESCHED */

#define TIF_MEMDIE		17	
/* is terminating due to OOM killer */


#define _TIF_SYSCALL_TRACE	+(1 << TIF_SYSCALL_TRACE)

#define _TIF_NOTIFY_RESUME	+(1 << TIF_NOTIFY_RESUME)

#define _TIF_SIGPENDING		+(1 << TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	+(1 << TIF_NEED_RESCHED)

#define _TIF_SINGLESTEP		+(1 << TIF_SINGLESTEP)

#define _TIF_POLLING_NRFLAG	+(1 << TIF_POLLING_NRFLAG)


#define _TIF_WORK_MASK		0x0000FFFE	
/* work to do on interrupt/exception return */

#define _TIF_ALLWORK_MASK	0x0000FFFF	
/* work to do on any return to u-space */

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */
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Directory: arch/mn10300/include/asm

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