[mirror_ubuntu-artful-kernel.git] / include / asm-mn10300 / 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>

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#endif

#define PREEMPT_ACTIVE		0x10000000

#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE		(4096)
#else
#define THREAD_SIZE		(8192)
#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__

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	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
						*/
	struct restart_block    restart_block;

	__u8			supervisor_stack[0];
};

#else /* !__ASSEMBLY__ */

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

#endif

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#ifndef __ASSEMBLY__

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= 1,			\
	.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)
#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;
}

/* 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;
}

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
#else
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif

#define free_thread_info(ti)	kfree((ti))
#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	/* OOM killer killed process */
#define TIF_FREEZE		18	/* freezing for suspend */

#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_RESTORE_SIGMASK	+(1 << TIF_RESTORE_SIGMASK)
#define _TIF_POLLING_NRFLAG	+(1 << TIF_POLLING_NRFLAG)
#define _TIF_FREEZE		+(1 << TIF_FREEZE)

#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 */
Commit	Line	Data
b920de1b DH	1	/* MN10300 Low-level thread information
	2	*
	3	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#ifndef _ASM_THREAD_INFO_H
	13	#define _ASM_THREAD_INFO_H
	14
	15	#ifdef __KERNEL__
	16
	17	#include <asm/page.h>
	18
	19	#ifndef __ASSEMBLY__
	20	#include <asm/processor.h>
	21	#endif
	22
	23	#define PREEMPT_ACTIVE 0x10000000
	24
	25	#ifdef CONFIG_4KSTACKS
	26	#define THREAD_SIZE (4096)
	27	#else
	28	#define THREAD_SIZE (8192)
	29	#endif
	30
	31	#define STACK_WARN (THREAD_SIZE / 8)
	32
	33	/*
	34	* low level task data that entry.S needs immediate access to
	35	* - this struct should fit entirely inside of one cache line
	36	* - this struct shares the supervisor stack pages
	37	* - if the contents of this structure are changed, the assembly constants
	38	* must also be changed
	39	*/
	40	#ifndef __ASSEMBLY__
	41
	42	struct thread_info {
	43	struct task_struct task; / main task structure */
	44	struct exec_domain exec_domain; / execution domain */
	45	unsigned long flags; /* low level flags */
	46	__u32 cpu; /* current CPU */
	47	__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
	48
	49	mm_segment_t addr_limit; /* thread address space:
	50	0-0xBFFFFFFF for user-thead
	51	0-0xFFFFFFFF for kernel-thread
	52	*/
	53	struct restart_block restart_block;
	54
	55	__u8 supervisor_stack[0];
	56	};
	57
	58	#else /* !__ASSEMBLY__ */
	59
	60	#ifndef __ASM_OFFSETS_H__
	61	#include <asm/asm-offsets.h>
	62	#endif
	63
	64	#endif
65
66	/*
67	* macros/functions for gaining access to the thread information structure
68	*
69	* preempt_count needs to be 1 initially, until the scheduler is functional.
70	*/
71	#ifndef __ASSEMBLY__
72
73	#define INIT_THREAD_INFO(tsk) \
74	{ \
75	.task = &tsk, \
76	.exec_domain = &default_exec_domain, \
77	.flags = 0, \
78	.cpu = 0, \
79	.preempt_count = 1, \
80	.addr_limit = KERNEL_DS, \
81	.restart_block = { \
82	.fn = do_no_restart_syscall, \
83	}, \
84	}
85
86	#define init_thread_info (init_thread_union.thread_info)
87	#define init_stack (init_thread_union.stack)
88	#define init_uregs \
89	((struct pt_regs *) \
90	((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))
91
92	extern struct thread_info *__current_ti;
93
94	/* how to get the thread information struct from C */
95	static inline __attribute__((const))
96	struct thread_info *current_thread_info(void)
97	{
98	struct thread_info *ti;
99	asm("mov sp,%0\n"
100	"and %1,%0\n"
101	: "=d" (ti)
102	: "i" (~(THREAD_SIZE - 1))
103	: "cc");
104	return ti;
105	}
106
107	/* how to get the current stack pointer from C */
108	static inline unsigned long current_stack_pointer(void)
109	{
110	unsigned long sp;
111	asm("mov sp,%0; ":"=r" (sp));
112	return sp;
113	}
114
b69c49b7 FT	115	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	116
b920de1b DH	117	/* thread information allocation */
	118	#ifdef CONFIG_DEBUG_STACK_USAGE
	119	#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
	120	#else
	121	#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
	122	#endif
	123
	124	#define free_thread_info(ti) kfree((ti))
	125	#define get_thread_info(ti) get_task_struct((ti)->task)
	126	#define put_thread_info(ti) put_task_struct((ti)->task)
	127
	128	#else /* !__ASSEMBLY__ */
	129
	130	#ifndef __VMLINUX_LDS__
	131	/* how to get the thread information struct from ASM */
	132	.macro GET_THREAD_INFO reg
	133	mov sp,\reg
	134	and -THREAD_SIZE,\reg
	135	.endm
	136	#endif
	137	#endif
	138
	139	/*
	140	* thread information flags
	141	* - these are process state flags that various assembly files may need to
	142	* access
	143	* - pending work-to-be-done flags are in LSW
	144	* - other flags in MSW
	145	*/
	146	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	147	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
	148	#define TIF_SIGPENDING 2 /* signal pending */
	149	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	150	#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
	151	#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
	152	#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	153	#define TIF_MEMDIE 17 /* OOM killer killed process */
	154	#define TIF_FREEZE 18 /* freezing for suspend */
	155
	156	#define _TIF_SYSCALL_TRACE +(1 << TIF_SYSCALL_TRACE)
	157	#define _TIF_NOTIFY_RESUME +(1 << TIF_NOTIFY_RESUME)
	158	#define _TIF_SIGPENDING +(1 << TIF_SIGPENDING)
	159	#define _TIF_NEED_RESCHED +(1 << TIF_NEED_RESCHED)
	160	#define _TIF_SINGLESTEP +(1 << TIF_SINGLESTEP)
	161	#define _TIF_RESTORE_SIGMASK +(1 << TIF_RESTORE_SIGMASK)
	162	#define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG)
	163	#define _TIF_FREEZE +(1 << TIF_FREEZE)
	164
	165	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	166	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
	167
	168	#endif /* __KERNEL__ */
	169
	170	#endif /* _ASM_THREAD_INFO_H */