[net-next-2.6.git] / include / asm-m32r / thread_info.h

#ifndef _ASM_M32R_THREAD_INFO_H
#define _ASM_M32R_THREAD_INFO_H

/* thread_info.h: m32r low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
 */

#ifdef __KERNEL__

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

/*
 * 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 */
	unsigned long		status;		/* thread-synchronous flags */
	__u32			cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptable, <0 => BUG */

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

	__u8			supervisor_stack[0];
};

#else /* !__ASSEMBLY__ */

/* offsets into the thread_info struct for assembly code access */
#define TI_TASK		0x00000000
#define TI_EXEC_DOMAIN	0x00000004
#define TI_FLAGS	0x00000008
#define TI_STATUS	0x0000000C
#define TI_CPU		0x00000010
#define TI_PRE_COUNT	0x00000014
#define TI_ADDR_LIMIT	0x00000018
#define TI_RESTART_BLOCK 0x000001C

#endif

#define PREEMPT_ACTIVE		0x10000000

/*
 * 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 THREAD_SIZE (2*PAGE_SIZE)

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

	__asm__ __volatile__ (
		"ldi	%0, #%1			\n\t"
		"and	%0, sp			\n\t"
		: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
	);

	return ti;
}

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk)					\
	({							\
		struct thread_info *ret;			\
	 							\
	 	ret = kmalloc(THREAD_SIZE, GFP_KERNEL);		\
	 	if (ret)					\
	 		memset(ret, 0, THREAD_SIZE);		\
	 	ret;						\
	 })
#else
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif

#define free_thread_info(info) kfree(info)

#define TI_FLAG_FAULT_CODE_SHIFT	28

static inline void set_thread_fault_code(unsigned int val)
{
	struct thread_info *ti = current_thread_info();
	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
		| (val << TI_FLAG_FAULT_CODE_SHIFT);
}

static inline unsigned int get_thread_fault_code(void)
{
	struct thread_info *ti = current_thread_info();
	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
}

#else /* !__ASSEMBLY__ */

#define THREAD_SIZE	8192

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg)	GET_THREAD_INFO reg
	.macro GET_THREAD_INFO reg
	ldi	\reg, #-THREAD_SIZE
	and	\reg, sp
	.endm

#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_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
#define TIF_IRET		4	/* return with iret */
#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
					/* 31..28 fault code */
#define TIF_MEMDIE		17

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_IRET		(1<<TIF_IRET)
#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 */

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 */
#define TS_USEDFPU		0x0001	/* FPU was used by this task this quantum (SMP) */

#endif /* __KERNEL__ */

#endif /* _ASM_M32R_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_M32R_THREAD_INFO_H
	2	#define _ASM_M32R_THREAD_INFO_H
	3
	4	/* thread_info.h: m32r low-level thread information
	5	*
	6	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	7	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	8	* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
	9	*/
	10
	11	#ifdef __KERNEL__
	12
	13	#ifndef __ASSEMBLY__
	14	#include <asm/processor.h>
	15	#endif
	16
	17	/*
	18	* low level task data that entry.S needs immediate access to
	19	* - this struct should fit entirely inside of one cache line
	20	* - this struct shares the supervisor stack pages
	21	* - if the contents of this structure are changed, the assembly constants must also be changed
	22	*/
	23	#ifndef __ASSEMBLY__
	24
	25	struct thread_info {
	26	struct task_struct task; / main task structure */
	27	struct exec_domain exec_domain; / execution domain */
	28	unsigned long flags; /* low level flags */
	29	unsigned long status; /* thread-synchronous flags */
	30	__u32 cpu; /* current CPU */
dcd497f9	31	int preempt_count; /* 0 => preemptable, <0 => BUG */
1da177e4 LT	32
	33	mm_segment_t addr_limit; /* thread address space:
	34	0-0xBFFFFFFF for user-thread
	35	0-0xFFFFFFFF for kernel-thread
	36	*/
	37	struct restart_block restart_block;
	38
	39	__u8 supervisor_stack[0];
	40	};
	41
	42	#else /* !__ASSEMBLY__ */
	43
	44	/* offsets into the thread_info struct for assembly code access */
	45	#define TI_TASK 0x00000000
	46	#define TI_EXEC_DOMAIN 0x00000004
	47	#define TI_FLAGS 0x00000008
	48	#define TI_STATUS 0x0000000C
	49	#define TI_CPU 0x00000010
	50	#define TI_PRE_COUNT 0x00000014
	51	#define TI_ADDR_LIMIT 0x00000018
	52	#define TI_RESTART_BLOCK 0x000001C
	53
	54	#endif
	55
	56	#define PREEMPT_ACTIVE 0x10000000
	57
	58	/*
	59	* macros/functions for gaining access to the thread information structure
	60	*
	61	* preempt_count needs to be 1 initially, until the scheduler is functional.
	62	*/
	63	#ifndef __ASSEMBLY__
	64
	65	#define INIT_THREAD_INFO(tsk) \
	66	{ \
	67	.task = &tsk, \
	68	.exec_domain = &default_exec_domain, \
	69	.flags = 0, \
	70	.cpu = 0, \
	71	.preempt_count = 1, \
	72	.addr_limit = KERNEL_DS, \
	73	.restart_block = { \
	74	.fn = do_no_restart_syscall, \
	75	}, \
	76	}
	77
	78	#define init_thread_info (init_thread_union.thread_info)
	79	#define init_stack (init_thread_union.stack)
	80
	81	#define THREAD_SIZE (2*PAGE_SIZE)
	82
	83	/* how to get the thread information struct from C */
	84	static inline struct thread_info *current_thread_info(void)
	85	{
	86	struct thread_info *ti;
	87
	88	__asm__ __volatile__ (
	89	"ldi %0, #%1 \n\t"
	90	"and %0, sp \n\t"
	91	: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
	92	);
	93
	94	return ti;
	95	}
96
97	/* thread information allocation */
c978b017	98	#ifdef CONFIG_DEBUG_STACK_USAGE
1da177e4 LT	99	#define alloc_thread_info(tsk) \
	100	({ \
	101	struct thread_info *ret; \
	102	\
	103	ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
	104	if (ret) \
	105	memset(ret, 0, THREAD_SIZE); \
	106	ret; \
	107	})
	108	#else
	109	#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
	110	#endif
	111
	112	#define free_thread_info(info) kfree(info)
1da177e4 LT	113
	114	#define TI_FLAG_FAULT_CODE_SHIFT 28
	115
	116	static inline void set_thread_fault_code(unsigned int val)
	117	{
	118	struct thread_info *ti = current_thread_info();
	119	ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
	120	\| (val << TI_FLAG_FAULT_CODE_SHIFT);
	121	}
	122
	123	static inline unsigned int get_thread_fault_code(void)
	124	{
	125	struct thread_info *ti = current_thread_info();
	126	return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
	127	}
	128
	129	#else /* !__ASSEMBLY__ */
	130
	131	#define THREAD_SIZE 8192
	132
	133	/* how to get the thread information struct from ASM */
	134	#define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
	135	.macro GET_THREAD_INFO reg
	136	ldi \reg, #-THREAD_SIZE
	137	and \reg, sp
	138	.endm
	139
	140	#endif
	141
	142	/*
	143	* thread information flags
	144	* - these are process state flags that various assembly files may need to access
	145	* - pending work-to-be-done flags are in LSW
	146	* - other flags in MSW
	147	*/
	148	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	149	#define TIF_SIGPENDING 1 /* signal pending */
	150	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	151	#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
	152	#define TIF_IRET 4 /* return with iret */
1da177e4 LT	153	#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	154	/* 31..28 fault code */
	155	#define TIF_MEMDIE 17
	156
	157	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	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_IRET (1<<TIF_IRET)
	162	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	163
	164	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	165	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
	166
	167	/*
	168	* Thread-synchronous status.
	169	*
	170	* This is different from the flags in that nobody else
	171	* ever touches our thread-synchronous status, so we don't
	172	* have to worry about atomic accesses.
	173	*/
	174	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
	175
	176	#endif /* __KERNEL__ */
	177
	178	#endif /* _ASM_M32R_THREAD_INFO_H */