[linux-block.git] / include / asm-xtensa / thread_info.h

/*
 * include/asm-xtensa/thread_info.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_THREAD_INFO_H
#define _XTENSA_THREAD_INFO_H

#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 */
	__s32			preempt_count;	/* 0 => preemptable,< 0 => BUG*/

	mm_segment_t		addr_limit;	/* thread address space */
	struct restart_block    restart_block;


};

#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)

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
	 __asm__("extui %0,a1,0,13\n\t"
	         "xor %0, a1, %0" : "=&r" (ti) : );
	return ti;
}

/* thread information allocation */
#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)

#else /* !__ASSEMBLY__ */

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg,sp) \
	extui reg, sp, 0, 13; \
	xor   reg, sp, reg
#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_IRET		5	/* return with iret */
#define TIF_MEMDIE		6
#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */

#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_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) */

#define THREAD_SIZE 8192	//(2*PAGE_SIZE)

#endif	/* __KERNEL__ */
#endif	/* _XTENSA_THREAD_INFO */
Commit	Line	Data
9a8fd558 CZ	1	/*
	2	* include/asm-xtensa/thread_info.h
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
	8	* Copyright (C) 2001 - 2005 Tensilica Inc.
	9	*/
	10
	11	#ifndef _XTENSA_THREAD_INFO_H
	12	#define _XTENSA_THREAD_INFO_H
	13
	14	#ifdef __KERNEL__
	15
	16	#ifndef __ASSEMBLY__
	17	# include <asm/processor.h>
	18	#endif
	19
	20	/*
	21	* low level task data that entry.S needs immediate access to
	22	* - this struct should fit entirely inside of one cache line
	23	* - this struct shares the supervisor stack pages
	24	* - if the contents of this structure are changed, the assembly constants
	25	* must also be changed
	26	*/
	27
	28	#ifndef __ASSEMBLY__
	29
	30	struct thread_info {
	31	struct task_struct task; / main task structure */
	32	struct exec_domain exec_domain; / execution domain */
	33	unsigned long flags; /* low level flags */
	34	unsigned long status; /* thread-synchronous flags */
	35	__u32 cpu; /* current CPU */
	36	__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
	37
	38	mm_segment_t addr_limit; /* thread address space */
	39	struct restart_block restart_block;
	40
	41
	42	};
	43
	44	#else /* !__ASSEMBLY__ */
	45
	46	/* offsets into the thread_info struct for assembly code access */
	47	#define TI_TASK 0x00000000
	48	#define TI_EXEC_DOMAIN 0x00000004
	49	#define TI_FLAGS 0x00000008
	50	#define TI_STATUS 0x0000000C
	51	#define TI_CPU 0x00000010
	52	#define TI_PRE_COUNT 0x00000014
	53	#define TI_ADDR_LIMIT 0x00000018
	54	#define TI_RESTART_BLOCK 0x000001C
	55
	56	#endif
	57
	58	#define PREEMPT_ACTIVE 0x10000000
	59
	60	/*
	61	* macros/functions for gaining access to the thread information structure
	62	*
	63	* preempt_count needs to be 1 initially, until the scheduler is functional.
	64	*/
65
66	#ifndef __ASSEMBLY__
67
68	#define INIT_THREAD_INFO(tsk) \
69	{ \
70	.task = &tsk, \
71	.exec_domain = &default_exec_domain, \
72	.flags = 0, \
73	.cpu = 0, \
74	.preempt_count = 1, \
75	.addr_limit = KERNEL_DS, \
76	.restart_block = { \
77	.fn = do_no_restart_syscall, \
78	}, \
79	}
80
81	#define init_thread_info (init_thread_union.thread_info)
82	#define init_stack (init_thread_union.stack)
83
84	/* how to get the thread information struct from C */
85	static inline struct thread_info *current_thread_info(void)
86	{
87	struct thread_info *ti;
88	__asm__("extui %0,a1,0,13\n\t"
89	"xor %0, a1, %0" : "=&r" (ti) : );
90	return ti;
91	}
92
93	/* thread information allocation */
94	#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
95	#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
9a8fd558 CZ	96
	97	#else /* !__ASSEMBLY__ */
	98
	99	/* how to get the thread information struct from ASM */
	100	#define GET_THREAD_INFO(reg,sp) \
	101	extui reg, sp, 0, 13; \
	102	xor reg, sp, reg
	103	#endif
	104
	105
	106	/*
	107	* thread information flags
	108	* - these are process state flags that various assembly files may need to access
	109	* - pending work-to-be-done flags are in LSW
	110	* - other flags in MSW
	111	*/
	112	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	113	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
	114	#define TIF_SIGPENDING 2 /* signal pending */
	115	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	116	#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
	117	#define TIF_IRET 5 /* return with iret */
	118	#define TIF_MEMDIE 6
	119	#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	120
	121	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	122	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
	123	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	124	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	125	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	126	#define _TIF_IRET (1<<TIF_IRET)
	127	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	128
	129	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	130	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
	131
	132	/*
	133	* Thread-synchronous status.
	134	*
	135	* This is different from the flags in that nobody else
	136	* ever touches our thread-synchronous status, so we don't
	137	* have to worry about atomic accesses.
	138	*/
	139	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
	140
	141	#define THREAD_SIZE 8192 //(2*PAGE_SIZE)
	142
	143	#endif /* __KERNEL__ */
	144	#endif /* _XTENSA_THREAD_INFO */