[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__

#if XTENSA_HAVE_COPROCESSORS

typedef struct xtregs_coprocessor {
	xtregs_cp0_t cp0;
	xtregs_cp1_t cp1;
	xtregs_cp2_t cp2;
	xtregs_cp3_t cp3;
	xtregs_cp4_t cp4;
	xtregs_cp5_t cp5;
	xtregs_cp6_t cp6;
	xtregs_cp7_t cp7;
} xtregs_coprocessor_t;

#endif

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;

	unsigned long		cpenable;

	/* Allocate storage for extra user states and coprocessor states. */
#if XTENSA_HAVE_COPROCESSORS
	xtregs_coprocessor_t	xtregs_cp;
#endif
	xtregs_user_t		xtregs_user;
};

#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;
}

#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_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_MEMDIE		5
#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_FREEZE		17	/* is freezing for suspend */

#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_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#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 */

/*
 * 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)
#define THREAD_SIZE_ORDER 1

#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
c658eac6 CZ	30	#if XTENSA_HAVE_COPROCESSORS
	31
	32	typedef struct xtregs_coprocessor {
	33	xtregs_cp0_t cp0;
	34	xtregs_cp1_t cp1;
	35	xtregs_cp2_t cp2;
	36	xtregs_cp3_t cp3;
	37	xtregs_cp4_t cp4;
	38	xtregs_cp5_t cp5;
	39	xtregs_cp6_t cp6;
	40	xtregs_cp7_t cp7;
	41	} xtregs_coprocessor_t;
	42
	43	#endif
	44
9a8fd558 CZ	45	struct thread_info {
	46	struct task_struct task; / main task structure */
	47	struct exec_domain exec_domain; / execution domain */
	48	unsigned long flags; /* low level flags */
	49	unsigned long status; /* thread-synchronous flags */
	50	__u32 cpu; /* current CPU */
	51	__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
	52
	53	mm_segment_t addr_limit; /* thread address space */
	54	struct restart_block restart_block;
	55
c658eac6	56	unsigned long cpenable;
9a8fd558	57
c658eac6 CZ	58	/* Allocate storage for extra user states and coprocessor states. */
	59	#if XTENSA_HAVE_COPROCESSORS
	60	xtregs_coprocessor_t xtregs_cp;
	61	#endif
	62	xtregs_user_t xtregs_user;
9a8fd558 CZ	63	};
	64
	65	#else /* !__ASSEMBLY__ */
	66
	67	/* offsets into the thread_info struct for assembly code access */
	68	#define TI_TASK 0x00000000
	69	#define TI_EXEC_DOMAIN 0x00000004
	70	#define TI_FLAGS 0x00000008
	71	#define TI_STATUS 0x0000000C
	72	#define TI_CPU 0x00000010
	73	#define TI_PRE_COUNT 0x00000014
	74	#define TI_ADDR_LIMIT 0x00000018
	75	#define TI_RESTART_BLOCK 0x000001C
	76
	77	#endif
	78
	79	#define PREEMPT_ACTIVE 0x10000000
	80
	81	/*
	82	* macros/functions for gaining access to the thread information structure
	83	*
	84	* preempt_count needs to be 1 initially, until the scheduler is functional.
	85	*/
	86
	87	#ifndef __ASSEMBLY__
	88
	89	#define INIT_THREAD_INFO(tsk) \
	90	{ \
	91	.task = &tsk, \
	92	.exec_domain = &default_exec_domain, \
	93	.flags = 0, \
	94	.cpu = 0, \
	95	.preempt_count = 1, \
	96	.addr_limit = KERNEL_DS, \
	97	.restart_block = { \
	98	.fn = do_no_restart_syscall, \
	99	}, \
	100	}
	101
	102	#define init_thread_info (init_thread_union.thread_info)
	103	#define init_stack (init_thread_union.stack)
	104
	105	/* how to get the thread information struct from C */
	106	static inline struct thread_info *current_thread_info(void)
	107	{
	108	struct thread_info *ti;
	109	__asm__("extui %0,a1,0,13\n\t"
	110	"xor %0, a1, %0" : "=&r" (ti) : );
	111	return ti;
	112	}
	113
9a8fd558 CZ	114	#else /* !__ASSEMBLY__ */
	115
	116	/* how to get the thread information struct from ASM */
	117	#define GET_THREAD_INFO(reg,sp) \
	118	extui reg, sp, 0, 13; \
	119	xor reg, sp, reg
	120	#endif
	121
	122
	123	/*
	124	* thread information flags
	125	* - these are process state flags that various assembly files may need to access
	126	* - pending work-to-be-done flags are in LSW
	127	* - other flags in MSW
	128	*/
	129	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	130	#define TIF_SIGPENDING 1 /* signal pending */
	131	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	132	#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
	133	#define TIF_IRET 4 /* return with iret */
	134	#define TIF_MEMDIE 5
	135	#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
9a8fd558	136	#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
83224b08	137	#define TIF_FREEZE 17 /* is freezing for suspend */
9a8fd558 CZ	138
9a8fd558 CZ	139	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
9a8fd558 CZ	140	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	141	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	142	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	143	#define _TIF_IRET (1<<TIF_IRET)
	144	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
de4f6e5b	145	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
83224b08	146	#define _TIF_FREEZE (1<<TIF_FREEZE)
9a8fd558 CZ	147
	148	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	149	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
	150
	151	/*
	152	* Thread-synchronous status.
	153	*
	154	* This is different from the flags in that nobody else
	155	* ever touches our thread-synchronous status, so we don't
	156	* have to worry about atomic accesses.
	157	*/
	158	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
	159
	160	#define THREAD_SIZE 8192 //(2*PAGE_SIZE)
b69c49b7	161	#define THREAD_SIZE_ORDER 1
9a8fd558 CZ	162
	163	#endif /* __KERNEL__ */
	164	#endif /* _XTENSA_THREAD_INFO */