[mirror_ubuntu-jammy-kernel.git] / arch / xtensa / include / asm / 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

#include <asm/kmem_layout.h>

#define CURRENT_SHIFT KERNEL_STACK_SHIFT

#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 */
	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 */

	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;
};

#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,		\
}

/* 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, "__stringify(CURRENT_SHIFT)"\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, CURRENT_SHIFT; \
	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_MEMDIE		5	/* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
#define TIF_DB_DISABLED		8	/* debug trap disabled for syscall */

#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_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 KERNEL_STACK_SIZE
#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)

#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
f4431396 MF	14	#include <asm/kmem_layout.h>
	15
	16	#define CURRENT_SHIFT KERNEL_STACK_SHIFT
9a8fd558 CZ	17
	18	#ifndef __ASSEMBLY__
	19	# include <asm/processor.h>
	20	#endif
	21
	22	/*
	23	* low level task data that entry.S needs immediate access to
	24	* - this struct should fit entirely inside of one cache line
	25	* - this struct shares the supervisor stack pages
	26	* - if the contents of this structure are changed, the assembly constants
	27	* must also be changed
	28	*/
	29
	30	#ifndef __ASSEMBLY__
	31
c658eac6 CZ	32	#if XTENSA_HAVE_COPROCESSORS
	33
	34	typedef struct xtregs_coprocessor {
	35	xtregs_cp0_t cp0;
	36	xtregs_cp1_t cp1;
	37	xtregs_cp2_t cp2;
	38	xtregs_cp3_t cp3;
	39	xtregs_cp4_t cp4;
	40	xtregs_cp5_t cp5;
	41	xtregs_cp6_t cp6;
	42	xtregs_cp7_t cp7;
	43	} xtregs_coprocessor_t;
	44
	45	#endif
	46
9a8fd558 CZ	47	struct thread_info {
9a8fd558 CZ	48	struct task_struct task; / main task structure */
9a8fd558 CZ	49	unsigned long flags; /* low level flags */
	50	unsigned long status; /* thread-synchronous flags */
	51	__u32 cpu; /* current CPU */
	52	__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
	53
	54	mm_segment_t addr_limit; /* thread address space */
9a8fd558	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	};
9a8fd558 CZ	64
9a8fd558 CZ	65	#endif
9a8fd558 CZ	66
9a8fd558 CZ	67	/*
9a8fd558 CZ	68	* macros/functions for gaining access to the thread information structure
9a8fd558 CZ	69	*/
	70
	71	#ifndef __ASSEMBLY__
	72
	73	#define INIT_THREAD_INFO(tsk) \
	74	{ \
	75	.task = &tsk, \
9a8fd558 CZ	76	.flags = 0, \
9a8fd558 CZ	77	.cpu = 0, \
c99e6efe	78	.preempt_count = INIT_PREEMPT_COUNT, \
9a8fd558	79	.addr_limit = KERNEL_DS, \
9a8fd558 CZ	80	}
9a8fd558 CZ	81
9a8fd558 CZ	82	/* how to get the thread information struct from C */
	83	static inline struct thread_info *current_thread_info(void)
	84	{
	85	struct thread_info *ti;
f4431396	86	__asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
9a8fd558 CZ	87	"xor %0, a1, %0" : "=&r" (ti) : );
	88	return ti;
	89	}
	90
9a8fd558 CZ	91	#else /* !__ASSEMBLY__ */
	92
	93	/* how to get the thread information struct from ASM */
	94	#define GET_THREAD_INFO(reg,sp) \
f4431396	95	extui reg, sp, 0, CURRENT_SHIFT; \
9a8fd558 CZ	96	xor reg, sp, reg
	97	#endif
	98
	99
	100	/*
	101	* thread information flags
	102	* - these are process state flags that various assembly files may need to access
	103	* - pending work-to-be-done flags are in LSW
	104	* - other flags in MSW
	105	*/
	106	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	107	#define TIF_SIGPENDING 1 /* signal pending */
	108	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	109	#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
0ddc9324	110	#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
a583f1b5	111	#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
a53bb24e	112	#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
c91e02bd	113	#define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */
9a8fd558 CZ	114
9a8fd558 CZ	115	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
9a8fd558 CZ	116	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	117	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	118	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
9a8fd558 CZ	119
	120	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	121	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
	122
	123	/*
	124	* Thread-synchronous status.
	125	*
	126	* This is different from the flags in that nobody else
	127	* ever touches our thread-synchronous status, so we don't
	128	* have to worry about atomic accesses.
	129	*/
	130	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
	131
f4431396 MF	132	#define THREAD_SIZE KERNEL_STACK_SIZE
f4431396 MF	133	#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
9a8fd558	134
9a8fd558	135	#endif /* _XTENSA_THREAD_INFO */