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#include <linux/stringify.h>
15#include <asm/kmem_layout.h>
16
17#define CURRENT_SHIFT KERNEL_STACK_SHIFT
18
19#ifndef __ASSEMBLY__
20# include <asm/processor.h>
21#endif
22
23/*
24 * low level task data that entry.S needs immediate access to
25 * - this struct should fit entirely inside of one cache line
26 * - this struct shares the supervisor stack pages
27 * - if the contents of this structure are changed, the assembly constants
28 *   must also be changed
29 */
30
31#ifndef __ASSEMBLY__
32
33#if XTENSA_HAVE_COPROCESSORS
34
35typedef struct xtregs_coprocessor {
36	xtregs_cp0_t cp0;
37	xtregs_cp1_t cp1;
38	xtregs_cp2_t cp2;
39	xtregs_cp3_t cp3;
40	xtregs_cp4_t cp4;
41	xtregs_cp5_t cp5;
42	xtregs_cp6_t cp6;
43	xtregs_cp7_t cp7;
44} xtregs_coprocessor_t;
45
46#endif
47
48struct thread_info {
49	struct task_struct	*task;		/* main task structure */
50	unsigned long		flags;		/* low level flags */
51	unsigned long		status;		/* thread-synchronous flags */
52	__u32			cpu;		/* current CPU */
53	__s32			preempt_count;	/* 0 => preemptable,< 0 => BUG*/
54
55	mm_segment_t		addr_limit;	/* thread address space */
56
57	unsigned long		cpenable;
58#if XCHAL_HAVE_EXCLUSIVE
59	/* result of the most recent exclusive store */
60	unsigned long		atomctl8;
61#endif
62
63	/* Allocate storage for extra user states and coprocessor states. */
64#if XTENSA_HAVE_COPROCESSORS
65	xtregs_coprocessor_t	xtregs_cp;
66#endif
67	xtregs_user_t		xtregs_user;
68};
69
70#endif
71
72/*
73 * macros/functions for gaining access to the thread information structure
74 */
75
76#ifndef __ASSEMBLY__
77
78#define INIT_THREAD_INFO(tsk)			\
79{						\
80	.task		= &tsk,			\
81	.flags		= 0,			\
82	.cpu		= 0,			\
83	.preempt_count	= INIT_PREEMPT_COUNT,	\
84	.addr_limit	= KERNEL_DS,		\
85}
86
87/* how to get the thread information struct from C */
88static inline struct thread_info *current_thread_info(void)
89{
90	struct thread_info *ti;
91	 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
92	         "xor %0, a1, %0" : "=&r" (ti) : );
93	return ti;
94}
95
96#else /* !__ASSEMBLY__ */
97
98/* how to get the thread information struct from ASM */
99#define GET_THREAD_INFO(reg,sp) \
100	extui reg, sp, 0, CURRENT_SHIFT; \
101	xor   reg, sp, reg
102#endif
103
104
105/*
106 * thread information flags
107 * - these are process state flags that various assembly files may need to access
108 */
109#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
110#define TIF_SIGPENDING		1	/* signal pending */
111#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
112#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
113#define TIF_SYSCALL_TRACEPOINT	4	/* syscall tracepoint instrumentation */
114#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
115#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
116#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
117#define TIF_DB_DISABLED		8	/* debug trap disabled for syscall */
118#define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
119#define TIF_SECCOMP		10	/* secure computing */
120#define TIF_MEMDIE		11	/* is terminating due to OOM killer */
121
122#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
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_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
127#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
128#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
129#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
130#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
131
132#define _TIF_WORK_MASK		(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
133				 _TIF_SYSCALL_TRACEPOINT | \
134				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
135
136#define THREAD_SIZE KERNEL_STACK_SIZE
137#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
138
139#endif	/* _XTENSA_THREAD_INFO */
140