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#if XTENSA_HAVE_COPROCESSORS
31
32typedef 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
45struct thread_info {
46	struct task_struct	*task;		/* main task structure */
47	unsigned long		flags;		/* low level flags */
48	unsigned long		status;		/* thread-synchronous flags */
49	__u32			cpu;		/* current CPU */
50	__s32			preempt_count;	/* 0 => preemptable,< 0 => BUG*/
51
52	mm_segment_t		addr_limit;	/* thread address space */
53
54	unsigned long		cpenable;
55
56	/* Allocate storage for extra user states and coprocessor states. */
57#if XTENSA_HAVE_COPROCESSORS
58	xtregs_coprocessor_t	xtregs_cp;
59#endif
60	xtregs_user_t		xtregs_user;
61};
62
63#endif
64
65/*
66 * macros/functions for gaining access to the thread information structure
67 */
68
69#ifndef __ASSEMBLY__
70
71#define INIT_THREAD_INFO(tsk)			\
72{						\
73	.task		= &tsk,			\
74	.flags		= 0,			\
75	.cpu		= 0,			\
76	.preempt_count	= INIT_PREEMPT_COUNT,	\
77	.addr_limit	= KERNEL_DS,		\
78}
79
80#define init_thread_info	(init_thread_union.thread_info)
81#define init_stack		(init_thread_union.stack)
82
83/* how to get the thread information struct from C */
84static inline struct thread_info *current_thread_info(void)
85{
86	struct thread_info *ti;
87	 __asm__("extui %0,a1,0,13\n\t"
88	         "xor %0, a1, %0" : "=&r" (ti) : );
89	return ti;
90}
91
92#else /* !__ASSEMBLY__ */
93
94/* how to get the thread information struct from ASM */
95#define GET_THREAD_INFO(reg,sp) \
96	extui reg, sp, 0, 13; \
97	xor   reg, sp, reg
98#endif
99
100
101/*
102 * thread information flags
103 * - these are process state flags that various assembly files may need to access
104 * - pending work-to-be-done flags are in LSW
105 * - other flags in MSW
106 */
107#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
108#define TIF_SIGPENDING		1	/* signal pending */
109#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
110#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
111#define TIF_MEMDIE		5	/* is terminating due to OOM killer */
112#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
113#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
114
115#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
116#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
117#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
118#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
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
132#define THREAD_SIZE 8192	//(2*PAGE_SIZE)
133#define THREAD_SIZE_ORDER 1
134
135#endif	/* __KERNEL__ */
136#endif	/* _XTENSA_THREAD_INFO */
137