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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
59 /* Allocate storage for extra user states and coprocessor states. */
60#if XTENSA_HAVE_COPROCESSORS
61 xtregs_coprocessor_t xtregs_cp;
62#endif
63 xtregs_user_t xtregs_user;
64};
65
66#endif
67
68/*
69 * macros/functions for gaining access to the thread information structure
70 */
71
72#ifndef __ASSEMBLY__
73
74#define INIT_THREAD_INFO(tsk) \
75{ \
76 .task = &tsk, \
77 .flags = 0, \
78 .cpu = 0, \
79 .preempt_count = INIT_PREEMPT_COUNT, \
80 .addr_limit = KERNEL_DS, \
81}
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, "__stringify(CURRENT_SHIFT)"\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, CURRENT_SHIFT; \
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 */
105#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
106#define TIF_SIGPENDING 1 /* signal pending */
107#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
108#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
109#define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */
110#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
111#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
112#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
113#define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
120
121#define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
122 _TIF_SYSCALL_TRACEPOINT)
123
124#define THREAD_SIZE KERNEL_STACK_SIZE
125#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
126
127#endif /* _XTENSA_THREAD_INFO */