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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 <asm/kmem_layout.h>
15
16#define CURRENT_SHIFT KERNEL_STACK_SHIFT
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
32#if XTENSA_HAVE_COPROCESSORS
33
34typedef 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
47struct thread_info {
48 struct task_struct *task; /* main task structure */
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 */
55
56 unsigned long cpenable;
57
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;
63};
64
65#endif
66
67/*
68 * macros/functions for gaining access to the thread information structure
69 */
70
71#ifndef __ASSEMBLY__
72
73#define INIT_THREAD_INFO(tsk) \
74{ \
75 .task = &tsk, \
76 .flags = 0, \
77 .cpu = 0, \
78 .preempt_count = INIT_PREEMPT_COUNT, \
79 .addr_limit = KERNEL_DS, \
80}
81
82/* how to get the thread information struct from C */
83static inline struct thread_info *current_thread_info(void)
84{
85 struct thread_info *ti;
86 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
87 "xor %0, a1, %0" : "=&r" (ti) : );
88 return ti;
89}
90
91#else /* !__ASSEMBLY__ */
92
93/* how to get the thread information struct from ASM */
94#define GET_THREAD_INFO(reg,sp) \
95 extui reg, sp, 0, CURRENT_SHIFT; \
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 */
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 */
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
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 KERNEL_STACK_SIZE
133#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
134
135#endif /* _XTENSA_THREAD_INFO */