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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 __ASSEMBLER__
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 __ASSEMBLER__
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#if XCHAL_HAVE_EXCLUSIVE
56 /* result of the most recent exclusive store */
57 unsigned long atomctl8;
58#endif
59#ifdef CONFIG_USER_ABI_CALL0_PROBE
60 /* Address where PS.WOE was enabled by the ABI probing code */
61 unsigned long ps_woe_fix_addr;
62#endif
63
64 /*
65 * If i-th bit is set then coprocessor state is loaded into the
66 * coprocessor i on CPU cp_owner_cpu.
67 */
68 unsigned long cpenable;
69 u32 cp_owner_cpu;
70 /* Allocate storage for extra user states and coprocessor states. */
71#if XTENSA_HAVE_COPROCESSORS
72 xtregs_coprocessor_t xtregs_cp;
73#endif
74 xtregs_user_t xtregs_user;
75};
76
77#endif
78
79/*
80 * macros/functions for gaining access to the thread information structure
81 */
82
83#ifndef __ASSEMBLER__
84
85#define INIT_THREAD_INFO(tsk) \
86{ \
87 .task = &tsk, \
88 .flags = 0, \
89 .cpu = 0, \
90 .preempt_count = INIT_PREEMPT_COUNT, \
91}
92
93/* how to get the thread information struct from C */
94static __always_inline struct thread_info *current_thread_info(void)
95{
96 struct thread_info *ti;
97 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
98 "xor %0, a1, %0" : "=&r" (ti) : );
99 return ti;
100}
101
102#else /* !__ASSEMBLER__ */
103
104/* how to get the thread information struct from ASM */
105#define GET_THREAD_INFO(reg,sp) \
106 extui reg, sp, 0, CURRENT_SHIFT; \
107 xor reg, sp, reg
108#endif
109
110
111/*
112 * thread information flags
113 * - these are process state flags that various assembly files may need to access
114 */
115#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
116#define TIF_SIGPENDING 1 /* signal pending */
117#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
118#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
119#define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */
120#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
121#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
122#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
123#define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */
124#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
125#define TIF_SECCOMP 10 /* secure computing */
126#define TIF_MEMDIE 11 /* is terminating due to OOM killer */
127
128#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
129#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
130#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
131#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
132#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
133#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
134#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
135#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
136#define _TIF_SECCOMP (1<<TIF_SECCOMP)
137
138#define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
139 _TIF_SYSCALL_TRACEPOINT | \
140 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
141
142#define THREAD_SIZE KERNEL_STACK_SIZE
143#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
144
145#endif /* _XTENSA_THREAD_INFO */