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1/*
2 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation, version 2.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
12 * NON INFRINGEMENT. See the GNU General Public License for
13 * more details.
14 */
15
16#ifndef _ASM_TILE_THREAD_INFO_H
17#define _ASM_TILE_THREAD_INFO_H
18
19#include <asm/processor.h>
20#include <asm/page.h>
21#ifndef __ASSEMBLY__
22
23/*
24 * Low level task data that assembly code needs immediate access to.
25 * The structure is placed at the bottom of the supervisor stack.
26 */
27struct thread_info {
28 struct task_struct *task; /* main task structure */
29 struct exec_domain *exec_domain; /* execution domain */
30 unsigned long flags; /* low level flags */
31 unsigned long status; /* thread-synchronous flags */
32 __u32 homecache_cpu; /* CPU we are homecached on */
33 __u32 cpu; /* current CPU */
34 int preempt_count; /* 0 => preemptable,
35 <0 => BUG */
36
37 mm_segment_t addr_limit; /* thread address space
38 (KERNEL_DS or USER_DS) */
39 struct restart_block restart_block;
40 struct single_step_state *step_state; /* single step state
41 (if non-zero) */
42};
43
44/*
45 * macros/functions for gaining access to the thread information structure.
46 */
47#define INIT_THREAD_INFO(tsk) \
48{ \
49 .task = &tsk, \
50 .exec_domain = &default_exec_domain, \
51 .flags = 0, \
52 .cpu = 0, \
53 .preempt_count = INIT_PREEMPT_COUNT, \
54 .addr_limit = KERNEL_DS, \
55 .restart_block = { \
56 .fn = do_no_restart_syscall, \
57 }, \
58 .step_state = NULL, \
59}
60
61#define init_thread_info (init_thread_union.thread_info)
62#define init_stack (init_thread_union.stack)
63
64#endif /* !__ASSEMBLY__ */
65
66#if PAGE_SIZE < 8192
67#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
68#else
69#define THREAD_SIZE_ORDER (0)
70#endif
71#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER)
72
73#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
74#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
75
76#define STACK_WARN (THREAD_SIZE/8)
77
78#ifndef __ASSEMBLY__
79
80void arch_release_thread_info(struct thread_info *info);
81
82/* How to get the thread information struct from C. */
83register unsigned long stack_pointer __asm__("sp");
84
85#define current_thread_info() \
86 ((struct thread_info *)(stack_pointer & -THREAD_SIZE))
87
88/* Sit on a nap instruction until interrupted. */
89extern void smp_nap(void);
90
91/* Enable interrupts racelessly and nap forever: helper for cpu_idle(). */
92extern void _cpu_idle(void);
93
94#else /* __ASSEMBLY__ */
95
96/*
97 * How to get the thread information struct from assembly.
98 * Note that we use different macros since different architectures
99 * have different semantics in their "mm" instruction and we would
100 * like to guarantee that the macro expands to exactly one instruction.
101 */
102#ifdef __tilegx__
103#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63
104#else
105#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
106#endif
107
108#endif /* !__ASSEMBLY__ */
109
110#define PREEMPT_ACTIVE 0x10000000
111
112/*
113 * Thread information flags that various assembly files may need to access.
114 * Keep flags accessed frequently in low bits, particular since it makes
115 * it easier to build constants in assembly.
116 */
117#define TIF_SIGPENDING 0 /* signal pending */
118#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
119#define TIF_SINGLESTEP 2 /* restore singlestep on return to
120 user mode */
121#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */
122#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
123#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
124#define TIF_SECCOMP 6 /* secure computing */
125#define TIF_MEMDIE 7 /* OOM killer at work */
126#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
127
128#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
129#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
130#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
131#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB)
132#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
133#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
134#define _TIF_SECCOMP (1<<TIF_SECCOMP)
135#define _TIF_MEMDIE (1<<TIF_MEMDIE)
136#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
137
138/* Work to do on any return to user space. */
139#define _TIF_ALLWORK_MASK \
140 (_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|\
141 _TIF_ASYNC_TLB|_TIF_NOTIFY_RESUME)
142
143/*
144 * Thread-synchronous status.
145 *
146 * This is different from the flags in that nobody else
147 * ever touches our thread-synchronous status, so we don't
148 * have to worry about atomic accesses.
149 */
150#ifdef __tilegx__
151#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */
152#endif
153#define TS_POLLING 0x0004 /* in idle loop but not sleeping */
154#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */
155
156#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
157
158#ifndef __ASSEMBLY__
159#define HAVE_SET_RESTORE_SIGMASK 1
160static inline void set_restore_sigmask(void)
161{
162 struct thread_info *ti = current_thread_info();
163 ti->status |= TS_RESTORE_SIGMASK;
164 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
165}
166static inline void clear_restore_sigmask(void)
167{
168 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
169}
170static inline bool test_restore_sigmask(void)
171{
172 return current_thread_info()->status & TS_RESTORE_SIGMASK;
173}
174static inline bool test_and_clear_restore_sigmask(void)
175{
176 struct thread_info *ti = current_thread_info();
177 if (!(ti->status & TS_RESTORE_SIGMASK))
178 return false;
179 ti->status &= ~TS_RESTORE_SIGMASK;
180 return true;
181}
182#endif /* !__ASSEMBLY__ */
183
184#endif /* _ASM_TILE_THREAD_INFO_H */
1/*
2 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation, version 2.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
12 * NON INFRINGEMENT. See the GNU General Public License for
13 * more details.
14 */
15
16#ifndef _ASM_TILE_THREAD_INFO_H
17#define _ASM_TILE_THREAD_INFO_H
18
19#include <asm/processor.h>
20#include <asm/page.h>
21#ifndef __ASSEMBLY__
22
23/*
24 * Low level task data that assembly code needs immediate access to.
25 * The structure is placed at the bottom of the supervisor stack.
26 */
27struct thread_info {
28 struct task_struct *task; /* main task structure */
29 unsigned long flags; /* low level flags */
30 unsigned long status; /* thread-synchronous flags */
31 __u32 homecache_cpu; /* CPU we are homecached on */
32 __u32 cpu; /* current CPU */
33 int preempt_count; /* 0 => preemptable,
34 <0 => BUG */
35
36 mm_segment_t addr_limit; /* thread address space
37 (KERNEL_DS or USER_DS) */
38 struct single_step_state *step_state; /* single step state
39 (if non-zero) */
40 int align_ctl; /* controls unaligned access */
41#ifdef __tilegx__
42 unsigned long unalign_jit_tmp[4]; /* temp r0..r3 storage */
43 void __user *unalign_jit_base; /* unalign fixup JIT base */
44#endif
45 bool in_backtrace; /* currently doing backtrace? */
46};
47
48/*
49 * macros/functions for gaining access to the thread information structure.
50 */
51#define INIT_THREAD_INFO(tsk) \
52{ \
53 .task = &tsk, \
54 .flags = 0, \
55 .cpu = 0, \
56 .preempt_count = INIT_PREEMPT_COUNT, \
57 .addr_limit = KERNEL_DS, \
58 .step_state = NULL, \
59 .align_ctl = 0, \
60}
61
62#define init_thread_info (init_thread_union.thread_info)
63#define init_stack (init_thread_union.stack)
64
65#endif /* !__ASSEMBLY__ */
66
67#if PAGE_SIZE < 8192
68#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
69#else
70#define THREAD_SIZE_ORDER (0)
71#endif
72#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER)
73
74#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
75#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
76
77#define STACK_WARN (THREAD_SIZE/8)
78
79#ifndef __ASSEMBLY__
80
81void arch_release_thread_info(struct thread_info *info);
82
83/* How to get the thread information struct from C. */
84register unsigned long stack_pointer __asm__("sp");
85
86#define current_thread_info() \
87 ((struct thread_info *)(stack_pointer & -THREAD_SIZE))
88
89/* Sit on a nap instruction until interrupted. */
90extern void smp_nap(void);
91
92/* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */
93extern void _cpu_idle(void);
94
95#else /* __ASSEMBLY__ */
96
97/*
98 * How to get the thread information struct from assembly.
99 * Note that we use different macros since different architectures
100 * have different semantics in their "mm" instruction and we would
101 * like to guarantee that the macro expands to exactly one instruction.
102 */
103#ifdef __tilegx__
104#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63
105#else
106#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
107#endif
108
109#endif /* !__ASSEMBLY__ */
110
111/*
112 * Thread information flags that various assembly files may need to access.
113 * Keep flags accessed frequently in low bits, particular since it makes
114 * it easier to build constants in assembly.
115 */
116#define TIF_SIGPENDING 0 /* signal pending */
117#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
118#define TIF_SINGLESTEP 2 /* restore singlestep on return to
119 user mode */
120#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */
121#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
122#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
123#define TIF_SECCOMP 6 /* secure computing */
124#define TIF_MEMDIE 7 /* OOM killer at work */
125#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
126#define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
127#define TIF_POLLING_NRFLAG 10 /* idle is polling for TIF_NEED_RESCHED */
128#define TIF_NOHZ 11 /* in adaptive nohz mode */
129
130#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
131#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
132#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
133#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB)
134#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
135#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
136#define _TIF_SECCOMP (1<<TIF_SECCOMP)
137#define _TIF_MEMDIE (1<<TIF_MEMDIE)
138#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
139#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
140#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
141#define _TIF_NOHZ (1<<TIF_NOHZ)
142
143/* Work to do as we loop to exit to user space. */
144#define _TIF_WORK_MASK \
145 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
146 _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME)
147
148/* Work to do on any return to user space. */
149#define _TIF_ALLWORK_MASK \
150 (_TIF_WORK_MASK | _TIF_SINGLESTEP | _TIF_NOHZ)
151
152/* Work to do at syscall entry. */
153#define _TIF_SYSCALL_ENTRY_WORK \
154 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ)
155
156/* Work to do at syscall exit. */
157#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)
158
159/*
160 * Thread-synchronous status.
161 *
162 * This is different from the flags in that nobody else
163 * ever touches our thread-synchronous status, so we don't
164 * have to worry about atomic accesses.
165 */
166#ifdef __tilegx__
167#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */
168#endif
169#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */
170
171#ifndef __ASSEMBLY__
172#define HAVE_SET_RESTORE_SIGMASK 1
173static inline void set_restore_sigmask(void)
174{
175 struct thread_info *ti = current_thread_info();
176 ti->status |= TS_RESTORE_SIGMASK;
177 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
178}
179static inline void clear_restore_sigmask(void)
180{
181 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
182}
183static inline bool test_restore_sigmask(void)
184{
185 return current_thread_info()->status & TS_RESTORE_SIGMASK;
186}
187static inline bool test_and_clear_restore_sigmask(void)
188{
189 struct thread_info *ti = current_thread_info();
190 if (!(ti->status & TS_RESTORE_SIGMASK))
191 return false;
192 ti->status &= ~TS_RESTORE_SIGMASK;
193 return true;
194}
195#endif /* !__ASSEMBLY__ */
196
197#endif /* _ASM_TILE_THREAD_INFO_H */