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David Howellsb920de12008-02-08 04:19:31 -08001/* MN10300 Low-level thread information
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#ifndef _ASM_THREAD_INFO_H
13#define _ASM_THREAD_INFO_H
14
15#ifdef __KERNEL__
16
17#include <asm/page.h>
18
David Howellsb920de12008-02-08 04:19:31 -080019#ifdef CONFIG_4KSTACKS
20#define THREAD_SIZE (4096)
Thomas Gleixnerc03a6a72012-05-05 15:05:45 +000021#define THREAD_SIZE_ORDER (0)
David Howellsb920de12008-02-08 04:19:31 -080022#else
23#define THREAD_SIZE (8192)
Thomas Gleixnerc03a6a72012-05-05 15:05:45 +000024#define THREAD_SIZE_ORDER (1)
David Howellsb920de12008-02-08 04:19:31 -080025#endif
26
27#define STACK_WARN (THREAD_SIZE / 8)
28
29/*
30 * low level task data that entry.S needs immediate access to
31 * - this struct should fit entirely inside of one cache line
32 * - this struct shares the supervisor stack pages
33 * - if the contents of this structure are changed, the assembly constants
34 * must also be changed
35 */
36#ifndef __ASSEMBLY__
David Howells7c7fcf72010-10-27 17:29:01 +010037typedef struct {
38 unsigned long seg;
39} mm_segment_t;
David Howellsb920de12008-02-08 04:19:31 -080040
41struct thread_info {
42 struct task_struct *task; /* main task structure */
43 struct exec_domain *exec_domain; /* execution domain */
David Howells7c7fcf72010-10-27 17:29:01 +010044 struct pt_regs *frame; /* current exception frame */
David Howellsb920de12008-02-08 04:19:31 -080045 unsigned long flags; /* low level flags */
46 __u32 cpu; /* current CPU */
47 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */
48
49 mm_segment_t addr_limit; /* thread address space:
50 0-0xBFFFFFFF for user-thead
51 0-0xFFFFFFFF for kernel-thread
52 */
David Howellsb920de12008-02-08 04:19:31 -080053
54 __u8 supervisor_stack[0];
55};
56
David Howells7c7fcf72010-10-27 17:29:01 +010057#define thread_info_to_uregs(ti) \
58 ((struct pt_regs *) \
59 ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))
60
David Howellsb920de12008-02-08 04:19:31 -080061#else /* !__ASSEMBLY__ */
62
63#ifndef __ASM_OFFSETS_H__
64#include <asm/asm-offsets.h>
65#endif
66
67#endif
68
69/*
70 * macros/functions for gaining access to the thread information structure
David Howellsb920de12008-02-08 04:19:31 -080071 */
72#ifndef __ASSEMBLY__
73
74#define INIT_THREAD_INFO(tsk) \
75{ \
76 .task = &tsk, \
77 .exec_domain = &default_exec_domain, \
78 .flags = 0, \
79 .cpu = 0, \
Peter Zijlstrac99e6ef2009-07-10 14:57:56 +020080 .preempt_count = INIT_PREEMPT_COUNT, \
David Howellsb920de12008-02-08 04:19:31 -080081 .addr_limit = KERNEL_DS, \
David Howellsb920de12008-02-08 04:19:31 -080082}
83
84#define init_thread_info (init_thread_union.thread_info)
85#define init_stack (init_thread_union.stack)
86#define init_uregs \
87 ((struct pt_regs *) \
88 ((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))
89
90extern struct thread_info *__current_ti;
91
92/* how to get the thread information struct from C */
93static inline __attribute__((const))
94struct thread_info *current_thread_info(void)
95{
96 struct thread_info *ti;
97 asm("mov sp,%0\n"
98 "and %1,%0\n"
99 : "=d" (ti)
100 : "i" (~(THREAD_SIZE - 1))
101 : "cc");
102 return ti;
103}
104
David Howells7c7fcf72010-10-27 17:29:01 +0100105static inline __attribute__((const))
106struct pt_regs *current_frame(void)
107{
108 return current_thread_info()->frame;
109}
110
David Howellsb920de12008-02-08 04:19:31 -0800111/* how to get the current stack pointer from C */
112static inline unsigned long current_stack_pointer(void)
113{
114 unsigned long sp;
115 asm("mov sp,%0; ":"=r" (sp));
116 return sp;
117}
118
David Howells5141c462011-03-18 16:54:32 +0000119#ifndef CONFIG_KGDB
David Howells43224b732012-07-11 16:11:20 +0100120void arch_release_thread_info(struct thread_info *ti);
David Howells5141c462011-03-18 16:54:32 +0000121#endif
David Howellsb920de12008-02-08 04:19:31 -0800122#define get_thread_info(ti) get_task_struct((ti)->task)
123#define put_thread_info(ti) put_task_struct((ti)->task)
124
125#else /* !__ASSEMBLY__ */
126
127#ifndef __VMLINUX_LDS__
128/* how to get the thread information struct from ASM */
129.macro GET_THREAD_INFO reg
130 mov sp,\reg
131 and -THREAD_SIZE,\reg
132.endm
133#endif
134#endif
135
136/*
137 * thread information flags
138 * - these are process state flags that various assembly files may need to
139 * access
140 * - pending work-to-be-done flags are in LSW
141 * - other flags in MSW
142 */
143#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
144#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
145#define TIF_SIGPENDING 2 /* signal pending */
146#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
147#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
148#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
149#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
Andreas Dilger0ddc9322010-05-14 11:13:27 +0200150#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
David Howellsb920de12008-02-08 04:19:31 -0800151
152#define _TIF_SYSCALL_TRACE +(1 << TIF_SYSCALL_TRACE)
153#define _TIF_NOTIFY_RESUME +(1 << TIF_NOTIFY_RESUME)
154#define _TIF_SIGPENDING +(1 << TIF_SIGPENDING)
155#define _TIF_NEED_RESCHED +(1 << TIF_NEED_RESCHED)
156#define _TIF_SINGLESTEP +(1 << TIF_SINGLESTEP)
David Howellsb920de12008-02-08 04:19:31 -0800157#define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG)
David Howellsb920de12008-02-08 04:19:31 -0800158
159#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
160#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
161
David Howellsb920de12008-02-08 04:19:31 -0800162#endif /* __KERNEL__ */
163
164#endif /* _ASM_THREAD_INFO_H */