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1#ifndef _ASM_M32R_THREAD_INFO_H
2#define _ASM_M32R_THREAD_INFO_H
3
4/* thread_info.h: m32r low-level thread information
5 *
6 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
7 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
8 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
9 */
10
11#ifdef __KERNEL__
12
13#ifndef __ASSEMBLY__
14#include <asm/processor.h>
15#endif
16
17/*
18 * low level task data that entry.S needs immediate access to
19 * - this struct should fit entirely inside of one cache line
20 * - this struct shares the supervisor stack pages
21 * - if the contents of this structure are changed, the assembly constants must also be changed
22 */
23#ifndef __ASSEMBLY__
24
25struct thread_info {
26 struct task_struct *task; /* main task structure */
27 struct exec_domain *exec_domain; /* execution domain */
28 unsigned long flags; /* low level flags */
29 unsigned long status; /* thread-synchronous flags */
30 __u32 cpu; /* current CPU */
31 int preempt_count; /* 0 => preemptable, <0 => BUG */
32
33 mm_segment_t addr_limit; /* thread address space:
34 0-0xBFFFFFFF for user-thread
35 0-0xFFFFFFFF for kernel-thread
36 */
37 struct restart_block restart_block;
38
39 __u8 supervisor_stack[0];
40};
41
42#else /* !__ASSEMBLY__ */
43
44/* offsets into the thread_info struct for assembly code access */
45#define TI_TASK 0x00000000
46#define TI_EXEC_DOMAIN 0x00000004
47#define TI_FLAGS 0x00000008
48#define TI_STATUS 0x0000000C
49#define TI_CPU 0x00000010
50#define TI_PRE_COUNT 0x00000014
51#define TI_ADDR_LIMIT 0x00000018
52#define TI_RESTART_BLOCK 0x000001C
53
54#endif
55
56#define PREEMPT_ACTIVE 0x10000000
57
58/*
59 * macros/functions for gaining access to the thread information structure
60 *
61 * preempt_count needs to be 1 initially, until the scheduler is functional.
62 */
63#ifndef __ASSEMBLY__
64
65#define INIT_THREAD_INFO(tsk) \
66{ \
67 .task = &tsk, \
68 .exec_domain = &default_exec_domain, \
69 .flags = 0, \
70 .cpu = 0, \
71 .preempt_count = 1, \
72 .addr_limit = KERNEL_DS, \
73 .restart_block = { \
74 .fn = do_no_restart_syscall, \
75 }, \
76}
77
78#define init_thread_info (init_thread_union.thread_info)
79#define init_stack (init_thread_union.stack)
80
81#define THREAD_SIZE (2*PAGE_SIZE)
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
88 __asm__ __volatile__ (
89 "ldi %0, #%1 \n\t"
90 "and %0, sp \n\t"
91 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
92 );
93
94 return ti;
95}
96
97/* thread information allocation */
98#ifdef CONFIG_DEBUG_STACK_USAGE
99#define alloc_thread_info(tsk) \
100 ({ \
101 struct thread_info *ret; \
102 \
103 ret = kzalloc(THREAD_SIZE, GFP_KERNEL); \
104 \
105 ret; \
106 })
107#else
108#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
109#endif
110
111#define free_thread_info(info) kfree(info)
112
113#define TI_FLAG_FAULT_CODE_SHIFT 28
114
115static inline void set_thread_fault_code(unsigned int val)
116{
117 struct thread_info *ti = current_thread_info();
118 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
119 | (val << TI_FLAG_FAULT_CODE_SHIFT);
120}
121
122static inline unsigned int get_thread_fault_code(void)
123{
124 struct thread_info *ti = current_thread_info();
125 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
126}
127
128#else /* !__ASSEMBLY__ */
129
130#define THREAD_SIZE 8192
131
132/* how to get the thread information struct from ASM */
133#define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
134 .macro GET_THREAD_INFO reg
135 ldi \reg, #-THREAD_SIZE
136 and \reg, sp
137 .endm
138
139#endif
140
141/*
142 * thread information flags
143 * - these are process state flags that various assembly files may need to access
144 * - pending work-to-be-done flags are in LSW
145 * - other flags in MSW
146 */
147#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
148#define TIF_SIGPENDING 1 /* signal pending */
149#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
150#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
151#define TIF_IRET 4 /* return with iret */
152#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
153#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
154#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
155#define TIF_MEMDIE 18 /* OOM killer killed process */
156#define TIF_FREEZE 19 /* is freezing for suspend */
157
158#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
159#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
160#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
161#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
162#define _TIF_IRET (1<<TIF_IRET)
163#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
164#define _TIF_USEDFPU (1<<TIF_USEDFPU)
165#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
166#define _TIF_FREEZE (1<<TIF_FREEZE)
167
168#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
169#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
170
171/*
172 * Thread-synchronous status.
173 *
174 * This is different from the flags in that nobody else
175 * ever touches our thread-synchronous status, so we don't
176 * have to worry about atomic accesses.
177 */
178#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
179
180#endif /* __KERNEL__ */
181
182#endif /* _ASM_M32R_THREAD_INFO_H */