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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#define THREAD_SIZE (PAGE_SIZE << 1)
59#define THREAD_SIZE_ORDER 1
60/*
61 * macros/functions for gaining access to the thread information structure
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 = INIT_PREEMPT_COUNT, \
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/* how to get the thread information struct from C */
82static inline struct thread_info *current_thread_info(void)
83{
84 struct thread_info *ti;
85
86 __asm__ __volatile__ (
87 "ldi %0, #%1 \n\t"
88 "and %0, sp \n\t"
89 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
90 );
91
92 return ti;
93}
94
95#define TI_FLAG_FAULT_CODE_SHIFT 28
96
97static inline void set_thread_fault_code(unsigned int val)
98{
99 struct thread_info *ti = current_thread_info();
100 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
101 | (val << TI_FLAG_FAULT_CODE_SHIFT);
102}
103
104static inline unsigned int get_thread_fault_code(void)
105{
106 struct thread_info *ti = current_thread_info();
107 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
108}
109
110#endif
111
112/*
113 * thread information flags
114 * - these are process state flags that various assembly files may need to access
115 * - pending work-to-be-done flags are in LSW
116 * - other flags in MSW
117 */
118#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
119#define TIF_SIGPENDING 1 /* signal pending */
120#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
121#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
122#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
123#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
124#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
125#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
126
127#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
132#define _TIF_USEDFPU (1<<TIF_USEDFPU)
133
134#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
135#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
136
137/*
138 * Thread-synchronous status.
139 *
140 * This is different from the flags in that nobody else
141 * ever touches our thread-synchronous status, so we don't
142 * have to worry about atomic accesses.
143 */
144#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
145
146#endif /* __KERNEL__ */
147
148#endif /* _ASM_M32R_THREAD_INFO_H */