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
25 struct thread_info {
26 struct task_struct *task; /* main task structure */
27 unsigned long flags; /* low level flags */
28 unsigned long status; /* thread-synchronous flags */
29 __u32 cpu; /* current CPU */
30 int preempt_count; /* 0 => preemptable, <0 => BUG */
31
32 mm_segment_t addr_limit; /* thread address space:
33 0-0xBFFFFFFF for user-thread
34 0-0xFFFFFFFF for kernel-thread
35 */
36
37 __u8 supervisor_stack[0];
38 };
39
40 #endif /* !__ASSEMBLY__ */
41
42 #define THREAD_SIZE (PAGE_SIZE << 1)
43 #define THREAD_SIZE_ORDER 1
44 /*
45 * macros/functions for gaining access to the thread information structure
46 */
47 #ifndef __ASSEMBLY__
48
49 #define INIT_THREAD_INFO(tsk) \
50 { \
51 .task = &tsk, \
52 .flags = 0, \
53 .cpu = 0, \
54 .preempt_count = INIT_PREEMPT_COUNT, \
55 .addr_limit = KERNEL_DS, \
56 }
57
58 #define init_thread_info (init_thread_union.thread_info)
59 #define init_stack (init_thread_union.stack)
60
61 /* how to get the thread information struct from C */
current_thread_info(void)62 static inline struct thread_info *current_thread_info(void)
63 {
64 struct thread_info *ti;
65
66 __asm__ __volatile__ (
67 "ldi %0, #%1 \n\t"
68 "and %0, sp \n\t"
69 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
70 );
71
72 return ti;
73 }
74
75 #define TI_FLAG_FAULT_CODE_SHIFT 28
76
set_thread_fault_code(unsigned int val)77 static inline void set_thread_fault_code(unsigned int val)
78 {
79 struct thread_info *ti = current_thread_info();
80 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
81 | (val << TI_FLAG_FAULT_CODE_SHIFT);
82 }
83
get_thread_fault_code(void)84 static inline unsigned int get_thread_fault_code(void)
85 {
86 struct thread_info *ti = current_thread_info();
87 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
88 }
89
90 #endif
91
92 /*
93 * thread information flags
94 * - these are process state flags that various assembly files may need to access
95 * - pending work-to-be-done flags are in LSW
96 * - other flags in MSW
97 */
98 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
99 #define TIF_SIGPENDING 1 /* signal pending */
100 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
101 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
102 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
103 #define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
104 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
105 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
106
107 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
108 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
109 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
110 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
111 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
112 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
113
114 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
115 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
116
117 /*
118 * Thread-synchronous status.
119 *
120 * This is different from the flags in that nobody else
121 * ever touches our thread-synchronous status, so we don't
122 * have to worry about atomic accesses.
123 */
124 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
125
126 #endif /* __KERNEL__ */
127
128 #endif /* _ASM_M32R_THREAD_INFO_H */
129