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 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
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 */
current_thread_info(void)82 static 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 __HAVE_ARCH_THREAD_INFO_ALLOCATOR
96
97 /* thread information allocation */
98 #ifdef CONFIG_DEBUG_STACK_USAGE
99 #define alloc_thread_info_node(tsk, node) \
100 kzalloc_node(THREAD_SIZE, GFP_KERNEL, node)
101 #else
102 #define alloc_thread_info_node(tsk, node) \
103 kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
104 #endif
105
106 #define free_thread_info(info) kfree(info)
107
108 #define TI_FLAG_FAULT_CODE_SHIFT 28
109
set_thread_fault_code(unsigned int val)110 static inline void set_thread_fault_code(unsigned int val)
111 {
112 struct thread_info *ti = current_thread_info();
113 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
114 | (val << TI_FLAG_FAULT_CODE_SHIFT);
115 }
116
get_thread_fault_code(void)117 static inline unsigned int get_thread_fault_code(void)
118 {
119 struct thread_info *ti = current_thread_info();
120 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
121 }
122
123 #endif
124
125 /*
126 * thread information flags
127 * - these are process state flags that various assembly files may need to access
128 * - pending work-to-be-done flags are in LSW
129 * - other flags in MSW
130 */
131 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
132 #define TIF_SIGPENDING 1 /* signal pending */
133 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
134 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
135 #define TIF_IRET 4 /* return with iret */
136 #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
137 #define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
138 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
139 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
140 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
141
142 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
143 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
144 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
145 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
146 #define _TIF_IRET (1<<TIF_IRET)
147 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
148 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
149 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
150 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
151
152 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
153 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
154
155 /*
156 * Thread-synchronous status.
157 *
158 * This is different from the flags in that nobody else
159 * ever touches our thread-synchronous status, so we don't
160 * have to worry about atomic accesses.
161 */
162 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
163
164 #endif /* __KERNEL__ */
165
166 #endif /* _ASM_M32R_THREAD_INFO_H */
167