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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 THREAD_SIZE (PAGE_SIZE << 1)
57#define THREAD_SIZE_ORDER 1
58/*
59 * macros/functions for gaining access to the thread information structure
60 */
61#ifndef __ASSEMBLY__
62
63#define INIT_THREAD_INFO(tsk) \
64{ \
65 .task = &tsk, \
66 .exec_domain = &default_exec_domain, \
67 .flags = 0, \
68 .cpu = 0, \
69 .preempt_count = INIT_PREEMPT_COUNT, \
70 .addr_limit = KERNEL_DS, \
71 .restart_block = { \
72 .fn = do_no_restart_syscall, \
73 }, \
74}
75
76#define init_thread_info (init_thread_union.thread_info)
77#define init_stack (init_thread_union.stack)
78
79/* how to get the thread information struct from C */
80static inline struct thread_info *current_thread_info(void)
81{
82 struct thread_info *ti;
83
84 __asm__ __volatile__ (
85 "ldi %0, #%1 \n\t"
86 "and %0, sp \n\t"
87 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
88 );
89
90 return ti;
91}
92
93#define TI_FLAG_FAULT_CODE_SHIFT 28
94
95static inline void set_thread_fault_code(unsigned int val)
96{
97 struct thread_info *ti = current_thread_info();
98 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
99 | (val << TI_FLAG_FAULT_CODE_SHIFT);
100}
101
102static inline unsigned int get_thread_fault_code(void)
103{
104 struct thread_info *ti = current_thread_info();
105 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
106}
107
108#endif
109
110/*
111 * thread information flags
112 * - these are process state flags that various assembly files may need to access
113 * - pending work-to-be-done flags are in LSW
114 * - other flags in MSW
115 */
116#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
117#define TIF_SIGPENDING 1 /* signal pending */
118#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
119#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
120#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
121#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
122#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
123#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
124
125#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
126#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
127#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
128#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
129#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
130#define _TIF_USEDFPU (1<<TIF_USEDFPU)
131
132#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
133#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
134
135/*
136 * Thread-synchronous status.
137 *
138 * This is different from the flags in that nobody else
139 * ever touches our thread-synchronous status, so we don't
140 * have to worry about atomic accesses.
141 */
142#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
143
144#endif /* __KERNEL__ */
145
146#endif /* _ASM_M32R_THREAD_INFO_H */