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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 */
Jesper Juhldcd497f2005-06-23 00:09:07 -070031 int preempt_count; /* 0 => preemptable, <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
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 */
Hirokazu Takatac978b012005-10-30 15:00:04 -080098#ifdef CONFIG_DEBUG_STACK_USAGE
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#define alloc_thread_info(tsk) \
100 ({ \
101 struct thread_info *ret; \
102 \
103 ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
104 if (ret) \
105 memset(ret, 0, THREAD_SIZE); \
106 ret; \
107 })
108#else
109#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
110#endif
111
112#define free_thread_info(info) kfree(info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114#define TI_FLAG_FAULT_CODE_SHIFT 28
115
116static inline void set_thread_fault_code(unsigned int val)
117{
118 struct thread_info *ti = current_thread_info();
119 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
120 | (val << TI_FLAG_FAULT_CODE_SHIFT);
121}
122
123static inline unsigned int get_thread_fault_code(void)
124{
125 struct thread_info *ti = current_thread_info();
126 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
127}
128
129#else /* !__ASSEMBLY__ */
130
131#define THREAD_SIZE 8192
132
133/* how to get the thread information struct from ASM */
134#define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
135 .macro GET_THREAD_INFO reg
136 ldi \reg, #-THREAD_SIZE
137 and \reg, sp
138 .endm
139
140#endif
141
142/*
143 * thread information flags
144 * - these are process state flags that various assembly files may need to access
145 * - pending work-to-be-done flags are in LSW
146 * - other flags in MSW
147 */
148#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
Stephane Eraniana583f1b2007-07-31 00:38:00 -0700149#define TIF_SIGPENDING 1 /* signal pending */
150#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
151#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
152#define TIF_IRET 4 /* return with iret */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
154 /* 31..28 fault code */
155#define TIF_MEMDIE 17
156
157#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
159#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
160#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
161#define _TIF_IRET (1<<TIF_IRET)
162#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
163
164#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
165#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
166
167/*
168 * Thread-synchronous status.
169 *
170 * This is different from the flags in that nobody else
171 * ever touches our thread-synchronous status, so we don't
172 * have to worry about atomic accesses.
173 */
174#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
175
176#endif /* __KERNEL__ */
177
178#endif /* _ASM_M32R_THREAD_INFO_H */