[PATCH] m32r: fix #if warnings
[linux-2.6.git] / include / asm-m32r / thread_info.h
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 /*
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 */
84 static 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 */
98 #ifdef CONFIG_DEBUG_STACK_USAGE
99 #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)
113 #define get_thread_info(ti) get_task_struct((ti)->task)
114 #define put_thread_info(ti) put_task_struct((ti)->task)
115
116 #define TI_FLAG_FAULT_CODE_SHIFT        28
117
118 static inline void set_thread_fault_code(unsigned int val)
119 {
120         struct thread_info *ti = current_thread_info();
121         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
122                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
123 }
124
125 static inline unsigned int get_thread_fault_code(void)
126 {
127         struct thread_info *ti = current_thread_info();
128         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
129 }
130
131 #else /* !__ASSEMBLY__ */
132
133 #define THREAD_SIZE     8192
134
135 /* how to get the thread information struct from ASM */
136 #define GET_THREAD_INFO(reg)    GET_THREAD_INFO reg
137         .macro GET_THREAD_INFO reg
138         ldi     \reg, #-THREAD_SIZE
139         and     \reg, sp
140         .endm
141
142 #endif
143
144 /*
145  * thread information flags
146  * - these are process state flags that various assembly files may need to access
147  * - pending work-to-be-done flags are in LSW
148  * - other flags in MSW
149  */
150 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
151 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
152 #define TIF_SIGPENDING          2       /* signal pending */
153 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
154 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
155 #define TIF_IRET                5       /* return with iret */
156 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
157                                         /* 31..28 fault code */
158 #define TIF_MEMDIE              17
159
160 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
161 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
162 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
163 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
164 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
165 #define _TIF_IRET               (1<<TIF_IRET)
166 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
167
168 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
169 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
170
171 /*
172  * Thread-synchronous status.
173  *
174  * This is different from the flags in that nobody else
175  * ever touches our thread-synchronous status, so we don't
176  * have to worry about atomic accesses.
177  */
178 #define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
179
180 #endif /* __KERNEL__ */
181
182 #endif /* _ASM_M32R_THREAD_INFO_H */