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1 | /* |
2 | * include/asm-v850/thread_info.h -- v850 low-level thread information | |
3 | * | |
4 | * Copyright (C) 2002 NEC Corporation | |
5 | * Copyright (C) 2002 Miles Bader <miles@gnu.org> | |
6 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
7 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General | |
10 | * Public License. See the file COPYING in the main directory of this | |
11 | * archive for more details. | |
12 | * | |
13 | * This file was derived from the PPC version, include/asm-ppc/thread_info.h | |
14 | * which was adapted from the i386 version by Paul Mackerras | |
15 | */ | |
16 | ||
17 | #ifndef __V850_THREAD_INFO_H__ | |
18 | #define __V850_THREAD_INFO_H__ | |
19 | ||
20 | #ifdef __KERNEL__ | |
21 | ||
22 | #ifndef __ASSEMBLY__ | |
23 | ||
24 | /* | |
25 | * low level task data. | |
26 | * If you change this, change the TI_* offsets below to match. | |
27 | */ | |
28 | struct thread_info { | |
29 | struct task_struct *task; /* main task structure */ | |
30 | struct exec_domain *exec_domain; /* execution domain */ | |
31 | unsigned long flags; /* low level flags */ | |
32 | int cpu; /* cpu we're on */ | |
dcd497f9 JJ |
33 | int preempt_count; /* 0 => preemptable, |
34 | <0 => BUG */ | |
1da177e4 LT |
35 | struct restart_block restart_block; |
36 | }; | |
37 | ||
38 | #define INIT_THREAD_INFO(tsk) \ | |
39 | { \ | |
40 | .task = &tsk, \ | |
41 | .exec_domain = &default_exec_domain, \ | |
42 | .flags = 0, \ | |
43 | .cpu = 0, \ | |
44 | .preempt_count = 1, \ | |
45 | .restart_block = { \ | |
46 | .fn = do_no_restart_syscall, \ | |
47 | }, \ | |
48 | } | |
49 | ||
50 | #define init_thread_info (init_thread_union.thread_info) | |
51 | #define init_stack (init_thread_union.stack) | |
52 | ||
53 | /* | |
54 | * macros/functions for gaining access to the thread information structure | |
55 | */ | |
56 | ||
57 | /* thread information allocation */ | |
58 | #define alloc_thread_info(tsk) ((struct thread_info *) \ | |
59 | __get_free_pages(GFP_KERNEL, 1)) | |
60 | #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) | |
1da177e4 LT |
61 | |
62 | #endif /* __ASSEMBLY__ */ | |
63 | ||
64 | ||
65 | /* | |
66 | * Offsets in thread_info structure, used in assembly code | |
67 | */ | |
68 | #define TI_TASK 0 | |
69 | #define TI_EXECDOMAIN 4 | |
70 | #define TI_FLAGS 8 | |
71 | #define TI_CPU 12 | |
72 | #define TI_PREEMPT 16 | |
73 | ||
74 | #define PREEMPT_ACTIVE 0x4000000 | |
75 | ||
76 | /* | |
77 | * thread information flag bit numbers | |
78 | */ | |
79 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
a583f1b5 SE |
80 | #define TIF_SIGPENDING 1 /* signal pending */ |
81 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
82 | #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling | |
1da177e4 | 83 | TIF_NEED_RESCHED */ |
a583f1b5 | 84 | #define TIF_MEMDIE 4 |
1da177e4 LT |
85 | |
86 | /* as above, but as bit values */ | |
87 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
1da177e4 LT |
88 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
89 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
90 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
91 | ||
92 | ||
93 | /* Size of kernel stack for each process. */ | |
94 | #define THREAD_SIZE 0x2000 | |
95 | ||
96 | /* The alignment of kernel threads, with thread_info structures at their | |
97 | base. Thus, a pointer for a task's task structure can be derived from | |
98 | its kernel stack pointer. */ | |
99 | #define THREAD_ALIGNMENT THREAD_SIZE | |
100 | #define THREAD_MASK (-THREAD_ALIGNMENT) | |
101 | ||
102 | ||
103 | #ifdef __ASSEMBLY__ | |
104 | ||
105 | /* Put a pointer to the current thread_info structure into REG. Note that | |
106 | this definition requires THREAD_MASK to be representable as a signed | |
107 | 16-bit value. */ | |
108 | #define GET_CURRENT_THREAD(reg) \ | |
109 | /* Use `addi' and then `and' instead of just `andi', because \ | |
110 | `addi' sign-extends the immediate value, whereas `andi' \ | |
111 | zero-extends it. */ \ | |
112 | addi THREAD_MASK, r0, reg; \ | |
113 | and sp, reg | |
114 | ||
115 | #else | |
116 | ||
117 | /* Return a pointer to the current thread_info structure. */ | |
118 | static inline struct thread_info *current_thread_info (void) | |
119 | { | |
120 | register unsigned long sp __asm__ ("sp"); | |
121 | return (struct thread_info *)(sp & THREAD_MASK); | |
122 | } | |
123 | ||
124 | #endif /* __ASSEMBLY__ */ | |
125 | ||
126 | ||
127 | #endif /* __KERNEL__ */ | |
128 | ||
129 | #endif /* __V850_THREAD_INFO_H__ */ |