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1da177e4 LT |
1 | /* |
2 | * thread_info.h: sparc low-level thread information | |
3 | * adapted from the ppc version by Pete Zaitcev, which was | |
4 | * adapted from the i386 version by Paul Mackerras | |
5 | * | |
6 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
7 | * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com) | |
8 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
9 | */ | |
10 | ||
11 | #ifndef _ASM_THREAD_INFO_H | |
12 | #define _ASM_THREAD_INFO_H | |
13 | ||
14 | #ifdef __KERNEL__ | |
15 | ||
16 | #ifndef __ASSEMBLY__ | |
17 | ||
18 | #include <asm/btfixup.h> | |
19 | #include <asm/ptrace.h> | |
20 | #include <asm/page.h> | |
21 | ||
22 | /* | |
23 | * Low level task data. | |
24 | * | |
25 | * If you change this, change the TI_* offsets below to match. | |
26 | */ | |
27 | #define NSWINS 8 | |
28 | struct thread_info { | |
29 | unsigned long uwinmask; | |
30 | struct task_struct *task; /* main task structure */ | |
31 | struct exec_domain *exec_domain; /* execution domain */ | |
32 | unsigned long flags; /* low level flags */ | |
33 | ||
34 | int cpu; /* cpu we're on */ | |
35 | int preempt_count; | |
36 | int softirq_count; | |
37 | int hardirq_count; | |
38 | ||
39 | /* Context switch saved kernel state. */ | |
40 | unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */ | |
41 | unsigned long kpc; | |
42 | unsigned long kpsr; | |
43 | unsigned long kwim; | |
44 | ||
45 | /* A place to store user windows and stack pointers | |
46 | * when the stack needs inspection. | |
47 | */ | |
48 | struct reg_window reg_window[NSWINS]; /* align for ldd! */ | |
49 | unsigned long rwbuf_stkptrs[NSWINS]; | |
50 | unsigned long w_saved; | |
51 | ||
52 | struct restart_block restart_block; | |
53 | }; | |
54 | ||
55 | /* | |
56 | * macros/functions for gaining access to the thread information structure | |
57 | * | |
58 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
59 | */ | |
60 | #define INIT_THREAD_INFO(tsk) \ | |
61 | { \ | |
62 | .uwinmask = 0, \ | |
63 | .task = &tsk, \ | |
64 | .exec_domain = &default_exec_domain, \ | |
65 | .flags = 0, \ | |
66 | .cpu = 0, \ | |
67 | .preempt_count = 1, \ | |
68 | .restart_block = { \ | |
69 | .fn = do_no_restart_syscall, \ | |
70 | }, \ | |
71 | } | |
72 | ||
73 | #define init_thread_info (init_thread_union.thread_info) | |
74 | #define init_stack (init_thread_union.stack) | |
75 | ||
76 | /* how to get the thread information struct from C */ | |
77 | register struct thread_info *current_thread_info_reg asm("g6"); | |
78 | #define current_thread_info() (current_thread_info_reg) | |
79 | ||
80 | /* | |
81 | * thread information allocation | |
82 | */ | |
83 | #if PAGE_SHIFT == 13 | |
84 | #define THREAD_INFO_ORDER 0 | |
85 | #else /* PAGE_SHIFT */ | |
86 | #define THREAD_INFO_ORDER 1 | |
87 | #endif | |
88 | ||
89 | BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void) | |
90 | #define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)() | |
91 | ||
92 | BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *) | |
93 | #define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti) | |
94 | ||
95 | #define get_thread_info(ti) get_task_struct((ti)->task) | |
96 | #define put_thread_info(ti) put_task_struct((ti)->task) | |
97 | ||
98 | #endif /* __ASSEMBLY__ */ | |
99 | ||
100 | /* | |
101 | * Size of kernel stack for each process. | |
102 | * Observe the order of get_free_pages() in alloc_thread_info(). | |
103 | * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste. | |
104 | */ | |
105 | #define THREAD_SIZE 8192 | |
106 | ||
107 | /* | |
108 | * Offsets in thread_info structure, used in assembly code | |
109 | * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications. | |
110 | */ | |
111 | #define TI_UWINMASK 0x00 /* uwinmask */ | |
112 | #define TI_TASK 0x04 | |
113 | #define TI_EXECDOMAIN 0x08 /* exec_domain */ | |
114 | #define TI_FLAGS 0x0c | |
115 | #define TI_CPU 0x10 | |
116 | #define TI_PREEMPT 0x14 /* preempt_count */ | |
117 | #define TI_SOFTIRQ 0x18 /* softirq_count */ | |
118 | #define TI_HARDIRQ 0x1c /* hardirq_count */ | |
119 | #define TI_KSP 0x20 /* ksp */ | |
120 | #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */ | |
121 | #define TI_KPSR 0x28 /* kpsr */ | |
122 | #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */ | |
123 | #define TI_REG_WINDOW 0x30 | |
124 | #define TI_RWIN_SPTRS 0x230 | |
125 | #define TI_W_SAVED 0x250 | |
126 | /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */ | |
127 | ||
128 | #define PREEMPT_ACTIVE 0x4000000 | |
129 | ||
130 | /* | |
131 | * thread information flag bit numbers | |
132 | */ | |
133 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
134 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ | |
135 | #define TIF_SIGPENDING 2 /* signal pending */ | |
136 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
137 | #define TIF_USEDFPU 8 /* FPU was used by this task | |
138 | * this quantum (SMP) */ | |
139 | #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling | |
140 | * TIF_NEED_RESCHED */ | |
141 | #define TIF_MEMDIE 10 | |
142 | ||
143 | /* as above, but as bit values */ | |
144 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) | |
145 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) | |
146 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) | |
147 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) | |
148 | #define _TIF_USEDFPU (1<<TIF_USEDFPU) | |
149 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) | |
150 | ||
151 | #endif /* __KERNEL__ */ | |
152 | ||
153 | #endif /* _ASM_THREAD_INFO_H */ |