Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluet...
[linux-2.6] / include / asm-sparc / thread_info.h
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         int                     cpu;            /* cpu we're on */
34         int                     preempt_count;  /* 0 => preemptable,
35                                                    <0 => BUG */
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 #endif /* __ASSEMBLY__ */
96
97 /*
98  * Size of kernel stack for each process.
99  * Observe the order of get_free_pages() in alloc_thread_info().
100  * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
101  */
102 #define THREAD_SIZE             8192
103
104 /*
105  * Offsets in thread_info structure, used in assembly code
106  * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
107  */
108 #define TI_UWINMASK     0x00    /* uwinmask */
109 #define TI_TASK         0x04
110 #define TI_EXECDOMAIN   0x08    /* exec_domain */
111 #define TI_FLAGS        0x0c
112 #define TI_CPU          0x10
113 #define TI_PREEMPT      0x14    /* preempt_count */
114 #define TI_SOFTIRQ      0x18    /* softirq_count */
115 #define TI_HARDIRQ      0x1c    /* hardirq_count */
116 #define TI_KSP          0x20    /* ksp */
117 #define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
118 #define TI_KPSR         0x28    /* kpsr */
119 #define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
120 #define TI_REG_WINDOW   0x30
121 #define TI_RWIN_SPTRS   0x230
122 #define TI_W_SAVED      0x250
123 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
124
125 #define PREEMPT_ACTIVE          0x4000000
126
127 /*
128  * thread information flag bit numbers
129  */
130 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
131 /* flag bit 1 is available */
132 #define TIF_SIGPENDING          2       /* signal pending */
133 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
134 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
135 #define TIF_USEDFPU             8       /* FPU was used by this task
136                                          * this quantum (SMP) */
137 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
138                                          * TIF_NEED_RESCHED */
139 #define TIF_MEMDIE              10
140
141 /* as above, but as bit values */
142 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
143 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
144 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
145 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
146 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
147 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
148
149 #endif /* __KERNEL__ */
150
151 #endif /* _ASM_THREAD_INFO_H */