Add linux-next specific files for 20110831
[linux-2.6/next.git] / arch / alpha / include / asm / thread_info.h
blob28335bd40e406d54557fc17d7dbc15eae88d1a8d
1 #ifndef _ALPHA_THREAD_INFO_H
2 #define _ALPHA_THREAD_INFO_H
4 #ifdef __KERNEL__
6 #ifndef __ASSEMBLY__
7 #include <asm/processor.h>
8 #include <asm/types.h>
9 #include <asm/hwrpb.h>
10 #endif
12 #ifndef __ASSEMBLY__
13 struct thread_info {
14 struct pcb_struct pcb; /* palcode state */
16 struct task_struct *task; /* main task structure */
17 unsigned int flags; /* low level flags */
18 unsigned int ieee_state; /* see fpu.h */
20 struct exec_domain *exec_domain; /* execution domain */
21 mm_segment_t addr_limit; /* thread address space */
22 unsigned cpu; /* current CPU */
23 int preempt_count; /* 0 => preemptable, <0 => BUG */
25 int bpt_nsaved;
26 unsigned long bpt_addr[2]; /* breakpoint handling */
27 unsigned int bpt_insn[2];
29 struct restart_block restart_block;
33 * Macros/functions for gaining access to the thread information structure.
35 #define INIT_THREAD_INFO(tsk) \
36 { \
37 .task = &tsk, \
38 .exec_domain = &default_exec_domain, \
39 .addr_limit = KERNEL_DS, \
40 .preempt_count = INIT_PREEMPT_COUNT, \
41 .restart_block = { \
42 .fn = do_no_restart_syscall, \
43 }, \
46 #define init_thread_info (init_thread_union.thread_info)
47 #define init_stack (init_thread_union.stack)
49 /* How to get the thread information struct from C. */
50 register struct thread_info *__current_thread_info __asm__("$8");
51 #define current_thread_info() __current_thread_info
53 #endif /* __ASSEMBLY__ */
55 /* Thread information allocation. */
56 #define THREAD_SIZE_ORDER 1
57 #define THREAD_SIZE (2*PAGE_SIZE)
59 #define PREEMPT_ACTIVE 0x40000000
62 * Thread information flags:
63 * - these are process state flags and used from assembly
64 * - pending work-to-be-done flags come first and must be assigned to be
65 * within bits 0 to 7 to fit in and immediate operand.
66 * - ALPHA_UAC_SHIFT below must be kept consistent with the unaligned
67 * control flags.
69 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
71 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
72 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
73 #define TIF_SIGPENDING 2 /* signal pending */
74 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
75 #define TIF_POLLING_NRFLAG 8 /* poll_idle is polling NEED_RESCHED */
76 #define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
77 #define TIF_UAC_NOPRINT 10 /* ! Preserve sequence of following */
78 #define TIF_UAC_NOFIX 11 /* ! flags as they match */
79 #define TIF_UAC_SIGBUS 12 /* ! userspace part of 'osf_sysinfo' */
80 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
81 #define TIF_RESTORE_SIGMASK 14 /* restore signal mask in do_signal */
83 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
84 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
85 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
86 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
87 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
88 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
90 /* Work to do on interrupt/exception return. */
91 #define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
92 _TIF_NOTIFY_RESUME)
94 /* Work to do on any return to userspace. */
95 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
96 | _TIF_SYSCALL_TRACE)
98 #define ALPHA_UAC_SHIFT TIF_UAC_NOPRINT
99 #define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
100 1 << TIF_UAC_SIGBUS)
102 #define SET_UNALIGN_CTL(task,value) ({ \
103 task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
104 ~ALPHA_UAC_MASK) \
105 | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
106 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
107 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
108 0; })
110 #define GET_UNALIGN_CTL(task,value) ({ \
111 put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
112 >> ALPHA_UAC_SHIFT \
113 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
114 >> (ALPHA_UAC_SHIFT + 1) \
115 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
116 >> (ALPHA_UAC_SHIFT - 1), \
117 (int __user *)(value)); \
120 #endif /* __KERNEL__ */
121 #endif /* _ALPHA_THREAD_INFO_H */