blob: d51491ed00b81de8ae49426d5cc07e6c6fa97f5a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ALPHA_THREAD_INFO_H
2#define _ALPHA_THREAD_INFO_H
3
4#ifdef __KERNEL__
5
6#ifndef __ASSEMBLY__
7#include <asm/processor.h>
8#include <asm/types.h>
9#include <asm/hwrpb.h>
10#endif
11
12#ifndef __ASSEMBLY__
13struct thread_info {
14 struct pcb_struct pcb; /* palcode state */
15
16 struct task_struct *task; /* main task structure */
17 unsigned int flags; /* low level flags */
18 unsigned int ieee_state; /* see fpu.h */
19
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 */
24
25 int bpt_nsaved;
26 unsigned long bpt_addr[2]; /* breakpoint handling */
27 unsigned int bpt_insn[2];
28
29 struct restart_block restart_block;
30};
31
32/*
33 * Macros/functions for gaining access to the thread information structure.
34 */
35#define INIT_THREAD_INFO(tsk) \
36{ \
37 .task = &tsk, \
38 .exec_domain = &default_exec_domain, \
39 .addr_limit = KERNEL_DS, \
40 .restart_block = { \
41 .fn = do_no_restart_syscall, \
42 }, \
43}
44
45#define init_thread_info (init_thread_union.thread_info)
46#define init_stack (init_thread_union.stack)
47
48/* How to get the thread information struct from C. */
49register struct thread_info *__current_thread_info __asm__("$8");
50#define current_thread_info() __current_thread_info
51
52/* Thread information allocation. */
53#define THREAD_SIZE (2*PAGE_SIZE)
54#define alloc_thread_info(tsk) \
55 ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
56#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
57#define get_thread_info(ti) get_task_struct((ti)->task)
58#define put_thread_info(ti) put_task_struct((ti)->task)
59
60#endif /* __ASSEMBLY__ */
61
62#define PREEMPT_ACTIVE 0x40000000
63
64/*
65 * Thread information flags:
66 * - these are process state flags and used from assembly
67 * - pending work-to-be-done flags come first to fit in and immediate operand.
68 *
69 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
70 */
71#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
72#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
73#define TIF_SIGPENDING 2 /* signal pending */
74#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
75#define TIF_POLLING_NRFLAG 4 /* poll_idle is polling NEED_RESCHED */
76#define TIF_DIE_IF_KERNEL 5 /* dik recursion lock */
77#define TIF_UAC_NOPRINT 6 /* see sysinfo.h */
78#define TIF_UAC_NOFIX 7
79#define TIF_UAC_SIGBUS 8
80#define TIF_MEMDIE 9
81
82#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
83#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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
88/* Work to do on interrupt/exception return. */
89#define _TIF_WORK_MASK (_TIF_NOTIFY_RESUME \
90 | _TIF_SIGPENDING \
91 | _TIF_NEED_RESCHED)
92
93/* Work to do on any return to userspace. */
94#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
95 | _TIF_SYSCALL_TRACE)
96
97#endif /* __KERNEL__ */
98#endif /* _ALPHA_THREAD_INFO_H */