Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#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_ORDER 1
54#define THREAD_SIZE (2*PAGE_SIZE)
55
56#endif /* __ASSEMBLY__ */
57
58#define PREEMPT_ACTIVE 0x40000000
59
60/*
61 * Thread information flags:
62 * - these are process state flags and used from assembly
63 * - pending work-to-be-done flags come first to fit in and immediate operand.
64 *
65 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
66 */
67#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
68#define TIF_SIGPENDING 1 /* signal pending */
69#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
70#define TIF_POLLING_NRFLAG 3 /* poll_idle is polling NEED_RESCHED */
71#define TIF_DIE_IF_KERNEL 4 /* dik recursion lock */
72#define TIF_UAC_NOPRINT 5 /* see sysinfo.h */
73#define TIF_UAC_NOFIX 6
74#define TIF_UAC_SIGBUS 7
75#define TIF_MEMDIE 8
76#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
77
78#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
79#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
80#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
81#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
82#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
83
84/* Work to do on interrupt/exception return. */
85#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
86
87/* Work to do on any return to userspace. */
88#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
89 | _TIF_SYSCALL_TRACE)
90
91#define ALPHA_UAC_SHIFT 6
92#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
93 1 << TIF_UAC_SIGBUS)
94
95#define SET_UNALIGN_CTL(task,value) ({ \
96 task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
97 ~ALPHA_UAC_MASK) \
98 | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
99 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
100 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
101 0; })
102
103#define GET_UNALIGN_CTL(task,value) ({ \
104 put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
105 >> ALPHA_UAC_SHIFT \
106 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
107 >> (ALPHA_UAC_SHIFT + 1) \
108 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
109 >> (ALPHA_UAC_SHIFT - 1), \
110 (int __user *)(value)); \
111 })
112
113#endif /* __KERNEL__ */
114#endif /* _ALPHA_THREAD_INFO_H */