1 /* thread_info.h: CRIS low-level thread information
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 * CRIS port by Axis Communications
9 #ifndef _ASM_THREAD_INFO_H
10 #define _ASM_THREAD_INFO_H
14 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
17 #include <asm/types.h>
18 #include <asm/processor.h>
19 #include <asm/arch/thread_info.h>
20 #include <asm/segment.h>
25 * low level task data that entry.S needs immediate access to
26 * - this struct should fit entirely inside of one cache line
27 * - this struct shares the supervisor stack pages
28 * - if the contents of this structure are changed, the assembly constants must also be changed
32 struct task_struct *task; /* main task structure */
33 struct exec_domain *exec_domain; /* execution domain */
34 unsigned long flags; /* low level flags */
35 __u32 cpu; /* current CPU */
36 int preempt_count; /* 0 => preemptable, <0 => BUG */
37 __u32 tls; /* TLS for this thread */
39 mm_segment_t addr_limit; /* thread address space:
40 0-0xBFFFFFFF for user-thead
41 0-0xFFFFFFFF for kernel-thread
43 struct restart_block restart_block;
44 __u8 supervisor_stack[0];
49 #define PREEMPT_ACTIVE 0x10000000
52 * macros/functions for gaining access to the thread information structure
54 * preempt_count needs to be 1 initially, until the scheduler is functional.
57 #define INIT_THREAD_INFO(tsk) \
60 .exec_domain = &default_exec_domain, \
64 .addr_limit = KERNEL_DS, \
66 .fn = do_no_restart_syscall, \
70 #define init_thread_info (init_thread_union.thread_info)
72 /* thread information allocation */
73 #define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
74 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
76 #endif /* !__ASSEMBLY__ */
79 * thread information flags
80 * - these are process state flags that various assembly files may need to access
81 * - pending work-to-be-done flags are in LSW
82 * - other flags in MSW
84 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
85 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
86 #define TIF_SIGPENDING 2 /* signal pending */
87 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
88 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
89 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
91 #define TIF_FREEZE 18 /* is freezing for suspend */
93 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
94 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
95 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
96 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
97 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
98 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
99 #define _TIF_FREEZE (1<<TIF_FREEZE)
101 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
102 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
104 #endif /* __KERNEL__ */
106 #endif /* _ASM_THREAD_INFO_H */