2 * Copyright (C) 2002-2003 Hewlett-Packard Co
3 * David Mosberger-Tang <davidm@hpl.hp.com>
5 #ifndef _ASM_IA64_THREAD_INFO_H
6 #define _ASM_IA64_THREAD_INFO_H
8 #include <asm/offsets.h>
9 #include <asm/processor.h>
10 #include <asm/ptrace.h>
13 #define TI_EXEC_DOMAIN 0x08
16 #define TI_ADDR_LIMIT 0x18
17 #define TI_PRE_COUNT 0x20
18 #define TI_RESTART_BLOCK 0x28
20 #define PREEMPT_ACTIVE_BIT 30
21 #define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
26 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
27 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
28 * without having to do pointer masking.
31 struct task_struct *task; /* XXX not really needed, except for dup_task_struct() */
32 struct exec_domain *exec_domain;/* execution domain */
33 __u32 flags; /* thread_info flags (see TIF_*) */
34 __u32 cpu; /* current CPU */
35 mm_segment_t addr_limit; /* user-level address space limit */
36 __s32 preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
37 struct restart_block restart_block;
40 #define THREAD_SIZE KERNEL_STACK_SIZE
42 #define INIT_THREAD_INFO(tsk) \
45 .exec_domain = &default_exec_domain, \
48 .addr_limit = KERNEL_DS, \
51 .fn = do_no_restart_syscall, \
55 /* how to get the thread information struct from C */
56 #define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
57 #define alloc_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
58 #define free_thread_info(ti) /* nothing */
60 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
61 #define alloc_task_struct() ((task_t *)__get_free_pages(GFP_KERNEL, KERNEL_STACK_SIZE_ORDER))
62 #define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
64 #endif /* !__ASSEMBLY */
67 * thread information flags
68 * - these are process state flags that various assembly files may need to access
69 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
72 #define TIF_NOTIFY_RESUME 0 /* resumption notification requested */
73 #define TIF_SIGPENDING 1 /* signal pending */
74 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
75 #define TIF_SYSCALL_TRACE 3 /* syscall trace active */
76 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
78 #define TIF_WORK_MASK 0x7 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE */
79 #define TIF_ALLWORK_MASK 0xf /* bits 0..3 are "work to do on user-return" bits */
81 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
82 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
83 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
84 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
85 #define _TIF_USEDFPU (1 << TIF_USEDFPU)
86 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
88 #endif /* _ASM_IA64_THREAD_INFO_H */