3 * Copyright IBM Corp. 2002, 2006
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
11 * Size of kernel stack for each process
13 #define THREAD_ORDER 2
16 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
17 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
20 #include <asm/lowcore.h>
22 #include <asm/processor.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
31 struct task_struct
*task
; /* main task structure */
32 unsigned long flags
; /* low level flags */
33 unsigned long sys_call_table
; /* System call table address */
34 unsigned int cpu
; /* current CPU */
35 int preempt_count
; /* 0 => preemptable, <0 => BUG */
36 unsigned int system_call
;
39 unsigned long last_break
; /* last breaking-event-address. */
43 * macros/functions for gaining access to the thread information structure
45 #define INIT_THREAD_INFO(tsk) \
50 .preempt_count = INIT_PREEMPT_COUNT, \
53 #define init_thread_info (init_thread_union.thread_info)
54 #define init_stack (init_thread_union.stack)
56 /* how to get the thread information struct from C */
57 static inline struct thread_info
*current_thread_info(void)
59 return (struct thread_info
*) S390_lowcore
.thread_info
;
62 void arch_release_task_struct(struct task_struct
*tsk
);
64 #define THREAD_SIZE_ORDER THREAD_ORDER
69 * thread information flags bit numbers
71 #define TIF_NOTIFY_RESUME 0 /* callback before returning to user */
72 #define TIF_SIGPENDING 1 /* signal pending */
73 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
74 #define TIF_SYSCALL_TRACE 3 /* syscall trace active */
75 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
76 #define TIF_SECCOMP 5 /* secure computing */
77 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
78 #define TIF_UPROBE 7 /* breakpointed or single-stepping */
79 #define TIF_31BIT 16 /* 32bit process */
80 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
81 #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
82 #define TIF_SINGLE_STEP 19 /* This task is single stepped */
83 #define TIF_BLOCK_STEP 20 /* This task is block stepped */
84 #define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */
86 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
87 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
88 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
89 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
90 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
91 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
92 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
93 #define _TIF_UPROBE (1<<TIF_UPROBE)
94 #define _TIF_31BIT (1<<TIF_31BIT)
95 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
97 #define is_32bit_task() (test_thread_flag(TIF_31BIT))
99 #endif /* _ASM_THREAD_INFO_H */