1 /* thread_info.h: x86_64 low-level thread information
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
13 #include <asm/types.h>
17 * low level task data that entry.S needs immediate access to
18 * - this struct should fit entirely inside of one cache line
19 * - this struct shares the supervisor stack pages
24 #include <asm/processor.h>
27 struct task_struct *task; /* main task structure */
28 struct exec_domain *exec_domain; /* execution domain */
29 __u32 flags; /* low level flags */
30 __u32 status; /* thread synchronous flags */
31 __u32 cpu; /* current CPU */
32 int preempt_count; /* 0 => preemptable, <0 => BUG */
34 mm_segment_t addr_limit;
35 struct restart_block restart_block;
36 #ifdef CONFIG_IA32_EMULATION
37 void __user *sysenter_return;
43 * macros/functions for gaining access to the thread information structure
44 * preempt_count needs to be 1 initially, until the scheduler is functional.
47 #define INIT_THREAD_INFO(tsk) \
50 .exec_domain = &default_exec_domain, \
54 .addr_limit = KERNEL_DS, \
56 .fn = do_no_restart_syscall, \
60 #define init_thread_info (init_thread_union.thread_info)
61 #define init_stack (init_thread_union.stack)
63 static inline struct thread_info *current_thread_info(void)
65 struct thread_info *ti;
66 ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
70 /* do not use in interrupt context */
71 static inline struct thread_info *stack_thread_info(void)
73 struct thread_info *ti;
74 __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
78 /* thread information allocation */
79 #ifdef CONFIG_DEBUG_STACK_USAGE
80 #define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
82 #define THREAD_FLAGS GFP_KERNEL
85 #define alloc_thread_info(tsk) \
86 ((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER))
88 #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
90 #else /* !__ASSEMBLY__ */
92 /* how to get the thread information struct from ASM */
93 #define GET_THREAD_INFO(reg) \
94 movq %gs:pda_kernelstack,reg ; \
95 subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
100 * thread information flags
101 * - these are process state flags that various assembly files may need to access
102 * - pending work-to-be-done flags are in LSW
103 * - other flags in MSW
104 * Warning: layout of LSW is hardcoded in entry.S
106 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
107 #define TIF_SIGPENDING 2 /* signal pending */
108 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
109 #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
110 #define TIF_IRET 5 /* force IRET */
111 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
112 #define TIF_SECCOMP 8 /* secure computing */
113 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
114 #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
115 #define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */
117 #define TIF_IA32 17 /* 32bit process */
118 #define TIF_FORK 18 /* ret_from_fork */
119 #define TIF_ABI_PENDING 19
120 #define TIF_MEMDIE 20
121 #define TIF_DEBUG 21 /* uses debug registers */
122 #define TIF_IO_BITMAP 22 /* uses I/O bitmap */
123 #define TIF_FREEZE 23 /* is freezing for suspend */
124 #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
125 #define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
126 #define TIF_DS_AREA_MSR 25 /* uses thread_struct.ds_area_msr */
127 #define TIF_BTS_TRACE_TS 26 /* record scheduling event timestamps */
129 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
130 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
131 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
132 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
133 #define _TIF_IRET (1<<TIF_IRET)
134 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
135 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
136 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
137 #define _TIF_MCE_NOTIFY (1<<TIF_MCE_NOTIFY)
138 #define _TIF_HRTICK_RESCHED (1<<TIF_HRTICK_RESCHED)
139 #define _TIF_IA32 (1<<TIF_IA32)
140 #define _TIF_FORK (1<<TIF_FORK)
141 #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
142 #define _TIF_DEBUG (1<<TIF_DEBUG)
143 #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
144 #define _TIF_FREEZE (1<<TIF_FREEZE)
145 #define _TIF_FORCED_TF (1<<TIF_FORCED_TF)
146 #define _TIF_DEBUGCTLMSR (1<<TIF_DEBUGCTLMSR)
147 #define _TIF_DS_AREA_MSR (1<<TIF_DS_AREA_MSR)
148 #define _TIF_BTS_TRACE_TS (1<<TIF_BTS_TRACE_TS)
150 /* work to do on interrupt/exception return */
151 #define _TIF_WORK_MASK \
152 (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
153 /* work to do on any return to user space */
154 #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
156 #define _TIF_DO_NOTIFY_MASK \
157 (_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)
159 /* flags to check in __switch_to() */
160 #define _TIF_WORK_CTXSW \
161 (_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS)
162 #define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
163 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)
165 #define PREEMPT_ACTIVE 0x10000000
168 * Thread-synchronous status.
170 * This is different from the flags in that nobody else
171 * ever touches our thread-synchronous status, so we don't
172 * have to worry about atomic accesses.
174 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
175 #define TS_COMPAT 0x0002 /* 32bit syscall active */
176 #define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */
178 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
180 #endif /* __KERNEL__ */
182 #endif /* _ASM_THREAD_INFO_H */