fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-x86 / thread_info_64.h
blobbeae2bfb62cacdc7aa6705be207a59b11edea1ae
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
5 */
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
10 #ifdef __KERNEL__
12 #include <asm/page.h>
13 #include <asm/types.h>
14 #include <asm/pda.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
21 #ifndef __ASSEMBLY__
22 struct task_struct;
23 struct exec_domain;
24 #include <asm/mmsegment.h>
26 struct thread_info {
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;
37 #endif
40 * macros/functions for gaining access to the thread information structure
41 * preempt_count needs to be 1 initially, until the scheduler is functional.
43 #ifndef __ASSEMBLY__
44 #define INIT_THREAD_INFO(tsk) \
45 { \
46 .task = &tsk, \
47 .exec_domain = &default_exec_domain, \
48 .flags = 0, \
49 .cpu = 0, \
50 .preempt_count = 1, \
51 .addr_limit = KERNEL_DS, \
52 .restart_block = { \
53 .fn = do_no_restart_syscall, \
54 }, \
57 #define init_thread_info (init_thread_union.thread_info)
58 #define init_stack (init_thread_union.stack)
60 static inline struct thread_info *current_thread_info(void)
62 struct thread_info *ti;
63 ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
64 return ti;
67 /* do not use in interrupt context */
68 static inline struct thread_info *stack_thread_info(void)
70 struct thread_info *ti;
71 __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
72 return ti;
75 /* thread information allocation */
76 #ifdef CONFIG_DEBUG_STACK_USAGE
77 #define alloc_thread_info(tsk) \
78 ({ \
79 struct thread_info *ret; \
81 ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
82 if (ret) \
83 memset(ret, 0, THREAD_SIZE); \
84 ret; \
86 #else
87 #define alloc_thread_info(tsk) \
88 ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
89 #endif
91 #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
93 #else /* !__ASSEMBLY__ */
95 /* how to get the thread information struct from ASM */
96 #define GET_THREAD_INFO(reg) \
97 movq %gs:pda_kernelstack,reg ; \
98 subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
100 #endif
103 * thread information flags
104 * - these are process state flags that various assembly files may need to access
105 * - pending work-to-be-done flags are in LSW
106 * - other flags in MSW
107 * Warning: layout of LSW is hardcoded in entry.S
109 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
110 #define TIF_SIGPENDING 2 /* signal pending */
111 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
112 #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
113 #define TIF_IRET 5 /* force IRET */
114 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
115 #define TIF_SECCOMP 8 /* secure computing */
116 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
117 #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
118 /* 16 free */
119 #define TIF_IA32 17 /* 32bit process */
120 #define TIF_FORK 18 /* ret_from_fork */
121 #define TIF_ABI_PENDING 19
122 #define TIF_MEMDIE 20
123 #define TIF_DEBUG 21 /* uses debug registers */
124 #define TIF_IO_BITMAP 22 /* uses I/O bitmap */
125 #define TIF_FREEZE 23 /* is freezing for suspend */
127 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
128 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
129 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
130 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
131 #define _TIF_IRET (1<<TIF_IRET)
132 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
133 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
134 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
135 #define _TIF_MCE_NOTIFY (1<<TIF_MCE_NOTIFY)
136 #define _TIF_IA32 (1<<TIF_IA32)
137 #define _TIF_FORK (1<<TIF_FORK)
138 #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
139 #define _TIF_DEBUG (1<<TIF_DEBUG)
140 #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
141 #define _TIF_FREEZE (1<<TIF_FREEZE)
143 /* work to do on interrupt/exception return */
144 #define _TIF_WORK_MASK \
145 (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
146 /* work to do on any return to user space */
147 #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
149 /* flags to check in __switch_to() */
150 #define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)
152 #define PREEMPT_ACTIVE 0x10000000
155 * Thread-synchronous status.
157 * This is different from the flags in that nobody else
158 * ever touches our thread-synchronous status, so we don't
159 * have to worry about atomic accesses.
161 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
162 #define TS_COMPAT 0x0002 /* 32bit syscall active */
163 #define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */
165 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
167 #endif /* __KERNEL__ */
169 #endif /* _ASM_THREAD_INFO_H */