1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2002-2003 Hewlett-Packard Co
4  *	David Mosberger-Tang <davidm@hpl.hp.com>
5  */
6 #ifndef _ASM_IA64_THREAD_INFO_H
7 #define _ASM_IA64_THREAD_INFO_H
8 
9 #ifndef ASM_OFFSETS_C
10 #include <asm/asm-offsets.h>
11 #endif
12 #include <asm/processor.h>
13 #include <asm/ptrace.h>
14 
15 #define THREAD_SIZE			KERNEL_STACK_SIZE
16 
17 #ifndef __ASSEMBLY__
18 
19 /*
20  * On IA-64, we want to keep the task structure and kernel stack together, so they can be
21  * mapped by a single TLB entry and so they can be addressed by the "current" pointer
22  * without having to do pointer masking.
23  */
24 struct thread_info {
25 	struct task_struct *task;	/* XXX not really needed, except for dup_task_struct() */
26 	__u32 flags;			/* thread_info flags (see TIF_*) */
27 	__u32 cpu;			/* current CPU */
28 	__u32 last_cpu;			/* Last CPU thread ran on */
29 	__u32 status;			/* Thread synchronous flags */
30 	mm_segment_t addr_limit;	/* user-level address space limit */
31 	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
32 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
33 	__u64 utime;
34 	__u64 stime;
35 	__u64 gtime;
36 	__u64 hardirq_time;
37 	__u64 softirq_time;
38 	__u64 idle_time;
39 	__u64 ac_stamp;
40 	__u64 ac_leave;
41 	__u64 ac_stime;
42 	__u64 ac_utime;
43 #endif
44 };
45 
46 #define INIT_THREAD_INFO(tsk)			\
47 {						\
48 	.task		= &tsk,			\
49 	.flags		= 0,			\
50 	.cpu		= 0,			\
51 	.addr_limit	= KERNEL_DS,		\
52 	.preempt_count	= INIT_PREEMPT_COUNT,	\
53 }
54 
55 #ifndef ASM_OFFSETS_C
56 /* how to get the thread information struct from C */
57 #define current_thread_info()	((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
58 #define alloc_thread_stack_node(tsk, node)	\
59 		((unsigned long *) ((char *) (tsk) + IA64_TASK_SIZE))
60 #define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
61 #else
62 #define current_thread_info()	((struct thread_info *) 0)
63 #define alloc_thread_stack_node(tsk, node)	((unsigned long *) 0)
64 #define task_thread_info(tsk)	((struct thread_info *) 0)
65 #endif
66 #define free_thread_stack(tsk)	/* nothing */
67 #define task_stack_page(tsk)	((void *)(tsk))
68 
69 #define __HAVE_THREAD_FUNCTIONS
70 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
71 #define setup_thread_stack(p, org)			\
72 	*task_thread_info(p) = *task_thread_info(org);	\
73 	task_thread_info(p)->ac_stime = 0;		\
74 	task_thread_info(p)->ac_utime = 0;		\
75 	task_thread_info(p)->task = (p);
76 #else
77 #define setup_thread_stack(p, org) \
78 	*task_thread_info(p) = *task_thread_info(org); \
79 	task_thread_info(p)->task = (p);
80 #endif
81 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
82 
83 #define alloc_task_struct_node(node)						\
84 ({										\
85 	struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,	\
86 					     KERNEL_STACK_SIZE_ORDER);		\
87 	struct task_struct *ret = page ? page_address(page) : NULL;		\
88 										\
89 	ret;									\
90 })
91 #define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
92 
93 #endif /* !__ASSEMBLY */
94 
95 /*
96  * thread information flags
97  * - these are process state flags that various assembly files may need to access
98  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
99  *   in top 16 bits
100  */
101 #define TIF_SIGPENDING		0	/* signal pending */
102 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
103 #define TIF_SYSCALL_TRACE	2	/* syscall trace active */
104 #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
105 #define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
106 #define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
107 #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
108 #define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
109 #define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
110 #define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */
111 #define TIF_POLLING_NRFLAG	22	/* idle is polling for TIF_NEED_RESCHED */
112 
113 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
114 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
115 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
116 #define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
117 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
118 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
119 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
120 #define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
121 #define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
122 #define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
123 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
124 
125 /* "work to do on user-return" bits */
126 #define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
127 				 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
128 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
129 #define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
130 
131 #endif /* _ASM_IA64_THREAD_INFO_H */
132