2 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation, version 2.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
12 * NON INFRINGEMENT. See the GNU General Public License for
16 #ifndef _ASM_TILE_THREAD_INFO_H
17 #define _ASM_TILE_THREAD_INFO_H
19 #include <asm/processor.h>
24 * Low level task data that assembly code needs immediate access to.
25 * The structure is placed at the bottom of the supervisor stack.
28 struct task_struct *task; /* main task structure */
29 struct exec_domain *exec_domain; /* execution domain */
30 unsigned long flags; /* low level flags */
31 unsigned long status; /* thread-synchronous flags */
32 __u32 homecache_cpu; /* CPU we are homecached on */
33 __u32 cpu; /* current CPU */
34 int preempt_count; /* 0 => preemptable,
37 mm_segment_t addr_limit; /* thread address space
38 (KERNEL_DS or USER_DS) */
39 struct restart_block restart_block;
40 struct single_step_state *step_state; /* single step state
45 * macros/functions for gaining access to the thread information structure.
47 #define INIT_THREAD_INFO(tsk) \
50 .exec_domain = &default_exec_domain, \
53 .preempt_count = INIT_PREEMPT_COUNT, \
54 .addr_limit = KERNEL_DS, \
56 .fn = do_no_restart_syscall, \
61 #define init_thread_info (init_thread_union.thread_info)
62 #define init_stack (init_thread_union.stack)
64 #endif /* !__ASSEMBLY__ */
67 #define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
69 #define THREAD_SIZE_ORDER (0)
72 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
73 #define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
75 #define STACK_WARN (THREAD_SIZE/8)
79 /* How to get the thread information struct from C. */
80 register unsigned long stack_pointer __asm__("sp");
82 #define current_thread_info() \
83 ((struct thread_info *)(stack_pointer & -THREAD_SIZE))
85 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
86 extern struct thread_info *alloc_thread_info(struct task_struct *task);
87 extern void free_thread_info(struct thread_info *info);
89 /* Sit on a nap instruction until interrupted. */
90 extern void smp_nap(void);
92 /* Enable interrupts racelessly and nap forever: helper for cpu_idle(). */
93 extern void _cpu_idle(void);
95 /* Switch boot idle thread to a freshly-allocated stack and free old stack. */
96 extern void cpu_idle_on_new_stack(struct thread_info *old_ti,
98 unsigned long new_ss10);
100 #else /* __ASSEMBLY__ */
102 /* how to get the thread information struct from ASM */
104 #define GET_THREAD_INFO(reg) move reg, sp; mm reg, zero, LOG2_THREAD_SIZE, 63
106 #define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
109 #endif /* !__ASSEMBLY__ */
111 #define PREEMPT_ACTIVE 0x10000000
114 * Thread information flags that various assembly files may need to access.
115 * Keep flags accessed frequently in low bits, particular since it makes
116 * it easier to build constants in assembly.
118 #define TIF_SIGPENDING 0 /* signal pending */
119 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
120 #define TIF_SINGLESTEP 2 /* restore singlestep on return to
122 #define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */
123 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */
124 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
125 #define TIF_SECCOMP 6 /* secure computing */
126 #define TIF_MEMDIE 7 /* OOM killer at work */
128 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
129 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
130 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
131 #define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB)
132 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
133 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
134 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
135 #define _TIF_MEMDIE (1<<TIF_MEMDIE)
137 /* Work to do on any return to user space. */
138 #define _TIF_ALLWORK_MASK \
139 (_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|_TIF_ASYNC_TLB)
142 * Thread-synchronous status.
144 * This is different from the flags in that nobody else
145 * ever touches our thread-synchronous status, so we don't
146 * have to worry about atomic accesses.
149 #define TS_COMPAT 0x0001 /* 32-bit compatibility mode */
151 #define TS_POLLING 0x0004 /* in idle loop but not sleeping */
152 #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */
154 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
157 #define HAVE_SET_RESTORE_SIGMASK 1
158 static inline void set_restore_sigmask(void)
160 struct thread_info *ti = current_thread_info();
161 ti->status |= TS_RESTORE_SIGMASK;
162 set_bit(TIF_SIGPENDING, &ti->flags);
164 #endif /* !__ASSEMBLY__ */
166 #endif /* _ASM_TILE_THREAD_INFO_H */