2 * Thread support for the Hexagon architecture
4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #ifndef _ASM_THREAD_INFO_H
22 #define _ASM_THREAD_INFO_H
27 #include <asm/processor.h>
28 #include <asm/registers.h>
32 #define THREAD_SHIFT 12
33 #define THREAD_SIZE (1<<THREAD_SHIFT)
34 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
43 * This is union'd with the "bottom" of the kernel stack.
44 * It keeps track of thread info which is handy for routines
49 struct task_struct *task; /* main task structure */
50 struct exec_domain *exec_domain; /* execution domain */
51 unsigned long flags; /* low level flags */
52 __u32 cpu; /* current cpu */
53 int preempt_count; /* 0=>preemptible,<0=>BUG */
54 mm_segment_t addr_limit; /* segmentation sux */
56 * used for syscalls somehow;
57 * seems to have a function pointer and four arguments
59 /* Points to the current pt_regs frame */
62 * saved kernel sp at switch_to time;
63 * not sure if this is used (it's not in the VM model it seems;
69 #else /* !__ASSEMBLY__ */
71 #include <asm/asm-offsets.h>
73 #endif /* __ASSEMBLY__ */
77 #define INIT_THREAD_INFO(tsk) \
80 .exec_domain = &default_exec_domain, \
84 .addr_limit = KERNEL_DS, \
89 #define init_thread_info (init_thread_union.thread_info)
90 #define init_stack (init_thread_union.stack)
92 /* Tacky preprocessor trickery */
93 #define qqstr(s) qstr(s)
95 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
97 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
98 #define current_thread_info() __current_thread_info
100 #endif /* __ASSEMBLY__ */
103 * thread information flags
104 * - these are process state flags that various assembly files
106 * - pending work-to-be-done flags are in LSW
107 * - other flags in MSW
110 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
111 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
112 #define TIF_SIGPENDING 2 /* signal pending */
113 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
114 #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
115 #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
116 /* true if poll_idle() is polling TIF_NEED_RESCHED */
117 #define TIF_MEMDIE 17 /* OOM killer killed process */
119 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
120 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
121 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
122 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
123 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
125 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
126 #define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
128 /* work to do on any return to u-space */
129 #define _TIF_ALLWORK_MASK 0x0000FFFF
131 #endif /* __KERNEL__ */