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authorRichard Kuo <rkuo@codeaurora.org>2011-10-31 19:36:46 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 10:34:18 -0400
commit52f710249e2ec20f2d03fc31b7fb281126507097 (patch)
tree1871e9e03ddeb130af82d795d1961ef10e29d4fe /arch/hexagon
parent99a70aa051d2aef6a91761c2230264cfcf20ae74 (diff)
Hexagon: Add threadinfo
Signed-off-by: Richard Kuo <rkuo@codeaurora.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon')
-rw-r--r--arch/hexagon/include/asm/thread_info.h154
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h
new file mode 100644
index 000000000000..9c2934ff5756
--- /dev/null
+++ b/arch/hexagon/include/asm/thread_info.h
@@ -0,0 +1,154 @@
1/*
2 * Thread support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
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.
9 *
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.
14 *
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
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_THREAD_INFO_H
22#define _ASM_THREAD_INFO_H
23
24#ifdef __KERNEL__
25
26#ifndef __ASSEMBLY__
27#include <asm/processor.h>
28#include <asm/registers.h>
29#include <asm/page.h>
30#endif
31
32#define THREAD_SHIFT 12
33#define THREAD_SIZE (1<<THREAD_SHIFT)
34
35#if THREAD_SHIFT >= PAGE_SHIFT
36#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
37#else /* don't use standard allocator */
38#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
39extern struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node);
40extern void free_thread_info(struct thread_info *ti);
41#endif
42
43
44#ifndef __ASSEMBLY__
45
46typedef struct {
47 unsigned long seg;
48} mm_segment_t;
49
50/*
51 * This is union'd with the "bottom" of the kernel stack.
52 * It keeps track of thread info which is handy for routines
53 * to access quickly.
54 */
55
56struct thread_info {
57 struct task_struct *task; /* main task structure */
58 struct exec_domain *exec_domain; /* execution domain */
59 unsigned long flags; /* low level flags */
60 __u32 cpu; /* current cpu */
61 int preempt_count; /* 0=>preemptible,<0=>BUG */
62 mm_segment_t addr_limit; /* segmentation sux */
63 /*
64 * used for syscalls somehow;
65 * seems to have a function pointer and four arguments
66 */
67 struct restart_block restart_block;
68 /* Points to the current pt_regs frame */
69 struct pt_regs *regs;
70 /*
71 * saved kernel sp at switch_to time;
72 * not sure if this is used (it's not in the VM model it seems;
73 * see thread_struct)
74 */
75 unsigned long sp;
76};
77
78#else /* !__ASSEMBLY__ */
79
80#include <asm/asm-offsets.h>
81
82#endif /* __ASSEMBLY__ */
83
84/* looks like "linux/hardirq.h" uses this. */
85
86#define PREEMPT_ACTIVE 0x10000000
87
88#ifndef __ASSEMBLY__
89
90#define INIT_THREAD_INFO(tsk) \
91{ \
92 .task = &tsk, \
93 .exec_domain = &default_exec_domain, \
94 .flags = 0, \
95 .cpu = 0, \
96 .preempt_count = 1, \
97 .addr_limit = KERNEL_DS, \
98 .restart_block = { \
99 .fn = do_no_restart_syscall, \
100 }, \
101 .sp = 0, \
102 .regs = NULL, \
103}
104
105#define init_thread_info (init_thread_union.thread_info)
106#define init_stack (init_thread_union.stack)
107
108/* Tacky preprocessor trickery */
109#define qqstr(s) qstr(s)
110#define qstr(s) #s
111#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
112
113register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
114#define current_thread_info() __current_thread_info
115
116#endif /* __ASSEMBLY__ */
117
118/*
119 * thread information flags
120 * - these are process state flags that various assembly files
121 * may need to access
122 * - pending work-to-be-done flags are in LSW
123 * - other flags in MSW
124 */
125
126#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
127#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
128#define TIF_SIGPENDING 2 /* signal pending */
129#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
130#define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
131#define TIF_IRET 5 /* return with iret */
132#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
133/* true if poll_idle() is polling TIF_NEED_RESCHED */
134#define TIF_POLLING_NRFLAG 16
135#define TIF_MEMDIE 17 /* OOM killer killed process */
136
137#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
138#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
139#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
140#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
141#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
142#define _TIF_IRET (1 << TIF_IRET)
143#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
144#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
145
146/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
147#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
148
149/* work to do on any return to u-space */
150#define _TIF_ALLWORK_MASK 0x0000FFFF
151
152#endif /* __KERNEL__ */
153
154#endif