blob: 0f4fe1faf9ba46fed7f9c689f2bb2652fe25923b [file] [log] [blame]
Chris Zankel9a8fd552005-06-23 22:01:26 -07001/*
2 * include/asm-xtensa/thread_info.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_THREAD_INFO_H
12#define _XTENSA_THREAD_INFO_H
13
14#ifdef __KERNEL__
15
16#ifndef __ASSEMBLY__
17# include <asm/processor.h>
18#endif
19
20/*
21 * low level task data that entry.S needs immediate access to
22 * - this struct should fit entirely inside of one cache line
23 * - this struct shares the supervisor stack pages
24 * - if the contents of this structure are changed, the assembly constants
25 * must also be changed
26 */
27
28#ifndef __ASSEMBLY__
29
Chris Zankelc658eac2008-02-12 13:17:07 -080030#if XTENSA_HAVE_COPROCESSORS
31
32typedef struct xtregs_coprocessor {
33 xtregs_cp0_t cp0;
34 xtregs_cp1_t cp1;
35 xtregs_cp2_t cp2;
36 xtregs_cp3_t cp3;
37 xtregs_cp4_t cp4;
38 xtregs_cp5_t cp5;
39 xtregs_cp6_t cp6;
40 xtregs_cp7_t cp7;
41} xtregs_coprocessor_t;
42
43#endif
44
Chris Zankel9a8fd552005-06-23 22:01:26 -070045struct thread_info {
46 struct task_struct *task; /* main task structure */
47 struct exec_domain *exec_domain; /* execution domain */
48 unsigned long flags; /* low level flags */
49 unsigned long status; /* thread-synchronous flags */
50 __u32 cpu; /* current CPU */
51 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
52
53 mm_segment_t addr_limit; /* thread address space */
54 struct restart_block restart_block;
55
Chris Zankelc658eac2008-02-12 13:17:07 -080056 unsigned long cpenable;
Chris Zankel9a8fd552005-06-23 22:01:26 -070057
Chris Zankelc658eac2008-02-12 13:17:07 -080058 /* Allocate storage for extra user states and coprocessor states. */
59#if XTENSA_HAVE_COPROCESSORS
60 xtregs_coprocessor_t xtregs_cp;
61#endif
62 xtregs_user_t xtregs_user;
Chris Zankel9a8fd552005-06-23 22:01:26 -070063};
64
65#else /* !__ASSEMBLY__ */
66
67/* offsets into the thread_info struct for assembly code access */
68#define TI_TASK 0x00000000
69#define TI_EXEC_DOMAIN 0x00000004
70#define TI_FLAGS 0x00000008
71#define TI_STATUS 0x0000000C
72#define TI_CPU 0x00000010
73#define TI_PRE_COUNT 0x00000014
74#define TI_ADDR_LIMIT 0x00000018
75#define TI_RESTART_BLOCK 0x000001C
76
77#endif
78
79#define PREEMPT_ACTIVE 0x10000000
80
81/*
82 * macros/functions for gaining access to the thread information structure
83 *
84 * preempt_count needs to be 1 initially, until the scheduler is functional.
85 */
86
87#ifndef __ASSEMBLY__
88
89#define INIT_THREAD_INFO(tsk) \
90{ \
91 .task = &tsk, \
92 .exec_domain = &default_exec_domain, \
93 .flags = 0, \
94 .cpu = 0, \
95 .preempt_count = 1, \
96 .addr_limit = KERNEL_DS, \
97 .restart_block = { \
98 .fn = do_no_restart_syscall, \
99 }, \
100}
101
102#define init_thread_info (init_thread_union.thread_info)
103#define init_stack (init_thread_union.stack)
104
105/* how to get the thread information struct from C */
106static inline struct thread_info *current_thread_info(void)
107{
108 struct thread_info *ti;
109 __asm__("extui %0,a1,0,13\n\t"
110 "xor %0, a1, %0" : "=&r" (ti) : );
111 return ti;
112}
113
Chris Zankel9a8fd552005-06-23 22:01:26 -0700114#else /* !__ASSEMBLY__ */
115
116/* how to get the thread information struct from ASM */
117#define GET_THREAD_INFO(reg,sp) \
118 extui reg, sp, 0, 13; \
119 xor reg, sp, reg
120#endif
121
122
123/*
124 * thread information flags
125 * - these are process state flags that various assembly files may need to access
126 * - pending work-to-be-done flags are in LSW
127 * - other flags in MSW
128 */
129#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
Stephane Eraniana583f1b2007-07-31 00:38:00 -0700130#define TIF_SIGPENDING 1 /* signal pending */
131#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
132#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
133#define TIF_IRET 4 /* return with iret */
134#define TIF_MEMDIE 5
135#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
Chris Zankel9a8fd552005-06-23 22:01:26 -0700136#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
Matt Helsley83224b02008-10-18 20:27:18 -0700137#define TIF_FREEZE 17 /* is freezing for suspend */
Chris Zankel9a8fd552005-06-23 22:01:26 -0700138
139#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
Chris Zankel9a8fd552005-06-23 22:01:26 -0700140#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
141#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
142#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
143#define _TIF_IRET (1<<TIF_IRET)
144#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
Chris Zankelde4f6e52007-05-31 17:47:01 -0700145#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
Matt Helsley83224b02008-10-18 20:27:18 -0700146#define _TIF_FREEZE (1<<TIF_FREEZE)
Chris Zankel9a8fd552005-06-23 22:01:26 -0700147
148#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
149#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
150
151/*
152 * Thread-synchronous status.
153 *
154 * This is different from the flags in that nobody else
155 * ever touches our thread-synchronous status, so we don't
156 * have to worry about atomic accesses.
157 */
158#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
159
160#define THREAD_SIZE 8192 //(2*PAGE_SIZE)
FUJITA Tomonorib69c49b2008-07-25 01:45:40 -0700161#define THREAD_SIZE_ORDER 1
Chris Zankel9a8fd552005-06-23 22:01:26 -0700162
163#endif /* __KERNEL__ */
164#endif /* _XTENSA_THREAD_INFO */