2 * include/asm-xtensa/thread_info.h
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
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 #ifndef _XTENSA_THREAD_INFO_H
12 #define _XTENSA_THREAD_INFO_H
17 # include <asm/processor.h>
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
30 #if XTENSA_HAVE_COPROCESSORS
32 typedef struct xtregs_coprocessor {
41 } xtregs_coprocessor_t;
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*/
53 mm_segment_t addr_limit; /* thread address space */
54 struct restart_block restart_block;
56 unsigned long cpenable;
58 /* Allocate storage for extra user states and coprocessor states. */
59 #if XTENSA_HAVE_COPROCESSORS
60 xtregs_coprocessor_t xtregs_cp;
62 xtregs_user_t xtregs_user;
65 #else /* !__ASSEMBLY__ */
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
80 * macros/functions for gaining access to the thread information structure
85 #define INIT_THREAD_INFO(tsk) \
88 .exec_domain = &default_exec_domain, \
91 .preempt_count = INIT_PREEMPT_COUNT, \
92 .addr_limit = KERNEL_DS, \
94 .fn = do_no_restart_syscall, \
98 #define init_thread_info (init_thread_union.thread_info)
99 #define init_stack (init_thread_union.stack)
101 /* how to get the thread information struct from C */
102 static inline struct thread_info *current_thread_info(void)
104 struct thread_info *ti;
105 __asm__("extui %0,a1,0,13\n\t"
106 "xor %0, a1, %0" : "=&r" (ti) : );
110 #else /* !__ASSEMBLY__ */
112 /* how to get the thread information struct from ASM */
113 #define GET_THREAD_INFO(reg,sp) \
114 extui reg, sp, 0, 13; \
120 * thread information flags
121 * - these are process state flags that various assembly files may need to access
122 * - pending work-to-be-done flags are in LSW
123 * - other flags in MSW
125 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
126 #define TIF_SIGPENDING 1 /* signal pending */
127 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
128 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
129 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */
130 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
131 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
133 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
134 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
135 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
136 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
138 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
139 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
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.
148 #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
150 #define THREAD_SIZE 8192 //(2*PAGE_SIZE)
151 #define THREAD_SIZE_ORDER 1
153 #endif /* __KERNEL__ */
154 #endif /* _XTENSA_THREAD_INFO */