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
14 #include <linux/stringify.h>
15 #include <asm/kmem_layout.h>
17 #define CURRENT_SHIFT KERNEL_STACK_SHIFT
20 # include <asm/processor.h>
24 * low level task data that entry.S needs immediate access to
25 * - this struct should fit entirely inside of one cache line
26 * - this struct shares the supervisor stack pages
27 * - if the contents of this structure are changed, the assembly constants
28 * must also be changed
33 #if XTENSA_HAVE_COPROCESSORS
35 typedef struct xtregs_coprocessor
{
44 } xtregs_coprocessor_t
;
49 struct task_struct
*task
; /* main task structure */
50 unsigned long flags
; /* low level flags */
51 unsigned long status
; /* thread-synchronous flags */
52 __u32 cpu
; /* current CPU */
53 __s32 preempt_count
; /* 0 => preemptable,< 0 => BUG*/
55 mm_segment_t addr_limit
; /* thread address space */
57 unsigned long cpenable
;
58 #if XCHAL_HAVE_EXCLUSIVE
59 /* result of the most recent exclusive store */
60 unsigned long atomctl8
;
63 /* Allocate storage for extra user states and coprocessor states. */
64 #if XTENSA_HAVE_COPROCESSORS
65 xtregs_coprocessor_t xtregs_cp
;
67 xtregs_user_t xtregs_user
;
73 * macros/functions for gaining access to the thread information structure
78 #define INIT_THREAD_INFO(tsk) \
83 .preempt_count = INIT_PREEMPT_COUNT, \
84 .addr_limit = KERNEL_DS, \
87 /* how to get the thread information struct from C */
88 static inline struct thread_info
*current_thread_info(void)
90 struct thread_info
*ti
;
91 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT
)"\n\t"
92 "xor %0, a1, %0" : "=&r" (ti
) : );
96 #else /* !__ASSEMBLY__ */
98 /* how to get the thread information struct from ASM */
99 #define GET_THREAD_INFO(reg,sp) \
100 extui reg, sp, 0, CURRENT_SHIFT; \
106 * thread information flags
107 * - these are process state flags that various assembly files may need to access
109 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
110 #define TIF_SIGPENDING 1 /* signal pending */
111 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
112 #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
113 #define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */
114 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
115 #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
116 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
117 #define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */
118 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
119 #define TIF_SECCOMP 10 /* secure computing */
120 #define TIF_MEMDIE 11 /* is terminating due to OOM killer */
122 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
123 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
124 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
125 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
126 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
127 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
128 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
129 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
130 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
132 #define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
133 _TIF_SYSCALL_TRACEPOINT | \
134 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
136 #define THREAD_SIZE KERNEL_STACK_SIZE
137 #define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
139 #endif /* _XTENSA_THREAD_INFO */