4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
19 #ifndef _ASM_THREAD_INFO_H
20 #define _ASM_THREAD_INFO_H
25 #include <asm/types.h>
26 #include <asm/processor.h>
30 /* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
31 * normally, the stack is found by doing something like p + THREAD_SIZE
32 * in or32, a page is 8192 bytes, which seems like a sane size
35 #define THREAD_SIZE_ORDER 0
36 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
39 * low level task data that entry.S needs immediate access to
40 * - this struct should fit entirely inside of one cache line
41 * - this struct shares the supervisor stack pages
42 * - if the contents of this structure are changed, the assembly constants
43 * must also be changed
47 typedef unsigned long mm_segment_t;
50 struct task_struct *task; /* main task structure */
51 struct exec_domain *exec_domain; /* execution domain */
52 unsigned long flags; /* low level flags */
53 __u32 cpu; /* current CPU */
54 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */
56 mm_segment_t addr_limit; /* thread address space:
57 0-0x7FFFFFFF for user-thead
58 0-0xFFFFFFFF for kernel-thread
60 __u8 supervisor_stack[0];
62 /* saved context data */
68 * macros/functions for gaining access to the thread information structure
70 * preempt_count needs to be 1 initially, until the scheduler is functional.
73 #define INIT_THREAD_INFO(tsk) \
76 .exec_domain = &default_exec_domain, \
80 .addr_limit = KERNEL_DS, \
84 #define init_thread_info (init_thread_union.thread_info)
86 /* how to get the thread information struct from C */
87 register struct thread_info *current_thread_info_reg asm("r10");
88 #define current_thread_info() (current_thread_info_reg)
90 #define get_thread_info(ti) get_task_struct((ti)->task)
91 #define put_thread_info(ti) put_task_struct((ti)->task)
93 #endif /* !__ASSEMBLY__ */
96 * thread information flags
97 * these are process state flags that various assembly files may need to
99 * - pending work-to-be-done flags are in LSW
100 * - other flags in MSW
102 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
103 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
104 #define TIF_SIGPENDING 2 /* signal pending */
105 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
106 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user
109 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
110 #define TIF_RESTORE_SIGMASK 9
111 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED
113 #define TIF_MEMDIE 17
115 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
116 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
117 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
118 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
119 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
120 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
123 /* Work to do when returning from interrupt/exception */
124 /* For OpenRISC, this is anything in the LSW other than syscall trace */
125 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
127 #endif /* __KERNEL__ */
129 #endif /* _ASM_THREAD_INFO_H */