1/*
2 *  Port on Texas Instruments TMS320C6x architecture
3 *
4 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 *  Updated for 2.6.3x: Mark Salter <msalter@redhat.com>
8 *
9 *  This program is free software; you can redistribute it and/or modify
10 *  it under the terms of the GNU General Public License version 2 as
11 *  published by the Free Software Foundation.
12 */
13#ifndef _ASM_C6X_THREAD_INFO_H
14#define _ASM_C6X_THREAD_INFO_H
15
16#ifdef __KERNEL__
17
18#include <asm/page.h>
19
20#ifdef CONFIG_4KSTACKS
21#define THREAD_SIZE		4096
22#define THREAD_SHIFT		12
23#define THREAD_SIZE_ORDER	0
24#else
25#define THREAD_SIZE		8192
26#define THREAD_SHIFT		13
27#define THREAD_SIZE_ORDER	1
28#endif
29
30#define THREAD_START_SP		(THREAD_SIZE - 8)
31
32#ifndef __ASSEMBLY__
33
34typedef struct {
35	unsigned long seg;
36} mm_segment_t;
37
38/*
39 * low level task data.
40 */
41struct thread_info {
42	struct task_struct	*task;		/* main task structure */
43	unsigned long		flags;		/* low level flags */
44	int			cpu;		/* cpu we're on */
45	int			preempt_count;	/* 0 = preemptable, <0 = BUG */
46	mm_segment_t		addr_limit;	/* thread address space */
47};
48
49/*
50 * macros/functions for gaining access to the thread information structure
51 *
52 * preempt_count needs to be 1 initially, until the scheduler is functional.
53 */
54#define INIT_THREAD_INFO(tsk)			\
55{						\
56	.task		= &tsk,			\
57	.flags		= 0,			\
58	.cpu		= 0,			\
59	.preempt_count	= INIT_PREEMPT_COUNT,	\
60	.addr_limit	= KERNEL_DS,		\
61}
62
63#define init_thread_info	(init_thread_union.thread_info)
64#define init_stack		(init_thread_union.stack)
65
66/* get the thread information struct of current task */
67static inline __attribute__((const))
68struct thread_info *current_thread_info(void)
69{
70	struct thread_info *ti;
71	asm volatile (" clr   .s2 B15,0,%1,%0\n"
72		      : "=b" (ti)
73		      : "Iu5" (THREAD_SHIFT - 1));
74	return ti;
75}
76
77#define get_thread_info(ti)	get_task_struct((ti)->task)
78#define put_thread_info(ti)	put_task_struct((ti)->task)
79#endif /* __ASSEMBLY__ */
80
81/*
82 * thread information flag bit numbers
83 * - pending work-to-be-done flags are in LSW
84 * - other flags in MSW
85 */
86#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
87#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
88#define TIF_SIGPENDING		2	/* signal pending */
89#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
90#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
91
92#define TIF_MEMDIE		17	/* OOM killer killed process */
93
94#define TIF_WORK_MASK		0x00007FFE /* work on irq/exception return */
95#define TIF_ALLWORK_MASK	0x00007FFF /* work on any return to u-space */
96
97#endif /* __KERNEL__ */
98
99#endif /* _ASM_C6X_THREAD_INFO_H */
100