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_ORDER 0
24 #else
25 #define THREAD_SIZE 8192
26 #define THREAD_SHIFT 13
27 #define THREAD_ORDER 1
28 #endif
29
30 #define THREAD_START_SP (THREAD_SIZE - 8)
31
32 #ifndef __ASSEMBLY__
33
34 typedef struct {
35 unsigned long seg;
36 } mm_segment_t;
37
38 /*
39 * low level task data.
40 */
41 struct thread_info {
42 struct task_struct *task; /* main task structure */
43 struct exec_domain *exec_domain; /* execution domain */
44 unsigned long flags; /* low level flags */
45 int cpu; /* cpu we're on */
46 int preempt_count; /* 0 = preemptable, <0 = BUG */
47 mm_segment_t addr_limit; /* thread address space */
48 struct restart_block restart_block;
49 };
50
51 /*
52 * macros/functions for gaining access to the thread information structure
53 *
54 * preempt_count needs to be 1 initially, until the scheduler is functional.
55 */
56 #define INIT_THREAD_INFO(tsk) \
57 { \
58 .task = &tsk, \
59 .exec_domain = &default_exec_domain, \
60 .flags = 0, \
61 .cpu = 0, \
62 .preempt_count = INIT_PREEMPT_COUNT, \
63 .addr_limit = KERNEL_DS, \
64 .restart_block = { \
65 .fn = do_no_restart_syscall, \
66 }, \
67 }
68
69 #define init_thread_info (init_thread_union.thread_info)
70 #define init_stack (init_thread_union.stack)
71
72 /* get the thread information struct of current task */
73 static inline __attribute__((const))
current_thread_info(void)74 struct thread_info *current_thread_info(void)
75 {
76 struct thread_info *ti;
77 asm volatile (" clr .s2 B15,0,%1,%0\n"
78 : "=b" (ti)
79 : "Iu5" (THREAD_SHIFT - 1));
80 return ti;
81 }
82
83 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
84
85 /* thread information allocation */
86 #ifdef CONFIG_DEBUG_STACK_USAGE
87 #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
88 #else
89 #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK)
90 #endif
91
92 #define alloc_thread_info_node(tsk, node) \
93 ((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
94
95 #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
96 #define get_thread_info(ti) get_task_struct((ti)->task)
97 #define put_thread_info(ti) put_task_struct((ti)->task)
98 #endif /* __ASSEMBLY__ */
99
100 #define PREEMPT_ACTIVE 0x10000000
101
102 /*
103 * thread information flag bit numbers
104 * - pending work-to-be-done flags are in LSW
105 * - other flags in MSW
106 */
107 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
108 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
109 #define TIF_SIGPENDING 2 /* signal pending */
110 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
111 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
112
113 #define TIF_POLLING_NRFLAG 16 /* true if polling TIF_NEED_RESCHED */
114 #define TIF_MEMDIE 17 /* OOM killer killed process */
115
116 #define TIF_WORK_MASK 0x00007FFE /* work on irq/exception return */
117 #define TIF_ALLWORK_MASK 0x00007FFF /* work on any return to u-space */
118
119 #endif /* __KERNEL__ */
120
121 #endif /* _ASM_C6X_THREAD_INFO_H */
122