1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Port on Texas Instruments TMS320C6x architecture
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
6*4882a593Smuzhiyun * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Updated for 2.6.3x: Mark Salter <msalter@redhat.com>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun #ifndef _ASM_C6X_THREAD_INFO_H
11*4882a593Smuzhiyun #define _ASM_C6X_THREAD_INFO_H
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #ifdef __KERNEL__
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include <asm/page.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #ifdef CONFIG_4KSTACKS
18*4882a593Smuzhiyun #define THREAD_SIZE 4096
19*4882a593Smuzhiyun #define THREAD_SHIFT 12
20*4882a593Smuzhiyun #define THREAD_SIZE_ORDER 0
21*4882a593Smuzhiyun #else
22*4882a593Smuzhiyun #define THREAD_SIZE 8192
23*4882a593Smuzhiyun #define THREAD_SHIFT 13
24*4882a593Smuzhiyun #define THREAD_SIZE_ORDER 1
25*4882a593Smuzhiyun #endif
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define THREAD_START_SP (THREAD_SIZE - 8)
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun #ifndef __ASSEMBLY__
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun typedef struct {
32*4882a593Smuzhiyun unsigned long seg;
33*4882a593Smuzhiyun } mm_segment_t;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun /*
36*4882a593Smuzhiyun * low level task data.
37*4882a593Smuzhiyun */
38*4882a593Smuzhiyun struct thread_info {
39*4882a593Smuzhiyun struct task_struct *task; /* main task structure */
40*4882a593Smuzhiyun unsigned long flags; /* low level flags */
41*4882a593Smuzhiyun int cpu; /* cpu we're on */
42*4882a593Smuzhiyun int preempt_count; /* 0 = preemptable, <0 = BUG */
43*4882a593Smuzhiyun mm_segment_t addr_limit; /* thread address space */
44*4882a593Smuzhiyun };
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /*
47*4882a593Smuzhiyun * macros/functions for gaining access to the thread information structure
48*4882a593Smuzhiyun *
49*4882a593Smuzhiyun * preempt_count needs to be 1 initially, until the scheduler is functional.
50*4882a593Smuzhiyun */
51*4882a593Smuzhiyun #define INIT_THREAD_INFO(tsk) \
52*4882a593Smuzhiyun { \
53*4882a593Smuzhiyun .task = &tsk, \
54*4882a593Smuzhiyun .flags = 0, \
55*4882a593Smuzhiyun .cpu = 0, \
56*4882a593Smuzhiyun .preempt_count = INIT_PREEMPT_COUNT, \
57*4882a593Smuzhiyun .addr_limit = KERNEL_DS, \
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun /* get the thread information struct of current task */
61*4882a593Smuzhiyun static inline __attribute__((const))
current_thread_info(void)62*4882a593Smuzhiyun struct thread_info *current_thread_info(void)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun struct thread_info *ti;
65*4882a593Smuzhiyun asm volatile (" clr .s2 B15,0,%1,%0\n"
66*4882a593Smuzhiyun : "=b" (ti)
67*4882a593Smuzhiyun : "Iu5" (THREAD_SHIFT - 1));
68*4882a593Smuzhiyun return ti;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun #define get_thread_info(ti) get_task_struct((ti)->task)
72*4882a593Smuzhiyun #define put_thread_info(ti) put_task_struct((ti)->task)
73*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun /*
76*4882a593Smuzhiyun * thread information flag bit numbers
77*4882a593Smuzhiyun * - pending work-to-be-done flags are in LSW
78*4882a593Smuzhiyun * - other flags in MSW
79*4882a593Smuzhiyun */
80*4882a593Smuzhiyun #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
81*4882a593Smuzhiyun #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
82*4882a593Smuzhiyun #define TIF_SIGPENDING 2 /* signal pending */
83*4882a593Smuzhiyun #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
84*4882a593Smuzhiyun #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
85*4882a593Smuzhiyun #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun #define TIF_MEMDIE 17 /* OOM killer killed process */
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun #define TIF_WORK_MASK 0x00007FFE /* work on irq/exception return */
90*4882a593Smuzhiyun #define TIF_ALLWORK_MASK 0x00007FFF /* work on any return to u-space */
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun #endif /* __KERNEL__ */
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun #endif /* _ASM_C6X_THREAD_INFO_H */
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