Xenomai  3.0-rc7
thread.h
1 /*
2  * Copyright (C) 2001-2013 Philippe Gerum <rpm@xenomai.org>.
3  * Copyright (C) 2004-2006 Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>.
4  *
5  * Xenomai is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * Xenomai is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with Xenomai; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
18  * 02111-1307, USA.
19  */
20 #ifndef _COBALT_X86_ASM_THREAD_H
21 #define _COBALT_X86_ASM_THREAD_H
22 
23 #include <asm-generic/xenomai/thread.h>
24 #include <asm/xenomai/wrappers.h>
25 
26 typedef union thread_xstate x86_fpustate;
27 #define x86_fpustate_ptr(t) ((t)->fpu.state)
28 
29 struct xnarchtcb {
30  x86_fpustate i387;
31  struct xntcb core;
32  unsigned long sp;
33  unsigned long *spp;
34  unsigned long ip;
35  unsigned long *ipp;
36  x86_fpustate *fpup;
37  unsigned int root_kfpu: 1;
38  unsigned int root_used_math: 1;
39  struct {
40  unsigned long ip;
41  unsigned long ax;
42  } mayday;
43 };
44 
45 static inline int xnarch_shadow_p(struct xnarchtcb *tcb, struct task_struct *task)
46 {
47  return tcb->spp == &task->thread.sp;
48 }
49 
50 #define xnarch_fpu_ptr(tcb) ((tcb)->fpup)
51 
52 #define xnarch_fault_regs(d) ((d)->regs)
53 #define xnarch_fault_trap(d) ((d)->exception)
54 #define xnarch_fault_code(d) ((d)->regs->orig_ax)
55 #define xnarch_fault_pc(d) ((d)->regs->ip)
56 #define xnarch_fault_fpu_p(d) ((d)->exception == 7)
57 #define xnarch_fault_pf_p(d) ((d)->exception == 14)
58 #define xnarch_fault_bp_p(d) ((current->ptrace & PT_PTRACED) && \
59  ((d)->exception == 1 || (d)->exception == 3))
60 #define xnarch_fault_notify(d) (!xnarch_fault_bp_p(d))
61 
62 void xnarch_save_fpu(struct xnthread *thread);
63 
64 void xnarch_switch_fpu(struct xnthread *from, struct xnthread *to);
65 
66 int xnarch_handle_fpu_fault(struct xnthread *from,
67  struct xnthread *to, struct ipipe_trap_data *d);
68 
69 void xnarch_leave_root(struct xnthread *root);
70 
71 void xnarch_init_root_tcb(struct xnthread *thread);
72 
73 void xnarch_init_shadow_tcb(struct xnthread *thread);
74 
75 void xnarch_switch_to(struct xnthread *out, struct xnthread *in);
76 
77 static inline void xnarch_enter_root(struct xnthread *root) { }
78 
79 int xnarch_escalate(void);
80 
81 #endif /* !_COBALT_X86_ASM_THREAD_H */