Xenomai  3.1-devel
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 #include <asm/traps.h>
26 
27 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,4,0)
28 typedef union thread_xstate x86_fpustate;
29 #define x86_fpustate_ptr(t) ((t)->fpu.state)
30 #else
31 typedef union fpregs_state x86_fpustate;
32 #define x86_fpustate_ptr(t) ((t)->fpu.active_state)
33 #endif
34 
35 struct xnarchtcb {
36  struct xntcb core;
37 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,8,0)
38  unsigned long sp;
39  unsigned long *spp;
40  unsigned long ip;
41  unsigned long *ipp;
42 #endif
43  x86_fpustate *fpup;
44  unsigned int root_kfpu: 1;
45  unsigned int root_used_math: 1;
46  x86_fpustate *kfpu_state;
47  struct {
48  unsigned long ip;
49  unsigned long ax;
50  } mayday;
51 };
52 
53 #define xnarch_fpu_ptr(tcb) ((tcb)->fpup)
54 
55 #define xnarch_fault_regs(d) ((d)->regs)
56 #define xnarch_fault_trap(d) ((d)->exception)
57 #define xnarch_fault_code(d) ((d)->regs->orig_ax)
58 #define xnarch_fault_pc(d) ((d)->regs->ip)
59 #define xnarch_fault_fpu_p(d) ((d)->exception == X86_TRAP_NM)
60 #define xnarch_fault_pf_p(d) ((d)->exception == X86_TRAP_PF)
61 #define xnarch_fault_bp_p(d) ((current->ptrace & PT_PTRACED) && \
62  ((d)->exception == X86_TRAP_DB || (d)->exception == X86_TRAP_BP))
63 #define xnarch_fault_notify(d) (!xnarch_fault_bp_p(d))
64 
65 void xnarch_switch_fpu(struct xnthread *from, struct xnthread *to);
66 
67 int xnarch_handle_fpu_fault(struct xnthread *from,
68  struct xnthread *to, struct ipipe_trap_data *d);
69 
70 void xnarch_leave_root(struct xnthread *root);
71 
72 void xnarch_init_root_tcb(struct xnthread *thread);
73 
74 void xnarch_init_shadow_tcb(struct xnthread *thread);
75 
76 void xnarch_switch_to(struct xnthread *out, struct xnthread *in);
77 
78 static inline void xnarch_enter_root(struct xnthread *root) { }
79 
80 static inline int xnarch_escalate(void)
81 {
82  if (ipipe_root_p) {
83  ipipe_raise_irq(cobalt_pipeline.escalate_virq);
84  return 1;
85  }
86 
87  return 0;
88 }
89 
90 int mach_x86_thread_init(void);
91 void mach_x86_thread_cleanup(void);
92 
93 #endif /* !_COBALT_X86_ASM_THREAD_H */