Xenomai  3.1
thread.h
1 /*
2  * Copyright (C) 2005 Stelian Pop
3  *
4  * Xenomai is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * Xenomai is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with Xenomai; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
17  * 02111-1307, USA.
18  */
19 #ifndef _COBALT_ARM64_ASM_THREAD_H
20 #define _COBALT_ARM64_ASM_THREAD_H
21 
22 #include <linux/version.h>
23 #include <asm-generic/xenomai/thread.h>
24 
25 #if defined(CONFIG_XENO_ARCH_FPU) && LINUX_VERSION_CODE < KERNEL_VERSION(4,9,0)
26 #define ARM64_XENO_OLD_SWITCH
27 #endif
28 
29 struct xnarchtcb {
30  struct xntcb core;
31 #ifdef ARM64_XENO_OLD_SWITCH
32  struct fpsimd_state xnfpsimd_state;
33  struct fpsimd_state *fpup;
34 #define xnarch_fpu_ptr(tcb) ((tcb)->fpup)
35 #endif
36 };
37 
38 #define xnarch_fault_regs(d) ((d)->regs)
39 #define xnarch_fault_trap(d) ((d)->exception)
40 #define xnarch_fault_code(d) (0)
41 #define xnarch_fault_pc(d) ((unsigned long)((d)->regs->pc - 4)) /* XXX ? */
42 
43 #define xnarch_fault_pf_p(d) ((d)->exception == IPIPE_TRAP_ACCESS)
44 #define xnarch_fault_bp_p(d) ((current->ptrace & PT_PTRACED) && \
45  ((d)->exception == IPIPE_TRAP_BREAK || \
46  (d)->exception == IPIPE_TRAP_UNDEFINSTR))
47 
48 #define xnarch_fault_notify(d) (!xnarch_fault_bp_p(d))
49 
50 void xnarch_switch_to(struct xnthread *out, struct xnthread *in);
51 
52 static inline void xnarch_enter_root(struct xnthread *root) { }
53 
54 int xnarch_escalate(void);
55 
56 #ifdef ARM64_XENO_OLD_SWITCH
57 
58 void xnarch_init_root_tcb(struct xnthread *thread);
59 
60 void xnarch_init_shadow_tcb(struct xnthread *thread);
61 
62 void xnarch_leave_root(struct xnthread *root);
63 
64 void xnarch_switch_fpu(struct xnthread *from, struct xnthread *thread);
65 
66 #else /* !ARM64_XENO_OLD_SWITCH */
67 
68 static inline void xnarch_init_root_tcb(struct xnthread *thread) { }
69 static inline void xnarch_init_shadow_tcb(struct xnthread *thread) { }
70 static inline void xnarch_leave_root(struct xnthread *root) { }
71 static inline void xnarch_switch_fpu(struct xnthread *f, struct xnthread *t) { }
72 
73 #endif /* !ARM64_XENO_OLD_SWITCH */
74 
75 static inline int xnarch_fault_fpu_p(struct ipipe_trap_data *d)
76 {
77  return xnarch_fault_trap(d) == IPIPE_TRAP_FPU_ACC;
78 }
79 
80 static inline int
81 xnarch_handle_fpu_fault(struct xnthread *from,
82  struct xnthread *to, struct ipipe_trap_data *d)
83 {
84  return 0;
85 }
86 
87 static inline void xnarch_enable_kfpu(void) { }
88 
89 static inline void xnarch_disable_kfpu(void) { }
90 
91 #endif /* !_COBALT_ARM64_ASM_THREAD_H */