/usr/include/xenomai/asm-blackfin/bits/pod.h is in libxenomai-dev 2.6.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005 Philippe Gerum <rpm@xenomai.org>.
*
* Xenomai is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Xenomai is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Xenomai; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _XENO_ASM_BLACKFIN_BITS_POD_H
#define _XENO_ASM_BLACKFIN_BITS_POD_H
#include <asm-generic/xenomai/bits/pod.h>
void xnpod_welcome_thread(struct xnthread *, int);
void xnpod_delete_thread(struct xnthread *);
#ifndef CONFIG_GENERIC_CLOCKEVENTS
#define xnarch_switch_htick_mode NULL
#define xnarch_next_htick_shot NULL
#endif /* CONFIG_GENERIC_CLOCKEVENTS */
/*
* When GENERIC_CLOCKEVENTS are not available, the I-pipe frees the
* Blackfin core timer for us, therefore we don't need any host tick
* relay service since the regular Linux time source is still ticking
* in parallel at the normal pace through TIMER0.
*/
static inline int xnarch_start_timer(void (*tick_handler)(void), int cpu)
{
return rthal_timer_request(tick_handler,
xnarch_switch_htick_mode, xnarch_next_htick_shot,
cpu);
}
#define xnarch_stop_timer(cpu) rthal_timer_release(cpu)
static inline void xnarch_leave_root(xnarchtcb_t * rootcb)
{
/* Remember the preempted Linux task pointer. */
rootcb->user_task = current;
#ifdef CONFIG_MPU
rootcb->active_task = current;
#endif
rootcb->tsp = ¤t->thread;
}
static inline void xnarch_enter_root(xnarchtcb_t * rootcb)
{
}
#ifdef CONFIG_MPU
static inline
struct task_struct *mpu_get_prev(struct xnarchtcb *tcb)
{
return tcb->active_task;
}
static inline
void mpu_set_next(struct xnarchtcb *tcb,
struct task_struct *next)
{
tcb->active_task = next;
}
static inline void mpu_switch(struct task_struct *prev,
struct task_struct *next)
{
if (next && next != prev) {
struct mm_struct *oldmm = prev->active_mm;
wrap_switch_mm(oldmm, next->active_mm, next);
}
}
#else /* !CONFIG_MPU */
static inline
struct task_struct *mpu_get_prev(struct xnarchtcb *tcb)
{
return NULL;
}
static inline
void mpu_set_next(struct xnarchtcb *tcb,
struct task_struct *next)
{
}
static inline void mpu_switch(struct task_struct *prev,
struct task_struct *next)
{
}
#endif /* CONFIG_MPU */
static inline void xnarch_switch_to(xnarchtcb_t * out_tcb, xnarchtcb_t * in_tcb)
{
struct task_struct *prev = mpu_get_prev(out_tcb);
struct task_struct *next = in_tcb->user_task;
if (likely(next != NULL)) {
mpu_set_next(in_tcb, next);
rthal_clear_foreign_stack(&rthal_domain);
} else {
mpu_set_next(in_tcb, prev);
rthal_set_foreign_stack(&rthal_domain);
}
mpu_switch(prev, next);
rthal_thread_switch(out_tcb->tsp, in_tcb->tsp);
}
asmlinkage static void xnarch_thread_trampoline(xnarchtcb_t * tcb)
{
xnpod_welcome_thread(tcb->self, tcb->imask);
tcb->entry(tcb->cookie);
xnpod_delete_thread(tcb->self);
}
static inline void xnarch_init_thread(xnarchtcb_t * tcb,
void (*entry) (void *),
void *cookie,
int imask,
struct xnthread *thread, char *name)
{
unsigned long ksp, *switchregs;
ksp = (((unsigned long)tcb->stackbase + tcb->stacksize - 40) & ~0xf);
switchregs = (unsigned long *)ksp;
/*
* Stack space is guaranteed to be clear, so R7:4, P5:3, fp
* are already zero. We only need to set r0 and rets.
*/
switchregs[0] = (unsigned long)tcb; /* r0 */
switchregs[9] = (unsigned long)&xnarch_thread_trampoline; /* rets */
tcb->ts.ksp = ksp;
tcb->ts.pc = (unsigned long)&rthal_thread_trampoline;
tcb->ts.usp = 0;
tcb->entry = entry;
tcb->cookie = cookie;
tcb->self = thread;
tcb->imask = imask;
tcb->name = name;
}
#define xnarch_fpu_init_p(task) (0)
static inline void xnarch_enable_fpu(xnarchtcb_t * current_tcb)
{
}
static inline void xnarch_init_fpu(xnarchtcb_t * tcb)
{
}
static inline void xnarch_save_fpu(xnarchtcb_t * tcb)
{
}
static inline void xnarch_restore_fpu(xnarchtcb_t * tcb)
{
}
static inline int xnarch_escalate(void)
{
extern int xnarch_escalation_virq;
/* The following Blackfin-specific check is likely the most
* braindamage stuff we need to do for this arch, i.e. deferring
* Xenomai's rescheduling procedure whenever:
* 1. ILAT tells us that a deferred syscall (EVT15) is pending, so
* that we don't later execute this syscall over the wrong thread
* context. This could happen whenever a user-space task (plain or
* Xenomai) gets preempted by a high priority interrupt right
* after the deferred syscall event is raised (EVT15) but before
* the evt_system_call ISR could run. In case of deferred Xenomai
* rescheduling, the pending rescheduling opportunity will be
* checked at the beginning of Xenomai's do_hisyscall_event which
* intercepts any incoming syscall, and we know it will happen
* shortly after.
*
* 2. the context we will switch back to belongs to the Linux
* kernel code, so that we don't inadvertently cause the CPU to
* switch to user operating mode as a result of returning from an
* interrupt stack frame over the incoming thread through RTI. In
* the latter case, the preempted kernel code will be diverted
* shortly before resumption in order to run the rescheduling
* procedure (see __ipipe_irq_tail_hook).
*/
if (rthal_defer_switch_p()) {
__ipipe_lock_root();
return 1;
}
if (rthal_current_domain == rthal_root_domain) {
rthal_trigger_irq(xnarch_escalation_virq);
__ipipe_unlock_root();
return 1;
}
__ipipe_unlock_root();
return 0;
}
#endif /* !_XENO_ASM_BLACKFIN_BITS_POD_H */
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