/usr/include/xenomai/asm-sh/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) 2011 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_SH_BITS_POD_H
#define _XENO_ASM_SH_BITS_POD_H
#include <asm-generic/xenomai/bits/pod.h>
#include <asm/xenomai/switch.h>
void xnpod_welcome_thread(struct xnthread *, int);
void xnpod_delete_thread(struct xnthread *);
extern int xnarch_escalation_virq;
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);
}
static inline void xnarch_stop_timer(int cpu)
{
rthal_timer_release(cpu);
}
static inline void xnarch_leave_root(xnarchtcb_t * rootcb)
{
struct task_struct *p = current;
rootcb->user_task = rootcb->active_task = p;
rootcb->tsp = &p->thread;
rootcb->mm = rootcb->active_mm = rthal_get_active_mm();
#ifdef CONFIG_XENO_HW_FPU
rootcb->user_fpu_owner = rthal_get_fpu_owner(p);
rootcb->fpup = rootcb->user_fpu_owner ?
&rootcb->user_fpu_owner->thread : NULL;
#endif /* CONFIG_XENO_HW_FPU */
}
static inline void xnarch_enter_root(xnarchtcb_t * rootcb)
{
}
static inline void xnarch_switch_to(xnarchtcb_t *out_tcb,
xnarchtcb_t *in_tcb)
{
struct mm_struct *prev_mm = out_tcb->active_mm, *next_mm;
struct task_struct *prev = out_tcb->active_task;
struct task_struct *next = in_tcb->user_task;
if (likely(next != NULL)) {
in_tcb->active_task = next;
in_tcb->active_mm = in_tcb->mm;
rthal_clear_foreign_stack(&rthal_domain);
} else {
in_tcb->active_task = prev;
in_tcb->active_mm = prev_mm;
rthal_set_foreign_stack(&rthal_domain);
}
next_mm = in_tcb->active_mm;
if (next_mm && likely(prev_mm != next_mm))
wrap_switch_mm(prev_mm, next_mm, next);
xnarch_switch_threads(out_tcb, in_tcb, prev, next);
}
asmlinkage void xnarch_thread_trampoline(struct xnarchtcb *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 *sp, sr, gbr;
/*
* Stack space is guaranteed to have been fully zeroed. We do
* this earlier in xnthread_init() which runs with interrupts
* on, to reduce latency.
*/
sp = (void *)tcb->stackbase + tcb->stacksize;
*--sp = (unsigned long)tcb;
sr = SR_MD;
#ifdef CONFIG_SH_FPU
sr |= SR_FD; /* Disable FPU */
#endif
*--sp = (unsigned long)sr;
__asm__ __volatile__ ("stc gbr, %0" : "=r" (gbr));
*--sp = (unsigned long)gbr;
tcb->ts.sp = (unsigned long)sp;
tcb->ts.pc = (unsigned long)rthal_thread_trampoline;
tcb->entry = entry;
tcb->cookie = cookie;
tcb->self = thread;
tcb->imask = imask;
tcb->name = name;
}
/* No lazy FPU init on SH. */
#define xnarch_fpu_init_p(task) (1)
#ifdef CONFIG_XENO_HW_FPU
static void xnarch_init_fpu(xnarchtcb_t * tcb)
{
/*
* Initialize the FPU for an emerging kernel-based RT
* thread. This must be run on behalf of the emerging thread.
* xnarch_init_tcb() guarantees that all FPU regs are zeroed
* in tcb.
*/
rthal_init_fpu(&tcb->ts);
}
static inline void xnarch_enable_fpu(xnarchtcb_t *tcb)
{
struct task_struct *task = tcb->user_task;
if (task && task != tcb->user_fpu_owner)
rthal_disable_fpu();
else
rthal_enable_fpu();
}
static void xnarch_save_fpu(xnarchtcb_t *tcb)
{
struct pt_regs *regs;
if (tcb->fpup) {
rthal_save_fpu(tcb->fpup);
if (tcb->user_fpu_owner) {
regs = task_pt_regs(tcb->user_fpu_owner);
regs->sr |= SR_FD;
}
}
}
static void xnarch_restore_fpu(xnarchtcb_t * tcb)
{
struct pt_regs *regs;
if (tcb->fpup) {
rthal_restore_fpu(tcb->fpup);
/*
* Note: Only enable FPU in SR, if it was enabled when
* we saved the fpu state.
*/
if (tcb->user_fpu_owner) {
regs = task_pt_regs(tcb->user_fpu_owner);
regs->sr &= ~SR_FD;
}
}
if (tcb->user_task && tcb->user_task != tcb->user_fpu_owner)
rthal_disable_fpu();
}
#endif /* CONFIG_XENO_HW_FPU */
static inline int xnarch_escalate(void)
{
extern int xnarch_escalation_virq;
if (rthal_current_domain == rthal_root_domain) {
rthal_trigger_irq(xnarch_escalation_virq);
return 1;
}
return 0;
}
#endif /* !_XENO_ASM_SH_BITS_POD_H */
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