RTDECL(bool) RTThreadYield(void)
{
#if __FreeBSD_version >= 900032
    kern_yield(curthread->td_user_pri);
#else
    uio_yield();
#endif
    return false; /** @todo figure this one ... */
}
예제 #2
0
int
uiomoveco(void *cp, int n, struct uio *uio, int disposable)
{
	struct iovec *iov;
	u_int cnt;
	int error;

	KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
	    ("uiomoveco: mode"));
	KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
	    ("uiomoveco proc"));

	while (n > 0 && uio->uio_resid) {
		iov = uio->uio_iov;
		cnt = iov->iov_len;
		if (cnt == 0) {
			uio->uio_iov++;
			uio->uio_iovcnt--;
			continue;
		}
		if (cnt > n)
			cnt = n;

		switch (uio->uio_segflg) {

		case UIO_USERSPACE:
			if (ticks - PCPU_GET(switchticks) >= hogticks)
				uio_yield();

			error = userspaceco(cp, cnt, uio, disposable);

			if (error)
				return (error);
			break;

		case UIO_SYSSPACE:
			if (uio->uio_rw == UIO_READ)
				bcopy(cp, iov->iov_base, cnt);
			else
				bcopy(iov->iov_base, cp, cnt);
			break;
		case UIO_NOCOPY:
			break;
		}
		iov->iov_base = (char *)iov->iov_base + cnt;
		iov->iov_len -= cnt;
		uio->uio_resid -= cnt;
		uio->uio_offset += cnt;
		cp = (char *)cp + cnt;
		n -= cnt;
	}
	return (0);
}
예제 #3
0
/*
 * Implement uiomove(9) from physical memory using a combination
 * of the direct mapping and sf_bufs to reduce the creation and
 * destruction of ephemeral mappings.  
 */
int
uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
{
	struct sf_buf *sf;
	struct thread *td = curthread;
	struct iovec *iov;
	void *cp;
	vm_offset_t page_offset;
	vm_paddr_t pa;
	vm_page_t m;
	size_t cnt;
	int error = 0;
	int save = 0;

	KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
	    ("uiomove_fromphys: mode"));
	KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
	    ("uiomove_fromphys proc"));
	save = td->td_pflags & TDP_DEADLKTREAT;
	td->td_pflags |= TDP_DEADLKTREAT;
	while (n > 0 && uio->uio_resid) {
		iov = uio->uio_iov;
		cnt = iov->iov_len;
		if (cnt == 0) {
			uio->uio_iov++;
			uio->uio_iovcnt--;
			continue;
		}
		if (cnt > n)
			cnt = n;
		page_offset = offset & PAGE_MASK;
		cnt = ulmin(cnt, PAGE_SIZE - page_offset);
		m = ma[offset >> PAGE_SHIFT];
		pa = VM_PAGE_TO_PHYS(m);
		if (m->md.color != DCACHE_COLOR(pa)) {
			sf = sf_buf_alloc(m, 0);
			cp = (char *)sf_buf_kva(sf) + page_offset;
		} else {
			sf = NULL;
			cp = (char *)TLB_PHYS_TO_DIRECT(pa) + page_offset;
		}
		switch (uio->uio_segflg) {
		case UIO_USERSPACE:
			if (ticks - PCPU_GET(switchticks) >= hogticks)
				uio_yield();
			if (uio->uio_rw == UIO_READ)
				error = copyout(cp, iov->iov_base, cnt);
			else
				error = copyin(iov->iov_base, cp, cnt);
			if (error) {
				if (sf != NULL)
					sf_buf_free(sf);
				goto out;
			}
			break;
		case UIO_SYSSPACE:
			if (uio->uio_rw == UIO_READ)
				bcopy(cp, iov->iov_base, cnt);
			else
				bcopy(iov->iov_base, cp, cnt);
			break;
		case UIO_NOCOPY:
			break;
		}
		if (sf != NULL)
			sf_buf_free(sf);
		iov->iov_base = (char *)iov->iov_base + cnt;
		iov->iov_len -= cnt;
		uio->uio_resid -= cnt;
		uio->uio_offset += cnt;
		offset += cnt;
		n -= cnt;
	}
out:
	if (save == 0)
		td->td_pflags &= ~TDP_DEADLKTREAT;
	return (error);
}
예제 #4
0
static int
uiomove_faultflag(void *cp, int n, struct uio *uio, int nofault)
{
#ifndef __rtems__
	struct thread *td;
#endif /* __rtems__ */
	struct iovec *iov;
	u_int cnt;
	int error, newflags, save;

#ifndef __rtems__
	td = curthread;
#endif /* __rtems__ */
	error = 0;

	KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
	    ("uiomove: mode"));
	KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == td,
	    ("uiomove proc"));
	if (!nofault)
		WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
		    "Calling uiomove()");

#ifndef __rtems__
	/* XXX does it make a sense to set TDP_DEADLKTREAT for UIO_SYSSPACE ? */
	newflags = TDP_DEADLKTREAT;
	if (uio->uio_segflg == UIO_USERSPACE && nofault) {
		/*
		 * Fail if a non-spurious page fault occurs.
		 */
		newflags |= TDP_NOFAULTING | TDP_RESETSPUR;
	}
	save = curthread_pflags_set(newflags);
#else /* __rtems__ */
	(void) newflags;
	(void) save;
#endif /* __rtems__ */

	while (n > 0 && uio->uio_resid) {
		iov = uio->uio_iov;
		cnt = iov->iov_len;
		if (cnt == 0) {
			uio->uio_iov++;
			uio->uio_iovcnt--;
			continue;
		}
		if (cnt > n)
			cnt = n;

		switch (uio->uio_segflg) {

		case UIO_USERSPACE:
#ifndef __rtems__
			if (ticks - PCPU_GET(switchticks) >= hogticks)
				uio_yield();
#endif /* __rtems__ */
			if (uio->uio_rw == UIO_READ)
				error = copyout(cp, iov->iov_base, cnt);
			else
				error = copyin(iov->iov_base, cp, cnt);
			if (error)
				goto out;
			break;

		case UIO_SYSSPACE:
			if (uio->uio_rw == UIO_READ)
				bcopy(cp, iov->iov_base, cnt);
			else
				bcopy(iov->iov_base, cp, cnt);
			break;
		case UIO_NOCOPY:
			break;
		}
		iov->iov_base = (char *)iov->iov_base + cnt;
		iov->iov_len -= cnt;
		uio->uio_resid -= cnt;
		uio->uio_offset += cnt;
		cp = (char *)cp + cnt;
		n -= cnt;
	}
out:
#ifndef __rtems__
	curthread_pflags_restore(save);
#endif /* __rtems__ */
	return (error);
}
예제 #5
0
int
uiomove(void *cp, int n, struct uio *uio)
{
	struct thread *td = curthread;
	struct iovec *iov;
	u_int cnt;
	int error = 0;
	int save = 0;

	KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
	    ("uiomove: mode"));
	KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
	    ("uiomove proc"));
	WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
	    "Calling uiomove()");

#ifndef __rtems__
	save = td->td_pflags & TDP_DEADLKTREAT;
	td->td_pflags |= TDP_DEADLKTREAT;
#endif

	while (n > 0 && uio->uio_resid) {
		iov = uio->uio_iov;
		cnt = iov->iov_len;
		if (cnt == 0) {
			uio->uio_iov++;
			uio->uio_iovcnt--;
			continue;
		}
		if (cnt > n)
			cnt = n;

		switch (uio->uio_segflg) {

		case UIO_USERSPACE:
			if (ticks - PCPU_GET(switchticks) >= hogticks)
				uio_yield();
			if (uio->uio_rw == UIO_READ)
				error = copyout(cp, iov->iov_base, cnt);
			else
				error = copyin(iov->iov_base, cp, cnt);
			if (error)
				goto out;
			break;

		case UIO_SYSSPACE:
			if (uio->uio_rw == UIO_READ)
				bcopy(cp, iov->iov_base, cnt);
			else
				bcopy(iov->iov_base, cp, cnt);
			break;
		case UIO_NOCOPY:
			break;
		}
		iov->iov_base = (char *)iov->iov_base + cnt;
		iov->iov_len -= cnt;
		uio->uio_resid -= cnt;
		uio->uio_offset += cnt;
		cp = (char *)cp + cnt;
		n -= cnt;
	}
out:
#ifndef __rtems__
	if (save == 0)
		td->td_pflags &= ~TDP_DEADLKTREAT;
#endif
	return (error);
}