Update to FreeBSD 9.2

1 files changed, 629 insertions, 0 deletions

diff --git a/freebsd/sys/kern/subr_uio.c b/freebsd/sys/kern/subr_uio.c
new file mode 100644
index 00000000..74f01ffa
--- /dev/null
+++ b/freebsd/sys/kern/subr_uio.c
@@ -0,0 +1,629 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 1982, 1986, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)kern_subr.c	8.3 (Berkeley) 1/21/94
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/local/opt_zero.h>
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <rtems/bsd/sys/lock.h>
+#include <sys/mman.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/resourcevar.h>
+#include <sys/sched.h>
+#include <sys/sysctl.h>
+#include <sys/vnode.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_page.h>
+#include <vm/vm_map.h>
+#ifdef ZERO_COPY_SOCKETS
+#include <vm/vm_object.h>
+#endif
+
+#ifndef __rtems__
+SYSCTL_INT(_kern, KERN_IOV_MAX, iov_max, CTLFLAG_RD, NULL, UIO_MAXIOV,
+	"Maximum number of elements in an I/O vector; sysconf(_SC_IOV_MAX)");
+#endif /* __rtems__ */
+
+static int uiomove_faultflag(void *cp, int n, struct uio *uio, int nofault);
+
+#ifndef __rtems__
+#ifdef ZERO_COPY_SOCKETS
+/* Declared in uipc_socket.c */
+extern int so_zero_copy_receive;
+
+/*
+ * Identify the physical page mapped at the given kernel virtual
+ * address.  Insert this physical page into the given address space at
+ * the given virtual address, replacing the physical page, if any,
+ * that already exists there.
+ */
+static int
+vm_pgmoveco(vm_map_t mapa, vm_offset_t kaddr, vm_offset_t uaddr)
+{
+	vm_map_t map = mapa;
+	vm_page_t kern_pg, user_pg;
+	vm_object_t uobject;
+	vm_map_entry_t entry;
+	vm_pindex_t upindex;
+	vm_prot_t prot;
+	boolean_t wired;
+
+	KASSERT((uaddr & PAGE_MASK) == 0,
+	    ("vm_pgmoveco: uaddr is not page aligned"));
+
+	/*
+	 * Herein the physical page is validated and dirtied.  It is
+	 * unwired in sf_buf_mext().
+	 */
+	kern_pg = PHYS_TO_VM_PAGE(vtophys(kaddr));
+	kern_pg->valid = VM_PAGE_BITS_ALL;
+	KASSERT(kern_pg->queue == PQ_NONE && kern_pg->wire_count == 1,
+	    ("vm_pgmoveco: kern_pg is not correctly wired"));
+
+	if ((vm_map_lookup(&map, uaddr,
+			   VM_PROT_WRITE, &entry, &uobject,
+			   &upindex, &prot, &wired)) != KERN_SUCCESS) {
+		return(EFAULT);
+	}
+	VM_OBJECT_LOCK(uobject);
+retry:
+	if ((user_pg = vm_page_lookup(uobject, upindex)) != NULL) {
+		if (vm_page_sleep_if_busy(user_pg, TRUE, "vm_pgmoveco"))
+			goto retry;
+		vm_page_lock(user_pg);
+		pmap_remove_all(user_pg);
+		vm_page_free(user_pg);
+		vm_page_unlock(user_pg);
+	} else {
+		/*
+		 * Even if a physical page does not exist in the
+		 * object chain's first object, a physical page from a
+		 * backing object may be mapped read only.
+		 */
+		if (uobject->backing_object != NULL)
+			pmap_remove(map->pmap, uaddr, uaddr + PAGE_SIZE);
+	}
+	vm_page_insert(kern_pg, uobject, upindex);
+	vm_page_dirty(kern_pg);
+	VM_OBJECT_UNLOCK(uobject);
+	vm_map_lookup_done(map, entry);
+	return(KERN_SUCCESS);
+}
+#endif /* ZERO_COPY_SOCKETS */
+
+int
+copyin_nofault(const void *udaddr, void *kaddr, size_t len)
+{
+	int error, save;
+
+	save = vm_fault_disable_pagefaults();
+	error = copyin(udaddr, kaddr, len);
+	vm_fault_enable_pagefaults(save);
+	return (error);
+}
+
+int
+copyout_nofault(const void *kaddr, void *udaddr, size_t len)
+{
+	int error, save;
+
+	save = vm_fault_disable_pagefaults();
+	error = copyout(kaddr, udaddr, len);
+	vm_fault_enable_pagefaults(save);
+	return (error);
+}
+
+#define	PHYS_PAGE_COUNT(len)	(howmany(len, PAGE_SIZE) + 1)
+
+int
+physcopyin(void *src, vm_paddr_t dst, size_t len)
+{
+	vm_page_t m[PHYS_PAGE_COUNT(len)];
+	struct iovec iov[1];
+	struct uio uio;
+	int i;
+
+	iov[0].iov_base = src;
+	iov[0].iov_len = len;
+	uio.uio_iov = iov;
+	uio.uio_iovcnt = 1;
+	uio.uio_offset = 0;
+	uio.uio_resid = len;
+	uio.uio_segflg = UIO_SYSSPACE;
+	uio.uio_rw = UIO_WRITE;
+	for (i = 0; i < PHYS_PAGE_COUNT(len); i++, dst += PAGE_SIZE)
+		m[i] = PHYS_TO_VM_PAGE(dst);
+	return (uiomove_fromphys(m, dst & PAGE_MASK, len, &uio));
+}
+
+int
+physcopyout(vm_paddr_t src, void *dst, size_t len)
+{
+	vm_page_t m[PHYS_PAGE_COUNT(len)];
+	struct iovec iov[1];
+	struct uio uio;
+	int i;
+
+	iov[0].iov_base = dst;
+	iov[0].iov_len = len;
+	uio.uio_iov = iov;
+	uio.uio_iovcnt = 1;
+	uio.uio_offset = 0;
+	uio.uio_resid = len;
+	uio.uio_segflg = UIO_SYSSPACE;
+	uio.uio_rw = UIO_READ;
+	for (i = 0; i < PHYS_PAGE_COUNT(len); i++, src += PAGE_SIZE)
+		m[i] = PHYS_TO_VM_PAGE(src);
+	return (uiomove_fromphys(m, src & PAGE_MASK, len, &uio));
+}
+
+#undef PHYS_PAGE_COUNT
+#endif /* __rtems__ */
+
+int
+uiomove(void *cp, int n, struct uio *uio)
+{
+
+	return (uiomove_faultflag(cp, n, uio, 0));
+}
+
+int
+uiomove_nofault(void *cp, int n, struct uio *uio)
+{
+
+	return (uiomove_faultflag(cp, n, uio, 1));
+}
+
+static int
+uiomove_faultflag(void *cp, int n, struct uio *uio, int nofault)
+{
+#ifndef __rtems__
+	struct thread *td;
+#endif /* __rtems__ */
+	struct iovec *iov;
+	size_t 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__
+			maybe_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);
+}
+
+#ifndef __rtems__
+/*
+ * Wrapper for uiomove() that validates the arguments against a known-good
+ * kernel buffer.  Currently, uiomove accepts a signed (n) argument, which
+ * is almost definitely a bad thing, so we catch that here as well.  We
+ * return a runtime failure, but it might be desirable to generate a runtime
+ * assertion failure instead.
+ */
+int
+uiomove_frombuf(void *buf, int buflen, struct uio *uio)
+{
+	size_t offset, n;
+
+	if (uio->uio_offset < 0 || uio->uio_resid < 0 ||
+	    (offset = uio->uio_offset) != uio->uio_offset)
+		return (EINVAL);
+	if (buflen <= 0 || offset >= buflen)
+		return (0);
+	if ((n = buflen - offset) > IOSIZE_MAX)
+		return (EINVAL);
+	return (uiomove((char *)buf + offset, n, uio));
+}
+
+#ifdef ZERO_COPY_SOCKETS
+/*
+ * Experimental support for zero-copy I/O
+ */
+static int
+userspaceco(void *cp, u_int cnt, struct uio *uio, int disposable)
+{
+	struct iovec *iov;
+	int error;
+
+	iov = uio->uio_iov;
+	if (uio->uio_rw == UIO_READ) {
+		if ((so_zero_copy_receive != 0)
+		 && ((cnt & PAGE_MASK) == 0)
+		 && ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
+		 && ((uio->uio_offset & PAGE_MASK) == 0)
+		 && ((((intptr_t) cp) & PAGE_MASK) == 0)
+		 && (disposable != 0)) {
+			/* SOCKET: use page-trading */
+			/*
+			 * We only want to call vm_pgmoveco() on
+			 * disposeable pages, since it gives the
+			 * kernel page to the userland process.
+			 */
+			error =	vm_pgmoveco(&curproc->p_vmspace->vm_map,
+			    (vm_offset_t)cp, (vm_offset_t)iov->iov_base);
+
+			/*
+			 * If we get an error back, attempt
+			 * to use copyout() instead.  The
+			 * disposable page should be freed
+			 * automatically if we weren't able to move
+			 * it into userland.
+			 */
+			if (error != 0)
+				error = copyout(cp, iov->iov_base, cnt);
+		} else {
+			error = copyout(cp, iov->iov_base, cnt);
+		}
+	} else {
+		error = copyin(iov->iov_base, cp, cnt);
+	}
+	return (error);
+}
+
+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:
+			maybe_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);
+}
+#endif /* ZERO_COPY_SOCKETS */
+
+/*
+ * Give next character to user as result of read.
+ */
+int
+ureadc(int c, struct uio *uio)
+{
+	struct iovec *iov;
+	char *iov_base;
+
+	WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
+	    "Calling ureadc()");
+
+again:
+	if (uio->uio_iovcnt == 0 || uio->uio_resid == 0)
+		panic("ureadc");
+	iov = uio->uio_iov;
+	if (iov->iov_len == 0) {
+		uio->uio_iovcnt--;
+		uio->uio_iov++;
+		goto again;
+	}
+	switch (uio->uio_segflg) {
+
+	case UIO_USERSPACE:
+		if (subyte(iov->iov_base, c) < 0)
+			return (EFAULT);
+		break;
+
+	case UIO_SYSSPACE:
+		iov_base = iov->iov_base;
+		*iov_base = c;
+		iov->iov_base = iov_base;
+		break;
+
+	case UIO_NOCOPY:
+		break;
+	}
+	iov->iov_base = (char *)iov->iov_base + 1;
+	iov->iov_len--;
+	uio->uio_resid--;
+	uio->uio_offset++;
+	return (0);
+}
+
+int
+copyinfrom(const void * __restrict src, void * __restrict dst, size_t len,
+    int seg)
+{
+	int error = 0;
+
+	switch (seg) {
+	case UIO_USERSPACE:
+		error = copyin(src, dst, len);
+		break;
+	case UIO_SYSSPACE:
+		bcopy(src, dst, len);
+		break;
+	default:
+		panic("copyinfrom: bad seg %d\n", seg);
+	}
+	return (error);
+}
+
+int
+copyinstrfrom(const void * __restrict src, void * __restrict dst, size_t len,
+    size_t * __restrict copied, int seg)
+{
+	int error = 0;
+
+	switch (seg) {
+	case UIO_USERSPACE:
+		error = copyinstr(src, dst, len, copied);
+		break;
+	case UIO_SYSSPACE:
+		error = copystr(src, dst, len, copied);
+		break;
+	default:
+		panic("copyinstrfrom: bad seg %d\n", seg);
+	}
+	return (error);
+}
+#endif /* __rtems__ */
+
+int
+copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, int error)
+{
+	u_int iovlen;
+
+	*iov = NULL;
+	if (iovcnt > UIO_MAXIOV)
+		return (error);
+	iovlen = iovcnt * sizeof (struct iovec);
+	*iov = malloc(iovlen, M_IOV, M_WAITOK);
+	error = copyin(iovp, *iov, iovlen);
+	if (error) {
+		free(*iov, M_IOV);
+		*iov = NULL;
+	}
+	return (error);
+}
+
+#ifndef __rtems__
+int
+copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop)
+{
+	struct iovec *iov;
+	struct uio *uio;
+	u_int iovlen;
+	int error, i;
+
+	*uiop = NULL;
+	if (iovcnt > UIO_MAXIOV)
+		return (EINVAL);
+	iovlen = iovcnt * sizeof (struct iovec);
+	uio = malloc(iovlen + sizeof *uio, M_IOV, M_WAITOK);
+	iov = (struct iovec *)(uio + 1);
+	error = copyin(iovp, iov, iovlen);
+	if (error) {
+		free(uio, M_IOV);
+		return (error);
+	}
+	uio->uio_iov = iov;
+	uio->uio_iovcnt = iovcnt;
+	uio->uio_segflg = UIO_USERSPACE;
+	uio->uio_offset = -1;
+	uio->uio_resid = 0;
+	for (i = 0; i < iovcnt; i++) {
+		if (iov->iov_len > IOSIZE_MAX - uio->uio_resid) {
+			free(uio, M_IOV);
+			return (EINVAL);
+		}
+		uio->uio_resid += iov->iov_len;
+		iov++;
+	}
+	*uiop = uio;
+	return (0);
+}
+
+struct uio *
+cloneuio(struct uio *uiop)
+{
+	struct uio *uio;
+	int iovlen;
+
+	iovlen = uiop->uio_iovcnt * sizeof (struct iovec);
+	uio = malloc(iovlen + sizeof *uio, M_IOV, M_WAITOK);
+	*uio = *uiop;
+	uio->uio_iov = (struct iovec *)(uio + 1);
+	bcopy(uiop->uio_iov, uio->uio_iov, iovlen);
+	return (uio);
+}
+
+/*
+ * Map some anonymous memory in user space of size sz, rounded up to the page
+ * boundary.
+ */
+int
+copyout_map(struct thread *td, vm_offset_t *addr, size_t sz)
+{
+	struct vmspace *vms;
+	int error;
+	vm_size_t size;
+
+	vms = td->td_proc->p_vmspace;
+
+	/*
+	 * Map somewhere after heap in process memory.
+	 */
+	PROC_LOCK(td->td_proc);
+	*addr = round_page((vm_offset_t)vms->vm_daddr +
+	    lim_max(td->td_proc, RLIMIT_DATA));
+	PROC_UNLOCK(td->td_proc);
+
+	/* round size up to page boundry */
+	size = (vm_size_t)round_page(sz);
+
+	error = vm_mmap(&vms->vm_map, addr, size, PROT_READ | PROT_WRITE,
+	    VM_PROT_ALL, MAP_PRIVATE | MAP_ANON, OBJT_DEFAULT, NULL, 0);
+
+	return (error);
+}
+
+/*
+ * Unmap memory in user space.
+ */
+int
+copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz)
+{
+	vm_map_t map;
+	vm_size_t size;
+
+	if (sz == 0)
+		return (0);
+
+	map = &td->td_proc->p_vmspace->vm_map;
+	size = (vm_size_t)round_page(sz);
+
+	if (vm_map_remove(map, addr, addr + size) != KERN_SUCCESS)
+		return (EINVAL);
+
+	return (0);
+}
+#endif /* __rtems__ */