/src/freebsd/sys/powerpc/powerpc/mem.c
C | 330 lines | 220 code | 43 blank | 67 comment | 52 complexity | 0cf09ae5ff5bfa7d95866432698d0b9e MD5 | raw file
Possible License(s): CC0-1.0, MIT, LGPL-2.0, LGPL-3.0, WTFPL, GPL-2.0, BSD-2-Clause, AGPL-3.0, CC-BY-SA-3.0, MPL-2.0, JSON, BSD-3-Clause-No-Nuclear-License-2014, LGPL-2.1, CPL-1.0, AGPL-1.0, 0BSD, ISC, Apache-2.0, GPL-3.0, IPL-1.0, MPL-2.0-no-copyleft-exception, BSD-3-Clause
- /*-
- * Copyright (c) 1988 University of Utah.
- * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * the Systems Programming Group of the University of Utah Computer
- * Science Department, and code derived from software contributed to
- * Berkeley by William Jolitz.
- *
- * 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.
- *
- * from: Utah $Hdr: mem.c 1.13 89/10/08$
- * from: @(#)mem.c 7.2 (Berkeley) 5/9/91
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- /*
- * Memory special file
- */
- #include <sys/param.h>
- #include <sys/conf.h>
- #include <sys/fcntl.h>
- #include <sys/kernel.h>
- #include <sys/lock.h>
- #include <sys/ioccom.h>
- #include <sys/malloc.h>
- #include <sys/memrange.h>
- #include <sys/module.h>
- #include <sys/mutex.h>
- #include <sys/proc.h>
- #include <sys/msgbuf.h>
- #include <sys/systm.h>
- #include <sys/signalvar.h>
- #include <sys/uio.h>
- #include <machine/md_var.h>
- #include <machine/vmparam.h>
- #include <vm/vm.h>
- #include <vm/pmap.h>
- #include <vm/vm_extern.h>
- #include <vm/vm_page.h>
- #include <machine/memdev.h>
- static void ppc_mrinit(struct mem_range_softc *);
- static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
- MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
- static struct mem_range_ops ppc_mem_range_ops = {
- ppc_mrinit,
- ppc_mrset,
- NULL,
- NULL
- };
- struct mem_range_softc mem_range_softc = {
- &ppc_mem_range_ops,
- 0, 0, NULL
- };
- /* ARGSUSED */
- int
- memrw(struct cdev *dev, struct uio *uio, int flags)
- {
- struct iovec *iov;
- int error = 0;
- vm_offset_t va, eva, off, v;
- vm_prot_t prot;
- struct vm_page m;
- vm_page_t marr;
- vm_size_t cnt;
- cnt = 0;
- error = 0;
- GIANT_REQUIRED;
- while (uio->uio_resid > 0 && !error) {
- iov = uio->uio_iov;
- if (iov->iov_len == 0) {
- uio->uio_iov++;
- uio->uio_iovcnt--;
- if (uio->uio_iovcnt < 0)
- panic("memrw");
- continue;
- }
- if (dev2unit(dev) == CDEV_MINOR_MEM) {
- kmem_direct_mapped: v = uio->uio_offset;
- off = uio->uio_offset & PAGE_MASK;
- cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
- PAGE_MASK);
- cnt = min(cnt, PAGE_SIZE - off);
- cnt = min(cnt, iov->iov_len);
- if (mem_valid(v, cnt)) {
- error = EFAULT;
- break;
- }
-
- if (!pmap_dev_direct_mapped(v, cnt)) {
- error = uiomove((void *)v, cnt, uio);
- } else {
- m.phys_addr = trunc_page(v);
- marr = &m;
- error = uiomove_fromphys(&marr, off, cnt, uio);
- }
- }
- else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
- va = uio->uio_offset;
- if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
- goto kmem_direct_mapped;
- va = trunc_page(uio->uio_offset);
- eva = round_page(uio->uio_offset
- + iov->iov_len);
- /*
- * Make sure that all the pages are currently resident
- * so that we don't create any zero-fill pages.
- */
- for (; va < eva; va += PAGE_SIZE)
- if (pmap_extract(kernel_pmap, va) == 0)
- return (EFAULT);
- prot = (uio->uio_rw == UIO_READ)
- ? VM_PROT_READ : VM_PROT_WRITE;
- va = uio->uio_offset;
- if (kernacc((void *) va, iov->iov_len, prot)
- == FALSE)
- return (EFAULT);
- error = uiomove((void *)va, iov->iov_len, uio);
- continue;
- }
- }
- return (error);
- }
- /*
- * allow user processes to MMAP some memory sections
- * instead of going through read/write
- */
- int
- memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
- int prot, vm_memattr_t *memattr)
- {
- int i;
- /*
- * /dev/mem is the only one that makes sense through this
- * interface. For /dev/kmem any physaddr we return here
- * could be transient and hence incorrect or invalid at
- * a later time.
- */
- if (dev2unit(dev) != CDEV_MINOR_MEM)
- return (-1);
- /* Only direct-mapped addresses. */
- if (mem_valid(offset, 0)
- && pmap_dev_direct_mapped(offset, 0))
- return (EFAULT);
- *paddr = offset;
- for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
- if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
- continue;
- if (offset >= mem_range_softc.mr_desc[i].mr_base &&
- offset < mem_range_softc.mr_desc[i].mr_base +
- mem_range_softc.mr_desc[i].mr_len) {
- switch (mem_range_softc.mr_desc[i].mr_flags &
- MDF_ATTRMASK) {
- case MDF_WRITEBACK:
- *memattr = VM_MEMATTR_WRITE_BACK;
- break;
- case MDF_WRITECOMBINE:
- *memattr = VM_MEMATTR_WRITE_COMBINING;
- break;
- case MDF_UNCACHEABLE:
- *memattr = VM_MEMATTR_UNCACHEABLE;
- break;
- case MDF_WRITETHROUGH:
- *memattr = VM_MEMATTR_WRITE_THROUGH;
- break;
- }
- break;
- }
- }
- return (0);
- }
- static void
- ppc_mrinit(struct mem_range_softc *sc)
- {
- sc->mr_cap = 0;
- sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
- sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
- M_MEMDESC, M_NOWAIT | M_ZERO);
- if (sc->mr_desc == NULL)
- panic("%s: malloc returns NULL", __func__);
- }
- static int
- ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
- {
- int i;
- switch(*arg) {
- case MEMRANGE_SET_UPDATE:
- for (i = 0; i < sc->mr_ndesc; i++) {
- if (!sc->mr_desc[i].mr_len) {
- sc->mr_desc[i] = *desc;
- sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
- return (0);
- }
- if (sc->mr_desc[i].mr_base == desc->mr_base &&
- sc->mr_desc[i].mr_len == desc->mr_len)
- return (EEXIST);
- }
- return (ENOSPC);
- case MEMRANGE_SET_REMOVE:
- for (i = 0; i < sc->mr_ndesc; i++)
- if (sc->mr_desc[i].mr_base == desc->mr_base &&
- sc->mr_desc[i].mr_len == desc->mr_len) {
- bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
- return (0);
- }
- return (ENOENT);
- default:
- return (EOPNOTSUPP);
- }
- return (0);
- }
- /*
- * Operations for changing memory attributes.
- *
- * This is basically just an ioctl shim for mem_range_attr_get
- * and mem_range_attr_set.
- */
- /* ARGSUSED */
- int
- memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
- struct thread *td)
- {
- int nd, error = 0;
- struct mem_range_op *mo = (struct mem_range_op *)data;
- struct mem_range_desc *md;
-
- /* is this for us? */
- if ((cmd != MEMRANGE_GET) &&
- (cmd != MEMRANGE_SET))
- return (ENOTTY);
- /* any chance we can handle this? */
- if (mem_range_softc.mr_op == NULL)
- return (EOPNOTSUPP);
- /* do we have any descriptors? */
- if (mem_range_softc.mr_ndesc == 0)
- return (ENXIO);
- switch (cmd) {
- case MEMRANGE_GET:
- nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
- if (nd > 0) {
- md = (struct mem_range_desc *)
- malloc(nd * sizeof(struct mem_range_desc),
- M_MEMDESC, M_WAITOK);
- error = mem_range_attr_get(md, &nd);
- if (!error)
- error = copyout(md, mo->mo_desc,
- nd * sizeof(struct mem_range_desc));
- free(md, M_MEMDESC);
- }
- else
- nd = mem_range_softc.mr_ndesc;
- mo->mo_arg[0] = nd;
- break;
-
- case MEMRANGE_SET:
- md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
- M_MEMDESC, M_WAITOK);
- error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
- /* clamp description string */
- md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
- if (error == 0)
- error = mem_range_attr_set(md, &mo->mo_arg[0]);
- free(md, M_MEMDESC);
- break;
- }
- return (error);
- }