/*- * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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 * $FreeBSD$ */ /* * Memory special file */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static dev_t memdev, kmemdev, iodev; static d_open_t mmopen; static d_close_t mmclose; static d_read_t mmrw; static d_ioctl_t mmioctl; static d_mmap_t memmmap; #define CDEV_MAJOR 2 static struct cdevsw mem_cdevsw = { /* open */ mmopen, /* close */ mmclose, /* read */ mmrw, /* write */ mmrw, /* ioctl */ mmioctl, /* poll */ (d_poll_t *)seltrue, /* mmap */ memmmap, /* strategy */ nostrategy, /* name */ "mem", /* maj */ CDEV_MAJOR, /* dump */ nodump, /* psize */ nopsize, /* flags */ D_MEM, }; MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); struct mem_range_softc mem_range_softc; static int mmclose(dev_t dev, int flags, int fmt, struct thread *td) { switch (minor(dev)) { case 14: td->td_frame->tf_eflags &= ~PSL_IOPL; } return (0); } static int mmopen(dev_t dev, int flags, int fmt, struct thread *td) { int error; switch (minor(dev)) { case 0: case 1: if (flags & FWRITE) { error = securelevel_gt(td->td_ucred, 0); if (error != 0) return (error); } break; case 14: error = suser(td); if (error != 0) return (error); error = securelevel_gt(td->td_ucred, 0); if (error != 0) return (error); td->td_frame->tf_eflags |= PSL_IOPL; break; } return (0); } /*ARGSUSED*/ static int mmrw(dev_t dev, struct uio *uio, int flags) { int o; u_int c = 0, v; struct iovec *iov; int error = 0; vm_offset_t addr, eaddr; GIANT_REQUIRED; while (uio->uio_resid > 0 && error == 0) { iov = uio->uio_iov; if (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; if (uio->uio_iovcnt < 0) panic("mmrw"); continue; } switch (minor(dev)) { /* minor device 0 is physical memory */ case 0: v = uio->uio_offset; v &= ~PAGE_MASK; pmap_kenter((vm_offset_t)ptvmmap, v); o = (int)uio->uio_offset & PAGE_MASK; c = (u_int)(PAGE_SIZE - ((int)iov->iov_base & PAGE_MASK)); c = min(c, (u_int)(PAGE_SIZE - o)); c = min(c, (u_int)iov->iov_len); error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio); pmap_kremove((vm_offset_t)ptvmmap); continue; /* minor device 1 is kernel memory */ case 1: c = iov->iov_len; /* * Make sure that all of the pages are currently resident so * that we don't create any zero-fill pages. */ addr = trunc_page(uio->uio_offset); eaddr = round_page(uio->uio_offset + c); if (addr < (vm_offset_t)VADDR(PTDPTDI, 0)) return EFAULT; if (eaddr >= (vm_offset_t)VADDR(APTDPTDI, 0)) return EFAULT; for (; addr < eaddr; addr += PAGE_SIZE) if (pmap_extract(kernel_pmap, addr) == 0) { return EFAULT; } if (!kernacc((caddr_t)(int)uio->uio_offset, c, uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE)) { return (EFAULT); } error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio); continue; } if (error) break; iov->iov_base += c; iov->iov_len -= c; uio->uio_offset += c; uio->uio_resid -= c; } return (error); } /*******************************************************\ * allow user processes to MMAP some memory sections * * instead of going through read/write * \*******************************************************/ static int memmmap(dev_t dev, vm_offset_t offset, int prot) { switch (minor(dev)) { /* minor device 0 is physical memory */ case 0: return i386_btop(offset); /* minor device 1 is kernel memory */ case 1: return i386_btop(vtophys(offset)); default: return -1; } } /* * Operations for changing memory attributes. * * This is basically just an ioctl shim for mem_range_attr_get * and mem_range_attr_set. */ static int mmioctl(dev_t dev, 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); } /* * Implementation-neutral, kernel-callable functions for manipulating * memory range attributes. */ int mem_range_attr_get(struct mem_range_desc *mrd, int *arg) { /* can we handle this? */ if (mem_range_softc.mr_op == NULL) return (EOPNOTSUPP); if (*arg == 0) { *arg = mem_range_softc.mr_ndesc; } else { bcopy(mem_range_softc.mr_desc, mrd, (*arg) * sizeof(struct mem_range_desc)); } return (0); } int mem_range_attr_set(struct mem_range_desc *mrd, int *arg) { /* can we handle this? */ if (mem_range_softc.mr_op == NULL) return (EOPNOTSUPP); return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg)); } #ifdef SMP void mem_range_AP_init(void) { if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP) return (mem_range_softc.mr_op->initAP(&mem_range_softc)); } #endif static int mem_modevent(module_t mod, int type, void *data) { switch(type) { case MOD_LOAD: if (bootverbose) printf("mem: \n"); /* Initialise memory range handling */ if (mem_range_softc.mr_op != NULL) mem_range_softc.mr_op->init(&mem_range_softc); memdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_KMEM, 0640, "mem"); kmemdev = make_dev(&mem_cdevsw, 1, UID_ROOT, GID_KMEM, 0640, "kmem"); iodev = make_dev(&mem_cdevsw, 14, UID_ROOT, GID_WHEEL, 0600, "io"); return 0; case MOD_UNLOAD: destroy_dev(memdev); destroy_dev(kmemdev); destroy_dev(iodev); return 0; case MOD_SHUTDOWN: return 0; default: return EOPNOTSUPP; } } DEV_MODULE(mem, mem_modevent, NULL);