1 /*- 2 * Copyright (c) 2014 Andrew Turner 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/conf.h> 34 #include <sys/malloc.h> 35 #include <sys/memrange.h> 36 #include <sys/uio.h> 37 38 #include <machine/memdev.h> 39 #include <machine/vmparam.h> 40 41 #include <vm/vm.h> 42 #include <vm/pmap.h> 43 #include <vm/vm_extern.h> 44 #include <vm/vm_page.h> 45 46 struct mem_range_softc mem_range_softc; 47 48 int 49 memrw(struct cdev *dev, struct uio *uio, int flags) 50 { 51 struct iovec *iov; 52 struct vm_page m; 53 vm_page_t marr; 54 vm_offset_t off, v; 55 u_int cnt; 56 int error; 57 58 error = 0; 59 60 while (uio->uio_resid > 0 && error == 0) { 61 iov = uio->uio_iov; 62 if (iov->iov_len == 0) { 63 uio->uio_iov++; 64 uio->uio_iovcnt--; 65 if (uio->uio_iovcnt < 0) 66 panic("memrw"); 67 continue; 68 } 69 70 v = uio->uio_offset; 71 off = v & PAGE_MASK; 72 cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off); 73 if (cnt == 0) 74 continue; 75 76 switch(dev2unit(dev)) { 77 case CDEV_MINOR_KMEM: 78 /* If the address is in the DMAP just copy it */ 79 if (VIRT_IN_DMAP(v)) { 80 error = uiomove((void *)v, cnt, uio); 81 break; 82 } 83 84 if (!kernacc((void *)v, cnt, uio->uio_rw == UIO_READ ? 85 VM_PROT_READ : VM_PROT_WRITE)) { 86 error = EFAULT; 87 break; 88 } 89 90 /* Get the physical address to read */ 91 v = pmap_extract(kernel_pmap, v); 92 if (v == 0) { 93 error = EFAULT; 94 break; 95 } 96 97 /* FALLTHROUGH */ 98 case CDEV_MINOR_MEM: 99 /* If within the DMAP use this to copy from */ 100 if (PHYS_IN_DMAP(v)) { 101 v = PHYS_TO_DMAP(v); 102 error = uiomove((void *)v, cnt, uio); 103 break; 104 } 105 106 /* Have uiomove_fromphys handle the data */ 107 m.phys_addr = trunc_page(v); 108 marr = &m; 109 uiomove_fromphys(&marr, off, cnt, uio); 110 break; 111 } 112 } 113 114 return (error); 115 } 116 117 /* 118 * allow user processes to MMAP some memory sections 119 * instead of going through read/write 120 */ 121 /* ARGSUSED */ 122 int 123 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 124 int prot __unused, vm_memattr_t *memattr __unused) 125 { 126 if (dev2unit(dev) == CDEV_MINOR_MEM) { 127 *paddr = offset; 128 return (0); 129 } 130 return (-1); 131 } 132 133 int 134 memioctl_md(struct cdev *dev __unused, u_long cmd __unused, 135 caddr_t data __unused, int flags __unused, struct thread *td __unused) 136 { 137 return (ENOTTY); 138 } 139