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/param.h> 29 #include <sys/systm.h> 30 #include <sys/conf.h> 31 #include <sys/malloc.h> 32 #include <sys/memrange.h> 33 #include <sys/uio.h> 34 35 #include <machine/memdev.h> 36 #include <machine/vmparam.h> 37 38 #include <vm/vm.h> 39 #include <vm/pmap.h> 40 #include <vm/vm_extern.h> 41 #include <vm/vm_page.h> 42 43 struct mem_range_softc mem_range_softc; 44 45 int 46 memrw(struct cdev *dev, struct uio *uio, int flags) 47 { 48 struct iovec *iov; 49 struct vm_page m; 50 vm_page_t marr; 51 vm_offset_t off, v; 52 u_int cnt; 53 int error; 54 55 error = 0; 56 57 while (uio->uio_resid > 0 && error == 0) { 58 iov = uio->uio_iov; 59 if (iov->iov_len == 0) { 60 uio->uio_iov++; 61 uio->uio_iovcnt--; 62 if (uio->uio_iovcnt < 0) 63 panic("memrw"); 64 continue; 65 } 66 67 v = uio->uio_offset; 68 off = v & PAGE_MASK; 69 cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off); 70 if (cnt == 0) 71 continue; 72 73 switch(dev2unit(dev)) { 74 case CDEV_MINOR_KMEM: 75 /* If the address is in the DMAP just copy it */ 76 if (VIRT_IN_DMAP(v)) { 77 error = uiomove((void *)v, cnt, uio); 78 break; 79 } 80 81 if (!kernacc((void *)v, cnt, uio->uio_rw == UIO_READ ? 82 VM_PROT_READ : VM_PROT_WRITE)) { 83 error = EFAULT; 84 break; 85 } 86 87 /* Get the physical address to read */ 88 v = pmap_extract(kernel_pmap, v); 89 if (v == 0) { 90 error = EFAULT; 91 break; 92 } 93 94 /* FALLTHROUGH */ 95 case CDEV_MINOR_MEM: 96 /* If within the DMAP use this to copy from */ 97 if (PHYS_IN_DMAP(v)) { 98 v = PHYS_TO_DMAP(v); 99 error = uiomove((void *)v, cnt, uio); 100 break; 101 } 102 103 /* Have uiomove_fromphys handle the data */ 104 m.phys_addr = trunc_page(v); 105 marr = &m; 106 uiomove_fromphys(&marr, off, cnt, uio); 107 break; 108 } 109 } 110 111 return (error); 112 } 113 114 /* 115 * allow user processes to MMAP some memory sections 116 * instead of going through read/write 117 */ 118 /* ARGSUSED */ 119 int 120 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 121 int prot __unused, vm_memattr_t *memattr __unused) 122 { 123 if (dev2unit(dev) == CDEV_MINOR_MEM) { 124 *paddr = offset; 125 return (0); 126 } 127 return (-1); 128 } 129 130 int 131 memioctl_md(struct cdev *dev __unused, u_long cmd __unused, 132 caddr_t data __unused, int flags __unused, struct thread *td __unused) 133 { 134 return (ENOTTY); 135 } 136