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 43struct mem_range_softc mem_range_softc; 44 45int 46memrw(struct cdev *dev, struct uio *uio, int flags) 47{ 48 ssize_t orig_resid; 49 vm_offset_t off, v; 50 struct iovec *iov; 51 struct vm_page m; 52 vm_page_t marr; 53 vm_prot_t prot; 54 u_int cnt; 55 int error; 56 57 error = 0; 58 orig_resid = uio->uio_resid; 59 while (uio->uio_resid > 0 && error == 0) { 60 iov = uio->uio_iov; 61 if (iov->iov_len == 0) { 62 uio->uio_iov++; 63 uio->uio_iovcnt--; 64 if (uio->uio_iovcnt < 0) 65 panic("memrw"); 66 continue; 67 } 68 69 v = uio->uio_offset; 70 off = v & PAGE_MASK; 71 cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off); 72 if (cnt == 0) 73 continue; 74 75 switch(dev2unit(dev)) { 76 case CDEV_MINOR_KMEM: 77 /* If the address is in the DMAP just copy it */ 78 if (VIRT_IN_DMAP(v)) { 79 error = uiomove((void *)v, cnt, uio); 80 break; 81 } 82 83 switch (uio->uio_rw) { 84 case UIO_READ: 85 prot = VM_PROT_READ; 86 break; 87 case UIO_WRITE: 88 prot = VM_PROT_WRITE; 89 break; 90 } 91 92 if (!kernacc((void *)v, cnt, prot)) { 93 error = EFAULT; 94 break; 95 } 96 97 /* Get the physical address to read */ 98 v = pmap_extract(kernel_pmap, v); 99 if (v == 0) { 100 error = EFAULT; 101 break; 102 } 103 104 /* FALLTHROUGH */ 105 case CDEV_MINOR_MEM: 106 /* If within the DMAP use this to copy from */ 107 if (PHYS_IN_DMAP(v)) { 108 v = PHYS_TO_DMAP(v); 109 error = uiomove((void *)v, cnt, uio); 110 break; 111 } 112 113 /* Have uiomove_fromphys handle the data */ 114 m.phys_addr = trunc_page(v); 115 marr = &m; 116 uiomove_fromphys(&marr, off, cnt, uio); 117 break; 118 } 119 } 120 121 /* 122 * Don't return error if any byte was written. Read and write 123 * can return error only if no i/o was performed. 124 */ 125 if (uio->uio_resid != orig_resid) 126 error = 0; 127 128 return (error); 129} 130 131/* 132 * Allow user processes to MMAP some memory sections 133 * instead of going through read/write. 134 */ 135int 136memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, 137 int prot __unused, vm_memattr_t *memattr __unused) 138{ 139 if (dev2unit(dev) == CDEV_MINOR_MEM) { 140 *paddr = offset; 141 return (0); 142 } 143 return (-1); 144} 145 146int 147memioctl_md(struct cdev *dev __unused, u_long cmd __unused, 148 caddr_t data __unused, int flags __unused, struct thread *td __unused) 149{ 150 return (ENOTTY); 151} 152