1 /* $NetBSD: ofrom.c,v 1.29 2021/01/27 03:10:21 thorpej Exp $ */ 2 3 /* 4 * Copyright 1998 5 * Digital Equipment Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and 8 * copied only in accordance with the following terms and conditions. 9 * Subject to these conditions, you may download, copy, install, 10 * use, modify and distribute this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce 14 * and retain this copyright notice and list of conditions as 15 * they appear in the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Digital Equipment Corporation. Neither the "Digital Equipment 19 * Corporation" name nor any trademark or logo of Digital Equipment 20 * Corporation may be used to endorse or promote products derived 21 * from this software without the prior written permission of 22 * Digital Equipment Corporation. 23 * 24 * 3) This software is provided "AS-IS" and any express or implied 25 * warranties, including but not limited to, any implied warranties 26 * of merchantability, fitness for a particular purpose, or 27 * non-infringement are disclaimed. In no event shall DIGITAL be 28 * liable for any damages whatsoever, and in particular, DIGITAL 29 * shall not be liable for special, indirect, consequential, or 30 * incidental damages or damages for lost profits, loss of 31 * revenue or loss of use, whether such damages arise in contract, 32 * negligence, tort, under statute, in equity, at law or otherwise, 33 * even if advised of the possibility of such damage. 34 */ 35 36 /* 37 * XXX open for writing (for user programs to mmap, and write contents) 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: ofrom.c,v 1.29 2021/01/27 03:10:21 thorpej Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/device.h> 45 #include <sys/systm.h> 46 #include <sys/conf.h> 47 #include <sys/fcntl.h> 48 #include <sys/bus.h> 49 50 #include <uvm/uvm_extern.h> 51 52 #include <dev/ofw/openfirm.h> 53 54 struct ofrom_softc { 55 int enabled; 56 paddr_t base; 57 paddr_t size; 58 }; 59 60 int ofromprobe(device_t, cfdata_t, void *); 61 void ofromattach(device_t, device_t, void *); 62 63 CFATTACH_DECL_NEW(ofrom, sizeof(struct ofrom_softc), 64 ofromprobe, ofromattach, NULL, NULL); 65 66 extern struct cfdriver ofrom_cd; 67 68 dev_type_open(ofromopen); 69 dev_type_read(ofromrw); 70 dev_type_mmap(ofrommmap); 71 72 const struct cdevsw ofrom_cdevsw = { 73 .d_open = ofromopen, 74 .d_close = nullclose, 75 .d_read = ofromrw, 76 .d_write = ofromrw, 77 .d_ioctl = noioctl, 78 .d_stop = nostop, 79 .d_tty = notty, 80 .d_poll = nopoll, 81 .d_mmap = ofrommmap, 82 .d_kqfilter = nokqfilter, 83 .d_discard = nodiscard, 84 .d_flag = 0 85 }; 86 87 static const struct device_compatible_entry compat_data[] = { 88 { .compat = "rom" }, 89 DEVICE_COMPAT_EOL 90 }; 91 92 int 93 ofromprobe(device_t parent, cfdata_t cf, void *aux) 94 { 95 struct ofbus_attach_args *oba = aux; 96 97 return of_compatible_match(oba->oba_phandle, compat_data) * 5; 98 } 99 100 101 void 102 ofromattach(device_t parent, device_t self, void *aux) 103 { 104 struct ofrom_softc *sc = device_private(self); 105 struct ofbus_attach_args *oba = aux; 106 char regbuf[8]; 107 108 if (OF_getproplen(oba->oba_phandle, "reg") != 8) { 109 printf(": invalid reg property\n"); 110 return; 111 } 112 if (OF_getprop(oba->oba_phandle, "reg", regbuf, sizeof regbuf) != 8) { 113 printf(": couldn't read reg property\n"); 114 return; 115 } 116 sc->base = of_decode_int(®buf[0]); 117 sc->size = of_decode_int(®buf[4]); 118 sc->enabled = 1; 119 120 printf(": %#lx-%#lx\n", sc->base, sc->base + sc->size - 1); 121 } 122 123 int 124 ofromopen(dev_t dev, int oflags, int devtype, struct lwp *l) 125 { 126 struct ofrom_softc *sc; 127 128 sc = device_lookup_private(&ofrom_cd, minor(dev)); 129 if (!sc || !sc->enabled) 130 return (ENXIO); 131 132 if (oflags & FWRITE) 133 return (EINVAL); 134 135 return (0); 136 } 137 138 int 139 ofromrw(dev_t dev, struct uio *uio, int flags) 140 { 141 pmap_t kpm = pmap_kernel(); 142 struct ofrom_softc *sc; 143 int c, error = 0; 144 struct iovec *iov; 145 paddr_t v; 146 psize_t o; 147 extern kmutex_t memlock; 148 extern char *memhook; 149 150 sc = device_lookup_private(&ofrom_cd, minor(dev)); 151 if (!sc || !sc->enabled) 152 return (ENXIO); /* XXX PANIC */ 153 154 mutex_enter(&memlock); 155 while (uio->uio_resid > 0 && error == 0) { 156 iov = uio->uio_iov; 157 if (iov->iov_len == 0) { 158 uio->uio_iov++; 159 uio->uio_iovcnt--; 160 if (uio->uio_iovcnt < 0) 161 panic("ofromrw"); 162 continue; 163 } 164 165 /* 166 * Since everything is page aligned and no more 167 * than the rest of a page is done at once, we 168 * can just check that the offset isn't too big. 169 */ 170 if (uio->uio_offset >= sc->size) 171 break; 172 173 v = sc->base + uio->uio_offset; 174 pmap_kenter_pa((vaddr_t)memhook, trunc_page(v), 175 uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE, 176 0); 177 pmap_update(kpm); 178 o = uio->uio_offset & PGOFSET; 179 c = uimin(uio->uio_resid, (int)(PAGE_SIZE - o)); 180 error = uiomove((char *)memhook + o, c, uio); 181 pmap_kremove((vaddr_t)memhook, (vaddr_t)memhook + PAGE_SIZE); 182 pmap_update(kpm); 183 } 184 mutex_exit(&memlock); 185 186 return (error); 187 } 188 189 paddr_t 190 ofrommmap(dev_t dev, off_t off, int prot) 191 { 192 struct ofrom_softc *sc; 193 194 sc = device_lookup_private(&ofrom_cd, minor(dev)); 195 if (!sc || !sc->enabled) 196 return (-1); /* XXX PANIC */ 197 198 if ((u_int)off >= sc->size) 199 return (-1); 200 201 return arm_btop(sc->base + off); 202 } 203
Indexes created Sun Oct 25 00:26:45 UTC 2026