Annotation of sys/arch/sh/sh/mem.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mem.c,v 1.2 2006/12/05 19:55:43 drahn Exp $ */
! 2: /* $NetBSD: mem.c,v 1.21 2006/07/23 22:06:07 ad Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 2002 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: * Copyright (c) 1982, 1986, 1990, 1993
! 8: * The Regents of the University of California. All rights reserved.
! 9: *
! 10: * This code is derived from software contributed to Berkeley by
! 11: * the Systems Programming Group of the University of Utah Computer
! 12: * Science Department.
! 13: *
! 14: * Redistribution and use in source and binary forms, with or without
! 15: * modification, are permitted provided that the following conditions
! 16: * are met:
! 17: * 1. Redistributions of source code must retain the above copyright
! 18: * notice, this list of conditions and the following disclaimer.
! 19: * 2. Redistributions in binary form must reproduce the above copyright
! 20: * notice, this list of conditions and the following disclaimer in the
! 21: * documentation and/or other materials provided with the distribution.
! 22: * 3. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: *
! 38: * @(#)mem.c 8.3 (Berkeley) 1/12/94
! 39: */
! 40:
! 41: /*
! 42: * Copyright (c) 1988 University of Utah.
! 43: *
! 44: * This code is derived from software contributed to Berkeley by
! 45: * the Systems Programming Group of the University of Utah Computer
! 46: * Science Department.
! 47: *
! 48: * Redistribution and use in source and binary forms, with or without
! 49: * modification, are permitted provided that the following conditions
! 50: * are met:
! 51: * 1. Redistributions of source code must retain the above copyright
! 52: * notice, this list of conditions and the following disclaimer.
! 53: * 2. Redistributions in binary form must reproduce the above copyright
! 54: * notice, this list of conditions and the following disclaimer in the
! 55: * documentation and/or other materials provided with the distribution.
! 56: * 3. All advertising materials mentioning features or use of this software
! 57: * must display the following acknowledgement:
! 58: * This product includes software developed by the University of
! 59: * California, Berkeley and its contributors.
! 60: * 4. Neither the name of the University nor the names of its contributors
! 61: * may be used to endorse or promote products derived from this software
! 62: * without specific prior written permission.
! 63: *
! 64: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 65: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 66: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 67: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 68: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 69: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 70: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 71: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 72: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 73: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 74: * SUCH DAMAGE.
! 75: *
! 76: * @(#)mem.c 8.3 (Berkeley) 1/12/94
! 77: */
! 78:
! 79: /*
! 80: * Memory special file
! 81: */
! 82:
! 83: #include <sys/param.h>
! 84: #include <sys/systm.h>
! 85: #include <sys/buf.h>
! 86: #include <sys/uio.h>
! 87: #include <sys/malloc.h>
! 88: #include <sys/proc.h>
! 89: #include <sys/conf.h>
! 90:
! 91: #include <uvm/uvm_extern.h>
! 92:
! 93: caddr_t zeropage;
! 94: boolean_t __mm_mem_addr(paddr_t);
! 95:
! 96: #define mmread mmrw
! 97: #define mmwrite mmrw
! 98: cdev_decl(mm);
! 99:
! 100: #define DEV_MEM 0
! 101: #define DEV_KMEM 1
! 102: #define DEV_NULL 2
! 103: #define DEV_ZERO 12
! 104:
! 105: /* ARGSUSED */
! 106: int
! 107: mmopen(dev_t dev, int flag, int mode, struct proc *p)
! 108: {
! 109: switch (minor(dev)) {
! 110: case DEV_MEM:
! 111: case DEV_KMEM:
! 112: case DEV_NULL:
! 113: case DEV_ZERO:
! 114: break;
! 115: default:
! 116: return (ENXIO);
! 117: }
! 118:
! 119: return (0);
! 120: }
! 121:
! 122: /*ARGSUSED*/
! 123: int
! 124: mmclose(dev_t dev, int flag, int mode, struct proc *p)
! 125: {
! 126: return (0);
! 127: }
! 128:
! 129: /*ARGSUSED*/
! 130: int
! 131: mmrw(dev_t dev, struct uio *uio, int flags)
! 132: {
! 133: struct iovec *iov;
! 134: vaddr_t v, o;
! 135: int c;
! 136: int error = 0;
! 137:
! 138: while (uio->uio_resid > 0 && !error) {
! 139: iov = uio->uio_iov;
! 140: if (iov->iov_len == 0) {
! 141: uio->uio_iov++;
! 142: uio->uio_iovcnt--;
! 143: if (uio->uio_iovcnt < 0)
! 144: panic("mmrw");
! 145: continue;
! 146: }
! 147:
! 148: v = uio->uio_offset;
! 149:
! 150: switch (minor(dev)) {
! 151: case DEV_MEM:
! 152: /* Physical address */
! 153: if (__mm_mem_addr(v)) {
! 154: o = v & PGOFSET;
! 155: c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
! 156: error = uiomove((caddr_t)SH3_PHYS_TO_P1SEG(v),
! 157: c, uio);
! 158: } else {
! 159: return (EFAULT);
! 160: }
! 161: break;
! 162:
! 163: case DEV_KMEM:
! 164: if (v < SH3_P1SEG_BASE) /* P0 */
! 165: return (EFAULT);
! 166: if (v < SH3_P2SEG_BASE) { /* P1 */
! 167: /* permitted */
! 168: /*
! 169: if (__mm_mem_addr(SH3_P1SEG_TO_PHYS(v))
! 170: == FALSE)
! 171: return (EFAULT);
! 172: */
! 173: c = min(iov->iov_len, MAXPHYS);
! 174: error = uiomove((caddr_t)v, c, uio);
! 175: } else if (v < SH3_P3SEG_BASE) /* P2 */
! 176: return (EFAULT);
! 177: else { /* P3 */
! 178: c = min(iov->iov_len, MAXPHYS);
! 179: if (!uvm_kernacc((void *)v, c,
! 180: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
! 181: return (EFAULT);
! 182: error = uiomove((caddr_t)v, c, uio);
! 183: }
! 184: break;
! 185:
! 186: case DEV_NULL:
! 187: if (uio->uio_rw == UIO_WRITE)
! 188: uio->uio_resid = 0;
! 189: return (0);
! 190:
! 191: case DEV_ZERO:
! 192: if (uio->uio_rw == UIO_WRITE) {
! 193: uio->uio_resid = 0;
! 194: return (0);
! 195: }
! 196: if (zeropage == NULL) {
! 197: zeropage = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
! 198: memset(zeropage, 0, PAGE_SIZE);
! 199: }
! 200: c = min(iov->iov_len, PAGE_SIZE);
! 201: error = uiomove(zeropage, c, uio);
! 202: break;
! 203:
! 204: default:
! 205: return (ENXIO);
! 206: }
! 207: }
! 208:
! 209: return (error);
! 210: }
! 211:
! 212: /*ARGSUSED*/
! 213: paddr_t
! 214: mmmmap(dev_t dev, off_t off, int prot)
! 215: {
! 216: struct proc *p = curproc;
! 217:
! 218: if (minor(dev) != DEV_MEM)
! 219: return (-1);
! 220:
! 221: if (__mm_mem_addr((paddr_t)off) == FALSE && suser(p, 0) != 0)
! 222: return (-1);
! 223: return (atop((paddr_t)off));
! 224: }
! 225:
! 226: /*ARGSUSED*/
! 227: int
! 228: mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
! 229: {
! 230: return (EOPNOTSUPP);
! 231: }
! 232:
! 233: /*
! 234: * boolean_t __mm_mem_addr(paddr_t pa):
! 235: * Check specified physical address is in physical memory, with the
! 236: * kernel image off-limits.
! 237: */
! 238: boolean_t
! 239: __mm_mem_addr(paddr_t pa)
! 240: {
! 241: #if 0
! 242: extern vaddr_t kernend; /* from machdep.c */
! 243: #endif
! 244: struct vm_physseg *seg;
! 245: unsigned int segno;
! 246:
! 247: for (segno = 0, seg = vm_physmem; segno < vm_nphysseg; segno++, seg++) {
! 248: if (pa < seg->start || pa >= seg->end)
! 249: continue;
! 250:
! 251: #if 0
! 252: /*
! 253: * This assumes the kernel image occupies the beginning of a
! 254: * memory segment.
! 255: */
! 256: if (kernend >= seg->start && kernend < seg->end) {
! 257: if (pa < kernend)
! 258: return (FALSE);
! 259: }
! 260: #endif
! 261:
! 262: return (TRUE);
! 263: }
! 264:
! 265: return (FALSE);
! 266: }
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