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1.1 nbrk 1: /* $NetBSD: mem.c,v 1.31 1996/05/03 19:42:19 christos Exp $ */
2: /* $OpenBSD: mem.c,v 1.32 2006/12/29 13:04:37 pedro Exp $ */
3: /*
4: * Copyright (c) 1988 University of Utah.
5: * Copyright (c) 1982, 1986, 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * the Systems Programming Group of the University of Utah Computer
10: * Science Department.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * @(#)mem.c 8.3 (Berkeley) 1/12/94
37: */
38:
39: /*
40: * Memory special file
41: */
42:
43: #include <sys/param.h>
44: #include <sys/buf.h>
45: #include <sys/systm.h>
46: #include <sys/uio.h>
47: #include <sys/ioccom.h>
48: #include <sys/malloc.h>
49: #include <sys/memrange.h>
50: #include <sys/proc.h>
51: #include <sys/fcntl.h>
52:
53: #include <machine/cpu.h>
54: #include <machine/conf.h>
55:
56: #include <uvm/uvm_extern.h>
57:
58: #include "mtrr.h"
59:
60: extern char *vmmap; /* poor name! */
61: caddr_t zeropage;
62:
63: /* open counter for aperture */
64: #ifdef APERTURE
65: static int ap_open_count = 0;
66: extern int allowaperture;
67:
68: #define VGA_START 0xA0000
69: #define BIOS_END 0xFFFFF
70: #endif
71:
72: #if NMTRR > 0
73: struct mem_range_softc mem_range_softc;
74: static int mem_ioctl(dev_t, u_long, caddr_t, int, struct proc *);
75: #endif
76:
77: /*ARGSUSED*/
78: int
79: mmopen(dev_t dev, int flag, int mode, struct proc *p)
80: {
81:
82: switch (minor(dev)) {
83: case 0:
84: case 1:
85: case 2:
86: case 12:
87: break;
88: #ifdef APERTURE
89: case 4:
90: if (suser(p, 0) != 0 || !allowaperture)
91: return (EPERM);
92:
93: /* authorize only one simultaneous open() */
94: if (ap_open_count > 0)
95: return(EPERM);
96: ap_open_count++;
97: break;
98: #endif
99: default:
100: return (ENXIO);
101: }
102: return (0);
103: }
104:
105: /*ARGSUSED*/
106: int
107: mmclose(dev_t dev, int flag, int mode, struct proc *p)
108: {
109: #ifdef APERTURE
110: if (minor(dev) == 4)
111: ap_open_count--;
112: #endif
113: return (0);
114: }
115:
116: /*ARGSUSED*/
117: int
118: mmrw(dev_t dev, struct uio *uio, int flags)
119: {
120: vaddr_t o, v;
121: int c;
122: struct iovec *iov;
123: int error = 0;
124: static int physlock;
125:
126: if (minor(dev) == 0) {
127: /* lock against other uses of shared vmmap */
128: while (physlock > 0) {
129: physlock++;
130: error = tsleep((caddr_t)&physlock, PZERO | PCATCH,
131: "mmrw", 0);
132: if (error)
133: return (error);
134: }
135: physlock = 1;
136: }
137: while (uio->uio_resid > 0 && error == 0) {
138: iov = uio->uio_iov;
139: if (iov->iov_len == 0) {
140: uio->uio_iov++;
141: uio->uio_iovcnt--;
142: if (uio->uio_iovcnt < 0)
143: panic("mmrw");
144: continue;
145: }
146: switch (minor(dev)) {
147:
148: /* minor device 0 is physical memory */
149: case 0:
150: v = uio->uio_offset;
151: pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
152: trunc_page(v), uio->uio_rw == UIO_READ ?
153: VM_PROT_READ : VM_PROT_WRITE, PMAP_WIRED);
154: pmap_update(pmap_kernel());
155: o = uio->uio_offset & PGOFSET;
156: c = min(uio->uio_resid, (int)(NBPG - o));
157: error = uiomove((caddr_t)vmmap + o, c, uio);
158: pmap_remove(pmap_kernel(), (vaddr_t)vmmap,
159: (vaddr_t)vmmap + NBPG);
160: pmap_update(pmap_kernel());
161: continue;
162:
163: /* minor device 1 is kernel memory */
164: case 1:
165: v = uio->uio_offset;
166: c = min(iov->iov_len, MAXPHYS);
167: if (!uvm_kernacc((caddr_t)v, c,
168: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
169: return (EFAULT);
170: error = uiomove((caddr_t)v, c, uio);
171: continue;
172:
173: /* minor device 2 is EOF/RATHOLE */
174: case 2:
175: if (uio->uio_rw == UIO_WRITE)
176: uio->uio_resid = 0;
177: return (0);
178:
179: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
180: case 12:
181: if (uio->uio_rw == UIO_WRITE) {
182: c = iov->iov_len;
183: break;
184: }
185: if (zeropage == NULL) {
186: zeropage = (caddr_t)
187: malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
188: bzero(zeropage, PAGE_SIZE);
189: }
190: c = min(iov->iov_len, PAGE_SIZE);
191: error = uiomove(zeropage, c, uio);
192: continue;
193:
194: default:
195: return (ENXIO);
196: }
197: (char *)iov->iov_base += c;
198: iov->iov_len -= c;
199: uio->uio_offset += c;
200: uio->uio_resid -= c;
201: }
202: if (minor(dev) == 0) {
203: if (physlock > 1)
204: wakeup((caddr_t)&physlock);
205: physlock = 0;
206: }
207: return (error);
208: }
209:
210: paddr_t
211: mmmmap(dev_t dev, off_t off, int prot)
212: {
213: struct proc *p = curproc; /* XXX */
214:
215: switch (minor(dev)) {
216: /* minor device 0 is physical memory */
217: case 0:
218: if ((u_int)off > ctob(physmem) &&
219: suser(p, 0) != 0)
220: return -1;
221: return atop(off);
222:
223: #ifdef APERTURE
224: /* minor device 4 is aperture driver */
225: case 4:
226: switch (allowaperture) {
227: case 1:
228: /* Allow mapping of the VGA framebuffer & BIOS only */
229: if ((off >= VGA_START && off <= BIOS_END) ||
230: (unsigned)off > (unsigned)ctob(physmem))
231: return atop(off);
232: else
233: return -1;
234: case 2:
235: /* Allow mapping of the whole 1st megabyte
236: for x86emu */
237: if (off <= BIOS_END ||
238: (unsigned)off > (unsigned)ctob(physmem))
239: return atop(off);
240: else
241: return -1;
242: default:
243: return -1;
244: }
245:
246: #endif
247: default:
248: return -1;
249: }
250: }
251:
252: int
253: mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
254: {
255: #if NMTRR > 0
256: switch (minor(dev)) {
257: case 0:
258: case 4:
259: return mem_ioctl(dev, cmd, data, flags, p);
260: }
261: #endif
262: return (ENODEV);
263: }
264:
265: #if NMTRR > 0
266: /*
267: * Operations for changing memory attributes.
268: *
269: * This is basically just an ioctl shim for mem_range_attr_get
270: * and mem_range_attr_set.
271: */
272: static int
273: mem_ioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
274: {
275: int nd, error = 0;
276: struct mem_range_op *mo = (struct mem_range_op *)data;
277: struct mem_range_desc *md;
278:
279: /* is this for us? */
280: if ((cmd != MEMRANGE_GET) &&
281: (cmd != MEMRANGE_SET))
282: return (ENOTTY);
283:
284: /* any chance we can handle this? */
285: if (mem_range_softc.mr_op == NULL)
286: return (EOPNOTSUPP);
287:
288: /* do we have any descriptors? */
289: if (mem_range_softc.mr_ndesc == 0)
290: return (ENXIO);
291:
292: switch (cmd) {
293: case MEMRANGE_GET:
294: nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
295: if (nd > 0) {
296: md = (struct mem_range_desc *)
297: malloc(nd * sizeof(struct mem_range_desc),
298: M_MEMDESC, M_WAITOK);
299: error = mem_range_attr_get(md, &nd);
300: if (!error)
301: error = copyout(md, mo->mo_desc,
302: nd * sizeof(struct mem_range_desc));
303: free(md, M_MEMDESC);
304: } else {
305: nd = mem_range_softc.mr_ndesc;
306: }
307: mo->mo_arg[0] = nd;
308: break;
309:
310: case MEMRANGE_SET:
311: md = malloc(sizeof(struct mem_range_desc), M_MEMDESC, M_WAITOK);
312: error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
313: /* clamp description string */
314: md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
315: if (error == 0)
316: error = mem_range_attr_set(md, &mo->mo_arg[0]);
317: free(md, M_MEMDESC);
318: break;
319: }
320: return (error);
321: }
322:
323: /*
324: * Implementation-neutral, kernel-callable functions for manipulating
325: * memory range attributes.
326: */
327: int
328: mem_range_attr_get(struct mem_range_desc *mrd, int *arg)
329: {
330: /* can we handle this? */
331: if (mem_range_softc.mr_op == NULL)
332: return (EOPNOTSUPP);
333:
334: if (*arg == 0) {
335: *arg = mem_range_softc.mr_ndesc;
336: } else {
337: bcopy(mem_range_softc.mr_desc, mrd, (*arg) * sizeof(struct mem_range_desc));
338: }
339: return (0);
340: }
341:
342: int
343: mem_range_attr_set(struct mem_range_desc *mrd, int *arg)
344: {
345: /* can we handle this? */
346: if (mem_range_softc.mr_op == NULL)
347: return (EOPNOTSUPP);
348:
349: return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg));
350: }
351:
352: #endif /* NMTRR > 0 */
353: