![[BACK]](/icons/back.gif){kind=icon}
Return to i686_mem.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / i386 / i386|
Return to i686_mem.c CVS log | Up to [local] / sys / arch / i386 / i386 |
1.1 nbrk 1: /* $OpenBSD: i686_mem.c,v 1.9 2006/09/19 11:06:33 jsg Exp $ */
2: /*-
3: * Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: *
27: * $FreeBSD: src/sys/i386/i386/i686_mem.c,v 1.8 1999/10/12 22:53:05 green Exp $
28: */
29:
30: #include <sys/param.h>
31: #include <sys/kernel.h>
32: #include <sys/systm.h>
33: #include <sys/malloc.h>
34: #include <sys/memrange.h>
35:
36: #include <machine/cpufunc.h>
37: #include <machine/specialreg.h>
38:
39: /*
40: * i686 memory range operations
41: *
42: * This code will probably be impenetrable without reference to the
43: * Intel Pentium Pro documentation.
44: */
45:
46: char *mem_owner_bios = "BIOS";
47:
48: #define MR686_FIXMTRR (1<<0)
49:
50: #define mrwithin(mr, a) \
51: (((a) >= (mr)->mr_base) && ((a) < ((mr)->mr_base + (mr)->mr_len)))
52: #define mroverlap(mra, mrb) \
53: (mrwithin(mra, mrb->mr_base) || mrwithin(mrb, mra->mr_base))
54:
55: #define mrvalid(base, len) \
56: ((!(base & ((1 << 12) - 1))) && /* base is multiple of 4k */ \
57: ((len) >= (1 << 12)) && /* length is >= 4k */ \
58: powerof2((len)) && /* ... and power of two */ \
59: !((base) & ((len) - 1))) /* range is not discontiuous */
60:
61: #define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK))
62:
63: void i686_mrinit(struct mem_range_softc *sc);
64: int i686_mrset(struct mem_range_softc *sc,
65: struct mem_range_desc *mrd,
66: int *arg);
67: void i686_mrAPinit(struct mem_range_softc *sc);
68:
69: struct mem_range_ops i686_mrops = {
70: i686_mrinit,
71: i686_mrset,
72: i686_mrAPinit
73: };
74:
75: /* XXX for AP startup hook */
76: u_int64_t mtrrcap, mtrrdef;
77:
78: struct mem_range_desc *mem_range_match(struct mem_range_softc *sc,
79: struct mem_range_desc *mrd);
80: void i686_mrfetch(struct mem_range_softc *sc);
81: int i686_mtrrtype(int flags);
82: int i686_mrt2mtrr(int flags, int oldval);
83: int i686_mtrr2mrt(int val);
84: int i686_mtrrconflict(int flag1, int flag2);
85: void i686_mrstore(struct mem_range_softc *sc);
86: void i686_mrstoreone(void *arg);
87: struct mem_range_desc *i686_mtrrfixsearch(struct mem_range_softc *sc,
88: u_int64_t addr);
89: int i686_mrsetlow(struct mem_range_softc *sc,
90: struct mem_range_desc *mrd,
91: int *arg);
92: int i686_mrsetvariable(struct mem_range_softc *sc,
93: struct mem_range_desc *mrd,
94: int *arg);
95:
96: /* i686 MTRR type to memory range type conversion */
97: int i686_mtrrtomrt[] = {
98: MDF_UNCACHEABLE,
99: MDF_WRITECOMBINE,
100: MDF_UNKNOWN,
101: MDF_UNKNOWN,
102: MDF_WRITETHROUGH,
103: MDF_WRITEPROTECT,
104: MDF_WRITEBACK
105: };
106:
107: #define MTRRTOMRTLEN (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0]))
108:
109: int
110: i686_mtrr2mrt(int val)
111: {
112: if (val < 0 || val >= MTRRTOMRTLEN)
113: return MDF_UNKNOWN;
114: return i686_mtrrtomrt[val];
115: }
116:
117: /*
118: * i686 MTRR conflicts. Writeback and uncachable may overlap.
119: */
120: int
121: i686_mtrrconflict(int flag1, int flag2)
122: {
123:
124: flag1 &= MDF_ATTRMASK;
125: flag2 &= MDF_ATTRMASK;
126: if (flag1 == flag2 ||
127: (flag1 == MDF_WRITEBACK && flag2 == MDF_UNCACHEABLE) ||
128: (flag2 == MDF_WRITEBACK && flag1 == MDF_UNCACHEABLE))
129: return 0;
130: return 1;
131: }
132:
133: /*
134: * Look for an exactly-matching range.
135: */
136: struct mem_range_desc *
137: mem_range_match(struct mem_range_softc *sc, struct mem_range_desc *mrd)
138: {
139: struct mem_range_desc *cand;
140: int i;
141:
142: for (i = 0, cand = sc->mr_desc; i < sc->mr_ndesc; i++, cand++)
143: if ((cand->mr_base == mrd->mr_base) &&
144: (cand->mr_len == mrd->mr_len))
145: return(cand);
146: return(NULL);
147: }
148:
149: /*
150: * Fetch the current mtrr settings from the current CPU (assumed to all
151: * be in sync in the SMP case). Note that if we are here, we assume
152: * that MTRRs are enabled, and we may or may not have fixed MTRRs.
153: */
154: void
155: i686_mrfetch(struct mem_range_softc *sc)
156: {
157: struct mem_range_desc *mrd;
158: u_int64_t msrv;
159: int i, j, msr;
160:
161: mrd = sc->mr_desc;
162:
163: /* Get fixed-range MTRRs */
164: if (sc->mr_cap & MR686_FIXMTRR) {
165: msr = MSR_MTRR64kBase;
166: for (i = 0; i < (MTRR_N64K / 8); i++, msr++) {
167: msrv = rdmsr(msr);
168: for (j = 0; j < 8; j++, mrd++) {
169: mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
170: i686_mtrr2mrt(msrv & 0xff) |
171: MDF_ACTIVE;
172: if (mrd->mr_owner[0] == 0)
173: strlcpy(mrd->mr_owner, mem_owner_bios,
174: sizeof(mrd->mr_owner));
175: msrv = msrv >> 8;
176: }
177: }
178: msr = MSR_MTRR16kBase;
179: for (i = 0; i < (MTRR_N16K / 8); i++, msr++) {
180: msrv = rdmsr(msr);
181: for (j = 0; j < 8; j++, mrd++) {
182: mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
183: i686_mtrr2mrt(msrv & 0xff) |
184: MDF_ACTIVE;
185: if (mrd->mr_owner[0] == 0)
186: strlcpy(mrd->mr_owner, mem_owner_bios,
187: sizeof(mrd->mr_owner));
188: msrv = msrv >> 8;
189: }
190: }
191: msr = MSR_MTRR4kBase;
192: for (i = 0; i < (MTRR_N4K / 8); i++, msr++) {
193: msrv = rdmsr(msr);
194: for (j = 0; j < 8; j++, mrd++) {
195: mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
196: i686_mtrr2mrt(msrv & 0xff) |
197: MDF_ACTIVE;
198: if (mrd->mr_owner[0] == 0)
199: strlcpy(mrd->mr_owner, mem_owner_bios,
200: sizeof(mrd->mr_owner));
201: msrv = msrv >> 8;
202: }
203: }
204: }
205:
206: /* Get remainder which must be variable MTRRs */
207: msr = MSR_MTRRVarBase;
208: for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) {
209: msrv = rdmsr(msr);
210: mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
211: i686_mtrr2mrt(msrv & 0xff);
212: mrd->mr_base = msrv & 0x0000000ffffff000LL;
213: msrv = rdmsr(msr + 1);
214: mrd->mr_flags = (msrv & 0x800) ?
215: (mrd->mr_flags | MDF_ACTIVE) :
216: (mrd->mr_flags & ~MDF_ACTIVE);
217: /* Compute the range from the mask. Ick. */
218: mrd->mr_len = (~(msrv & 0x0000000ffffff000LL) & 0x0000000fffffffffLL) + 1;
219: if (!mrvalid(mrd->mr_base, mrd->mr_len))
220: mrd->mr_flags |= MDF_BOGUS;
221: /* If unclaimed and active, must be the BIOS */
222: if ((mrd->mr_flags & MDF_ACTIVE) && (mrd->mr_owner[0] == 0))
223: strlcpy(mrd->mr_owner, mem_owner_bios,
224: sizeof(mrd->mr_owner));
225: }
226: }
227:
228: /*
229: * Return the MTRR memory type matching a region's flags
230: */
231: int
232: i686_mtrrtype(int flags)
233: {
234: int i;
235:
236: flags &= MDF_ATTRMASK;
237:
238: for (i = 0; i < MTRRTOMRTLEN; i++) {
239: if (i686_mtrrtomrt[i] == MDF_UNKNOWN)
240: continue;
241: if (flags == i686_mtrrtomrt[i])
242: return(i);
243: }
244: return(-1);
245: }
246:
247: int
248: i686_mrt2mtrr(int flags, int oldval)
249: {
250: int val;
251:
252: if ((val = i686_mtrrtype(flags)) == -1)
253: return oldval & 0xff;
254: return val & 0xff;
255: }
256:
257: /*
258: * Update running CPU(s) MTRRs to match the ranges in the descriptor
259: * list.
260: *
261: * XXX Must be called with interrupts enabled.
262: */
263: void
264: i686_mrstore(struct mem_range_softc *sc)
265: {
266: disable_intr(); /* disable interrupts */
267: i686_mrstoreone((void *)sc);
268: enable_intr();
269: }
270:
271: /*
272: * Update the current CPU's MTRRs with those represented in the
273: * descriptor list. Note that we do this wholesale rather than
274: * just stuffing one entry; this is simpler (but slower, of course).
275: */
276: void
277: i686_mrstoreone(void *arg)
278: {
279: struct mem_range_softc *sc = (struct mem_range_softc *)arg;
280: struct mem_range_desc *mrd;
281: u_int64_t omsrv, msrv;
282: int i, j, msr;
283: u_int cr4save;
284:
285: mrd = sc->mr_desc;
286:
287: cr4save = rcr4(); /* save cr4 */
288: if (cr4save & CR4_PGE)
289: lcr4(cr4save & ~CR4_PGE);
290: lcr0((rcr0() & ~CR0_NW) | CR0_CD); /* disable caches (CD = 1, NW = 0) */
291: wbinvd(); /* flush caches, TLBs */
292: wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) & ~0x800); /* disable MTRRs (E = 0) */
293:
294: /* Set fixed-range MTRRs */
295: if (sc->mr_cap & MR686_FIXMTRR) {
296: msr = MSR_MTRR64kBase;
297: for (i = 0; i < (MTRR_N64K / 8); i++, msr++) {
298: msrv = 0;
299: omsrv = rdmsr(msr);
300: for (j = 7; j >= 0; j--) {
301: msrv = msrv << 8;
302: msrv |= i686_mrt2mtrr((mrd + j)->mr_flags,
303: omsrv >> (j*8));
304: }
305: wrmsr(msr, msrv);
306: mrd += 8;
307: }
308: msr = MSR_MTRR16kBase;
309: for (i = 0; i < (MTRR_N16K / 8); i++, msr++) {
310: msrv = 0;
311: omsrv = rdmsr(msr);
312: for (j = 7; j >= 0; j--) {
313: msrv = msrv << 8;
314: msrv |= i686_mrt2mtrr((mrd + j)->mr_flags,
315: omsrv >> (j*8));
316: }
317: wrmsr(msr, msrv);
318: mrd += 8;
319: }
320: msr = MSR_MTRR4kBase;
321: for (i = 0; i < (MTRR_N4K / 8); i++, msr++) {
322: msrv = 0;
323: omsrv = rdmsr(msr);
324: for (j = 7; j >= 0; j--) {
325: msrv = msrv << 8;
326: msrv |= i686_mrt2mtrr((mrd + j)->mr_flags,
327: omsrv >> (j*8));
328: }
329: wrmsr(msr, msrv);
330: mrd += 8;
331: }
332: }
333:
334: /* Set remainder which must be variable MTRRs */
335: msr = MSR_MTRRVarBase;
336: for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) {
337: /* base/type register */
338: omsrv = rdmsr(msr);
339: if (mrd->mr_flags & MDF_ACTIVE) {
340: msrv = mrd->mr_base & 0x0000000ffffff000LL;
341: msrv |= i686_mrt2mtrr(mrd->mr_flags, omsrv);
342: } else {
343: msrv = 0;
344: }
345: wrmsr(msr, msrv);
346:
347: /* mask/active register */
348: if (mrd->mr_flags & MDF_ACTIVE) {
349: msrv = 0x800 | (~(mrd->mr_len - 1) & 0x0000000ffffff000LL);
350: } else {
351: msrv = 0;
352: }
353: wrmsr(msr + 1, msrv);
354: }
355: wbinvd(); /* flush caches, TLBs */
356: wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) | 0x800); /* restore MTRR state */
357: lcr0(rcr0() & ~(CR0_CD | CR0_NW)); /* enable caches CD = 0 and NW = 0 */
358: lcr4(cr4save); /* restore cr4 */
359: }
360:
361: /*
362: * Hunt for the fixed MTRR referencing (addr)
363: */
364: struct mem_range_desc *
365: i686_mtrrfixsearch(struct mem_range_softc *sc, u_int64_t addr)
366: {
367: struct mem_range_desc *mrd;
368: int i;
369:
370: for (i = 0, mrd = sc->mr_desc; i < (MTRR_N64K + MTRR_N16K + MTRR_N4K); i++, mrd++)
371: if ((addr >= mrd->mr_base) && (addr < (mrd->mr_base + mrd->mr_len)))
372: return(mrd);
373: return(NULL);
374: }
375:
376: /*
377: * Try to satisfy the given range request by manipulating the fixed MTRRs that
378: * cover low memory.
379: *
380: * Note that we try to be generous here; we'll bloat the range out to the
381: * next higher/lower boundary to avoid the consumer having to know too much
382: * about the mechanisms here.
383: *
384: * XXX note that this will have to be updated when we start supporting "busy" ranges.
385: */
386: int
387: i686_mrsetlow(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg)
388: {
389: struct mem_range_desc *first_md, *last_md, *curr_md;
390:
391: /* range check */
392: if (((first_md = i686_mtrrfixsearch(sc, mrd->mr_base)) == NULL) ||
393: ((last_md = i686_mtrrfixsearch(sc, mrd->mr_base + mrd->mr_len - 1)) == NULL))
394: return(EINVAL);
395:
396: /* check we aren't doing something risky */
397: if (!(mrd->mr_flags & MDF_FORCE))
398: for (curr_md = first_md; curr_md <= last_md; curr_md++) {
399: if ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN)
400: return (EACCES);
401: }
402:
403: /* set flags, clear set-by-firmware flag */
404: for (curr_md = first_md; curr_md <= last_md; curr_md++) {
405: curr_md->mr_flags = mrcopyflags(curr_md->mr_flags & ~MDF_FIRMWARE, mrd->mr_flags);
406: bcopy(mrd->mr_owner, curr_md->mr_owner, sizeof(mrd->mr_owner));
407: }
408:
409: return(0);
410: }
411:
412:
413: /*
414: * Modify/add a variable MTRR to satisfy the request.
415: *
416: * XXX needs to be updated to properly support "busy" ranges.
417: */
418: int
419: i686_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd,
420: int *arg)
421: {
422: struct mem_range_desc *curr_md, *free_md;
423: int i;
424:
425: /*
426: * Scan the currently active variable descriptors, look for
427: * one we exactly match (straight takeover) and for possible
428: * accidental overlaps.
429: * Keep track of the first empty variable descriptor in case we
430: * can't perform a takeover.
431: */
432: i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0;
433: curr_md = sc->mr_desc + i;
434: free_md = NULL;
435: for (; i < sc->mr_ndesc; i++, curr_md++) {
436: if (curr_md->mr_flags & MDF_ACTIVE) {
437: /* exact match? */
438: if ((curr_md->mr_base == mrd->mr_base) &&
439: (curr_md->mr_len == mrd->mr_len)) {
440: /* whoops, owned by someone */
441: if (curr_md->mr_flags & MDF_BUSY)
442: return(EBUSY);
443: /* check we aren't doing something risky */
444: if (!(mrd->mr_flags & MDF_FORCE) &&
445: ((curr_md->mr_flags & MDF_ATTRMASK)
446: == MDF_UNKNOWN))
447: return (EACCES);
448: /* Ok, just hijack this entry */
449: free_md = curr_md;
450: break;
451: }
452: /* non-exact overlap ? */
453: if (mroverlap(curr_md, mrd)) {
454: /* between conflicting region types? */
455: if (i686_mtrrconflict(curr_md->mr_flags,
456: mrd->mr_flags))
457: return(EINVAL);
458: }
459: } else if (free_md == NULL) {
460: free_md = curr_md;
461: }
462: }
463: /* got somewhere to put it? */
464: if (free_md == NULL)
465: return(ENOSPC);
466:
467: /* Set up new descriptor */
468: free_md->mr_base = mrd->mr_base;
469: free_md->mr_len = mrd->mr_len;
470: free_md->mr_flags = mrcopyflags(MDF_ACTIVE, mrd->mr_flags);
471: bcopy(mrd->mr_owner, free_md->mr_owner, sizeof(mrd->mr_owner));
472: return(0);
473: }
474:
475: /*
476: * Handle requests to set memory range attributes by manipulating MTRRs.
477: *
478: */
479: int
480: i686_mrset(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg)
481: {
482: struct mem_range_desc *targ;
483: int error = 0;
484:
485: switch(*arg) {
486: case MEMRANGE_SET_UPDATE:
487: /* make sure that what's being asked for is even possible at all */
488: if (!mrvalid(mrd->mr_base, mrd->mr_len) ||
489: i686_mtrrtype(mrd->mr_flags) == -1)
490: return(EINVAL);
491:
492: #define FIXTOP ((MTRR_N64K * 0x10000) + (MTRR_N16K * 0x4000) + (MTRR_N4K * 0x1000))
493:
494: /* are the "low memory" conditions applicable? */
495: if ((sc->mr_cap & MR686_FIXMTRR) &&
496: ((mrd->mr_base + mrd->mr_len) <= FIXTOP)) {
497: if ((error = i686_mrsetlow(sc, mrd, arg)) != 0)
498: return(error);
499: } else {
500: /* it's time to play with variable MTRRs */
501: if ((error = i686_mrsetvariable(sc, mrd, arg)) != 0)
502: return(error);
503: }
504: break;
505:
506: case MEMRANGE_SET_REMOVE:
507: if ((targ = mem_range_match(sc, mrd)) == NULL)
508: return(ENOENT);
509: if (targ->mr_flags & MDF_FIXACTIVE)
510: return(EPERM);
511: if (targ->mr_flags & MDF_BUSY)
512: return(EBUSY);
513: targ->mr_flags &= ~MDF_ACTIVE;
514: targ->mr_owner[0] = 0;
515: break;
516:
517: default:
518: return(EOPNOTSUPP);
519: }
520:
521: /* update the hardware */
522: i686_mrstore(sc);
523: i686_mrfetch(sc); /* refetch to see where we're at */
524: return(0);
525: }
526:
527: /*
528: * Work out how many ranges we support, initialise storage for them,
529: * fetch the initial settings.
530: */
531: void
532: i686_mrinit(struct mem_range_softc *sc)
533: {
534: struct mem_range_desc *mrd;
535: int nmdesc = 0;
536: int i;
537:
538: mtrrcap = rdmsr(MSR_MTRRcap);
539: mtrrdef = rdmsr(MSR_MTRRdefType);
540:
541: /* For now, bail out if MTRRs are not enabled */
542: if (!(mtrrdef & 0x800)) {
543: printf("mtrr: CPU supports MTRRs but not enabled\n");
544: return;
545: }
546: nmdesc = mtrrcap & 0xff;
547: printf("mtrr: Pentium Pro MTRR support\n");
548:
549: /* If fixed MTRRs supported and enabled */
550: if ((mtrrcap & 0x100) && (mtrrdef & 0x400)) {
551: sc->mr_cap = MR686_FIXMTRR;
552: nmdesc += MTRR_N64K + MTRR_N16K + MTRR_N4K;
553: }
554:
555: sc->mr_desc = malloc(nmdesc * sizeof(struct mem_range_desc),
556: M_MEMDESC, M_WAITOK);
557: bzero(sc->mr_desc, nmdesc * sizeof(struct mem_range_desc));
558: sc->mr_ndesc = nmdesc;
559:
560: mrd = sc->mr_desc;
561:
562: /* Populate the fixed MTRR entries' base/length */
563: if (sc->mr_cap & MR686_FIXMTRR) {
564: for (i = 0; i < MTRR_N64K; i++, mrd++) {
565: mrd->mr_base = i * 0x10000;
566: mrd->mr_len = 0x10000;
567: mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE;
568: }
569: for (i = 0; i < MTRR_N16K; i++, mrd++) {
570: mrd->mr_base = i * 0x4000 + 0x80000;
571: mrd->mr_len = 0x4000;
572: mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE;
573: }
574: for (i = 0; i < MTRR_N4K; i++, mrd++) {
575: mrd->mr_base = i * 0x1000 + 0xc0000;
576: mrd->mr_len = 0x1000;
577: mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE;
578: }
579: }
580:
581: /*
582: * Get current settings, anything set now is considered to have
583: * been set by the firmware. (XXX has something already played here?)
584: */
585: i686_mrfetch(sc);
586: mrd = sc->mr_desc;
587: for (i = 0; i < sc->mr_ndesc; i++, mrd++) {
588: if (mrd->mr_flags & MDF_ACTIVE)
589: mrd->mr_flags |= MDF_FIRMWARE;
590: }
591: }
592:
593: /*
594: * Initialise MTRRs on an AP after the BSP has run the init code.
595: */
596: void
597: i686_mrAPinit(struct mem_range_softc *sc)
598: {
599: i686_mrstoreone((void *)sc); /* set MTRRs to match BSP */
600: wrmsr(MSR_MTRRdefType, mtrrdef); /* set MTRR behaviour to match BSP */
601: }
602: