x86_mem.c revision 115683
145405Smsmith/*- 245405Smsmith * Copyright (c) 1999 Michael Smith <msmith@freebsd.org> 345405Smsmith * All rights reserved. 445405Smsmith * 545405Smsmith * Redistribution and use in source and binary forms, with or without 645405Smsmith * modification, are permitted provided that the following conditions 745405Smsmith * are met: 845405Smsmith * 1. Redistributions of source code must retain the above copyright 945405Smsmith * notice, this list of conditions and the following disclaimer. 1045405Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1145405Smsmith * notice, this list of conditions and the following disclaimer in the 1245405Smsmith * documentation and/or other materials provided with the distribution. 1345405Smsmith * 1445405Smsmith * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1545405Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1645405Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1745405Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1845405Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1945405Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2045405Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2145405Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2245405Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2345405Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2445405Smsmith * SUCH DAMAGE. 2545405Smsmith * 2645405Smsmith */ 2745405Smsmith 28115683Sobrien#include <sys/cdefs.h> 29115683Sobrien__FBSDID("$FreeBSD: head/sys/i386/i386/i686_mem.c 115683 2003-06-02 06:43:15Z obrien $"); 30115683Sobrien 3145405Smsmith#include <sys/param.h> 3245405Smsmith#include <sys/kernel.h> 3345405Smsmith#include <sys/systm.h> 3445405Smsmith#include <sys/malloc.h> 3545405Smsmith#include <sys/memrange.h> 3676078Sjhb#include <sys/smp.h> 37106842Smdodd#include <sys/sysctl.h> 3845405Smsmith 3945405Smsmith#include <machine/md_var.h> 4045405Smsmith#include <machine/specialreg.h> 4145405Smsmith 4245405Smsmith/* 4345405Smsmith * i686 memory range operations 4445405Smsmith * 4545405Smsmith * This code will probably be impenetrable without reference to the 4645405Smsmith * Intel Pentium Pro documentation. 4745405Smsmith */ 4845405Smsmith 4945405Smsmithstatic char *mem_owner_bios = "BIOS"; 5045405Smsmith 5145405Smsmith#define MR686_FIXMTRR (1<<0) 5245405Smsmith 5345405Smsmith#define mrwithin(mr, a) \ 5445405Smsmith (((a) >= (mr)->mr_base) && ((a) < ((mr)->mr_base + (mr)->mr_len))) 5545405Smsmith#define mroverlap(mra, mrb) \ 5645405Smsmith (mrwithin(mra, mrb->mr_base) || mrwithin(mrb, mra->mr_base)) 5745405Smsmith 5845405Smsmith#define mrvalid(base, len) \ 5945405Smsmith ((!(base & ((1 << 12) - 1))) && /* base is multiple of 4k */ \ 6045405Smsmith ((len) >= (1 << 12)) && /* length is >= 4k */ \ 6145405Smsmith powerof2((len)) && /* ... and power of two */ \ 6245405Smsmith !((base) & ((len) - 1))) /* range is not discontiuous */ 6345405Smsmith 6445405Smsmith#define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK)) 6545405Smsmith 66106842Smdoddstatic int mtrrs_disabled; 67106842SmdoddTUNABLE_INT("machdep.disable_mtrrs", &mtrrs_disabled); 68106842SmdoddSYSCTL_INT(_machdep, OID_AUTO, disable_mtrrs, CTLFLAG_RD, 69106842Smdodd &mtrrs_disabled, 0, "Disable i686 MTRRs."); 70106842Smdodd 7146215Smsmithstatic void i686_mrinit(struct mem_range_softc *sc); 7246215Smsmithstatic int i686_mrset(struct mem_range_softc *sc, 7346215Smsmith struct mem_range_desc *mrd, 7446215Smsmith int *arg); 7546215Smsmithstatic void i686_mrAPinit(struct mem_range_softc *sc); 7645405Smsmith 7745405Smsmithstatic struct mem_range_ops i686_mrops = { 7845405Smsmith i686_mrinit, 7946215Smsmith i686_mrset, 8046215Smsmith i686_mrAPinit 8145405Smsmith}; 8245405Smsmith 8346215Smsmith/* XXX for AP startup hook */ 8446215Smsmithstatic u_int64_t mtrrcap, mtrrdef; 8546215Smsmith 8645405Smsmithstatic struct mem_range_desc *mem_range_match(struct mem_range_softc *sc, 8745405Smsmith struct mem_range_desc *mrd); 8845405Smsmithstatic void i686_mrfetch(struct mem_range_softc *sc); 8945405Smsmithstatic int i686_mtrrtype(int flags); 9094683Sdwmalonestatic int i686_mrt2mtrr(int flags, int oldval); 9194683Sdwmalonestatic int i686_mtrrconflict(int flag1, int flag2); 9248925Smsmithstatic void i686_mrstore(struct mem_range_softc *sc); 9348925Smsmithstatic void i686_mrstoreone(void *arg); 9445405Smsmithstatic struct mem_range_desc *i686_mtrrfixsearch(struct mem_range_softc *sc, 9545405Smsmith u_int64_t addr); 9645405Smsmithstatic int i686_mrsetlow(struct mem_range_softc *sc, 9745405Smsmith struct mem_range_desc *mrd, 9845405Smsmith int *arg); 9945405Smsmithstatic int i686_mrsetvariable(struct mem_range_softc *sc, 10045405Smsmith struct mem_range_desc *mrd, 10145405Smsmith int *arg); 10245405Smsmith 10345405Smsmith/* i686 MTRR type to memory range type conversion */ 10445405Smsmithstatic int i686_mtrrtomrt[] = { 10545405Smsmith MDF_UNCACHEABLE, 10645405Smsmith MDF_WRITECOMBINE, 10794683Sdwmalone MDF_UNKNOWN, 10894683Sdwmalone MDF_UNKNOWN, 10945405Smsmith MDF_WRITETHROUGH, 11045405Smsmith MDF_WRITEPROTECT, 11145405Smsmith MDF_WRITEBACK 11245405Smsmith}; 11345405Smsmith 11494683Sdwmalone#define MTRRTOMRTLEN (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0])) 11594683Sdwmalone 11694683Sdwmalonestatic int 11794683Sdwmalonei686_mtrr2mrt(int val) { 11894683Sdwmalone if (val < 0 || val >= MTRRTOMRTLEN) 11994683Sdwmalone return MDF_UNKNOWN; 12094683Sdwmalone return i686_mtrrtomrt[val]; 12194683Sdwmalone} 12294683Sdwmalone 12348925Smsmith/* 12494683Sdwmalone * i686 MTRR conflicts. Writeback and uncachable may overlap. 12548925Smsmith */ 12694683Sdwmalonestatic int 12794683Sdwmalonei686_mtrrconflict(int flag1, int flag2) { 12894683Sdwmalone flag1 &= MDF_ATTRMASK; 12994683Sdwmalone flag2 &= MDF_ATTRMASK; 13094683Sdwmalone if (flag1 == flag2 || 13194683Sdwmalone (flag1 == MDF_WRITEBACK && flag2 == MDF_UNCACHEABLE) || 13294683Sdwmalone (flag2 == MDF_WRITEBACK && flag1 == MDF_UNCACHEABLE)) 13394683Sdwmalone return 0; 13494683Sdwmalone return 1; 13594683Sdwmalone} 13645405Smsmith 13745405Smsmith/* 13845405Smsmith * Look for an exactly-matching range. 13945405Smsmith */ 14045405Smsmithstatic struct mem_range_desc * 14145405Smsmithmem_range_match(struct mem_range_softc *sc, struct mem_range_desc *mrd) 14245405Smsmith{ 14345405Smsmith struct mem_range_desc *cand; 14445405Smsmith int i; 14545405Smsmith 14645405Smsmith for (i = 0, cand = sc->mr_desc; i < sc->mr_ndesc; i++, cand++) 14745405Smsmith if ((cand->mr_base == mrd->mr_base) && 14845405Smsmith (cand->mr_len == mrd->mr_len)) 14945405Smsmith return(cand); 15045405Smsmith return(NULL); 15145405Smsmith} 15245405Smsmith 15345405Smsmith/* 15445405Smsmith * Fetch the current mtrr settings from the current CPU (assumed to all 15545405Smsmith * be in sync in the SMP case). Note that if we are here, we assume 15645405Smsmith * that MTRRs are enabled, and we may or may not have fixed MTRRs. 15745405Smsmith */ 15845405Smsmithstatic void 15945405Smsmithi686_mrfetch(struct mem_range_softc *sc) 16045405Smsmith{ 16145405Smsmith struct mem_range_desc *mrd; 16245405Smsmith u_int64_t msrv; 16345405Smsmith int i, j, msr; 16445405Smsmith 16545405Smsmith mrd = sc->mr_desc; 16645405Smsmith 16745405Smsmith /* Get fixed-range MTRRs */ 16845405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 16945405Smsmith msr = MSR_MTRR64kBase; 17045405Smsmith for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { 17145405Smsmith msrv = rdmsr(msr); 17245405Smsmith for (j = 0; j < 8; j++, mrd++) { 17345405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 17494683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 17545405Smsmith MDF_ACTIVE; 17645405Smsmith if (mrd->mr_owner[0] == 0) 17745405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 17845405Smsmith msrv = msrv >> 8; 17945405Smsmith } 18045405Smsmith } 18145405Smsmith msr = MSR_MTRR16kBase; 18245405Smsmith for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { 18345405Smsmith msrv = rdmsr(msr); 18445405Smsmith for (j = 0; j < 8; j++, mrd++) { 18545405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 18694683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 18745405Smsmith MDF_ACTIVE; 18845405Smsmith if (mrd->mr_owner[0] == 0) 18945405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 19045405Smsmith msrv = msrv >> 8; 19145405Smsmith } 19245405Smsmith } 19345405Smsmith msr = MSR_MTRR4kBase; 19445405Smsmith for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { 19545405Smsmith msrv = rdmsr(msr); 19645405Smsmith for (j = 0; j < 8; j++, mrd++) { 19745405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 19894683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 19945405Smsmith MDF_ACTIVE; 20045405Smsmith if (mrd->mr_owner[0] == 0) 20145405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 20245405Smsmith msrv = msrv >> 8; 20345405Smsmith } 20445405Smsmith } 20545405Smsmith } 20645405Smsmith 20745405Smsmith /* Get remainder which must be variable MTRRs */ 20845405Smsmith msr = MSR_MTRRVarBase; 20945405Smsmith for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { 21045405Smsmith msrv = rdmsr(msr); 21145405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 21294683Sdwmalone i686_mtrr2mrt(msrv & 0xff); 21345405Smsmith mrd->mr_base = msrv & 0x0000000ffffff000LL; 21445405Smsmith msrv = rdmsr(msr + 1); 21545405Smsmith mrd->mr_flags = (msrv & 0x800) ? 21645405Smsmith (mrd->mr_flags | MDF_ACTIVE) : 21745405Smsmith (mrd->mr_flags & ~MDF_ACTIVE); 21845405Smsmith /* Compute the range from the mask. Ick. */ 21945405Smsmith mrd->mr_len = (~(msrv & 0x0000000ffffff000LL) & 0x0000000fffffffffLL) + 1; 22045405Smsmith if (!mrvalid(mrd->mr_base, mrd->mr_len)) 22145405Smsmith mrd->mr_flags |= MDF_BOGUS; 22245405Smsmith /* If unclaimed and active, must be the BIOS */ 22345405Smsmith if ((mrd->mr_flags & MDF_ACTIVE) && (mrd->mr_owner[0] == 0)) 22445405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 22545405Smsmith } 22645405Smsmith} 22745405Smsmith 22845405Smsmith/* 22945405Smsmith * Return the MTRR memory type matching a region's flags 23045405Smsmith */ 23145405Smsmithstatic int 23245405Smsmithi686_mtrrtype(int flags) 23345405Smsmith{ 23445405Smsmith int i; 23545405Smsmith 23645405Smsmith flags &= MDF_ATTRMASK; 23745405Smsmith 23894683Sdwmalone for (i = 0; i < MTRRTOMRTLEN; i++) { 23994683Sdwmalone if (i686_mtrrtomrt[i] == MDF_UNKNOWN) 24045405Smsmith continue; 24145405Smsmith if (flags == i686_mtrrtomrt[i]) 24245405Smsmith return(i); 24345405Smsmith } 24445405Smsmith return(-1); 24545405Smsmith} 24645405Smsmith 24794683Sdwmalonestatic int 24894683Sdwmalonei686_mrt2mtrr(int flags, int oldval) 24994683Sdwmalone{ 25094683Sdwmalone int val; 25194683Sdwmalone 25294683Sdwmalone if ((val = i686_mtrrtype(flags)) == -1) 25394683Sdwmalone return oldval & 0xff; 25494683Sdwmalone return val & 0xff; 25594683Sdwmalone} 25694683Sdwmalone 25745405Smsmith/* 25846215Smsmith * Update running CPU(s) MTRRs to match the ranges in the descriptor 25946215Smsmith * list. 26046215Smsmith * 26146215Smsmith * XXX Must be called with interrupts enabled. 26245405Smsmith */ 26348925Smsmithstatic void 26445405Smsmithi686_mrstore(struct mem_range_softc *sc) 26545405Smsmith{ 26645405Smsmith#ifdef SMP 26745405Smsmith /* 26875421Sjhb * We should use ipi_all_but_self() to call other CPUs into a 26945405Smsmith * locking gate, then call a target function to do this work. 27045405Smsmith * The "proper" solution involves a generalised locking gate 27145405Smsmith * implementation, not ready yet. 27245405Smsmith */ 27348925Smsmith smp_rendezvous(NULL, i686_mrstoreone, NULL, (void *)sc); 27448925Smsmith#else 27545405Smsmith disable_intr(); /* disable interrupts */ 27649421Smsmith i686_mrstoreone((void *)sc); 27746215Smsmith enable_intr(); 27848925Smsmith#endif 27946215Smsmith} 28046215Smsmith 28146215Smsmith/* 28246215Smsmith * Update the current CPU's MTRRs with those represented in the 28348925Smsmith * descriptor list. Note that we do this wholesale rather than 28448925Smsmith * just stuffing one entry; this is simpler (but slower, of course). 28546215Smsmith */ 28648925Smsmithstatic void 28748925Smsmithi686_mrstoreone(void *arg) 28846215Smsmith{ 28948925Smsmith struct mem_range_softc *sc = (struct mem_range_softc *)arg; 29046215Smsmith struct mem_range_desc *mrd; 29194683Sdwmalone u_int64_t omsrv, msrv; 29246215Smsmith int i, j, msr; 29346215Smsmith u_int cr4save; 29446215Smsmith 29548925Smsmith mrd = sc->mr_desc; 29646215Smsmith 29745405Smsmith cr4save = rcr4(); /* save cr4 */ 29845405Smsmith if (cr4save & CR4_PGE) 29945405Smsmith load_cr4(cr4save & ~CR4_PGE); 30045405Smsmith load_cr0((rcr0() & ~CR0_NW) | CR0_CD); /* disable caches (CD = 1, NW = 0) */ 30148925Smsmith wbinvd(); /* flush caches, TLBs */ 30245405Smsmith wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) & ~0x800); /* disable MTRRs (E = 0) */ 30345405Smsmith 30445405Smsmith /* Set fixed-range MTRRs */ 30545405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 30645405Smsmith msr = MSR_MTRR64kBase; 30745405Smsmith for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { 30845405Smsmith msrv = 0; 30994683Sdwmalone omsrv = rdmsr(msr); 31045405Smsmith for (j = 7; j >= 0; j--) { 31145405Smsmith msrv = msrv << 8; 31294683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 31345405Smsmith } 31445405Smsmith wrmsr(msr, msrv); 31545405Smsmith mrd += 8; 31645405Smsmith } 31745405Smsmith msr = MSR_MTRR16kBase; 31845405Smsmith for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { 31945405Smsmith msrv = 0; 32094683Sdwmalone omsrv = rdmsr(msr); 32145405Smsmith for (j = 7; j >= 0; j--) { 32245405Smsmith msrv = msrv << 8; 32394683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 32445405Smsmith } 32545405Smsmith wrmsr(msr, msrv); 32645405Smsmith mrd += 8; 32745405Smsmith } 32845405Smsmith msr = MSR_MTRR4kBase; 32945405Smsmith for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { 33045405Smsmith msrv = 0; 33194683Sdwmalone omsrv = rdmsr(msr); 33245405Smsmith for (j = 7; j >= 0; j--) { 33345405Smsmith msrv = msrv << 8; 33494683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 33545405Smsmith } 33645405Smsmith wrmsr(msr, msrv); 33745405Smsmith mrd += 8; 33845405Smsmith } 33945405Smsmith } 34045405Smsmith 34145405Smsmith /* Set remainder which must be variable MTRRs */ 34245405Smsmith msr = MSR_MTRRVarBase; 34345405Smsmith for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { 34445405Smsmith /* base/type register */ 34594683Sdwmalone omsrv = rdmsr(msr); 34645405Smsmith if (mrd->mr_flags & MDF_ACTIVE) { 34745405Smsmith msrv = mrd->mr_base & 0x0000000ffffff000LL; 34894683Sdwmalone msrv |= i686_mrt2mtrr(mrd->mr_flags, omsrv); 34945405Smsmith } else { 35045405Smsmith msrv = 0; 35145405Smsmith } 35245405Smsmith wrmsr(msr, msrv); 35345405Smsmith 35445405Smsmith /* mask/active register */ 35545405Smsmith if (mrd->mr_flags & MDF_ACTIVE) { 35645405Smsmith msrv = 0x800 | (~(mrd->mr_len - 1) & 0x0000000ffffff000LL); 35745405Smsmith } else { 35845405Smsmith msrv = 0; 35945405Smsmith } 36045405Smsmith wrmsr(msr + 1, msrv); 36145405Smsmith } 36248925Smsmith wbinvd(); /* flush caches, TLBs */ 36345405Smsmith wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) | 0x800); /* restore MTRR state */ 36445405Smsmith load_cr0(rcr0() & ~(CR0_CD | CR0_NW)); /* enable caches CD = 0 and NW = 0 */ 36545405Smsmith load_cr4(cr4save); /* restore cr4 */ 36645405Smsmith} 36745405Smsmith 36845405Smsmith/* 36945405Smsmith * Hunt for the fixed MTRR referencing (addr) 37045405Smsmith */ 37145405Smsmithstatic struct mem_range_desc * 37245405Smsmithi686_mtrrfixsearch(struct mem_range_softc *sc, u_int64_t addr) 37345405Smsmith{ 37445405Smsmith struct mem_range_desc *mrd; 37545405Smsmith int i; 37645405Smsmith 37745405Smsmith for (i = 0, mrd = sc->mr_desc; i < (MTRR_N64K + MTRR_N16K + MTRR_N4K); i++, mrd++) 37845405Smsmith if ((addr >= mrd->mr_base) && (addr < (mrd->mr_base + mrd->mr_len))) 37945405Smsmith return(mrd); 38045405Smsmith return(NULL); 38145405Smsmith} 38245405Smsmith 38345405Smsmith/* 38445405Smsmith * Try to satisfy the given range request by manipulating the fixed MTRRs that 38545405Smsmith * cover low memory. 38645405Smsmith * 38745405Smsmith * Note that we try to be generous here; we'll bloat the range out to the 38845405Smsmith * next higher/lower boundary to avoid the consumer having to know too much 38945405Smsmith * about the mechanisms here. 39045405Smsmith * 39145405Smsmith * XXX note that this will have to be updated when we start supporting "busy" ranges. 39245405Smsmith */ 39345405Smsmithstatic int 39445405Smsmithi686_mrsetlow(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 39545405Smsmith{ 39645405Smsmith struct mem_range_desc *first_md, *last_md, *curr_md; 39745405Smsmith 39845405Smsmith /* range check */ 39945405Smsmith if (((first_md = i686_mtrrfixsearch(sc, mrd->mr_base)) == NULL) || 40045405Smsmith ((last_md = i686_mtrrfixsearch(sc, mrd->mr_base + mrd->mr_len - 1)) == NULL)) 40145405Smsmith return(EINVAL); 40245405Smsmith 403103346Sdwmalone /* check we aren't doing something risky */ 404103346Sdwmalone if (!(mrd->mr_flags & MDF_FORCE)) 405103346Sdwmalone for (curr_md = first_md; curr_md <= last_md; curr_md++) { 406103346Sdwmalone if ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN) 407103346Sdwmalone return (EACCES); 408103346Sdwmalone } 409103346Sdwmalone 41045405Smsmith /* set flags, clear set-by-firmware flag */ 41145405Smsmith for (curr_md = first_md; curr_md <= last_md; curr_md++) { 41245405Smsmith curr_md->mr_flags = mrcopyflags(curr_md->mr_flags & ~MDF_FIRMWARE, mrd->mr_flags); 41345405Smsmith bcopy(mrd->mr_owner, curr_md->mr_owner, sizeof(mrd->mr_owner)); 41445405Smsmith } 41545405Smsmith 41645405Smsmith return(0); 41745405Smsmith} 41845405Smsmith 41945405Smsmith 42045405Smsmith/* 42145405Smsmith * Modify/add a variable MTRR to satisfy the request. 42245405Smsmith * 42345405Smsmith * XXX needs to be updated to properly support "busy" ranges. 42445405Smsmith */ 42545405Smsmithstatic int 42645405Smsmithi686_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 42745405Smsmith{ 42845405Smsmith struct mem_range_desc *curr_md, *free_md; 42945405Smsmith int i; 43045405Smsmith 43145405Smsmith /* 43245405Smsmith * Scan the currently active variable descriptors, look for 43345405Smsmith * one we exactly match (straight takeover) and for possible 43445405Smsmith * accidental overlaps. 43545405Smsmith * Keep track of the first empty variable descriptor in case we 43645405Smsmith * can't perform a takeover. 43745405Smsmith */ 43845405Smsmith i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0; 43945405Smsmith curr_md = sc->mr_desc + i; 44045405Smsmith free_md = NULL; 44145405Smsmith for (; i < sc->mr_ndesc; i++, curr_md++) { 44245405Smsmith if (curr_md->mr_flags & MDF_ACTIVE) { 44345405Smsmith /* exact match? */ 44445405Smsmith if ((curr_md->mr_base == mrd->mr_base) && 44545405Smsmith (curr_md->mr_len == mrd->mr_len)) { 44645405Smsmith /* whoops, owned by someone */ 44745405Smsmith if (curr_md->mr_flags & MDF_BUSY) 44845405Smsmith return(EBUSY); 449103346Sdwmalone /* check we aren't doing something risky */ 450103346Sdwmalone if (!(mrd->mr_flags & MDF_FORCE) && 451103346Sdwmalone ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN)) 452103346Sdwmalone return (EACCES); 45345405Smsmith /* Ok, just hijack this entry */ 45445405Smsmith free_md = curr_md; 45545405Smsmith break; 45645405Smsmith } 45748925Smsmith /* non-exact overlap ? */ 45848925Smsmith if (mroverlap(curr_md, mrd)) { 45948925Smsmith /* between conflicting region types? */ 46094683Sdwmalone if (i686_mtrrconflict(curr_md->mr_flags, mrd->mr_flags)) 46148925Smsmith return(EINVAL); 46248925Smsmith } 46345405Smsmith } else if (free_md == NULL) { 46445405Smsmith free_md = curr_md; 46545405Smsmith } 46645405Smsmith } 46745405Smsmith /* got somewhere to put it? */ 46845405Smsmith if (free_md == NULL) 46945405Smsmith return(ENOSPC); 47045405Smsmith 47145405Smsmith /* Set up new descriptor */ 47245405Smsmith free_md->mr_base = mrd->mr_base; 47345405Smsmith free_md->mr_len = mrd->mr_len; 47445405Smsmith free_md->mr_flags = mrcopyflags(MDF_ACTIVE, mrd->mr_flags); 47545405Smsmith bcopy(mrd->mr_owner, free_md->mr_owner, sizeof(mrd->mr_owner)); 47645405Smsmith return(0); 47745405Smsmith} 47845405Smsmith 47945405Smsmith/* 48045405Smsmith * Handle requests to set memory range attributes by manipulating MTRRs. 48145405Smsmith * 48245405Smsmith */ 48345405Smsmithstatic int 48445405Smsmithi686_mrset(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 48545405Smsmith{ 48645405Smsmith struct mem_range_desc *targ; 48745405Smsmith int error = 0; 48845405Smsmith 48945405Smsmith switch(*arg) { 49045405Smsmith case MEMRANGE_SET_UPDATE: 49145405Smsmith /* make sure that what's being asked for is even possible at all */ 49245405Smsmith if (!mrvalid(mrd->mr_base, mrd->mr_len) || 49394683Sdwmalone i686_mtrrtype(mrd->mr_flags) == -1) 49445405Smsmith return(EINVAL); 49545405Smsmith 49645405Smsmith#define FIXTOP ((MTRR_N64K * 0x10000) + (MTRR_N16K * 0x4000) + (MTRR_N4K * 0x1000)) 49745405Smsmith 49845405Smsmith /* are the "low memory" conditions applicable? */ 49945405Smsmith if ((sc->mr_cap & MR686_FIXMTRR) && 50045405Smsmith ((mrd->mr_base + mrd->mr_len) <= FIXTOP)) { 50145405Smsmith if ((error = i686_mrsetlow(sc, mrd, arg)) != 0) 50245405Smsmith return(error); 50345405Smsmith } else { 50445405Smsmith /* it's time to play with variable MTRRs */ 50545405Smsmith if ((error = i686_mrsetvariable(sc, mrd, arg)) != 0) 50645405Smsmith return(error); 50745405Smsmith } 50845405Smsmith break; 50945405Smsmith 51045405Smsmith case MEMRANGE_SET_REMOVE: 51145405Smsmith if ((targ = mem_range_match(sc, mrd)) == NULL) 51245405Smsmith return(ENOENT); 51345405Smsmith if (targ->mr_flags & MDF_FIXACTIVE) 51445405Smsmith return(EPERM); 51545405Smsmith if (targ->mr_flags & MDF_BUSY) 51645405Smsmith return(EBUSY); 51745405Smsmith targ->mr_flags &= ~MDF_ACTIVE; 51845405Smsmith targ->mr_owner[0] = 0; 51945405Smsmith break; 52045405Smsmith 52145405Smsmith default: 52245405Smsmith return(EOPNOTSUPP); 52345405Smsmith } 52445405Smsmith 52545405Smsmith /* update the hardware */ 52648925Smsmith i686_mrstore(sc); 52745405Smsmith i686_mrfetch(sc); /* refetch to see where we're at */ 52848925Smsmith return(0); 52945405Smsmith} 53045405Smsmith 53145405Smsmith/* 53245405Smsmith * Work out how many ranges we support, initialise storage for them, 53345405Smsmith * fetch the initial settings. 53445405Smsmith */ 53545405Smsmithstatic void 53645405Smsmithi686_mrinit(struct mem_range_softc *sc) 53745405Smsmith{ 53845405Smsmith struct mem_range_desc *mrd; 53945405Smsmith int nmdesc = 0; 54045405Smsmith int i; 54145405Smsmith 54245405Smsmith mtrrcap = rdmsr(MSR_MTRRcap); 54345405Smsmith mtrrdef = rdmsr(MSR_MTRRdefType); 54445405Smsmith 54545405Smsmith /* For now, bail out if MTRRs are not enabled */ 54645405Smsmith if (!(mtrrdef & 0x800)) { 54745405Smsmith if (bootverbose) 54845405Smsmith printf("CPU supports MTRRs but not enabled\n"); 54945405Smsmith return; 55045405Smsmith } 55145405Smsmith nmdesc = mtrrcap & 0xff; 55248925Smsmith printf("Pentium Pro MTRR support enabled\n"); 55345405Smsmith 55445405Smsmith /* If fixed MTRRs supported and enabled */ 55545405Smsmith if ((mtrrcap & 0x100) && (mtrrdef & 0x400)) { 55645405Smsmith sc->mr_cap = MR686_FIXMTRR; 55745405Smsmith nmdesc += MTRR_N64K + MTRR_N16K + MTRR_N4K; 55845405Smsmith } 55945405Smsmith 56045405Smsmith sc->mr_desc = 56145405Smsmith (struct mem_range_desc *)malloc(nmdesc * sizeof(struct mem_range_desc), 562111119Simp M_MEMDESC, M_WAITOK | M_ZERO); 56345405Smsmith sc->mr_ndesc = nmdesc; 56445405Smsmith 56545405Smsmith mrd = sc->mr_desc; 56645405Smsmith 56745405Smsmith /* Populate the fixed MTRR entries' base/length */ 56845405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 56945405Smsmith for (i = 0; i < MTRR_N64K; i++, mrd++) { 57045405Smsmith mrd->mr_base = i * 0x10000; 57145405Smsmith mrd->mr_len = 0x10000; 57245405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 57345405Smsmith } 57445405Smsmith for (i = 0; i < MTRR_N16K; i++, mrd++) { 57545405Smsmith mrd->mr_base = i * 0x4000 + 0x80000; 57645405Smsmith mrd->mr_len = 0x4000; 57745405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 57845405Smsmith } 57945405Smsmith for (i = 0; i < MTRR_N4K; i++, mrd++) { 58045405Smsmith mrd->mr_base = i * 0x1000 + 0xc0000; 58145405Smsmith mrd->mr_len = 0x1000; 58245405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 58345405Smsmith } 58445405Smsmith } 58545405Smsmith 58645405Smsmith /* 58745405Smsmith * Get current settings, anything set now is considered to have 58845405Smsmith * been set by the firmware. (XXX has something already played here?) 58945405Smsmith */ 59045405Smsmith i686_mrfetch(sc); 59145405Smsmith mrd = sc->mr_desc; 59245405Smsmith for (i = 0; i < sc->mr_ndesc; i++, mrd++) { 59345405Smsmith if (mrd->mr_flags & MDF_ACTIVE) 59445405Smsmith mrd->mr_flags |= MDF_FIRMWARE; 59545405Smsmith } 59645405Smsmith} 59745405Smsmith 59846215Smsmith/* 59946215Smsmith * Initialise MTRRs on an AP after the BSP has run the init code. 60046215Smsmith */ 60145405Smsmithstatic void 60246215Smsmithi686_mrAPinit(struct mem_range_softc *sc) 60346215Smsmith{ 60448925Smsmith i686_mrstoreone((void *)sc); /* set MTRRs to match BSP */ 60546215Smsmith wrmsr(MSR_MTRRdefType, mtrrdef); /* set MTRR behaviour to match BSP */ 60646215Smsmith} 60746215Smsmith 60846215Smsmithstatic void 60945405Smsmithi686_mem_drvinit(void *unused) 61045405Smsmith{ 61145405Smsmith /* Try for i686 MTRRs */ 612106842Smdodd if (!mtrrs_disabled && (cpu_feature & CPUID_MTRR) && 613103649Smdodd ((cpu_id & 0xf00) == 0x600 || (cpu_id & 0xf00) == 0xf00) && 61452177Sgreen ((strcmp(cpu_vendor, "GenuineIntel") == 0) || 61552177Sgreen (strcmp(cpu_vendor, "AuthenticAMD") == 0))) { 61645405Smsmith mem_range_softc.mr_op = &i686_mrops; 61745405Smsmith } 61845405Smsmith} 61945405Smsmith 62045405SmsmithSYSINIT(i686memdev,SI_SUB_DRIVERS,SI_ORDER_FIRST,i686_mem_drvinit,NULL) 62145405Smsmith 62245405Smsmith 623