x86_mem.c revision 94683
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 * 2650477Speter * $FreeBSD: head/sys/i386/i386/i686_mem.c 94683 2002-04-14 20:13:08Z dwmalone $ 2745405Smsmith */ 2845405Smsmith 2945405Smsmith#include <sys/param.h> 3045405Smsmith#include <sys/kernel.h> 3145405Smsmith#include <sys/systm.h> 3245405Smsmith#include <sys/malloc.h> 3345405Smsmith#include <sys/memrange.h> 3476078Sjhb#include <sys/smp.h> 3545405Smsmith 3645405Smsmith#include <machine/md_var.h> 3745405Smsmith#include <machine/specialreg.h> 3845405Smsmith 3945405Smsmith/* 4045405Smsmith * i686 memory range operations 4145405Smsmith * 4245405Smsmith * This code will probably be impenetrable without reference to the 4345405Smsmith * Intel Pentium Pro documentation. 4445405Smsmith */ 4545405Smsmith 4645405Smsmithstatic char *mem_owner_bios = "BIOS"; 4745405Smsmith 4845405Smsmith#define MR686_FIXMTRR (1<<0) 4945405Smsmith 5045405Smsmith#define mrwithin(mr, a) \ 5145405Smsmith (((a) >= (mr)->mr_base) && ((a) < ((mr)->mr_base + (mr)->mr_len))) 5245405Smsmith#define mroverlap(mra, mrb) \ 5345405Smsmith (mrwithin(mra, mrb->mr_base) || mrwithin(mrb, mra->mr_base)) 5445405Smsmith 5545405Smsmith#define mrvalid(base, len) \ 5645405Smsmith ((!(base & ((1 << 12) - 1))) && /* base is multiple of 4k */ \ 5745405Smsmith ((len) >= (1 << 12)) && /* length is >= 4k */ \ 5845405Smsmith powerof2((len)) && /* ... and power of two */ \ 5945405Smsmith !((base) & ((len) - 1))) /* range is not discontiuous */ 6045405Smsmith 6145405Smsmith#define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK)) 6245405Smsmith 6346215Smsmithstatic void i686_mrinit(struct mem_range_softc *sc); 6446215Smsmithstatic int i686_mrset(struct mem_range_softc *sc, 6546215Smsmith struct mem_range_desc *mrd, 6646215Smsmith int *arg); 6746215Smsmithstatic void i686_mrAPinit(struct mem_range_softc *sc); 6845405Smsmith 6945405Smsmithstatic struct mem_range_ops i686_mrops = { 7045405Smsmith i686_mrinit, 7146215Smsmith i686_mrset, 7246215Smsmith i686_mrAPinit 7345405Smsmith}; 7445405Smsmith 7546215Smsmith/* XXX for AP startup hook */ 7646215Smsmithstatic u_int64_t mtrrcap, mtrrdef; 7746215Smsmith 7845405Smsmithstatic struct mem_range_desc *mem_range_match(struct mem_range_softc *sc, 7945405Smsmith struct mem_range_desc *mrd); 8045405Smsmithstatic void i686_mrfetch(struct mem_range_softc *sc); 8145405Smsmithstatic int i686_mtrrtype(int flags); 8294683Sdwmalonestatic int i686_mrt2mtrr(int flags, int oldval); 8394683Sdwmalonestatic int i686_mtrrconflict(int flag1, int flag2); 8448925Smsmithstatic void i686_mrstore(struct mem_range_softc *sc); 8548925Smsmithstatic void i686_mrstoreone(void *arg); 8645405Smsmithstatic struct mem_range_desc *i686_mtrrfixsearch(struct mem_range_softc *sc, 8745405Smsmith u_int64_t addr); 8845405Smsmithstatic int i686_mrsetlow(struct mem_range_softc *sc, 8945405Smsmith struct mem_range_desc *mrd, 9045405Smsmith int *arg); 9145405Smsmithstatic int i686_mrsetvariable(struct mem_range_softc *sc, 9245405Smsmith struct mem_range_desc *mrd, 9345405Smsmith int *arg); 9445405Smsmith 9545405Smsmith/* i686 MTRR type to memory range type conversion */ 9645405Smsmithstatic int i686_mtrrtomrt[] = { 9745405Smsmith MDF_UNCACHEABLE, 9845405Smsmith MDF_WRITECOMBINE, 9994683Sdwmalone MDF_UNKNOWN, 10094683Sdwmalone MDF_UNKNOWN, 10145405Smsmith MDF_WRITETHROUGH, 10245405Smsmith MDF_WRITEPROTECT, 10345405Smsmith MDF_WRITEBACK 10445405Smsmith}; 10545405Smsmith 10694683Sdwmalone#define MTRRTOMRTLEN (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0])) 10794683Sdwmalone 10894683Sdwmalonestatic int 10994683Sdwmalonei686_mtrr2mrt(int val) { 11094683Sdwmalone if (val < 0 || val >= MTRRTOMRTLEN) 11194683Sdwmalone return MDF_UNKNOWN; 11294683Sdwmalone return i686_mtrrtomrt[val]; 11394683Sdwmalone} 11494683Sdwmalone 11548925Smsmith/* 11694683Sdwmalone * i686 MTRR conflicts. Writeback and uncachable may overlap. 11748925Smsmith */ 11894683Sdwmalonestatic int 11994683Sdwmalonei686_mtrrconflict(int flag1, int flag2) { 12094683Sdwmalone flag1 &= MDF_ATTRMASK; 12194683Sdwmalone flag2 &= MDF_ATTRMASK; 12294683Sdwmalone if (flag1 == flag2 || 12394683Sdwmalone (flag1 == MDF_WRITEBACK && flag2 == MDF_UNCACHEABLE) || 12494683Sdwmalone (flag2 == MDF_WRITEBACK && flag1 == MDF_UNCACHEABLE)) 12594683Sdwmalone return 0; 12694683Sdwmalone return 1; 12794683Sdwmalone} 12845405Smsmith 12945405Smsmith/* 13045405Smsmith * Look for an exactly-matching range. 13145405Smsmith */ 13245405Smsmithstatic struct mem_range_desc * 13345405Smsmithmem_range_match(struct mem_range_softc *sc, struct mem_range_desc *mrd) 13445405Smsmith{ 13545405Smsmith struct mem_range_desc *cand; 13645405Smsmith int i; 13745405Smsmith 13845405Smsmith for (i = 0, cand = sc->mr_desc; i < sc->mr_ndesc; i++, cand++) 13945405Smsmith if ((cand->mr_base == mrd->mr_base) && 14045405Smsmith (cand->mr_len == mrd->mr_len)) 14145405Smsmith return(cand); 14245405Smsmith return(NULL); 14345405Smsmith} 14445405Smsmith 14545405Smsmith/* 14645405Smsmith * Fetch the current mtrr settings from the current CPU (assumed to all 14745405Smsmith * be in sync in the SMP case). Note that if we are here, we assume 14845405Smsmith * that MTRRs are enabled, and we may or may not have fixed MTRRs. 14945405Smsmith */ 15045405Smsmithstatic void 15145405Smsmithi686_mrfetch(struct mem_range_softc *sc) 15245405Smsmith{ 15345405Smsmith struct mem_range_desc *mrd; 15445405Smsmith u_int64_t msrv; 15545405Smsmith int i, j, msr; 15645405Smsmith 15745405Smsmith mrd = sc->mr_desc; 15845405Smsmith 15945405Smsmith /* Get fixed-range MTRRs */ 16045405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 16145405Smsmith msr = MSR_MTRR64kBase; 16245405Smsmith for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { 16345405Smsmith msrv = rdmsr(msr); 16445405Smsmith for (j = 0; j < 8; j++, mrd++) { 16545405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 16694683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 16745405Smsmith MDF_ACTIVE; 16845405Smsmith if (mrd->mr_owner[0] == 0) 16945405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 17045405Smsmith msrv = msrv >> 8; 17145405Smsmith } 17245405Smsmith } 17345405Smsmith msr = MSR_MTRR16kBase; 17445405Smsmith for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { 17545405Smsmith msrv = rdmsr(msr); 17645405Smsmith for (j = 0; j < 8; j++, mrd++) { 17745405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 17894683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 17945405Smsmith MDF_ACTIVE; 18045405Smsmith if (mrd->mr_owner[0] == 0) 18145405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 18245405Smsmith msrv = msrv >> 8; 18345405Smsmith } 18445405Smsmith } 18545405Smsmith msr = MSR_MTRR4kBase; 18645405Smsmith for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { 18745405Smsmith msrv = rdmsr(msr); 18845405Smsmith for (j = 0; j < 8; j++, mrd++) { 18945405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 19094683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 19145405Smsmith MDF_ACTIVE; 19245405Smsmith if (mrd->mr_owner[0] == 0) 19345405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 19445405Smsmith msrv = msrv >> 8; 19545405Smsmith } 19645405Smsmith } 19745405Smsmith } 19845405Smsmith 19945405Smsmith /* Get remainder which must be variable MTRRs */ 20045405Smsmith msr = MSR_MTRRVarBase; 20145405Smsmith for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { 20245405Smsmith msrv = rdmsr(msr); 20345405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 20494683Sdwmalone i686_mtrr2mrt(msrv & 0xff); 20545405Smsmith mrd->mr_base = msrv & 0x0000000ffffff000LL; 20645405Smsmith msrv = rdmsr(msr + 1); 20745405Smsmith mrd->mr_flags = (msrv & 0x800) ? 20845405Smsmith (mrd->mr_flags | MDF_ACTIVE) : 20945405Smsmith (mrd->mr_flags & ~MDF_ACTIVE); 21045405Smsmith /* Compute the range from the mask. Ick. */ 21145405Smsmith mrd->mr_len = (~(msrv & 0x0000000ffffff000LL) & 0x0000000fffffffffLL) + 1; 21245405Smsmith if (!mrvalid(mrd->mr_base, mrd->mr_len)) 21345405Smsmith mrd->mr_flags |= MDF_BOGUS; 21445405Smsmith /* If unclaimed and active, must be the BIOS */ 21545405Smsmith if ((mrd->mr_flags & MDF_ACTIVE) && (mrd->mr_owner[0] == 0)) 21645405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 21745405Smsmith } 21845405Smsmith} 21945405Smsmith 22045405Smsmith/* 22145405Smsmith * Return the MTRR memory type matching a region's flags 22245405Smsmith */ 22345405Smsmithstatic int 22445405Smsmithi686_mtrrtype(int flags) 22545405Smsmith{ 22645405Smsmith int i; 22745405Smsmith 22845405Smsmith flags &= MDF_ATTRMASK; 22945405Smsmith 23094683Sdwmalone for (i = 0; i < MTRRTOMRTLEN; i++) { 23194683Sdwmalone if (i686_mtrrtomrt[i] == MDF_UNKNOWN) 23245405Smsmith continue; 23345405Smsmith if (flags == i686_mtrrtomrt[i]) 23445405Smsmith return(i); 23545405Smsmith } 23645405Smsmith return(-1); 23745405Smsmith} 23845405Smsmith 23994683Sdwmalonestatic int 24094683Sdwmalonei686_mrt2mtrr(int flags, int oldval) 24194683Sdwmalone{ 24294683Sdwmalone int val; 24394683Sdwmalone 24494683Sdwmalone if ((val = i686_mtrrtype(flags)) == -1) 24594683Sdwmalone return oldval & 0xff; 24694683Sdwmalone return val & 0xff; 24794683Sdwmalone} 24894683Sdwmalone 24945405Smsmith/* 25046215Smsmith * Update running CPU(s) MTRRs to match the ranges in the descriptor 25146215Smsmith * list. 25246215Smsmith * 25346215Smsmith * XXX Must be called with interrupts enabled. 25445405Smsmith */ 25548925Smsmithstatic void 25645405Smsmithi686_mrstore(struct mem_range_softc *sc) 25745405Smsmith{ 25845405Smsmith#ifdef SMP 25945405Smsmith /* 26075421Sjhb * We should use ipi_all_but_self() to call other CPUs into a 26145405Smsmith * locking gate, then call a target function to do this work. 26245405Smsmith * The "proper" solution involves a generalised locking gate 26345405Smsmith * implementation, not ready yet. 26445405Smsmith */ 26548925Smsmith smp_rendezvous(NULL, i686_mrstoreone, NULL, (void *)sc); 26648925Smsmith#else 26745405Smsmith disable_intr(); /* disable interrupts */ 26849421Smsmith i686_mrstoreone((void *)sc); 26946215Smsmith enable_intr(); 27048925Smsmith#endif 27146215Smsmith} 27246215Smsmith 27346215Smsmith/* 27446215Smsmith * Update the current CPU's MTRRs with those represented in the 27548925Smsmith * descriptor list. Note that we do this wholesale rather than 27648925Smsmith * just stuffing one entry; this is simpler (but slower, of course). 27746215Smsmith */ 27848925Smsmithstatic void 27948925Smsmithi686_mrstoreone(void *arg) 28046215Smsmith{ 28148925Smsmith struct mem_range_softc *sc = (struct mem_range_softc *)arg; 28246215Smsmith struct mem_range_desc *mrd; 28394683Sdwmalone u_int64_t omsrv, msrv; 28446215Smsmith int i, j, msr; 28546215Smsmith u_int cr4save; 28646215Smsmith 28748925Smsmith mrd = sc->mr_desc; 28846215Smsmith 28945405Smsmith cr4save = rcr4(); /* save cr4 */ 29045405Smsmith if (cr4save & CR4_PGE) 29145405Smsmith load_cr4(cr4save & ~CR4_PGE); 29245405Smsmith load_cr0((rcr0() & ~CR0_NW) | CR0_CD); /* disable caches (CD = 1, NW = 0) */ 29348925Smsmith wbinvd(); /* flush caches, TLBs */ 29445405Smsmith wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) & ~0x800); /* disable MTRRs (E = 0) */ 29545405Smsmith 29645405Smsmith /* Set fixed-range MTRRs */ 29745405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 29845405Smsmith msr = MSR_MTRR64kBase; 29945405Smsmith for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { 30045405Smsmith msrv = 0; 30194683Sdwmalone omsrv = rdmsr(msr); 30245405Smsmith for (j = 7; j >= 0; j--) { 30345405Smsmith msrv = msrv << 8; 30494683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 30545405Smsmith } 30645405Smsmith wrmsr(msr, msrv); 30745405Smsmith mrd += 8; 30845405Smsmith } 30945405Smsmith msr = MSR_MTRR16kBase; 31045405Smsmith for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { 31145405Smsmith msrv = 0; 31294683Sdwmalone omsrv = rdmsr(msr); 31345405Smsmith for (j = 7; j >= 0; j--) { 31445405Smsmith msrv = msrv << 8; 31594683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 31645405Smsmith } 31745405Smsmith wrmsr(msr, msrv); 31845405Smsmith mrd += 8; 31945405Smsmith } 32045405Smsmith msr = MSR_MTRR4kBase; 32145405Smsmith for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { 32245405Smsmith msrv = 0; 32394683Sdwmalone omsrv = rdmsr(msr); 32445405Smsmith for (j = 7; j >= 0; j--) { 32545405Smsmith msrv = msrv << 8; 32694683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 32745405Smsmith } 32845405Smsmith wrmsr(msr, msrv); 32945405Smsmith mrd += 8; 33045405Smsmith } 33145405Smsmith } 33245405Smsmith 33345405Smsmith /* Set remainder which must be variable MTRRs */ 33445405Smsmith msr = MSR_MTRRVarBase; 33545405Smsmith for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { 33645405Smsmith /* base/type register */ 33794683Sdwmalone omsrv = rdmsr(msr); 33845405Smsmith if (mrd->mr_flags & MDF_ACTIVE) { 33945405Smsmith msrv = mrd->mr_base & 0x0000000ffffff000LL; 34094683Sdwmalone msrv |= i686_mrt2mtrr(mrd->mr_flags, omsrv); 34145405Smsmith } else { 34245405Smsmith msrv = 0; 34345405Smsmith } 34445405Smsmith wrmsr(msr, msrv); 34545405Smsmith 34645405Smsmith /* mask/active register */ 34745405Smsmith if (mrd->mr_flags & MDF_ACTIVE) { 34845405Smsmith msrv = 0x800 | (~(mrd->mr_len - 1) & 0x0000000ffffff000LL); 34945405Smsmith } else { 35045405Smsmith msrv = 0; 35145405Smsmith } 35245405Smsmith wrmsr(msr + 1, msrv); 35345405Smsmith } 35448925Smsmith wbinvd(); /* flush caches, TLBs */ 35545405Smsmith wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) | 0x800); /* restore MTRR state */ 35645405Smsmith load_cr0(rcr0() & ~(CR0_CD | CR0_NW)); /* enable caches CD = 0 and NW = 0 */ 35745405Smsmith load_cr4(cr4save); /* restore cr4 */ 35845405Smsmith} 35945405Smsmith 36045405Smsmith/* 36145405Smsmith * Hunt for the fixed MTRR referencing (addr) 36245405Smsmith */ 36345405Smsmithstatic struct mem_range_desc * 36445405Smsmithi686_mtrrfixsearch(struct mem_range_softc *sc, u_int64_t addr) 36545405Smsmith{ 36645405Smsmith struct mem_range_desc *mrd; 36745405Smsmith int i; 36845405Smsmith 36945405Smsmith for (i = 0, mrd = sc->mr_desc; i < (MTRR_N64K + MTRR_N16K + MTRR_N4K); i++, mrd++) 37045405Smsmith if ((addr >= mrd->mr_base) && (addr < (mrd->mr_base + mrd->mr_len))) 37145405Smsmith return(mrd); 37245405Smsmith return(NULL); 37345405Smsmith} 37445405Smsmith 37545405Smsmith/* 37645405Smsmith * Try to satisfy the given range request by manipulating the fixed MTRRs that 37745405Smsmith * cover low memory. 37845405Smsmith * 37945405Smsmith * Note that we try to be generous here; we'll bloat the range out to the 38045405Smsmith * next higher/lower boundary to avoid the consumer having to know too much 38145405Smsmith * about the mechanisms here. 38245405Smsmith * 38345405Smsmith * XXX note that this will have to be updated when we start supporting "busy" ranges. 38445405Smsmith */ 38545405Smsmithstatic int 38645405Smsmithi686_mrsetlow(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 38745405Smsmith{ 38845405Smsmith struct mem_range_desc *first_md, *last_md, *curr_md; 38945405Smsmith 39045405Smsmith /* range check */ 39145405Smsmith if (((first_md = i686_mtrrfixsearch(sc, mrd->mr_base)) == NULL) || 39245405Smsmith ((last_md = i686_mtrrfixsearch(sc, mrd->mr_base + mrd->mr_len - 1)) == NULL)) 39345405Smsmith return(EINVAL); 39445405Smsmith 39545405Smsmith /* set flags, clear set-by-firmware flag */ 39645405Smsmith for (curr_md = first_md; curr_md <= last_md; curr_md++) { 39745405Smsmith curr_md->mr_flags = mrcopyflags(curr_md->mr_flags & ~MDF_FIRMWARE, mrd->mr_flags); 39845405Smsmith bcopy(mrd->mr_owner, curr_md->mr_owner, sizeof(mrd->mr_owner)); 39945405Smsmith } 40045405Smsmith 40145405Smsmith return(0); 40245405Smsmith} 40345405Smsmith 40445405Smsmith 40545405Smsmith/* 40645405Smsmith * Modify/add a variable MTRR to satisfy the request. 40745405Smsmith * 40845405Smsmith * XXX needs to be updated to properly support "busy" ranges. 40945405Smsmith */ 41045405Smsmithstatic int 41145405Smsmithi686_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 41245405Smsmith{ 41345405Smsmith struct mem_range_desc *curr_md, *free_md; 41445405Smsmith int i; 41545405Smsmith 41645405Smsmith /* 41745405Smsmith * Scan the currently active variable descriptors, look for 41845405Smsmith * one we exactly match (straight takeover) and for possible 41945405Smsmith * accidental overlaps. 42045405Smsmith * Keep track of the first empty variable descriptor in case we 42145405Smsmith * can't perform a takeover. 42245405Smsmith */ 42345405Smsmith i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0; 42445405Smsmith curr_md = sc->mr_desc + i; 42545405Smsmith free_md = NULL; 42645405Smsmith for (; i < sc->mr_ndesc; i++, curr_md++) { 42745405Smsmith if (curr_md->mr_flags & MDF_ACTIVE) { 42845405Smsmith /* exact match? */ 42945405Smsmith if ((curr_md->mr_base == mrd->mr_base) && 43045405Smsmith (curr_md->mr_len == mrd->mr_len)) { 43145405Smsmith /* whoops, owned by someone */ 43245405Smsmith if (curr_md->mr_flags & MDF_BUSY) 43345405Smsmith return(EBUSY); 43445405Smsmith /* Ok, just hijack this entry */ 43545405Smsmith free_md = curr_md; 43645405Smsmith break; 43745405Smsmith } 43848925Smsmith /* non-exact overlap ? */ 43948925Smsmith if (mroverlap(curr_md, mrd)) { 44048925Smsmith /* between conflicting region types? */ 44194683Sdwmalone if (i686_mtrrconflict(curr_md->mr_flags, mrd->mr_flags)) 44248925Smsmith return(EINVAL); 44348925Smsmith } 44445405Smsmith } else if (free_md == NULL) { 44545405Smsmith free_md = curr_md; 44645405Smsmith } 44745405Smsmith } 44845405Smsmith /* got somewhere to put it? */ 44945405Smsmith if (free_md == NULL) 45045405Smsmith return(ENOSPC); 45145405Smsmith 45245405Smsmith /* Set up new descriptor */ 45345405Smsmith free_md->mr_base = mrd->mr_base; 45445405Smsmith free_md->mr_len = mrd->mr_len; 45545405Smsmith free_md->mr_flags = mrcopyflags(MDF_ACTIVE, mrd->mr_flags); 45645405Smsmith bcopy(mrd->mr_owner, free_md->mr_owner, sizeof(mrd->mr_owner)); 45745405Smsmith return(0); 45845405Smsmith} 45945405Smsmith 46045405Smsmith/* 46145405Smsmith * Handle requests to set memory range attributes by manipulating MTRRs. 46245405Smsmith * 46345405Smsmith */ 46445405Smsmithstatic int 46545405Smsmithi686_mrset(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 46645405Smsmith{ 46745405Smsmith struct mem_range_desc *targ; 46845405Smsmith int error = 0; 46945405Smsmith 47045405Smsmith switch(*arg) { 47145405Smsmith case MEMRANGE_SET_UPDATE: 47245405Smsmith /* make sure that what's being asked for is even possible at all */ 47345405Smsmith if (!mrvalid(mrd->mr_base, mrd->mr_len) || 47494683Sdwmalone i686_mtrrtype(mrd->mr_flags) == -1) 47545405Smsmith return(EINVAL); 47645405Smsmith 47745405Smsmith#define FIXTOP ((MTRR_N64K * 0x10000) + (MTRR_N16K * 0x4000) + (MTRR_N4K * 0x1000)) 47845405Smsmith 47945405Smsmith /* are the "low memory" conditions applicable? */ 48045405Smsmith if ((sc->mr_cap & MR686_FIXMTRR) && 48145405Smsmith ((mrd->mr_base + mrd->mr_len) <= FIXTOP)) { 48245405Smsmith if ((error = i686_mrsetlow(sc, mrd, arg)) != 0) 48345405Smsmith return(error); 48445405Smsmith } else { 48545405Smsmith /* it's time to play with variable MTRRs */ 48645405Smsmith if ((error = i686_mrsetvariable(sc, mrd, arg)) != 0) 48745405Smsmith return(error); 48845405Smsmith } 48945405Smsmith break; 49045405Smsmith 49145405Smsmith case MEMRANGE_SET_REMOVE: 49245405Smsmith if ((targ = mem_range_match(sc, mrd)) == NULL) 49345405Smsmith return(ENOENT); 49445405Smsmith if (targ->mr_flags & MDF_FIXACTIVE) 49545405Smsmith return(EPERM); 49645405Smsmith if (targ->mr_flags & MDF_BUSY) 49745405Smsmith return(EBUSY); 49845405Smsmith targ->mr_flags &= ~MDF_ACTIVE; 49945405Smsmith targ->mr_owner[0] = 0; 50045405Smsmith break; 50145405Smsmith 50245405Smsmith default: 50345405Smsmith return(EOPNOTSUPP); 50445405Smsmith } 50545405Smsmith 50645405Smsmith /* update the hardware */ 50748925Smsmith i686_mrstore(sc); 50845405Smsmith i686_mrfetch(sc); /* refetch to see where we're at */ 50948925Smsmith return(0); 51045405Smsmith} 51145405Smsmith 51245405Smsmith/* 51345405Smsmith * Work out how many ranges we support, initialise storage for them, 51445405Smsmith * fetch the initial settings. 51545405Smsmith */ 51645405Smsmithstatic void 51745405Smsmithi686_mrinit(struct mem_range_softc *sc) 51845405Smsmith{ 51945405Smsmith struct mem_range_desc *mrd; 52045405Smsmith int nmdesc = 0; 52145405Smsmith int i; 52245405Smsmith 52345405Smsmith mtrrcap = rdmsr(MSR_MTRRcap); 52445405Smsmith mtrrdef = rdmsr(MSR_MTRRdefType); 52545405Smsmith 52645405Smsmith /* For now, bail out if MTRRs are not enabled */ 52745405Smsmith if (!(mtrrdef & 0x800)) { 52845405Smsmith if (bootverbose) 52945405Smsmith printf("CPU supports MTRRs but not enabled\n"); 53045405Smsmith return; 53145405Smsmith } 53245405Smsmith nmdesc = mtrrcap & 0xff; 53348925Smsmith printf("Pentium Pro MTRR support enabled\n"); 53445405Smsmith 53545405Smsmith /* If fixed MTRRs supported and enabled */ 53645405Smsmith if ((mtrrcap & 0x100) && (mtrrdef & 0x400)) { 53745405Smsmith sc->mr_cap = MR686_FIXMTRR; 53845405Smsmith nmdesc += MTRR_N64K + MTRR_N16K + MTRR_N4K; 53945405Smsmith } 54045405Smsmith 54145405Smsmith sc->mr_desc = 54245405Smsmith (struct mem_range_desc *)malloc(nmdesc * sizeof(struct mem_range_desc), 54369781Sdwmalone M_MEMDESC, M_WAITOK | M_ZERO); 54445405Smsmith sc->mr_ndesc = nmdesc; 54545405Smsmith 54645405Smsmith mrd = sc->mr_desc; 54745405Smsmith 54845405Smsmith /* Populate the fixed MTRR entries' base/length */ 54945405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 55045405Smsmith for (i = 0; i < MTRR_N64K; i++, mrd++) { 55145405Smsmith mrd->mr_base = i * 0x10000; 55245405Smsmith mrd->mr_len = 0x10000; 55345405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 55445405Smsmith } 55545405Smsmith for (i = 0; i < MTRR_N16K; i++, mrd++) { 55645405Smsmith mrd->mr_base = i * 0x4000 + 0x80000; 55745405Smsmith mrd->mr_len = 0x4000; 55845405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 55945405Smsmith } 56045405Smsmith for (i = 0; i < MTRR_N4K; i++, mrd++) { 56145405Smsmith mrd->mr_base = i * 0x1000 + 0xc0000; 56245405Smsmith mrd->mr_len = 0x1000; 56345405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 56445405Smsmith } 56545405Smsmith } 56645405Smsmith 56745405Smsmith /* 56845405Smsmith * Get current settings, anything set now is considered to have 56945405Smsmith * been set by the firmware. (XXX has something already played here?) 57045405Smsmith */ 57145405Smsmith i686_mrfetch(sc); 57245405Smsmith mrd = sc->mr_desc; 57345405Smsmith for (i = 0; i < sc->mr_ndesc; i++, mrd++) { 57445405Smsmith if (mrd->mr_flags & MDF_ACTIVE) 57545405Smsmith mrd->mr_flags |= MDF_FIRMWARE; 57645405Smsmith } 57745405Smsmith} 57845405Smsmith 57946215Smsmith/* 58046215Smsmith * Initialise MTRRs on an AP after the BSP has run the init code. 58146215Smsmith */ 58245405Smsmithstatic void 58346215Smsmithi686_mrAPinit(struct mem_range_softc *sc) 58446215Smsmith{ 58548925Smsmith i686_mrstoreone((void *)sc); /* set MTRRs to match BSP */ 58646215Smsmith wrmsr(MSR_MTRRdefType, mtrrdef); /* set MTRR behaviour to match BSP */ 58746215Smsmith} 58846215Smsmith 58946215Smsmithstatic void 59045405Smsmithi686_mem_drvinit(void *unused) 59145405Smsmith{ 59245405Smsmith /* Try for i686 MTRRs */ 59352177Sgreen if ((cpu_feature & CPUID_MTRR) && 59452177Sgreen ((cpu_id & 0xf00) == 0x600) && 59552177Sgreen ((strcmp(cpu_vendor, "GenuineIntel") == 0) || 59652177Sgreen (strcmp(cpu_vendor, "AuthenticAMD") == 0))) { 59745405Smsmith mem_range_softc.mr_op = &i686_mrops; 59845405Smsmith } 59945405Smsmith} 60045405Smsmith 60145405SmsmithSYSINIT(i686memdev,SI_SUB_DRIVERS,SI_ORDER_FIRST,i686_mem_drvinit,NULL) 60245405Smsmith 60345405Smsmith 604