/*- * Copyright (c) 1999 Michael Smith * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/i386/i386/i686_mem.c,v 1.8.2.4 2002/09/24 08:12:51 mdodd Exp $ * $DragonFly: src/sys/i386/i386/Attic/i686_mem.c,v 1.3 2003/07/06 21:23:48 dillon Exp $ */ #include #include #include #include #include #include #include #ifdef SMP #include #endif #include /* * i686 memory range operations * * This code will probably be impenetrable without reference to the * Intel Pentium Pro documentation. */ static char *mem_owner_bios = "BIOS"; #define MR686_FIXMTRR (1<<0) #define mrwithin(mr, a) \ (((a) >= (mr)->mr_base) && ((a) < ((mr)->mr_base + (mr)->mr_len))) #define mroverlap(mra, mrb) \ (mrwithin(mra, mrb->mr_base) || mrwithin(mrb, mra->mr_base)) #define mrvalid(base, len) \ ((!(base & ((1 << 12) - 1))) && /* base is multiple of 4k */ \ ((len) >= (1 << 12)) && /* length is >= 4k */ \ powerof2((len)) && /* ... and power of two */ \ !((base) & ((len) - 1))) /* range is not discontiuous */ #define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK)) static void i686_mrinit(struct mem_range_softc *sc); static int i686_mrset(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg); static void i686_mrAPinit(struct mem_range_softc *sc); static struct mem_range_ops i686_mrops = { i686_mrinit, i686_mrset, i686_mrAPinit }; /* XXX for AP startup hook */ static u_int64_t mtrrcap, mtrrdef; static struct mem_range_desc *mem_range_match(struct mem_range_softc *sc, struct mem_range_desc *mrd); static void i686_mrfetch(struct mem_range_softc *sc); static int i686_mtrrtype(int flags); static int i686_mrt2mtrr(int flags, int oldval); static int i686_mtrrconflict(int flag1, int flag2); static void i686_mrstore(struct mem_range_softc *sc); static void i686_mrstoreone(void *arg); static struct mem_range_desc *i686_mtrrfixsearch(struct mem_range_softc *sc, u_int64_t addr); static int i686_mrsetlow(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg); static int i686_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg); /* i686 MTRR type to memory range type conversion */ static int i686_mtrrtomrt[] = { MDF_UNCACHEABLE, MDF_WRITECOMBINE, MDF_UNKNOWN, MDF_UNKNOWN, MDF_WRITETHROUGH, MDF_WRITEPROTECT, MDF_WRITEBACK }; #define MTRRTOMRTLEN (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0])) static int i686_mtrr2mrt(int val) { if (val < 0 || val >= MTRRTOMRTLEN) return MDF_UNKNOWN; return i686_mtrrtomrt[val]; } /* * i686 MTRR conflicts. Writeback and uncachable may overlap. */ static int i686_mtrrconflict(int flag1, int flag2) { flag1 &= MDF_ATTRMASK; flag2 &= MDF_ATTRMASK; if (flag1 == flag2 || (flag1 == MDF_WRITEBACK && flag2 == MDF_UNCACHEABLE) || (flag2 == MDF_WRITEBACK && flag1 == MDF_UNCACHEABLE)) return 0; return 1; } /* * Look for an exactly-matching range. */ static struct mem_range_desc * mem_range_match(struct mem_range_softc *sc, struct mem_range_desc *mrd) { struct mem_range_desc *cand; int i; for (i = 0, cand = sc->mr_desc; i < sc->mr_ndesc; i++, cand++) if ((cand->mr_base == mrd->mr_base) && (cand->mr_len == mrd->mr_len)) return(cand); return(NULL); } /* * Fetch the current mtrr settings from the current CPU (assumed to all * be in sync in the SMP case). Note that if we are here, we assume * that MTRRs are enabled, and we may or may not have fixed MTRRs. */ static void i686_mrfetch(struct mem_range_softc *sc) { struct mem_range_desc *mrd; u_int64_t msrv; int i, j, msr; mrd = sc->mr_desc; /* Get fixed-range MTRRs */ if (sc->mr_cap & MR686_FIXMTRR) { msr = MSR_MTRR64kBase; for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { msrv = rdmsr(msr); for (j = 0; j < 8; j++, mrd++) { mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | i686_mtrr2mrt(msrv & 0xff) | MDF_ACTIVE; if (mrd->mr_owner[0] == 0) strcpy(mrd->mr_owner, mem_owner_bios); msrv = msrv >> 8; } } msr = MSR_MTRR16kBase; for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { msrv = rdmsr(msr); for (j = 0; j < 8; j++, mrd++) { mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | i686_mtrr2mrt(msrv & 0xff) | MDF_ACTIVE; if (mrd->mr_owner[0] == 0) strcpy(mrd->mr_owner, mem_owner_bios); msrv = msrv >> 8; } } msr = MSR_MTRR4kBase; for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { msrv = rdmsr(msr); for (j = 0; j < 8; j++, mrd++) { mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | i686_mtrr2mrt(msrv & 0xff) | MDF_ACTIVE; if (mrd->mr_owner[0] == 0) strcpy(mrd->mr_owner, mem_owner_bios); msrv = msrv >> 8; } } } /* Get remainder which must be variable MTRRs */ msr = MSR_MTRRVarBase; for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { msrv = rdmsr(msr); mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | i686_mtrr2mrt(msrv & 0xff); mrd->mr_base = msrv & 0x0000000ffffff000LL; msrv = rdmsr(msr + 1); mrd->mr_flags = (msrv & 0x800) ? (mrd->mr_flags | MDF_ACTIVE) : (mrd->mr_flags & ~MDF_ACTIVE); /* Compute the range from the mask. Ick. */ mrd->mr_len = (~(msrv & 0x0000000ffffff000LL) & 0x0000000fffffffffLL) + 1; if (!mrvalid(mrd->mr_base, mrd->mr_len)) mrd->mr_flags |= MDF_BOGUS; /* If unclaimed and active, must be the BIOS */ if ((mrd->mr_flags & MDF_ACTIVE) && (mrd->mr_owner[0] == 0)) strcpy(mrd->mr_owner, mem_owner_bios); } } /* * Return the MTRR memory type matching a region's flags */ static int i686_mtrrtype(int flags) { int i; flags &= MDF_ATTRMASK; for (i = 0; i < MTRRTOMRTLEN; i++) { if (i686_mtrrtomrt[i] == MDF_UNKNOWN) continue; if (flags == i686_mtrrtomrt[i]) return(i); } return(-1); } static int i686_mrt2mtrr(int flags, int oldval) { int val; if ((val = i686_mtrrtype(flags)) == -1) return oldval & 0xff; return val & 0xff; } /* * Update running CPU(s) MTRRs to match the ranges in the descriptor * list. * * XXX Must be called with interrupts enabled. */ static void i686_mrstore(struct mem_range_softc *sc) { #ifdef SMP /* * We should use all_but_self_ipi() to call other CPUs into a * locking gate, then call a target function to do this work. * The "proper" solution involves a generalised locking gate * implementation, not ready yet. */ smp_rendezvous(NULL, i686_mrstoreone, NULL, (void *)sc); #else mpintr_lock(); /* doesn't have to be mpintr YYY */ i686_mrstoreone((void *)sc); mpintr_unlock(); #endif } /* * Update the current CPU's MTRRs with those represented in the * descriptor list. Note that we do this wholesale rather than * just stuffing one entry; this is simpler (but slower, of course). */ static void i686_mrstoreone(void *arg) { struct mem_range_softc *sc = (struct mem_range_softc *)arg; struct mem_range_desc *mrd; u_int64_t omsrv, msrv; int i, j, msr; u_int cr4save; mrd = sc->mr_desc; cr4save = rcr4(); /* save cr4 */ if (cr4save & CR4_PGE) load_cr4(cr4save & ~CR4_PGE); load_cr0((rcr0() & ~CR0_NW) | CR0_CD); /* disable caches (CD = 1, NW = 0) */ wbinvd(); /* flush caches, TLBs */ wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) & ~0x800); /* disable MTRRs (E = 0) */ /* Set fixed-range MTRRs */ if (sc->mr_cap & MR686_FIXMTRR) { msr = MSR_MTRR64kBase; for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { msrv = 0; omsrv = rdmsr(msr); for (j = 7; j >= 0; j--) { msrv = msrv << 8; msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); } wrmsr(msr, msrv); mrd += 8; } msr = MSR_MTRR16kBase; for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { msrv = 0; omsrv = rdmsr(msr); for (j = 7; j >= 0; j--) { msrv = msrv << 8; msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); } wrmsr(msr, msrv); mrd += 8; } msr = MSR_MTRR4kBase; for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { msrv = 0; omsrv = rdmsr(msr); for (j = 7; j >= 0; j--) { msrv = msrv << 8; msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); } wrmsr(msr, msrv); mrd += 8; } } /* Set remainder which must be variable MTRRs */ msr = MSR_MTRRVarBase; for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { /* base/type register */ omsrv = rdmsr(msr); if (mrd->mr_flags & MDF_ACTIVE) { msrv = mrd->mr_base & 0x0000000ffffff000LL; msrv |= i686_mrt2mtrr(mrd->mr_flags, omsrv); } else { msrv = 0; } wrmsr(msr, msrv); /* mask/active register */ if (mrd->mr_flags & MDF_ACTIVE) { msrv = 0x800 | (~(mrd->mr_len - 1) & 0x0000000ffffff000LL); } else { msrv = 0; } wrmsr(msr + 1, msrv); } wbinvd(); /* flush caches, TLBs */ wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) | 0x800); /* restore MTRR state */ load_cr0(rcr0() & ~(CR0_CD | CR0_NW)); /* enable caches CD = 0 and NW = 0 */ load_cr4(cr4save); /* restore cr4 */ } /* * Hunt for the fixed MTRR referencing (addr) */ static struct mem_range_desc * i686_mtrrfixsearch(struct mem_range_softc *sc, u_int64_t addr) { struct mem_range_desc *mrd; int i; for (i = 0, mrd = sc->mr_desc; i < (MTRR_N64K + MTRR_N16K + MTRR_N4K); i++, mrd++) if ((addr >= mrd->mr_base) && (addr < (mrd->mr_base + mrd->mr_len))) return(mrd); return(NULL); } /* * Try to satisfy the given range request by manipulating the fixed MTRRs that * cover low memory. * * Note that we try to be generous here; we'll bloat the range out to the * next higher/lower boundary to avoid the consumer having to know too much * about the mechanisms here. * * XXX note that this will have to be updated when we start supporting "busy" ranges. */ static int i686_mrsetlow(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) { struct mem_range_desc *first_md, *last_md, *curr_md; /* range check */ if (((first_md = i686_mtrrfixsearch(sc, mrd->mr_base)) == NULL) || ((last_md = i686_mtrrfixsearch(sc, mrd->mr_base + mrd->mr_len - 1)) == NULL)) return(EINVAL); /* check we aren't doing something risky */ if (!(mrd->mr_flags & MDF_FORCE)) for (curr_md = first_md; curr_md <= last_md; curr_md++) { if ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN) return (EACCES); } /* set flags, clear set-by-firmware flag */ for (curr_md = first_md; curr_md <= last_md; curr_md++) { curr_md->mr_flags = mrcopyflags(curr_md->mr_flags & ~MDF_FIRMWARE, mrd->mr_flags); bcopy(mrd->mr_owner, curr_md->mr_owner, sizeof(mrd->mr_owner)); } return(0); } /* * Modify/add a variable MTRR to satisfy the request. * * XXX needs to be updated to properly support "busy" ranges. */ static int i686_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) { struct mem_range_desc *curr_md, *free_md; int i; /* * Scan the currently active variable descriptors, look for * one we exactly match (straight takeover) and for possible * accidental overlaps. * Keep track of the first empty variable descriptor in case we * can't perform a takeover. */ i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0; curr_md = sc->mr_desc + i; free_md = NULL; for (; i < sc->mr_ndesc; i++, curr_md++) { if (curr_md->mr_flags & MDF_ACTIVE) { /* exact match? */ if ((curr_md->mr_base == mrd->mr_base) && (curr_md->mr_len == mrd->mr_len)) { /* whoops, owned by someone */ if (curr_md->mr_flags & MDF_BUSY) return(EBUSY); /* check we aren't doing something risky */ if (!(mrd->mr_flags & MDF_FORCE) && ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN)) return (EACCES); /* Ok, just hijack this entry */ free_md = curr_md; break; } /* non-exact overlap ? */ if (mroverlap(curr_md, mrd)) { /* between conflicting region types? */ if (i686_mtrrconflict(curr_md->mr_flags, mrd->mr_flags)) return(EINVAL); } } else if (free_md == NULL) { free_md = curr_md; } } /* got somewhere to put it? */ if (free_md == NULL) return(ENOSPC); /* Set up new descriptor */ free_md->mr_base = mrd->mr_base; free_md->mr_len = mrd->mr_len; free_md->mr_flags = mrcopyflags(MDF_ACTIVE, mrd->mr_flags); bcopy(mrd->mr_owner, free_md->mr_owner, sizeof(mrd->mr_owner)); return(0); } /* * Handle requests to set memory range attributes by manipulating MTRRs. * */ static int i686_mrset(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) { struct mem_range_desc *targ; int error = 0; switch(*arg) { case MEMRANGE_SET_UPDATE: /* make sure that what's being asked for is even possible at all */ if (!mrvalid(mrd->mr_base, mrd->mr_len) || i686_mtrrtype(mrd->mr_flags) == -1) return(EINVAL); #define FIXTOP ((MTRR_N64K * 0x10000) + (MTRR_N16K * 0x4000) + (MTRR_N4K * 0x1000)) /* are the "low memory" conditions applicable? */ if ((sc->mr_cap & MR686_FIXMTRR) && ((mrd->mr_base + mrd->mr_len) <= FIXTOP)) { if ((error = i686_mrsetlow(sc, mrd, arg)) != 0) return(error); } else { /* it's time to play with variable MTRRs */ if ((error = i686_mrsetvariable(sc, mrd, arg)) != 0) return(error); } break; case MEMRANGE_SET_REMOVE: if ((targ = mem_range_match(sc, mrd)) == NULL) return(ENOENT); if (targ->mr_flags & MDF_FIXACTIVE) return(EPERM); if (targ->mr_flags & MDF_BUSY) return(EBUSY); targ->mr_flags &= ~MDF_ACTIVE; targ->mr_owner[0] = 0; break; default: return(EOPNOTSUPP); } /* update the hardware */ i686_mrstore(sc); i686_mrfetch(sc); /* refetch to see where we're at */ return(0); } /* * Work out how many ranges we support, initialise storage for them, * fetch the initial settings. */ static void i686_mrinit(struct mem_range_softc *sc) { struct mem_range_desc *mrd; int nmdesc = 0; int i; mtrrcap = rdmsr(MSR_MTRRcap); mtrrdef = rdmsr(MSR_MTRRdefType); /* For now, bail out if MTRRs are not enabled */ if (!(mtrrdef & 0x800)) { if (bootverbose) printf("CPU supports MTRRs but not enabled\n"); return; } nmdesc = mtrrcap & 0xff; printf("Pentium Pro MTRR support enabled\n"); /* If fixed MTRRs supported and enabled */ if ((mtrrcap & 0x100) && (mtrrdef & 0x400)) { sc->mr_cap = MR686_FIXMTRR; nmdesc += MTRR_N64K + MTRR_N16K + MTRR_N4K; } sc->mr_desc = (struct mem_range_desc *)malloc(nmdesc * sizeof(struct mem_range_desc), M_MEMDESC, M_WAITOK); bzero(sc->mr_desc, nmdesc * sizeof(struct mem_range_desc)); sc->mr_ndesc = nmdesc; mrd = sc->mr_desc; /* Populate the fixed MTRR entries' base/length */ if (sc->mr_cap & MR686_FIXMTRR) { for (i = 0; i < MTRR_N64K; i++, mrd++) { mrd->mr_base = i * 0x10000; mrd->mr_len = 0x10000; mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; } for (i = 0; i < MTRR_N16K; i++, mrd++) { mrd->mr_base = i * 0x4000 + 0x80000; mrd->mr_len = 0x4000; mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; } for (i = 0; i < MTRR_N4K; i++, mrd++) { mrd->mr_base = i * 0x1000 + 0xc0000; mrd->mr_len = 0x1000; mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; } } /* * Get current settings, anything set now is considered to have * been set by the firmware. (XXX has something already played here?) */ i686_mrfetch(sc); mrd = sc->mr_desc; for (i = 0; i < sc->mr_ndesc; i++, mrd++) { if (mrd->mr_flags & MDF_ACTIVE) mrd->mr_flags |= MDF_FIRMWARE; } } /* * Initialise MTRRs on an AP after the BSP has run the init code. */ static void i686_mrAPinit(struct mem_range_softc *sc) { i686_mrstoreone((void *)sc); /* set MTRRs to match BSP */ wrmsr(MSR_MTRRdefType, mtrrdef); /* set MTRR behaviour to match BSP */ } static void i686_mem_drvinit(void *unused) { /* Try for i686 MTRRs */ if ((cpu_feature & CPUID_MTRR) && ((cpu_id & 0xf00) == 0x600 || (cpu_id & 0xf00) == 0xf00) && ((strcmp(cpu_vendor, "GenuineIntel") == 0) || (strcmp(cpu_vendor, "AuthenticAMD") == 0))) { mem_range_softc.mr_op = &i686_mrops; } } SYSINIT(i686memdev,SI_SUB_DRIVERS,SI_ORDER_FIRST,i686_mem_drvinit,NULL)