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-rw-r--r--sys/arch/i386/i386/i686_mem.c105
1 files changed, 73 insertions, 32 deletions
diff --git a/sys/arch/i386/i386/i686_mem.c b/sys/arch/i386/i386/i686_mem.c
index be862ff0e90..d17d8dcbb2c 100644
--- a/sys/arch/i386/i386/i686_mem.c
+++ b/sys/arch/i386/i386/i686_mem.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: i686_mem.c,v 1.4 2002/03/14 01:26:32 millert Exp $ */
+/* $OpenBSD: i686_mem.c,v 1.5 2002/10/14 21:01:01 matthieu Exp $ */
/*-
* Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
* All rights reserved.
@@ -79,6 +79,9 @@ struct mem_range_desc *mem_range_match(struct mem_range_softc *sc,
struct mem_range_desc *mrd);
void i686_mrfetch(struct mem_range_softc *sc);
int i686_mtrrtype(int flags);
+int i686_mrt2mtrr(int flags, int oldval);
+int i686_mtrr2mrt(int val);
+int i686_mtrrconflict(int flag1, int flag2);
void i686_mrstore(struct mem_range_softc *sc);
void i686_mrstoreone(void *arg);
struct mem_range_desc *i686_mtrrfixsearch(struct mem_range_softc *sc,
@@ -94,29 +97,38 @@ int i686_mrsetvariable(struct mem_range_softc *sc,
int i686_mtrrtomrt[] = {
MDF_UNCACHEABLE,
MDF_WRITECOMBINE,
- 0,
- 0,
+ MDF_UNKNOWN,
+ MDF_UNKNOWN,
MDF_WRITETHROUGH,
MDF_WRITEPROTECT,
MDF_WRITEBACK
};
-/*
- * i686 MTRR conflict matrix for overlapping ranges
- *
- * Specifically, this matrix allows writeback and uncached ranges
- * to overlap (the overlapped region is uncached). The array index
- * is the translated i686 code for the flags (because they map well).
+#define MTRRTOMRTLEN (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0]))
+
+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.
*/
-int i686_mtrrconflict[] = {
- MDF_WRITECOMBINE | MDF_WRITETHROUGH | MDF_WRITEPROTECT,
- MDF_ATTRMASK,
- 0,
- 0,
- MDF_ATTRMASK,
- MDF_ATTRMASK,
- MDF_WRITECOMBINE | MDF_WRITETHROUGH | MDF_WRITEPROTECT
-};
+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.
@@ -158,7 +170,7 @@ i686_mrfetch(sc)
msrv = rdmsr(msr);
for (j = 0; j < 8; j++, mrd++) {
mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
- i686_mtrrtomrt[msrv & 0xff] |
+ i686_mtrr2mrt(msrv & 0xff) |
MDF_ACTIVE;
if (mrd->mr_owner[0] == 0)
strcpy(mrd->mr_owner, mem_owner_bios);
@@ -170,7 +182,7 @@ i686_mrfetch(sc)
msrv = rdmsr(msr);
for (j = 0; j < 8; j++, mrd++) {
mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
- i686_mtrrtomrt[msrv & 0xff] |
+ i686_mtrr2mrt(msrv & 0xff) |
MDF_ACTIVE;
if (mrd->mr_owner[0] == 0)
strcpy(mrd->mr_owner, mem_owner_bios);
@@ -182,7 +194,7 @@ i686_mrfetch(sc)
msrv = rdmsr(msr);
for (j = 0; j < 8; j++, mrd++) {
mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
- i686_mtrrtomrt[msrv & 0xff] |
+ i686_mtrr2mrt(msrv & 0xff) |
MDF_ACTIVE;
if (mrd->mr_owner[0] == 0)
strcpy(mrd->mr_owner, mem_owner_bios);
@@ -196,7 +208,7 @@ i686_mrfetch(sc)
for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) {
msrv = rdmsr(msr);
mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) |
- i686_mtrrtomrt[msrv & 0xff];
+ i686_mtrr2mrt(msrv & 0xff);
mrd->mr_base = msrv & 0x0000000ffffff000LL;
msrv = rdmsr(msr + 1);
mrd->mr_flags = (msrv & 0x800) ?
@@ -223,8 +235,8 @@ i686_mtrrtype(flags)
flags &= MDF_ATTRMASK;
- for (i = 0; i < (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0])); i++) {
- if (i686_mtrrtomrt[i] == 0)
+ for (i = 0; i < MTRRTOMRTLEN; i++) {
+ if (i686_mtrrtomrt[i] == MDF_UNKNOWN)
continue;
if (flags == i686_mtrrtomrt[i])
return(i);
@@ -232,6 +244,16 @@ i686_mtrrtype(flags)
return(-1);
}
+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.
@@ -258,7 +280,7 @@ i686_mrstoreone(arg)
{
struct mem_range_softc *sc = (struct mem_range_softc *)arg;
struct mem_range_desc *mrd;
- u_int64_t msrv;
+ u_int64_t omsrv, msrv;
int i, j, msr;
u_int cr4save;
@@ -276,9 +298,11 @@ i686_mrstoreone(arg)
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_mtrrtype((mrd + j)->mr_flags) & 0xff);
+ msrv |= i686_mrt2mtrr((mrd + j)->mr_flags,
+ omsrv >> (j*8));
}
wrmsr(msr, msrv);
mrd += 8;
@@ -286,9 +310,11 @@ i686_mrstoreone(arg)
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_mtrrtype((mrd + j)->mr_flags) & 0xff);
+ msrv |= i686_mrt2mtrr((mrd + j)->mr_flags,
+ omsrv >> (j*8));
}
wrmsr(msr, msrv);
mrd += 8;
@@ -296,9 +322,11 @@ i686_mrstoreone(arg)
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_mtrrtype((mrd + j)->mr_flags) & 0xff);
+ msrv |= i686_mrt2mtrr((mrd + j)->mr_flags,
+ omsrv >> (j*8));
}
wrmsr(msr, msrv);
mrd += 8;
@@ -309,9 +337,10 @@ i686_mrstoreone(arg)
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_mtrrtype(mrd->mr_flags) & 0xff);
+ msrv |= i686_mrt2mtrr(mrd->mr_flags, omsrv);
} else {
msrv = 0;
}
@@ -371,6 +400,13 @@ i686_mrsetlow(sc, mrd, arg)
((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);
@@ -413,6 +449,11 @@ i686_mrsetvariable(sc, mrd, arg)
/* 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;
@@ -420,8 +461,8 @@ i686_mrsetvariable(sc, mrd, arg)
/* non-exact overlap ? */
if (mroverlap(curr_md, mrd)) {
/* between conflicting region types? */
- if ((i686_mtrrconflict[i686_mtrrtype(curr_md->mr_flags)] & mrd->mr_flags) ||
- (i686_mtrrconflict[i686_mtrrtype(mrd->mr_flags)] & curr_md->mr_flags))
+ if (i686_mtrrconflict(curr_md->mr_flags,
+ mrd->mr_flags))
return(EINVAL);
}
} else if (free_md == NULL) {
@@ -457,7 +498,7 @@ i686_mrset(sc, mrd, 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 & MDF_ATTRMASK) == -1))
+ i686_mtrrtype(mrd->mr_flags) == -1)
return(EINVAL);
#define FIXTOP ((MTRR_N64K * 0x10000) + (MTRR_N16K * 0x4000) + (MTRR_N4K * 0x1000))
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 09:32:31 +0000