diff options
| author | dyson <dyson@FreeBSD.org> | 1997-10-06 02:11:32 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1997-10-06 02:11:32 +0000 |
| commit | a96b1911b8da2ab634bc058d4921b02c3c30f315 (patch) | |
| tree | e84bcdff36e0ec3fa24020afad03a1e3553ce081 /sys/amd64 | |
| parent | 59cc2d40331a440c5510374986d6f949a64a1dab (diff) | |
| download | FreeBSD-src-a96b1911b8da2ab634bc058d4921b02c3c30f315.zip FreeBSD-src-a96b1911b8da2ab634bc058d4921b02c3c30f315.tar.gz | |
It is possible that MB's with really broken bios's not set up more of
the mtrr registers. This just fills in more of the registers.
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/amd64/mp_machdep.c | 8 | ||||
| -rw-r--r-- | sys/amd64/amd64/mptable.c | 8 | ||||
| -rw-r--r-- | sys/amd64/include/mptable.h | 8 |
3 files changed, 24 insertions, 0 deletions
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c index 79ff79d2..2927ace 100644 --- a/sys/amd64/amd64/mp_machdep.c +++ b/sys/amd64/amd64/mp_machdep.c @@ -2036,6 +2036,14 @@ void putfmtrr() { if (cpu_class == CPUCLASS_686) { wbinvd(); + /* + * Set memory between 0-640K to be WB + */ + wrmsr(0x250, 0x0606060606060606LL); + wrmsr(0x258, 0x0606060606060606LL); + /* + * Set normal, PC video memory to be WC + */ wrmsr(0x259, 0x0101010101010101LL); } } diff --git a/sys/amd64/amd64/mptable.c b/sys/amd64/amd64/mptable.c index 79ff79d2..2927ace 100644 --- a/sys/amd64/amd64/mptable.c +++ b/sys/amd64/amd64/mptable.c @@ -2036,6 +2036,14 @@ void putfmtrr() { if (cpu_class == CPUCLASS_686) { wbinvd(); + /* + * Set memory between 0-640K to be WB + */ + wrmsr(0x250, 0x0606060606060606LL); + wrmsr(0x258, 0x0606060606060606LL); + /* + * Set normal, PC video memory to be WC + */ wrmsr(0x259, 0x0101010101010101LL); } } diff --git a/sys/amd64/include/mptable.h b/sys/amd64/include/mptable.h index 79ff79d2..2927ace 100644 --- a/sys/amd64/include/mptable.h +++ b/sys/amd64/include/mptable.h @@ -2036,6 +2036,14 @@ void putfmtrr() { if (cpu_class == CPUCLASS_686) { wbinvd(); + /* + * Set memory between 0-640K to be WB + */ + wrmsr(0x250, 0x0606060606060606LL); + wrmsr(0x258, 0x0606060606060606LL); + /* + * Set normal, PC video memory to be WC + */ wrmsr(0x259, 0x0101010101010101LL); } } |
