diff options
| author | Tobias Diedrich <ranma+coreboot@tdiedrich.de> | 2010-11-17 11:02:05 +0000 |
|---|---|---|
| committer | Rudolf Marek <r.marek@assembler.cz> | 2010-11-17 11:02:05 +0000 |
| commit | e0c0a82954978747aa68eceb19709d93a019829d (patch) | |
| tree | 33656345ca40e4bbe96b92b21e1e1be586124975 /src/northbridge/amd/amdk8 | |
| parent | 8a71dcd3212fb438ffd725f4b09fa1bb831ee904 (diff) | |
This problem was introduced with
http://tracker.coreboot.org/trac/coreboot/changeset/3953
Note that all corresponding DSDTs only ever check TOM2 against 0.
Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Acked-by: Rudolf Marek <r.marek@assembler.cz>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6082 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/northbridge/amd/amdk8')
| -rw-r--r-- | src/northbridge/amd/amdk8/amdk8_acpi.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/northbridge/amd/amdk8/amdk8_acpi.c b/src/northbridge/amd/amdk8/amdk8_acpi.c index 712315ee09..c3f0f07d23 100644 --- a/src/northbridge/amd/amdk8/amdk8_acpi.c +++ b/src/northbridge/amd/amdk8/amdk8_acpi.c @@ -270,7 +270,15 @@ int k8acpi_write_vars(void) msr = rdmsr(TOP_MEM); lens += acpigen_write_name_dword("TOM1", msr.lo); msr = rdmsr(TOP_MEM2); - lens += acpigen_write_name_qword("TOM2", (((uint64_t) msr.hi) << 32) | msr.lo); + /* + * Since XP only implements parts of ACPI 2.0, we can't use a qword + * here. + * See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt + * slide 22ff. + * Shift value right by 20 bit to make it fit into 32bit, + * giving us 1MB granularity and a limit of almost 4Exabyte of memory. + */ + lens += acpigen_write_name_dword("TOM2", (msr.hi << 12) | msr.lo >> 20); lens += k8acpi_write_HT(); //minus opcode |