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| author | Mike Loptien <mike.loptien@se-eng.com> | 2014-06-11 14:20:48 -0600 |
|---|---|---|
| committer | Mike Loptien <mike.loptien@se-eng.com> | 2014-06-16 18:14:35 +0200 |
| commit | d0167d3ae268e3fcdef5c02e381b47dbb04ab1a4 (patch) | |
| tree | 265882f5cd1336d324a487d022ed6011e5404506 /src | |
| parent | 915973406544d1d6a60a539ad9fb8a33c3caf2c9 (diff) | |
| download | coreboot-d0167d3ae268e3fcdef5c02e381b47dbb04ab1a4.tar.xz | |
MP Spec: Correct the Virtual Wire assignment
Virtual Wire mode is set by writing 0 to the the MPTable
Feature2 bit field 'IMCR'. The virtualwire variable was
initially defined as writing a 1 to this bit field which
would actually set PIC mode instead of Virtual Wire mode.
However, nearly every mainboard called the MPTables with
virtualwire = 0, which actually had the effect of setting
Virtual Wire mode. I am correcting the definition but
leaving the call to write the MPTables with virtualwire = 0,
which is how most mainboards are already setting the tables
up.
See the MP Spec table 4-1 for more details:
Bit 7: IMCRP. When the IMCR presence bit is
set, the IMCR is present and PIC Mode is
implemented; otherwise, Virtual Wire Mode is
implemented.
http://download.intel.com/design/archives/processors/pro/docs/24201606.pdf
Change-Id: I039d88134aabd55166c2b68aa842bacbfcc0f42b
Signed-off-by: Mike Loptien <mike.loptien@se-eng.com>
Reviewed-on: http://review.coreboot.org/5977
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/x86/boot/mpspec.c | 2 | ||||
| -rw-r--r-- | src/arch/x86/include/arch/smp/mpspec.h | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/src/arch/x86/boot/mpspec.c b/src/arch/x86/boot/mpspec.c index e66535a89e..cd2b142a25 100644 --- a/src/arch/x86/boot/mpspec.c +++ b/src/arch/x86/boot/mpspec.c @@ -89,7 +89,7 @@ static void *smp_write_floating_table_physaddr(unsigned long addr, unsigned long mf->mpf_specification = 4; mf->mpf_checksum = 0; mf->mpf_feature1 = 0; - mf->mpf_feature2 = virtualwire?MP_FEATURE_VIRTUALWIRE:0; + mf->mpf_feature2 = virtualwire?MP_FEATURE_PIC:MP_FEATURE_VIRTUALWIRE; mf->mpf_feature3 = 0; mf->mpf_feature4 = 0; mf->mpf_feature5 = 0; diff --git a/src/arch/x86/include/arch/smp/mpspec.h b/src/arch/x86/include/arch/smp/mpspec.h index fe3ce68011..725718ac25 100644 --- a/src/arch/x86/include/arch/smp/mpspec.h +++ b/src/arch/x86/include/arch/smp/mpspec.h @@ -52,8 +52,8 @@ struct intel_mp_floating unsigned char mpf_checksum; /* Checksum (makes sum 0) */ unsigned char mpf_feature1; /* Standard or configuration ? */ unsigned char mpf_feature2; /* Bit7 set for IMCR|PIC */ -#define MP_FEATURE_VIRTUALWIRE (1 << 7) -#define MP_FEATURE_PIC (0 << 7) +#define MP_FEATURE_VIRTUALWIRE (0 << 7) +#define MP_FEATURE_PIC (1 << 7) unsigned char mpf_feature3; /* Unused (0) */ unsigned char mpf_feature4; /* Unused (0) */ unsigned char mpf_feature5; /* Unused (0) */ |