AMD Phenom 8450 Triple-Core HD8450WCGHBOX User Manual
Product codes
HD8450WCGHBOX
20
Product Errata
41322
Rev. 3.16 February 2008
Revision Guide for AMD Family 10h Processors
77
Long Mode CALLF or JMPF May Fail To Signal GP When
Callgate Descriptor is Beyond GDT/LDT Limit
Callgate Descriptor is Beyond GDT/LDT Limit
Description
If the target selector of a far call or far jump (CALLF or JMPF) instruction references a 16-byte long
mode system descriptor where any of the last 8 bytes are beyond the GDT or LDT limit, the processor
fails to report a General Protection fault.
mode system descriptor where any of the last 8 bytes are beyond the GDT or LDT limit, the processor
fails to report a General Protection fault.
Potential Effect on System
None expected, since the operating system typically aligns the GDT/LDT limit such that all
descriptors are legal. However, in the case of erroneous operating system code, the above described
GP fault will not be signaled, resulting in unpredictable system failure.
descriptors are legal. However, in the case of erroneous operating system code, the above described
GP fault will not be signaled, resulting in unpredictable system failure.
Suggested Workaround
None required, it is anticipated that long mode operating system code will ensure the GDT and LDT
limits are set high enough to cover the larger (16-byte) long mode system descriptors.
limits are set high enough to cover the larger (16-byte) long mode system descriptors.
Fix Planned
No