Global Descriptor Table: Difference between revisions
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* 'L' bit (bit 21, next to 'Sz') is used to indicate x86-64 descriptor |
* 'L' bit (bit 21, next to 'Sz') is used to indicate x86-64 descriptor |
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* 'Sz' bit (bit 22) has to be 0 when the 'L' bit is set, as the combination Sz = 1, L = 1 is reserved for future use (and will throw an exception if you try to use it) |
* 'Sz' bit (bit 22) has to be 0 when the 'L' bit is set, as the combination Sz = 1, L = 1 is reserved for future use (and will throw an exception if you try to use it) |
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The [[LGDT]] instruction will look for a 8-byte base address in long mode. |
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See Figure 3-8, "Segment Descriptor" of the Intel System Programmer's manual. |
See Figure 3-8, "Segment Descriptor" of the Intel System Programmer's manual. |
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