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hw_x86_64: Add 64-bit user code and data segments to GDT
The new entries specify a 64-bit code segment with DPL 3 at index 3 and a 64-bit data segment with DPL 3 at index 4. These segments are needed for transitioning to user mode.
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@ -161,6 +161,14 @@
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_TYPE_DATA_A | GDTE_TYPE_DATA_W | GDTE_NON_SYSTEM */
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.long 0x209300
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/* 64-bit user code segment descriptor */
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_CODE | GDTE_NON_SYSTEM */
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.long 0x20f800
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/* 64-bit user data segment descriptor */
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.long 0
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/* GDTE_LONG | GDTE_PRESENT | GDTE_TYPE_DATA_A | GDTE_TYPE_DATA_W | GDTE_NON_SYSTEM */
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.long 0x20f300
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/* Task segment descriptor */
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.long 0
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/* GDTE_PRESENT | GDTE_SYS_TSS */
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