[PATCH v2 02/12] x86: fixmap: add permanent fixmap for xhci debug port

xHCI compatible USB3 host controller may provide debug capability which enables low-level system debug over USB. In order to probing this debug capability, Linux kernel needs to map and access the mmio of the host controller during early boot. This patch adds permenent fixmap pages in

[PATCH v2 02/12] x86: fixmap: add permanent fixmap for xhci debug port

xHCI compatible USB3 host controller may provide debug capability which enables low-level system debug over USB. In order to probing this debug capability, Linux kernel needs to map and access the mmio of the host controller during early boot. This patch adds permenent fixmap pages in