Refactor kernel-hal#229

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equation314:refactor-kernel-hal

Sep 15, 2021

Commits on Sep 4, 2021

Commits on Sep 5, 2021

Commits on Sep 6, 2021

Commits on Sep 7, 2021

Commits on Sep 9, 2021

Fixed some bugs of vmar::handle_page_fault() & kernel_hal::zero_frame_addr()
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Commits on Sep 10, 2021

kernel-hal: implement page table walking manually for riscv64
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kernel-hal: re-implement GenericPageTable::map_cont() & unmap_cont()
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kernel-hal: pass KERNEL_OFFSET and so on as KernelConfig to kernel_hal
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Commits on Sep 11, 2021

kernel-hal: introduce KernelHandler
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Commits on Sep 12, 2021

kernel-hal: add HAL kernel page fault handler in zCore
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Commits on Sep 13, 2021

kernel-hal: merge commom serial code
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