Check the Linux kernel-general Linux technology-Linux programming and kernel information. For more information, see the following. Finally, I insisted on viewing the Linux kernel. Having understood a lot of things, my doubts have been liberated.
Key points:
1. In the startup phase, switch between several execution environments: real mode-"temporary" protection mode-"formal" protection mode. When switching from the real mode to the temporary protection mode, the key point is to prepare a temporary GDT, which must contain the code segment and data segment, and must contain the linear address space (at this time, there is no paging, that is, the physical address space ).
2. GDT
A descriptor is required, which corresponds to the logical address space and linear address space (the logical address and linear address are the same );
3. BIOS
It can be seen that after entering the kernel code, the original BIOS is basically useless. The interrupt/Exception Handling pointed to by IDT is implemented by kernel-related assembly code or C functions.
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