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Operating System Development-bios knowledge

Source: Internet
Author: User
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One of the following websites (http://wiki.osdev.org/BIOS)
  • BiOS CILS may use interrupts, which means that you need to forward irqs or map the pic back to its original configuration.
  • BiOS may be used in middleware, that is, after the middleware is used, you need to reset the PIC to the original middleware.
  • BiOS CILS may access devices that you have already configured-notably the pit and PIC
  • The BIOS may access some preset settings, especially pit And pic.
  • BiOS callcan enter protected mode on their own to access mmio registers, which is beyond the limits of virtual 8086 mode.
  • BIOS function data can be imported into the warranty mode (I believe many people think that the BIOS function data can only stay in the actual mode)

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