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Source document: kernel/boot/bootloader.md
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Bootloader
X86_64
multiboot2
HVM/PVH
HVM/PVH Boot on x86_64
In the DragonOS note segment, there is a PVH header that allows QEMU to boot the DragonOS kernel using the -kernel parameter.
RISC-V 64
DragonOS’s boot process on RISC-V 64 is as follows:
opensbi –> uboot –> DragonStub –> kernel
This boot process decouples the DragonOS kernel from specific hardware boards, enabling the same binary file to boot and run on different hardware boards.
Kernel Boot Callbacks
DragonOS abstracts the kernel bootloader, which is represented by the trait BootCallbacks.
Different bootloaders implement the corresponding callback to initialize the kernel’s bootParams or other data structures.
When the kernel boots, it automatically registers callbacks based on the type of bootloader. And at the appropriate time, it calls these callback functions.