Rolling Your Own Bootloader: Difference between revisions
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[[Category:Bootloaders]]
[[de:Eigener Bootloader]]
== A list of things you might want to do ==
* Setup 16-bit segment registers and stack
* Print startup message
* Check presence of PCI, CPUID, MSRs
* Enable and confirm enabled A20 line
* Load GDTR
* Inform BIOS of target processor mode
* Get memory map from BIOS
* Locate kernel in filesystem
* Allocate memory to load kernel image
* Load kernel image into buffer
* Enable graphics mode
* Check kernel image ELF headers
* Enable long mode, if 64-bit
* Allocate and map memory for kernel segments
* Setup stack
* Setup COM serial output port
* Setup IDT
* Disable PIC
* Check presence of CPU features (NX, SMEP, x87, PCID, global pages, TCE, WP, MMX, SSE, SYSCALL), and enable them
* Assign a PAT to write combining
* Setup FS/GS base
* Load IDTR
* Enable APIC and setup using information in ACPI tables
* Setup GDT and TSS
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