Bootstrapping
[Intel IA32 (32-bit) Architecture]

Collaboration diagram for Bootstrapping:

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Detailed Description

Zygoma uses a 'multiboot' bootstrapping strategy on the Intel architecture.

Classes
struct	Zygoma::ia32::MultibootHeader
	Header found in the OS image describing the OSs' needs to the bootloader. More...
struct	Zygoma::ia32::LoadModuleDescriptor
	Multiboot Load Module descriptor. More...
struct	Zygoma::ia32::MemoryMapDescriptor
	Multiboot System Memory Map descriptor. More...
struct	Zygoma::ia32::DiskDriveMapDescriptor
	Multiboot Disk Drive Map desriptor. More...
struct	Zygoma::ia32::MultibootInfo
	Structure passed to the OS by the multiboot loader on startup. More...
Variables
static const u32	kMULTIBOOT_HEADER_FLAGS
	The multiboot header flags required to load the Zygoma kernel.
MultibootHeader	gMultibootHeader (".multiboot")
	This is the instance of the multiboot header the kernel supplies to the multiboot loader.

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Variable Documentation

MultibootHeader gMultibootHeader(".multiboot")

Initial value: { MultibootHeader::kMAGIC, kMULTIBOOT_HEADER_FLAGS, -(MultibootHeader::kMAGIC + kMULTIBOOT_HEADER_FLAGS), 0 } This is the instance of the multiboot header the kernel supplies to the multiboot loader. It gets instantiated in its own link section which the linker should explicitly put at or near the begiing of the kernel image, because the multiboot header must be initialized and supplied as early as possible in the first 8192 bytes of the OS image, and must be aligned on a 4-byte bounday.

const u32 kMULTIBOOT_HEADER_FLAGS [static]

Initial value: MultibootHeader::kFLAGS_ALIGN_ON_4K | MultibootHeader::kFLAGS_INCLUDE_MEM_FIELDS The multiboot header flags required to load the Zygoma kernel. Since on an ia32 architecture the Zygoma kernel uses the ELF executable object format, only a minimum of fields are supplied in the multiboot header.

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