Barrelfish
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x86-64 architecture initialization More...
Macros | |
#define | KERNEL_BOOT_MAGIC 0x33e1f154 |
Magic value passed when kernel is booted by itself (and not bootloader) | |
Functions | |
void | arch_init (uint32_t magic, void *pointer) |
Architecture-specific initialization function. More... | |
void | syscall_entry (void) |
Variables | |
bool | idt_initialized |
x86-64 architecture initialization
void arch_init | ( | uint32_t | magic, |
void * | pointer | ||
) |
Architecture-specific initialization function.
This function is called by the bootup code in boot.S to initialize architecture-specific stuff. It is expected to call the kernel main loop. This function never returns.
The kernel expects one of two magic values in 'magic' that determine how it has been booted. If 'magic' is #MULTIBOOT_INFO_MAGIC the kernel has been booted by a (Multiboot-compliant) bootloader and this is the first image on the boot CPU. It will relocate itself to a default position. If 'magic' is KERNEL_BOOT_MAGIC it has been booted by another image of itself and is running on an (so-called) application CPU. It expects 'dest' to be a physical address pointing to the base of a memory area to relocate itself to.
For x86-64, after performing some sanity checks to the kernel image, this function first copies the whole kernel to a CPU-local version and then calls local_init(), at the offset of the local copy, to initialize that local copy. local_init() should never return.
For bsp kernels, the void pointer is of type multiboot_info, for application CPUs, it is of type global. Global carries a pointer to multiboot_info. Global also contains pointers to memory that is shared between kernels.
magic | Boot magic value |
pointer | Pointer to Multiboot Info or to Global structure |
void syscall_entry | ( | void | ) |
Fast system call entry point (in Assembler).
bool idt_initialized |
This flag is set to true once the IDT is initialized and exceptions can be caught.