OpenComp-Kernel/start.S at main · misumuse/OpenComp-Kernel · GitHub

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/* start.S - multiboot2 entry for 32-bit mode */

/* Multiboot2 header */
.section .multiboot
.align 8
multiboot2_header_start:
    .long 0xE85250D6                /* magic */
    .long 0                         /* architecture (i386) */
    .long 24                        /* header length (24 bytes total) */
    .long 0x17ADAF12                /* checksum (calculated manually) */

    /* end tag */
    .align 8
    .short 0    /* type */
    .short 0    /* flags */
    .long 8     /* size */
multiboot2_header_end:

/* Start in 32-bit mode */
.section .text
.global _start
.type _start, @function

_start:
    cli
    movl $stack_top, %esp
    cld
    call kernel_main

.hang:
    cli
    hlt
    jmp .hang

/* Stack */
.section .bss
.align 16
stack_bottom:
    .skip 16384
stack_top: