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[BOOT] Multiboot compliant kernel which runs 64 bit code

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This commit is contained in:
Thomas Lovén
2016-07-24 00:45:20 +02:00
parent 1f8d5b3482
commit df86be2973
13 changed files with 433 additions and 4 deletions
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54
kernel/boot/boot_structures.S Normal file
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.intel_syntax noprefix
#include <mem.h>
#include <gdt.h>
// Hardcode the initial page mapping
// Identity map the first GiB of memory
// Also map the same memory at KERNEL_OFFSET
.section .data
.align 0x1000
.global BootP4
BootP4:
.quad V2P(BootP3) + (PAGE_PRESENT | PAGE_WRITE)
.rept P4_OFFSET(KERNEL_OFFSET)-1
.quad 0x0
.endr
.quad V2P(BootP3) + (PAGE_PRESENT | PAGE_WRITE)
.rept 510 - P4_OFFSET(KERNEL_OFFSET) + 1
.quad 0x0
.endr
BootP3:
.quad V2P(BootP2) + (PAGE_PRESENT | PAGE_WRITE)
.rept 511
.quad 0x0
.endr
BootP2:
.set i, 0
.rept 512
.quad (i << 21) + (PAGE_PRESENT | PAGE_WRITE | PAGE_HUGE)
.set i, (i+1)
.endr
// Hardcode initial GDT segments
// Only kernel code (0x8) and data (0x10) for now
.section .rodata
.align 0x1000
.global BootGDT
.global BootGDTp
BootGDT:
.quad 0
.quad (GDT_PRESENT | GDT_CODEDATA | GDT_WRITE | GDT_EXECUTE | GDT_64BIT)
.quad (GDT_PRESENT | GDT_CODEDATA | GDT_WRITE)
BootGDTp: // We can't put the gdt pointer in the gdt, it's too big
.short 3*8-1
.quad V2P(BootGDT)
// Reserved space for the stack
.section .bss
.global BootStack
.align 0x1000
.skip 0x1000
BootStack: