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| author | Jérémy Zurcher <jeremy@asynk.ch> | 2015-11-03 00:15:58 +0100 |
|---|---|---|
| committer | Jérémy Zurcher <jeremy@asynk.ch> | 2015-11-03 00:15:58 +0100 |
| commit | a71fe5ed5d709ef0a3caefb744a99c575fb9dd29 (patch) | |
| tree | 9a33e76614e7f51a4c255d8b59068e1dd289b35c /kernel/entry.asm | |
| download | jeyzuos-a71fe5ed5d709ef0a3caefb744a99c575fb9dd29.zip jeyzuos-a71fe5ed5d709ef0a3caefb744a99c575fb9dd29.tar.gz | |
initial commit
Diffstat (limited to 'kernel/entry.asm')
| -rw-r--r-- | kernel/entry.asm | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/kernel/entry.asm b/kernel/entry.asm new file mode 100644 index 0000000..28e491a --- /dev/null +++ b/kernel/entry.asm @@ -0,0 +1,43 @@ +global _start +global stack_ptr + +extern kernel_main + +; declare some constants +MODULEALIGN equ 1<<0 ; align loaded modules on page boundaries +MEMINFO equ 1<<1 ; provide memory map +FLAGS equ MODULEALIGN | MEMINFO ; this is the Multiboot 'flag' field +MAGIC equ 0x1BADB002 ; 'magic number' lets bootloader find the header +CHECKSUM equ -(MAGIC + FLAGS) ; checksum of above, to prove we are multiboot + +; the bootloader will search for this magic sequence +; and recognize us as a multiboot kernel +section .multiboot +align 4 +MultiBootHeader: + dd MAGIC + dd FLAGS + dd CHECKSUM + +section .code +; setup the stack +STACKSIZE equ 0x16384 + +_start: + mov esp, stack+STACKSIZE + push eax + push ebx + + call kernel_main + + cli + +hang: + hlt + jmp hang + +section .bss +align 4 +stack: + resb STACKSIZE +stack_ptr: |