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| author | Kartik Agaram <vc@akkartik.com> | 2019-09-14 01:42:29 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-09-14 01:45:55 -0700 |
| commit | 46bb1d3157f9ad575c83a4bfa1e32b0d21bc8546 (patch) | |
| tree | 28918f653d7cf970d33d5592047ef663289aca40 /kernel.soso/boot.asm | |
| parent | ded2b24ce28f4a9df75ce40117f0f06f09574369 (diff) | |
| download | mu-46bb1d3157f9ad575c83a4bfa1e32b0d21bc8546.tar.gz | |
5650 - support a second OS: soso
https://github.com/ozkl/soso + Much smaller than Linux; builds instantly + Supports graphics - No network support - Doesn't work on a cloud server (yet?)
Diffstat (limited to 'kernel.soso/boot.asm')
| -rw-r--r-- | kernel.soso/boot.asm | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel.soso/boot.asm b/kernel.soso/boot.asm new file mode 100644 index 00000000..773dd0f3 --- /dev/null +++ b/kernel.soso/boot.asm @@ -0,0 +1,51 @@ +MBOOT_PAGE_ALIGN equ 1<<0 +MBOOT_MEM_INFO equ 1<<1 +MBOOT_USE_GFX equ 1<<2 +MBOOT_HEADER_MAGIC equ 0x1BADB002 +MBOOT_HEADER_FLAGS equ MBOOT_PAGE_ALIGN | MBOOT_MEM_INFO | MBOOT_USE_GFX +MBOOT_CHECKSUM equ -(MBOOT_HEADER_MAGIC + MBOOT_HEADER_FLAGS) + + +[BITS 32] + + +section .multiboot +align 4 + dd MBOOT_HEADER_MAGIC + dd MBOOT_HEADER_FLAGS + dd MBOOT_CHECKSUM + dd 0x00000000 ; header_addr + dd 0x00000000 ; load_addr + dd 0x00000000 ; load_end_addr + dd 0x00000000 ; bss_end_addr + dd 0x00000000 ; entry_addr + ; Graphics requests + dd 0x00000000 ; 0 = linear graphics + dd 1024 + dd 768 + dd 32 + +section .bss +align 16 +stack_bottom: +resb 16384 ; 16 KiB +stack_top: + +[GLOBAL _start] ; this is the entry point. we tell linker script to set start address of kernel elf file. +[EXTERN kmain] + +section .text + +_start: + mov esp, stack_top + + ; push multiboot parameter to kmain() + push ebx + + ; ...and run! + cli + call kmain + + ;never reach here + cli + hlt |