1 files changed, 76 insertions, 0 deletions
diff --git a/src/kernel/stub.asm b/src/kernel/stub.asm
new file mode 100644
index 0000000..2c097d3
--- /dev/null
+++ b/src/kernel/stub.asm
@@ -0,0 +1,76 @@
+;Copyright 2019 Benji Dial
+
+;Permission to use, copy, modify, and/or distribute this
+;software for any purpose with or without fee is hereby
+;granted, provided that the above copyright notice and this
+;permission notice appear in all copies.
+
+;THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS
+;ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+;IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
+;EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+;INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+;RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+;ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+;ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+;OF THIS SOFTWARE.
+
+extern main
+
+section .mb_header
+dd 0xe852_50d6;magic
+dd 0x0000_0000;architecture - i386
+dd mb_end - $$;length
+dd 0x17adaf2a - mb_end + $$;check
+
+;tags
+dw 0x0001;info request
+dw 0x0000;flags
+dd mb_end - $$ - 16
+dd 5;boot device
+dd 6;memory map
+
+mb_end:
+
+section .text
+bits 32
+_start:
+  mov dword [info_pointer], ebx
+  mov esp, stack
+  call main
+  mov edx, eax
+
+  mov eax, 0x20f0_20f0
+  mov ebx, 0x000b_8000
+  mov ecx, 0x000b_8fa0
+clear_screen_loop:
+  mov dword [ebx], eax
+  add ebx, 4
+  test ebx, ecx
+  jne clear_screen_loop
+
+  mov dword [0x000b_8000], 0xf072_f045
+  mov dword [0x000b_8004], 0xf06f_f072
+  mov dword [0x000b_8008], 0xf020_f072
+
+  mov ebx, 0x000b_8022
+error_number_loop:
+  mov al, dl
+  and al, 0x07
+  or al, 0x30
+  mov byte [ebx], al
+  sub ebx, 2
+  shr edx, 3
+  test ebx, 0x000b_800a
+  jne error_number_loop
+
+  cli
+halt:
+  hlt
+  jmp halt
+
+section .bss
+global info_pointer
+info_pointer resd 1
+resb 0x1000 - $ + $$
+stack:
+\ No newline at end of file