System boots up and shows a nice ASCII art logo.

1 files changed, 59 insertions, 0 deletions

diff --git a/Source/Kernel/Core/loader.wtf.asm b/Source/Kernel/Core/loader.wtf.asm
new file mode 100644
index 0000000..e5f5839
--- /dev/null
+++ b/Source/Kernel/Core/loader.wtf.asm
@@ -0,0 +1,59 @@
+global loader           ; making entry point visible to linker
+extern kmain            ; kmain is defined elsewhere
+ 
+; setting up the Multiboot header - see GRUB docs for details
+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 required
+ 
+section .text
+align 4
+MultiBootHeader:
+   dd MAGIC
+   dd FLAGS
+   dd CHECKSUM
+ 
+; reserve initial kernel stack space
+STACKSIZE equ 0x4000                  ; that's 16k.
+
+extern start_ctors, end_ctors, start_dtors, end_dtors
+ 
+loader:
+   mov esp, stack+STACKSIZE           ; set up the stack
+   push eax                           ; pass Multiboot magic number
+   push ebx                           ; pass Multiboot info structure
+
+static_ctors_loop:
+   mov ebx, start_ctors
+   jmp .test
+.body:
+   call [ebx]
+   add ebx,4
+.test:
+   cmp ebx, end_ctors
+   jb .body
+ 
+   call  kmain                       ; call kernel proper
+
+   cli
+
+static_dtors_loop:					 ; useless, kernel should never return
+   mov ebx, start_dtors
+   jmp .test
+.body:
+   call [ebx]
+   add ebx,4
+.test:
+   cmp ebx, end_dtors
+   jb .body
+ 
+hang:
+   hlt                                ; halt machine should kernel return
+   jmp   hang
+ 
+section .bss
+align 32
+stack:
+   resb STACKSIZE                     ; reserve 16k stack on a quadword boundary