Initial checkin of toy OS project.HEADmaster

1 files changed, 23 insertions, 0 deletions

diff --git a/kernel/init/entry.asm b/kernel/init/entry.asm
new file mode 100644
index 0000000..afb0434
--- /dev/null
+++ b/kernel/init/entry.asm
@@ -0,0 +1,23 @@
+[BITS 32]
+
+EXTERN KernelEntry
+GLOBAL StartOfKernelImage
+GLOBAL IdleLoop
+                
+;;; 
+;;; I put "entry.o" first in line at the linker so I am sure this function
+;;; gets put first in the kernel image.  This is good because:
+;;;
+;;;     1. We know there is valid code at 0x00010000 when we jump here
+;;;     2. We can use the address of this function as the start of image
+;;;     3. We don't have to make sure main (or KernelEntry or whatever) 
+;;;        is always the first function in main.c
+;;; 
+StartOfKernelImage:
+        jmp KernelEntry
+        ret
+
+IdleLoop:
+        sti
+        hlt
+        jmp IdleLoop