Added common.asm

1 files changed, 22 insertions, 0 deletions

diff --git a/src/common.asm b/src/common.asm
new file mode 100644
index 0000000..7972b75
--- /dev/null
+++ b/src/common.asm
@@ -0,0 +1,22 @@
+    ;; common.asm
+    %ifndef COMMON_ASM
+    %define COMMON_ASM
+
+    ;; Real mode constants
+    %define READ_SECTORS_NUM 1
+    %define BOOT_LOAD_ADDR 0x7c00
+    %define STAGE2_ADDR 0x7e00
+    %define SECTOR_SIZE 512
+    %define STACK_ADDR 0x9c00
+
+    ;; Mostly kernel and protected mode constants
+    %define VGA_COLOR_BLACK 0
+    %define VGA_COLOR_GREEN 2
+    %define VGA_COLOR_RED 4
+    %define VGA_WHITE_ON_BLACK 0x0f20
+    %define VGA_BUFFER 0xb8000
+    %define VGA_SCREEN_X 80
+    %define VGA_SCREEN_Y 25
+    %define VGA_SCREEN (VGA_SCREEN_X*VGA_SCREEN_Y)
+
+    %endif