very basic vga, ata, serial drivers. start of fat and fs drivers

1 files changed, 37 insertions, 0 deletions

diff --git a/src/kernel/util.asm b/src/kernel/util.asm
new file mode 100644
index 0000000..acac17f
--- /dev/null
+++ b/src/kernel/util.asm
@@ -0,0 +1,37 @@
+bits 32
+
+global outb
+global inb
+global outw
+global inw
+
+section .text
+outb:
+  ;word [esp + 4] = port
+  ;byte [esp + 8] = value
+  mov dx, word [esp + 4]
+  mov al, byte [esp + 8]
+  out dx, al
+  ret
+
+inb:
+  ;word [esp + 4] = port
+  ;al out = value
+  mov dx, word [esp + 4]
+  in al, dx
+  ret
+
+outw:
+  ;word [esp + 4] = port
+  ;word [esp + 8] = value
+  mov dx, word [esp + 4]
+  mov ax, word [esp + 8]
+  out dx, ax
+  ret
+
+inw:
+  ;word [esp + 4] = port
+  ;ax out = value
+  mov dx, word [esp + 4]
+  in ax, dx
+  ret
\ No newline at end of file