separating: there will be libk and libc

kernel/io.s

@@ -0,0 +1,49 @@
+; Raw CPU port I/O kernel module
+; Author: xamidev
+; Licensed under the Unlicense. See the repo below.
+; https://github.com/xamidev/blankos
+
+global outb
+
+outb:
+    mov al, [esp + 8]
+    mov dx, [esp + 4]
+    out dx, al
+    ret
+
+global inb
+
+inb:
+    mov dx, [esp + 4]
+    in al, dx
+    ret
+
+global x86_div64_32
+
+x86_div64_32:
+    push ebp
+    mov ebp, esp
+
+    ; Arguments:
+    ; [ebp + 8]  - lower 32 bits of dividend (uint32_t)
+    ; [ebp + 12] - upper 32 bits of dividend (uint32_t)
+    ; [ebp + 16] - divisor (uint32_t)
+    ; [ebp + 20] - pointer to quotient (uint64_t*)
+    ; [ebp + 24] - pointer to remainder (uint32_t*)
+
+    mov eax, [ebp + 8]
+    mov edx, [ebp + 12]
+
+    mov ecx, [ebp + 16]
+
+    div ecx
+    mov esi, [ebp + 20]
+    mov [esi], eax
+
+    mov dword [esi + 4], 0
+
+    mov esi, [ebp + 24]
+    mov [esi], edx
+
+    pop ebp
+    ret