renamed files to show code vs defs

files that actually include code should be in .nasm files
defines/macros/non-code should be in .inc files

include/util/error_func.nasm

@@ -0,0 +1,63 @@
+; Copyright (c) 2024 Elaina Claus
+;
+; Permission is hereby granted, free of charge, to any person obtaining a copy
+; of this software and associated documentation files (the "Software"), to deal
+; in the Software without restriction, including without limitation the rights
+; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+; copies of the Software, and to permit persons to whom the Software is
+; furnished to do so, subject to the following conditions:
+;
+; The above copyright notice and this permission notice shall be included in all
+; copies or substantial portions of the Software.
+;
+; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+; SOFTWARE.
+
+%ifndef __INC_ERROR_FUNC
+
+%macro ERROR 1
+    xor ax, ax
+    mov al, %1
+    jmp error
+%endmacro
+
+%macro DEBUG_HCF 0
+    DEBUG_LOOP:
+        cli
+        hlt
+        jmp short DEBUG_LOOP
+%endmacro
+
+; pass error as ascii character in al, errors a-zA-Z or 0-9
+ALIGN 4, db 0x90
+error:
+    ; fs = 0xb800 => fs:0x0000 = 0xb8000
+    mov dx, 0xB800
+    mov fs, dx
+
+    mov dx, STEVIA_DEBUG_OK
+    cmp ax, dx
+    jge error.debug_err
+    mov dh, 0x4F                ; color 0x4F is white text/red background
+    jmp error.print
+.debug_err:
+    mov dh, 0x5F                ; debug case is white text/purple background
+
+    ; the characters are two bytes in the order of 0xb8000: byte c, byte attribute
+    ; since x86 is le, we store the attribute in the MSB of dx
+.print:
+    mov dl, al
+    mov word [fs:0x0000], dx
+    jmp error.stop
+
+.stop:
+    hlt
+    jmp short error.stop
+
+%endif
+%define __INC_ERROR_FUNC