Added initial draft of globals and errno

2026-09-04 16:07:24 +01:00
parent 9dcc182954
commit 4d752ef67c
3 changed files with 46 additions and 0 deletions
@@ -0,0 +1,24 @@
+; Error numbers should be 16 bit ODD numbers, so they can be loaded as immediates
+; and can be checked with:
+;
+;   qcall falible_function
+;   jne falible_ok ; Jump no error
+;       ; handle error
+;   falible_ok:
+;   ; Happy path
+;   ; ...
+; OR
+;   qcall falible_function
+;   je handle_error ; Jump if error
+;   ; Happy path
+;   ; ...
+;   handle_error:
+;       ; handle error
+
+pub const OK                   = 0x0000
+pub const SCREEN_INVALID_MODE  = 0x0001
+pub const SCREEN_INVALID_WIDTH = 0x0003
+pub const SCREEN_FB_TOO_SMALL  = 0x0005
+
+; Extended error codes, these would require loading a 32 bit value.
+pub const EXT_OK              = 0x00000000