porting over pcboot codebase

[com32] / src / macros.inc

diff --git a/src/macros.inc b/src/macros.inc
new file mode 100644 (file)
index 0000000..03613dc
--- /dev/null
+++ b/src/macros.inc
@@ -0,0 +1,30 @@
+UART_BASE      equ 2f8h                ; COM1: 3f8, COM2: 2f8
+UART_DIVISOR   equ 115200 / 9600       ; 9600 baud
+
+%macro WAITKEY 0
+%%waitkey:
+       in al, 64h
+       test al, 1
+       jz %%waitkey
+       in al, 60h
+%endmacro
+
+%macro SER_PUTCHAR 0
+       push dx
+       push ax
+       mov dx, UART_BASE + 5   ; LSTAT
+%%wait:        in al, dx
+       test al, 20h            ; TRIG_EMPTY
+       jz %%wait
+       mov dx, UART_BASE
+       pop ax
+       out dx, al
+       pop dx
+%endmacro
+
+%macro PMPRINT 1
+       mov al, %1
+       SER_PUTCHAR
+%endmacro
+
+; vi:set ts=8 sts=8 sw=8 ft=nasm: