GeneralDrivers.h

src/GeneralDrivers.h

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+/*
+  general driver for simple output and input those drivers are not meant to be used by the kernel 
+  but used for making of more specific drivers like print(); 
+*/ // written by antonio trpeski
+
+
+unsigned char PortIOinByte( unsigned short port ) {
+
+unsigned char data;
+
+__asm__ (" in %% dx , %% al " : "=a " ( data ) : "d " ( port ));
+
+return data;
+
+}
+
+void portIOoutByte( unsigned short port , unsigned char data ) {
+
+__asm__ (" out %% al , %% dx " : :" a" ( data ), "d" ( port ));
+
+}
+
+unsigned short portIOinWord( unsigned short port ) {
+
+unsigned short data;
+
+__asm__ (" in %% dx , %% ax " : "=a " ( data ) : "d " ( port ));
+
+return data;
+
+}
+
+void portIOoutWord( unsigned short port , unsigned short data ) {
+
+__asm__ (" out %% ax , %% dx " : :" a" ( data ), "d" ( port ));
+
+}

src/kernel.asm

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+
+
+
+
+
+
+
+
+
+// section for kernel call (interapts) this will be called
+
+inter:
+  pusha
+  cmp eax,4 ; if it has the value 4 then it will do a sys_out 
+  je print
+
+
+print:
+  mov al,bl ; so the caller will put the char in the bl 
+  int 10h ; call bios (this can be done with the drivers but we need a system to make letters grapichs)..
+