Make IO helpers inline and use immediate-encoded ports when possible.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/05565bad580

Kernel/IO.cpp

@@ -1,41 +0,0 @@
-#include "IO.h"
-
-namespace IO {
-
-BYTE in8(WORD port)
-{
-    BYTE value;
-    asm("inb %%dx, %%al":"=a"(value):"d"(port));
-    return value;
-}
-
-WORD in16(WORD port)
-{
-    WORD value;
-    asm("inw %%dx, %%ax":"=a"(value):"d"(port));
-    return value;
-}
-
-DWORD in32(DWORD port)
-{
-    DWORD value;
-    asm("inl %%dx, %%eax":"=a"(value):"d"(port));
-    return value;
-}
-
-void out8(WORD port, BYTE value)
-{
-    asm("outb %%al, %%dx"::"d"(port), "a"(value));
-}
-
-void out16(WORD port, WORD value)
-{
-    asm("outw %%ax, %%dx"::"d"(port), "a"(value));
-}
-
-void out32(WORD port, WORD value)
-{
-    asm("outl %%eax, %%dx"::"d"(port), "a"(value));
-}
-
-}

Kernel/IO.h

@@ -4,12 +4,39 @@
 
 namespace IO {
 
-BYTE in8(WORD port);
-WORD in16(WORD port);
-DWORD in32(WORD port);
-
-void out8(WORD port, BYTE data);
-void out16(WORD port, WORD data);
-void out32(WORD port, DWORD data);
-
+inline byte in8(word port)
+{
+    byte value;
+    asm volatile("inb %1, %0":"=a"(value):"Nd"(port));
+    return value;
+}
+
+inline word in16(word port)
+{
+    word value;
+    asm volatile("inw %1, %0":"=a"(value):"Nd"(port));
+    return value;
+}
+
+inline dword in32(dword port)
+{
+    dword value;
+    asm volatile("inl %1, %0":"=a"(value):"Nd"(port));
+    return value;
+}
+
+inline void out8(word port, byte value)
+{
+    asm volatile("outb %0, %1"::"a"(value), "Nd"(port));
+}
+
+inline void out16(word port, word value)
+{
+    asm volatile("outw %0, %1"::"a"(value), "Nd"(port));
+}
+
+inline void out32(word port, dword value)
+{
+    asm volatile("outl %0, %1"::"a"(value), "Nd"(port));
+}
 }

Kernel/Makefile

@@ -9,7 +9,6 @@ KERNEL_OBJS = \
        i8253.o \
        Keyboard.o \
        CMOS.o \
-       IO.o \
        PIC.o \
        Syscall.o \
        Disk.o \