add directory Linux-0.98

Linux-0.98/Yggdrasil-0.98.3/usr/include/asm/io.h

@@ -0,0 +1,57 @@
+#ifndef _ASM_IO_H
+#define _ASM_IO_H
+
+/*
+ * Thanks to James van Artsdalen for a better timing-fix than
+ * the two short jumps: using outb's to a nonexistent port seems
+ * to guarantee better timings even on fast machines.
+ *
+ * On the other hand, I'd like to be sure of a non-existent port:
+ * I feel a bit unsafe abou using 0x80.
+ *
+ *		Linus
+ */
+
+#ifdef SLOW_IO_BY_JUMPING
+#define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
+#else
+#define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
+#endif
+
+#ifdef REALLY_SLOW_IO
+#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
+#else
+#define SLOW_DOWN_IO __SLOW_DOWN_IO
+#endif
+
+extern void inline outb(char value, unsigned short port)
+{
+__asm__ __volatile__ ("outb %%al,%%dx"
+		::"a" ((char) value),"d" ((unsigned short) port));
+}
+
+extern unsigned int inline inb(unsigned short port)
+{
+	unsigned int _v;
+__asm__ __volatile__ ("inb %%dx,%%al"
+		:"=a" (_v):"d" ((unsigned short) port),"0" (0));
+	return _v;
+}
+
+extern void inline outb_p(char value, unsigned short port)
+{
+__asm__ __volatile__ ("outb %%al,%%dx"
+		::"a" ((char) value),"d" ((unsigned short) port));
+	SLOW_DOWN_IO;
+}
+
+extern unsigned int inline inb_p(unsigned short port)
+{
+	unsigned int _v;
+__asm__ __volatile__ ("inb %%dx,%%al"
+		:"=a" (_v):"d" ((unsigned short) port),"0" (0));
+	SLOW_DOWN_IO;
+	return _v;
+}
+
+#endif