memdump: a debugging utility to dump memory over a serial port

A memory-dumping utility which runs in real mode.  Thus, it can be
used to get memory dumps from a relatively pristine system.

1 files changed, 40 insertions, 0 deletions

diff --git a/memdump/io.h b/memdump/io.h
new file mode 100644
index 00000000..a592402f
--- /dev/null
+++ b/memdump/io.h
@@ -0,0 +1,40 @@
+#ifndef IO_H
+#define IO_H
+
+static inline void outb(unsigned char v, unsigned short p)
+{
+  asm volatile("outb %1,%0" : : "d" (p), "a" (v));
+}
+
+static inline unsigned char inb(unsigned short p)
+{
+  unsigned char v;
+  asm volatile("inb %1,%0" : "=a" (v) : "d" (p));
+  return v;
+}
+
+static inline void outw(unsigned short v, unsigned short p)
+{
+  asm volatile("outw %1,%0" : : "d" (p), "a" (v));
+}
+
+static inline unsigned short inw(unsigned short p)
+{
+  unsigned short v;
+  asm volatile("inw %1,%0" : "=a" (v) : "d" (p));
+  return v;
+}
+
+static inline void outl(unsigned int v, unsigned short p)
+{
+  asm volatile("outl %1,%0" : : "d" (p), "a" (v));
+}
+
+static inline unsigned int inl(unsigned short p)
+{
+  unsigned int v;
+  asm volatile("inl %1,%0" : "=a" (v) : "d" (p));
+  return v;
+}
+
+#endif