add support for memory read/write.  recognize
write to port 80, and call cgapost.

Reference: /n/atom/patch/applied2013/acpiomempost
Date: Sat Oct  5 17:04:08 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/acpiio.c	Sat Oct  5 17:03:30 2013
+++ /sys/src/nix/k10/acpiio.c	Sat Oct  5 17:03:31 2013
@@ -12,6 +12,22 @@
 extern int pcibusno(void*);
 
 static int
+readmem(Amlio *io, void *data, int len, int off)
+{
+	memmove(data, io->va + off, len);
+print("aml: readmem: va %#p len %d %llux\n", io->va + off, len, getle(data, len));
+	return len;
+}
+
+static int
+writemem(Amlio *io, void *data, int len, int off)
+{
+	memmove(io->va + off, data, len);
+print("aml: writemem: va %#p len %d\n", io->va + off, len);
+	return len;
+}
+
+static int
 pciaddr(void *dot)
 {
 	int adr, bno;
@@ -103,6 +119,10 @@
 	return i;
 }
 
+enum {
+	Post	= 0x80,
+};
+
 static int
 readioport(Amlio *io, void *data, int len, int port)
 {
@@ -147,6 +167,8 @@
 		return 2;
 	case 1:
 		outb(port, getle(a, 1));
+		if(port == Post)
+			cgapost(*a);
 		return 1;
 	}
 }
@@ -163,10 +185,12 @@
 		print("amlmapio: address space %x not implemented\n", io->space);
 		break;
 	case MemSpace:
-		if((io->va = vmap(io->off, io->len)) == nil){
+		if((io->va = vmapoverlap(io->off, io->len)) == nil){
 			print("amlmapio: vmap failed\n");
 			break;
 		}
+		io->read = readmem;
+		io->write = writemem;
 		return 0;
 	case IoSpace:
 		snprint(buf, sizeof(buf), "%N", io->name);
@@ -200,7 +224,7 @@
 {
 	switch(io->space){
 	case MemSpace:
-		vunmap(io->va, io->len);
+//		vunmap(io->va, io->len);
 		break;
 	case IoSpace:
 		iofree(io->off);