decode sata capability

Reference: /n/atom/patch/applied/pcisatacap
Date: Sat Jan  4 00:25:57 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/pci/pci.c	Sat Jan  4 00:25:50 2014
+++ /sys/src/cmd/pci/pci.c	Sat Jan  4 00:25:51 2014
@@ -120,6 +120,23 @@
 	Bprint(&o, "\t\t" "pba: offset %.8ux; bar %d\n", u&~7, u&7);
 }
 
+void
+satadump(Pcidev *p, int off)
+{
+	char buf[32];
+	u32int u;
+
+	Bprint(&o, "\t" "sata\n");
+	u = pcicfgr16(p, off + 2);
+	Bprint(&o, "\t\t" "version: %d.%d\n", u>>4 & 0xf, u&0xf);
+	u = pcicfgr32(p, off + 4);
+	if((u & 0xf) == 0xf)
+		snprint(buf, sizeof buf, "pci cfg space");
+	else
+		snprint(buf, sizeof buf, "bar %d", u>>2 & ~3);
+	Bprint(&o, "\t\t" "bar: offset %.8ux; %s\n", u&~0xf, buf);
+}
+
 typedef struct Captab Captab;
 struct Captab {
 	int	id;
@@ -145,7 +162,7 @@
 0x0f,	"secure",		nil,
 0x10,	"pcie",		pciedump,
 0x11,	"msi-x",		msixdump,
-0x12,	"satad/i",		nil,
+0x12,	"satad/i",		satadump,
 0x13,	"advfeat",		nil,
 };