Extract generic bitfield decoder into bitfield.[ch]

Signed-off-by: Andi Kleen <ak@linux.intel.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/bitfield.c b/bitfield.c
new file mode 100644
index 0000000..8e1c46b
--- /dev/null
+++ b/bitfield.c
@@ -0,0 +1,47 @@
+#include <string.h>
+#include <stdio.h>
+#include "mcelog.h"
+#include "bitfield.h"
+
+char *reserved_3bits[8];
+char *reserved_1bit[2];
+char *reserved_2bits[4];
+
+static u64 bitmask(u64 i)
+{
+	u64 mask = 1;
+	while (mask < i) 
+		mask = (mask << 1) | 1; 
+	return mask;
+}
+
+void decode_bitfield(u64 status, struct field *fields)
+{
+	struct field *f;
+	int linelen = 0;
+	char *delim = "";
+	
+	for (f = fields; f->str; f++) { 
+		u64 v = (status >> f->start_bit) & bitmask(f->stringlen - 1);
+		char *s = NULL;
+		if (v < f->stringlen)
+			s = f->str[v]; 
+		if (!s) { 
+			if (v == 0) 
+				continue;
+			char buf[60];
+			s = buf; 
+			snprintf(buf, sizeof buf, "<%u:%Lx>", f->start_bit, v);
+		}
+		int len = strlen(s);
+		if (linelen + len > 75) {
+			delim = "\n";
+			linelen = 0;
+		}
+		Wprintf("%s%s", delim, s);
+		delim = " ";
+		linelen += len + 1; 
+	}
+	if (linelen > 0) 
+		Wprintf("\n");
+}