Add bios dumper

2 files changed, 20 insertions, 3 deletions

diff --git a/README b/README
index 604348d..29453f7 100644
--- a/README
+++ b/README
@@ -8,14 +8,15 @@ Building:
 Run make
 
 Running:
-./vbtracetool [-d] [-l] [-g | -p | -s MODENUMBER]
+./vbtracetool [-d] [-l] [-g | -p | -s MODENUMBER | -w]
 
 -d gives trace output *to stderr*. you'll want to redirect that.
 -l gives IO logging *to stderr*. you'll want to redirect that.
 
--g gets the current display mode number
+-g gets the current display mode number (default)
 -p posts the card. could induce several seconds of pants cacking with -d.
 -s sets the given mode number
+-w writes the bios image that would be executed by the other options *to stderr*
 
 ./postandrestore.bash [-d] [-l]
 
diff --git a/vbtracetool.c b/vbtracetool.c
index 8230935..9a1e88b 100644
--- a/vbtracetool.c
+++ b/vbtracetool.c
@@ -89,6 +89,16 @@ int do_post_int(unsigned pci_device)
 	return 0;
 }
 
+int do_writeout_bios(void)
+{
+	int i;
+
+	for (i = 0; i < ((*((char *)0xc0002) * 512 < 0x10000) ? *((char *)0xc0002) * 512 : 0x10000); i++)
+		fprintf(stderr, "%c", *((char *)0xc0000 + i));
+
+	return 0;
+}
+
 int main(int argc, char *argv[])
 {
 	static struct pci_access *pacc;
@@ -97,7 +107,7 @@ int main(int argc, char *argv[])
 	unsigned int pci_id = 0, pci_vendor;
 	int opt, debug = 0, mode, op = 'g', opset = 0, nvlog = 0;
 
-	while ((opt = getopt(argc, argv, "dglps:")) != -1) {
+	while ((opt = getopt(argc, argv, "dglps:w")) != -1) {
 		switch (opt) {
 		case 'd':
 			debug = 1;
@@ -117,6 +127,10 @@ int main(int argc, char *argv[])
 			opset++;
 			mode = atoi(optarg);
 			break;
+		case 'w':
+			op = 'w';
+			opset++;
+			break;
 		default:
 			opset = 2;
 		}
@@ -185,6 +199,8 @@ int main(int argc, char *argv[])
 		return (do_post_int(pci_id));
 	case 's':
 		return (do_set_mode(mode));
+	case 'w':
+		return (do_writeout_bios());
 	}
 
 	return 0;