File microcode-select.diff of Package microcode_ctl

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File microcode-select.diff of Package microcode_ctl

diff -uNrp microcode_ctl-1.11.orig/microcode_ctl.c microcode_ctl-1.11/microcode_ctl.c
--- microcode_ctl-1.11.orig/microcode_ctl.c	2004-10-30 01:25:03.000000000 +0200
+++ microcode_ctl-1.11/microcode_ctl.c	2005-02-21 13:52:31.901882546 +0100
@@ -2,7 +2,7 @@
  * microcode_ctl - Manipulate /dev/cpu/microcode under Linux
  *
  * Copyright 2000 (c) Simon Trimmer, Tigran Aivazian.
- *
+ * Minor changes added by Jesus Molina, 2001
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
@@ -23,7 +23,7 @@ int print_error_messages=1;
 
 #define BUFFER_SIZE	4096
 #define MAX_MICROCODE	2000000
-
+#define MICROCODE_SIZE  512
 #define MICROCODE_DEVICE_DEFAULT	"/dev/cpu/microcode"
 #define MICROCODE_FILE_DEFAULT		"/etc/microcode.dat"
 
@@ -32,12 +32,13 @@ static void usage(void)
 	fprintf(stderr, "\nThis program is for updating the microcode on Intel processors\n"
 			"belonging to the IA32 family - PentiumPro upwards (x86_64 included).\n"
 			"It depends on the Linux kernel microcode driver.\n\n"
-			"Usage: %s [-h] [-u] [-q] [-Q] [-f microcode]\n\n"
+			"Usage: %s [-h] [-u] [-q] [-Q] [-s microcode number] [-f microcode]\n\n"
 			"  -h	this usage message\n"
 			"  -q	run silently when successful\n"
 			"  -Q	run silently even on failure\n"
 			"  -u	upload microcode (default filename:\"%s\"\n"
-			"  -f	upload microcode from named Intel formatted file\n\n", 
+			"  -f	upload microcode from named Intel formatted file\n\n" 
+			"  -s	select a specific microcode \n",
 			progname, MICROCODE_FILE_DEFAULT);
 	exit(1);
 }
@@ -48,7 +49,7 @@ static void usage(void)
  *    for the processor.
  * b) send the microcode to the driver which applies the update
  */
-static int do_update(char *device, char *filename)
+static int do_update(char *device, char *filename, int number)
 {
 	FILE *fp;
 	char line_buffer[BUFFER_SIZE];
@@ -56,6 +57,7 @@ static int do_update(char *device, char 
 	int *pos;
 	int outfd;
 	int wrote, length;
+	int *micro;
 
 
 	if( (fp=fopen(filename, "r")) == NULL){
@@ -91,6 +93,19 @@ static int do_update(char *device, char 
 
 	fclose(fp);
 	length = sizeof(int) * (pos - microcode);
+
+	if (number) {
+		length = 2048;
+		number = number-1;
+	}		
+	micro = microcode+512*(number);       /* Select a especific microcode */
+	
+	if (micro >= pos) {
+		if (print_error_messages)
+			fprintf(stderr, "%s: No such microcode in the file provided: Exiting \n", progname);
+ 		return 1;
+	}
+	
 	if(print_normal_messages)
 		fprintf(stderr, "%s: writing microcode (length: %d)\n",  progname, length);
 	
@@ -100,8 +115,8 @@ static int do_update(char *device, char 
 				progname, device, errno, strerror(errno));
 		return errno;
 	}
-
-	if( (wrote = write(outfd, &microcode, length)) < 0){
+	
+	if ( (wrote = write(outfd, micro, length)) < 0) {
 		if(print_error_messages)
 			fprintf(stderr, "%s: error writing to '%s' errno=%d (%s)\n"
 					"%s: there may be messages from the driver in your system log.\n",
@@ -124,7 +139,7 @@ int main(int argc, char *argv[])
 	int c;
 	static char device[2048];
 	static char filename[2048];
-	int upload=0;
+	int upload = 0, number = 0;
 	int return_code;
 
 	progname = argv[0];
@@ -132,7 +147,7 @@ int main(int argc, char *argv[])
 	strcpy(device, MICROCODE_DEVICE_DEFAULT);
 	strcpy(filename, MICROCODE_FILE_DEFAULT);
 	
-	while (EOF != (c = getopt(argc, argv, "hqQud:f:"))) {
+	while (EOF != (c = getopt(argc, argv, "hqQud:f:s:"))) {
 		switch(c) {
 			case 'h':
 				usage();
@@ -158,6 +173,10 @@ int main(int argc, char *argv[])
 				upload++;
 				strcpy(filename, optarg);
 				break;
+			case 's': /* select an especific microcode and upload */
+				upload++;
+				number = atoi(optarg);
+				break;
 
 			case '?':
 				usage();
@@ -165,7 +184,7 @@ int main(int argc, char *argv[])
 	}
 
 	if (upload) {
-		if((return_code = do_update(device, filename)))
+		if ((return_code = do_update(device, filename, number)))
 			exit(return_code);
 	} else
 		usage();

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File microcode-select.diff of Package microcode_ctl

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