[commit] r999 - trunk

[repository service]

Author: mkarcher
Date: Tue May 18 01:19:22 2010
New Revision: 999
URL: http://flashrom.org/trac/coreboot/changeset/999

Log:
msr_t memory layout may depend on compiler; with optimizations this
may lead to writing incorrect data to MSR.
Create a temporary buffer with correct layout to avoid this problem.

Signed-off-by: Anti Sullin <[e-mail]>
Acked-by: Michael Karcher <[e-mail]>

Modified:
   trunk/physmap.c

Modified: trunk/physmap.c
==============================================================================
--- trunk/physmap.c	Sat May 15 17:04:37 2010	(r998)
+++ trunk/physmap.c	Tue May 18 01:19:22 2010	(r999)
@@ -282,13 +282,17 @@
 
 int wrmsr(int addr, msr_t msr)
 {
+	uint32_t buf[2];
+	buf[0] = msr.lo;
+	buf[1] = msr.hi;
+
 	if (lseek(fd_msr, (off_t) addr, SEEK_SET) == -1) {
 		perror("Could not lseek() to MSR");
 		close(fd_msr);
 		exit(1);
 	}
 
-	if (write(fd_msr, &msr, 8) != 8 && errno != EIO) {
+	if (write(fd_msr, buf, 8) != 8 && errno != EIO) {
 		perror("Could not write() MSR");
 		close(fd_msr);
 		exit(1);