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[PATCH 1/4] Generate initrd.addr file correctly for LPAR booting (#546422)



The geninitrdsz.c program was originally provided by IBM.  An old bug
number is referenced in the source.  Apparently this program is not
generating a useful file any more, so IBM has reworked it and it now
generates a load address patch file that can be used when booting an
LPAR directly.
---
 utils/geninitrdsz.c |   51 +++++++++++++++++++++++++++++++++++----------------
 1 files changed, 35 insertions(+), 16 deletions(-)

diff --git a/utils/geninitrdsz.c b/utils/geninitrdsz.c
index 6dfd976..b8c824a 100644
--- a/utils/geninitrdsz.c
+++ b/utils/geninitrdsz.c
@@ -1,11 +1,12 @@
 /*
- * geninitrdsz.c
- * Generate initrd.size file for zSeries platforms.
+ * gen-initrd-addr.c
+ * Generate initrd.addr file for s390x platforms.
  * Takes an integer argument and writes out the binary representation of
- * that value to the initrd.size file.
+ * that value to the initrd.addr file.
  * https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=197773
+ * https://bugzilla.redhat.com/show_bug.cgi?id=546422
  *
- * Copyright (C) 2007  Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2007-2010  Red Hat, Inc.  All rights reserved.
  *
  * 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
@@ -33,27 +34,45 @@
 #include <string.h>
 
 int main(int argc,char **argv) {
-    unsigned int zero = 0;
-    int fd;
-    unsigned int size;
-    mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
+    struct stat initrd_stat;
+    unsigned int addr = 0, size = 0, zero = 0;
+    int fd, rc;
+    char *tmp = NULL;
 
     if (argc != 3) {
-        printf("Usage: %s [integer size] [output file]\n", basename(argv[0]));
-        printf("Example: %s 12288475 initrd.size\n", basename(argv[0]));
-        return 0;
+        printf("Generate initrd.addr file used by the .ins LPAR load mechanism\n");
+        printf("Usage: %s [address] [output file]\n", basename(argv[0]));
+        printf("Example: %s 0x2000000 initrd.size\n", basename(argv[0]));
+        return EXIT_SUCCESS;
     }
 
-    size = htonl(atoi(argv[1]));
-    fd = open(argv[2], O_CREAT | O_RDWR, mode);
+    rc = stat(argv[2], &initrd_stat);
+    if (rc) {
+        perror("Error getting initrd stats ");
+        return rc;
+    }
+
+    addr = htonl(strtoul(argv[1], &tmp, 0));
+    size = initrd_stat.st_size;
+    fd = open(argv[2], O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
+
+    if (write(fd, &zero, sizeof(int)) == -1) {
+        perror("writing initrd.addr (zero) ");
+        return errno;
+    }
+
+    if (write(fd, &addr, sizeof(int)) == -1) {
+        perror("writing initrd.addr (zero) ");
+        return errno;
+    }
 
     if (write(fd, &zero, sizeof(int)) == -1) {
-        perror("writing initrd.size (zero)");
+        perror("writing initrd.addr (zero) ");
         return errno;
     }
 
-    if (write(fd, &size, sizeof(int)) == -1) {
-        perror("writing initrd.size (size)");
+    if (write(fd, &addr, sizeof(int)) == -1) {
+        perror("writing initrd.addr (zero) ");
         return errno;
     }
 
-- 
1.6.6.1


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