powerpc: Revert CHRP boot wrapper to real-base = 12MB on 32-bit

Commit 9b09c6d909dfd8de96b99b9b9c808b94b0a71614 ("powerpc: Change the
default link address for pSeries zImage kernels") changed the
real-base value in the CHRP note added by addnote to the zImage from
12MB to 32MB.  It turns out that this causes unnecessary extra reboots
on old 32-bit CHRP machines.  This therefore adds a -r flag to addnote
to allow us to specify what real-base value it should put in the CHRP
note, and adjusts the wrapper script to pass -r c00000 to addnote when
making a zImage for a CHRP machine.  Also, CHRP machines ignore the
RPA note, so we don't need to arrange for it to be the same as the
kernel's.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 31 insertions, 15 deletions

diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
index dcc9ab2ca82..3091d1d21ae 100644
--- a/arch/powerpc/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
@@ -11,7 +11,7 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  *
- * Usage: addnote zImage [note.elf]
+ * Usage: addnote [-r realbase] zImage [note.elf]
  *
  * If note.elf is supplied, it is the name of an ELF file that contains
  * an RPA note to use instead of the built-in one.  Alternatively, the
@@ -153,18 +153,31 @@ unsigned char *read_rpanote(const char *fname, int *nnp)
 int
 main(int ac, char **av)
 {
-        int fd, n, i;
+        int fd, n, i, ai;
         int ph, ps, np;
         int nnote, nnote2, ns;
         unsigned char *rpap;
-
-        if (ac != 2 && ac != 3) {
-                fprintf(stderr, "Usage: %s elf-file [rpanote.elf]\n", av[0]);
+        char *p, *endp;
+
+        ai = 1;
+        if (ac >= ai + 2 && strcmp(av[ai], "-r") == 0) {
+                /* process -r realbase */
+                p = av[ai + 1];
+                descr[1] = strtol(p, &endp, 16);
+                if (endp == p || *endp != 0) {
+                        fprintf(stderr, "Can't parse -r argument '%s' as hex\n",
+                                p);
+                        exit(1);
+                }
+                ai += 2;
+        }
+        if (ac != ai + 1 && ac != ai + 2) {
+                fprintf(stderr, "Usage: %s [-r realbase] elf-file [rpanote.elf]\n", av[0]);
                 exit(1);
         }
-        fd = open(av[1], O_RDWR);
+        fd = open(av[ai], O_RDWR);
         if (fd < 0) {
-                perror(av[1]);
+                perror(av[ai]);
                 exit(1);
         }
 
@@ -184,12 +197,12 @@ main(int ac, char **av)
         if (buf[E_IDENT+EI_CLASS] != ELFCLASS32
             || buf[E_IDENT+EI_DATA] != ELFDATA2MSB) {
                 fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n",
-                        av[1]);
+                        av[ai]);
                 exit(1);
         }
 
-        if (ac == 3)
-                rpap = read_rpanote(av[2], &nnote2);
+        if (ac == ai + 2)
+                rpap = read_rpanote(av[ai + 1], &nnote2);
 
         ph = GET_32BE(buf, E_PHOFF);
         ps = GET_16BE(buf, E_PHENTSIZE);
@@ -202,7 +215,7 @@ main(int ac, char **av)
         for (i = 0; i < np; ++i) {
                 if (GET_32BE(buf, ph + PH_TYPE) == PT_NOTE) {
                         fprintf(stderr, "%s already has a note entry\n",
-                                av[1]);
+                                av[ai]);
                         exit(0);
                 }
                 ph += ps;
@@ -260,18 +273,18 @@ main(int ac, char **av)
                 exit(1);
         }
         if (i < n) {
-                fprintf(stderr, "%s: write truncated\n", av[1]);
+                fprintf(stderr, "%s: write truncated\n", av[ai]);
                 exit(1);
         }
 
         exit(0);
 
  notelf:
-        fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]);
+        fprintf(stderr, "%s does not appear to be an ELF file\n", av[ai]);
         exit(1);
 
  nospace:
         fprintf(stderr, "sorry, I can't find space in %s to put the note\n",
-                av[1]);
+                av[ai]);
         exit(1);
 }
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index ee0dc41d7c5..f39073511a4 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -306,11 +306,14 @@ fi
 
 # post-processing needed for some platforms
 case "$platform" in
-pseries|chrp)
+pseries)
     ${CROSS}objcopy -O binary -j .fakeelf "$kernel" "$ofile".rpanote
     $objbin/addnote "$ofile" "$ofile".rpanote
     rm -r "$ofile".rpanote
     ;;
+chrp)
+    $objbin/addnote -r c00000 "$ofile"
+    ;;
 coff)
     ${CROSS}objcopy -O aixcoff-rs6000 --set-start "$entry" "$ofile"
     $objbin/hack-coff "$ofile"