[PATCH] Add grub_prefix for PowerPC

[Pavel Roskin]

ChangeLog:

        * kern/powerpc/ieee1275/crt0.S: Include grub/symbol.h and
        grub/cpu/kernel.h.  Add start label for consistency with other
        platforms.  Add grub_prefix immediately after start.  Add jump
        to the code after grub_prefix.
        * include/grub/powerpc/kernel.h: Provide valid values for
        GRUB_KERNEL_CPU_PREFIX and GRUB_KERNEL_CPU_DATA_END.

Index: kern/powerpc/ieee1275/crt0.S
===================================================================
--- kern/powerpc/ieee1275/crt0.S        (revision 1832)
+++ kern/powerpc/ieee1275/crt0.S        (working copy)
@@ -17,13 +17,31 @@
  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <grub/symbol.h>
+#include <grub/cpu/kernel.h>
+
 .extern __bss_start
 .extern _end
 
        .text
        .align  2
-       .globl  _start
-_start:        
+       .globl  start, _start
+start:
+_start:
+       b       codestart
+
+       . = EXT_C(start) + GRUB_KERNEL_CPU_PREFIX
+
+VARIABLE(grub_prefix)
+       /* to be filled by grub-mkelfimage */
+
+       /*
+        *  Leave some breathing room for the prefix.
+        */
+
+       . = EXT_C(start) + GRUB_KERNEL_CPU_DATA_END
+
+codestart:
        li      2, 0
        li      13, 0
 
Index: include/grub/powerpc/kernel.h
===================================================================
--- include/grub/powerpc/kernel.h       (revision 1832)
+++ include/grub/powerpc/kernel.h       (working copy)
@@ -26,8 +26,7 @@
    rewrite grub-mkimage to generate valid ELF files.  */
 #define GRUB_MOD_GAP 0x8000
 
-/* prefix not supported on powerpc yet.  */
-#define GRUB_KERNEL_CPU_PREFIX 0
-#define GRUB_KERNEL_CPU_DATA_END       0
+#define GRUB_KERNEL_CPU_PREFIX         0x4
+#define GRUB_KERNEL_CPU_DATA_END       0x44
 
 #endif


-- 
Regards,
Pavel Roskin