make GRUB_LINUX_MAGIC_SIGNATURE architecture-specific

Rename GRUB_LINUX_MAGIC_SIGNATURE GRUB_LINUX_I386_MAGIC_SIGNATURE,
to be usable in code that supports more than one image type.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/commands/file.c

@@ -508,7 +508,7 @@ grub_cmd_file (grub_extcmd_context_t ctxt, int argc, char **args)
 
 	/* FIXME: some really old kernels (< 1.3.73) will fail this.  */
 	if (lh.header !=
-	    grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+	    grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
 	    || grub_le_to_cpu16 (lh.version) < 0x0200)
 	  break;
 
@@ -521,7 +521,7 @@ grub_cmd_file (grub_extcmd_context_t ctxt, int argc, char **args)
 	/* FIXME: 2.03 is not always good enough (Linux 2.4 can be 2.03 and
 	   still not support 32-bit boot.  */
 	if (lh.header !=
-	    grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+	    grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
 	    || grub_le_to_cpu16 (lh.version) < 0x0203)
 	  break;
 

grub-core/loader/i386/linux.c

@@ -721,7 +721,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 
   /* FIXME: 2.03 is not always good enough (Linux 2.4 can be 2.03 and
      still not support 32-bit boot.  */
-  if (lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+  if (lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
       || grub_le_to_cpu16 (lh.version) < 0x0203)
     {
       grub_error (GRUB_ERR_BAD_OS, "version too old for 32-bit boot"

grub-core/loader/i386/pc/linux.c

@@ -169,7 +169,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 
   maximal_cmdline_size = 256;
 
-  if (lh.header == grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+  if (lh.header == grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
       && grub_le_to_cpu16 (lh.version) >= 0x0200)
     {
       grub_linux_is_bzimage = (lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL);
@@ -322,7 +322,7 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
-  if (lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+  if (lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
       || grub_le_to_cpu16 (lh.version) < 0x0200)
     /* Clear the heap space.  */
     grub_memset (grub_linux_real_chunk
@@ -407,7 +407,7 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
 
   lh = (struct linux_kernel_header *) grub_linux_real_chunk;
 
-  if (!(lh->header == grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+  if (!(lh->header == grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
 	&& grub_le_to_cpu16 (lh->version) >= 0x0200))
     {
       grub_error (GRUB_ERR_BAD_OS, "the kernel is too old for initrd");

grub-core/loader/i386/xen_file.c

@@ -43,7 +43,7 @@ grub_xen_file (grub_file_t file)
     goto fail;
 
   if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55)
-      || lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
+      || lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE)
       || grub_le_to_cpu16 (lh.version) < 0x0208)
     {
       grub_error (GRUB_ERR_BAD_OS, "version too old for xen boot");

include/grub/i386/linux.h

@@ -19,7 +19,7 @@
 #ifndef GRUB_I386_LINUX_HEADER
 #define GRUB_I386_LINUX_HEADER	1
 
-#define GRUB_LINUX_MAGIC_SIGNATURE	0x53726448      /* "HdrS" */
+#define GRUB_LINUX_I386_MAGIC_SIGNATURE	0x53726448      /* "HdrS" */
 #define GRUB_LINUX_DEFAULT_SETUP_SECTS	4
 #define GRUB_LINUX_INITRD_MAX_ADDRESS	0x37FFFFFF
 #define GRUB_LINUX_MAX_SETUP_SECTS	64