[initrd] Move initrd reshuffling to be architecture-independent code

There is nothing x86-specific in initrd.c, and a variant of the
reshuffling logic will be required for executing bare-metal kernels on
RISC-V and AArch64.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/image/bzimage.c

@@ -38,7 +38,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <assert.h>
 #include <realmode.h>
 #include <bzimage.h>
-#include <initrd.h>
+#include <ipxe/initrd.h>
 #include <ipxe/uaccess.h>
 #include <ipxe/image.h>
 #include <ipxe/segment.h>

src/arch/x86/include/bits/errfile.h

@@ -41,7 +41,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #define ERRFILE_comboot_resolv ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00090000 )
 #define ERRFILE_comboot_call   ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x000a0000 )
 #define ERRFILE_sdi	       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x000b0000 )
-#define ERRFILE_initrd	       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x000c0000 )
 #define ERRFILE_pxe_call       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x000d0000 )
 #define ERRFILE_ucode	       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x000e0000 )
 

src/image/initrd.c

@@ -25,12 +25,12 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <string.h>
 #include <errno.h>
-#include <initrd.h>
 #include <ipxe/image.h>
 #include <ipxe/uaccess.h>
 #include <ipxe/init.h>
 #include <ipxe/memmap.h>
 #include <ipxe/cpio.h>
+#include <ipxe/initrd.h>
 
 /** @file
  *

src/include/ipxe/errfile.h

@@ -329,6 +329,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #define ERRFILE_gzip		      ( ERRFILE_IMAGE | 0x000c0000 )
 #define ERRFILE_efi_siglist	      ( ERRFILE_IMAGE | 0x000d0000 )
 #define ERRFILE_lkrn		      ( ERRFILE_IMAGE | 0x000e0000 )
+#define ERRFILE_initrd		      ( ERRFILE_IMAGE | 0x000f0000 )
 
 #define ERRFILE_asn1		      ( ERRFILE_OTHER | 0x00000000 )
 #define ERRFILE_chap		      ( ERRFILE_OTHER | 0x00010000 )

src/include/ipxe/initrd.h

@@ -1,5 +1,5 @@
-#ifndef _INITRD_H
-#define _INITRD_H
+#ifndef _IPXE_INITRD_H
+#define _IPXE_INITRD_H
 
 /** @file
  *
@@ -20,4 +20,4 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 extern void initrd_reshuffle ( physaddr_t bottom );
 extern int initrd_reshuffle_check ( size_t len, physaddr_t bottom );
 
-#endif /* _INITRD_H */
+#endif /* _IPXE_INITRD_H */