From bfca3db41e9af78e56e7a9b7f30121df83b6af0a Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Mon, 17 May 2021 14:57:48 +0100 Subject: [cpio] Split out bzImage initrd CPIO header construction iPXE will construct CPIO headers for images that have a non-empty command line, thereby allowing raw images (without CPIO headers) to be injected into a dynamically constructed initrd. This feature is currently implemented within the BIOS-only bzImage format support. Split out the CPIO header construction logic to allow for reuse in other contexts such as in a UEFI build. Signed-off-by: Michael Brown --- src/include/ipxe/cpio.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'src/include/ipxe') diff --git a/src/include/ipxe/cpio.h b/src/include/ipxe/cpio.h index 0637c531d..9c5e22d5a 100644 --- a/src/include/ipxe/cpio.h +++ b/src/include/ipxe/cpio.h @@ -9,6 +9,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); +#include + /** A CPIO archive header * * All field are hexadecimal ASCII numbers padded with '0' on the @@ -48,6 +50,25 @@ struct cpio_header { /** CPIO magic */ #define CPIO_MAGIC "070701" +/** CPIO header length alignment */ +#define CPIO_ALIGN 4 + +/** Alignment for CPIO archives within an initrd */ +#define INITRD_ALIGN 4096 + +/** + * Get CPIO image name + * + * @v image Image + * @ret name Image name (not NUL terminated) + */ +static inline __attribute__ (( always_inline )) const char * +cpio_name ( struct image *image ) { + return image->cmdline; +} + extern void cpio_set_field ( char *field, unsigned long value ); +extern size_t cpio_name_len ( struct image *image ); +extern size_t cpio_header ( struct image *image, struct cpio_header *cpio ); #endif /* _IPXE_CPIO_H */ -- cgit v1.2.3-55-g7522