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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 initramfs_data includes the compressed binary that is the
4 filesystem used for early user space.
5 Note: Older versions of "as" (prior to binutils 2.11.90.0.23
6 released on 2001-07-14) dit not support .incbin.
7 If you are forced to use older binutils than that then the
8 following trick can be applied to create the resulting binary:
9
10
11 ld -m elf_i386 --format binary --oformat elf32-i386 -r \
12 -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
Nicholas Pigginf49821e2018-02-11 00:25:04 +100013 ld -m elf_i386 -r -o built-in.a initramfs_data.o
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Hendrik Bruecknerffe80182010-09-17 15:24:11 -070015 For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds.
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17 The above example is for i386 - the parameters vary from architectures.
18 Eventually look up LDFLAGS_BLOB in an older version of the
19 arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.
20
21 Using .incbin has the advantage over ld that the correct flags are set
22 in the ELF header, as required by certain architectures.
23*/
24
Hendrik Brueckner6ae64e42010-09-17 15:24:09 -070025#include <linux/stringify.h>
Hendrik Brueckner1198c6d2010-11-29 14:38:50 -080026#include <asm-generic/vmlinux.lds.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Hendrik Brueckner6ae64e42010-09-17 15:24:09 -070028.section .init.ramfs,"a"
Hendrik Bruecknerffe80182010-09-17 15:24:11 -070029__irf_start:
Hendrik Brueckner6ae64e42010-09-17 15:24:09 -070030.incbin __stringify(INITRAMFS_IMAGE)
Hendrik Bruecknerffe80182010-09-17 15:24:11 -070031__irf_end:
32.section .init.ramfs.info,"a"
Masahiro Yamadac4df32c2018-08-19 07:34:47 +090033.globl __initramfs_size
34__initramfs_size:
Geert Uytterhoeven96f93592010-10-31 10:56:23 +010035#ifdef CONFIG_64BIT
Hendrik Bruecknerffe80182010-09-17 15:24:11 -070036 .quad __irf_end - __irf_start
Geert Uytterhoeven96f93592010-10-31 10:56:23 +010037#else
38 .long __irf_end - __irf_start
Hendrik Bruecknerffe80182010-09-17 15:24:11 -070039#endif