blob: c14322d1c0cfb9d7ad70bf70adce5f77dd8fe921
1 | /* |
2 | initramfs_data includes the compressed binary that is the |
3 | filesystem used for early user space. |
4 | Note: Older versions of "as" (prior to binutils 2.11.90.0.23 |
5 | released on 2001-07-14) dit not support .incbin. |
6 | If you are forced to use older binutils than that then the |
7 | following trick can be applied to create the resulting binary: |
8 | |
9 | |
10 | ld -m elf_i386 --format binary --oformat elf32-i386 -r \ |
11 | -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o |
12 | ld -m elf_i386 -r -o built-in.o initramfs_data.o |
13 | |
14 | For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds. |
15 | |
16 | The above example is for i386 - the parameters vary from architectures. |
17 | Eventually look up LDFLAGS_BLOB in an older version of the |
18 | arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced. |
19 | |
20 | Using .incbin has the advantage over ld that the correct flags are set |
21 | in the ELF header, as required by certain architectures. |
22 | */ |
23 | |
24 | #include <linux/stringify.h> |
25 | #include <asm-generic/vmlinux.lds.h> |
26 | |
27 | .section .init.ramfs,"a" |
28 | __irf_start: |
29 | .incbin __stringify(INITRAMFS_IMAGE) |
30 | __irf_end: |
31 | .section .init.ramfs.info,"a" |
32 | .globl VMLINUX_SYMBOL(__initramfs_size) |
33 | VMLINUX_SYMBOL(__initramfs_size): |
34 | #ifdef CONFIG_64BIT |
35 | .quad __irf_end - __irf_start |
36 | #else |
37 | .long __irf_end - __irf_start |
38 | #endif |
39 |