From d1b52a4388ffdcff47fb53de7fffe052fe766a9f Mon Sep 17 00:00:00 2001 From: Vasily Gorbik Date: Tue, 10 Apr 2018 14:14:02 +0200 Subject: s390: introduce .boot.data section Introduce .boot.data section which is "shared" between the decompressor code and the decompressed kernel. The decompressor will store values in it, and copy over to the decompressed image before starting it. This method allows to avoid using pre-defined addresses and other hacks to pass values between those boot phases. .boot.data section is a part of init data, and will be freed after kernel initialization is complete. For uncompressed kernel image, .boot.data section is basically the same as .init.data Reviewed-by: Martin Schwidefsky Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/vmlinux.lds.S | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S index 4c5358ff9e05..cc3cbdc93d35 100644 --- a/arch/s390/kernel/vmlinux.lds.S +++ b/arch/s390/kernel/vmlinux.lds.S @@ -16,6 +16,7 @@ #define RO_AFTER_INIT_DATA #include +#include OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390") OUTPUT_ARCH(s390:64-bit) @@ -134,6 +135,8 @@ SECTIONS __nospec_return_end = . ; } + BOOT_DATA + /* early.c uses stsi, which requires page aligned data. */ . = ALIGN(PAGE_SIZE); INIT_DATA_SECTION(0x100) @@ -151,10 +154,12 @@ SECTIONS * it should match struct vmlinux_info */ .vmlinux.info 0 : { - QUAD(_stext) /* default_lma */ - QUAD(startup_continue) /* entry */ - QUAD(__bss_start - _stext) /* image_size */ - QUAD(__bss_stop - __bss_start) /* bss_size */ + QUAD(_stext) /* default_lma */ + QUAD(startup_continue) /* entry */ + QUAD(__bss_start - _stext) /* image_size */ + QUAD(__bss_stop - __bss_start) /* bss_size */ + QUAD(__boot_data_start) /* bootdata_off */ + QUAD(__boot_data_end - __boot_data_start) /* bootdata_size */ } /* Debugging sections. */ -- cgit v1.2.3