| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright IBM Corp. 2007, 2018 |
| */ |
| |
| /* |
| * Early setup functions which may not rely on an initialized bss |
| * section. The last thing that is supposed to happen here is |
| * initialization of the bss section. |
| */ |
| |
| #include <linux/processor.h> |
| #include <linux/string.h> |
| #include <asm/sections.h> |
| #include <asm/lowcore.h> |
| #include <asm/timex.h> |
| #include <asm/kasan.h> |
| #include "entry.h" |
| |
| static void __init reset_tod_clock(void) |
| { |
| u64 time; |
| |
| if (store_tod_clock(&time) == 0) |
| return; |
| /* TOD clock not running. Set the clock to Unix Epoch. */ |
| if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0) |
| disabled_wait(); |
| |
| memset(tod_clock_base, 0, 16); |
| *(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH; |
| S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; |
| } |
| |
| static void __init clear_bss_section(void) |
| { |
| memset(__bss_start, 0, __bss_stop - __bss_start); |
| } |
| |
| void __init startup_init_nobss(void) |
| { |
| reset_tod_clock(); |
| clear_bss_section(); |
| kasan_early_init(); |
| } |