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- // 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/setup.h>
- #include <asm/timex.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(0);
- 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 rescue_initrd(void)
- {
- unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
- /*
- * Just like in case of IPL from VM reader we make sure there is a
- * gap of 4MB between end of kernel and start of initrd.
- * That way we can also be sure that saving an NSS will succeed,
- * which however only requires different segments.
- */
- if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
- return;
- if (!INITRD_START || !INITRD_SIZE)
- return;
- if (INITRD_START >= min_initrd_addr)
- return;
- memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
- INITRD_START = min_initrd_addr;
- }
- static void __init clear_bss_section(void)
- {
- memset(__bss_start, 0, __bss_stop - __bss_start);
- }
- void __init startup_init_nobss(void)
- {
- reset_tod_clock();
- rescue_initrd();
- clear_bss_section();
- }
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