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s390/head64: Make startup code ready for lowcore relocation

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In preparation of having lowcore at different address than zero,
add the base register to all lowcore accesses in startup_continue().

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-07-22 15:41:15 +02:00 committed by Vasily Gorbik
parent 5ade5be4ed
commit 39e8c5d6a4
1 changed files with 5 additions and 3 deletions
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8
arch/s390/kernel/head64.S
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@ -10,6 +10,7 @@
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/lowcore.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/page.h>
@ -18,14 +19,15 @@
__HEAD
SYM_CODE_START(startup_continue)
larl %r1,tod_clock_base
mvc 0(16,%r1),__LC_BOOT_CLOCK
GET_LC %r2
mvc 0(16,%r1),__LC_BOOT_CLOCK(%r2)
#
# Setup stack
#
larl %r14,init_task
stg %r14,__LC_CURRENT
stg %r14,__LC_CURRENT(%r2)
larl %r15,init_thread_union+STACK_INIT_OFFSET
stg %r15,__LC_KERNEL_STACK
stg %r15,__LC_KERNEL_STACK(%r2)
brasl %r14,sclp_early_adjust_va # allow sclp_early_printk
brasl %r14,startup_init # s390 specific early init
brasl %r14,start_kernel # common init code