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s390/dump: introduce boot data 'oldmem_data'

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The new boot data struct shall replace global variables OLDMEM_BASE and
OLDMEM_SIZE. It is initialized in the decompressor and passed
to the decompressed kernel. In comparison to the old solution, this one
doesn't access data at fixed physical addresses which will become important
when the decompressor becomes relocatable.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov
2021-06-15 14:25:41 +02:00
committed by Heiko Carstens
parent 84733284f6
commit e9e7870f90
9 changed files with 45 additions and 37 deletions
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4
arch/s390/kernel/smp.c
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@@ -673,7 +673,7 @@ void __init smp_save_dump_cpus(void)
unsigned long page;
bool is_boot_cpu;
if (!(OLDMEM_BASE || is_ipl_type_dump()))
if (!(oldmem_data.start || is_ipl_type_dump()))
/* No previous system present, normal boot. */
return;
/* Allocate a page as dumping area for the store status sigps */
@@ -704,7 +704,7 @@ void __init smp_save_dump_cpus(void)
* these registers an SCLP request is required which is
* done by drivers/s390/char/zcore.c:init_cpu_info()
*/
if (!is_boot_cpu || OLDMEM_BASE)
if (!is_boot_cpu || oldmem_data.start)
/* Get the CPU registers */
smp_save_cpu_regs(sa, addr, is_boot_cpu, page);
}