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s390/boot: detect and enable memory facilities 

Detect and enable memory facilities which is a
prerequisite for pgtables setup in the decompressor.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2022-12-04 21:15:41 +01:00 committed by Heiko Carstens
parent b265854060
commit bd50b74362
2 changed files with 26 additions and 0 deletions
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8
arch/s390/boot/boot.h
View File

@ -8,6 +8,12 @@
#ifndef __ASSEMBLY__
struct machine_info {
unsigned char has_edat1 : 1;
unsigned char has_edat2 : 1;
unsigned char has_nx : 1;
};
struct vmlinux_info {
unsigned long default_lma;
void (*entry)(void);
@ -38,6 +44,8 @@ unsigned long get_random_base(unsigned long safe_addr);
void __printf(1, 2) decompressor_printk(const char *fmt, ...);
void error(char *m);
extern struct machine_info machine;
/* Symbols defined by linker scripts */
extern const char kernel_version[];
extern unsigned long memory_limit;

18
arch/s390/boot/startup.c
View File

@ -33,6 +33,8 @@ u64 __bootdata_preserved(stfle_fac_list[16]);
u64 __bootdata_preserved(alt_stfle_fac_list[16]);
struct oldmem_data __bootdata_preserved(oldmem_data);
struct machine_info machine;
void error(char *x)
{
sclp_early_printk("\n\n");
@ -42,6 +44,20 @@ void error(char *x)
disabled_wait();
}
static void detect_facilities(void)
{
if (test_facility(8)) {
machine.has_edat1 = 1;
__ctl_set_bit(0, 23);
}
if (test_facility(78))
machine.has_edat2 = 1;
if (!noexec_disabled && test_facility(130)) {
machine.has_nx = 1;
__ctl_set_bit(0, 20);
}
}
static void setup_lpp(void)
{
S390_lowcore.current_pid = 0;
@ -254,6 +270,8 @@ void startup_kernel(void)
unsigned long safe_addr;
void *img;
detect_facilities();
initrd_data.start = parmarea.initrd_start;
initrd_data.size = parmarea.initrd_size;
oldmem_data.start = parmarea.oldmem_base;