summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--arch/s390/include/asm/ipl.h2
-rw-r--r--arch/s390/kernel/early.c47
-rw-r--r--arch/s390/kernel/ipl.c7
3 files changed, 47 insertions, 9 deletions
diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index 4da22b2f0521..edb5161df7e2 100644
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -97,7 +97,7 @@ void __init save_area_add_vxrs(struct save_area *, __vector128 *vxrs);
extern void do_reipl(void);
extern void do_halt(void);
extern void do_poff(void);
-extern void ipl_save_parameters(void);
+extern void ipl_verify_parameters(void);
extern void ipl_update_parameters(void);
extern size_t append_ipl_vmparm(char *, size_t);
extern size_t append_ipl_scpdata(char *, size_t);
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 9cd85adaa7c1..d038c8cea6cb 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -392,7 +392,49 @@ static int __init cad_init(void)
}
early_initcall(cad_init);
-static __init void rescue_initrd(void)
+static __init void memmove_early(void *dst, const void *src, size_t n)
+{
+ unsigned long addr;
+ long incr;
+ psw_t old;
+
+ if (!n)
+ return;
+ incr = 1;
+ if (dst > src) {
+ incr = -incr;
+ dst += n - 1;
+ src += n - 1;
+ }
+ old = S390_lowcore.program_new_psw;
+ S390_lowcore.program_new_psw.mask = __extract_psw();
+ asm volatile(
+ " larl %[addr],1f\n"
+ " stg %[addr],%[psw_pgm_addr]\n"
+ "0: mvc 0(1,%[dst]),0(%[src])\n"
+ " agr %[dst],%[incr]\n"
+ " agr %[src],%[incr]\n"
+ " brctg %[n],0b\n"
+ "1:\n"
+ : [addr] "=&d" (addr),
+ [psw_pgm_addr] "=&Q" (S390_lowcore.program_new_psw.addr),
+ [dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n)
+ : [incr] "d" (incr)
+ : "cc", "memory");
+ S390_lowcore.program_new_psw = old;
+}
+
+static __init noinline void ipl_save_parameters(void)
+{
+ void *src, *dst;
+
+ src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
+ dst = (void *) IPL_PARMBLOCK_ORIGIN;
+ memmove_early(dst, src, PAGE_SIZE);
+ S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
+}
+
+static __init noinline void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
@@ -406,7 +448,7 @@ static __init void rescue_initrd(void)
return;
if (INITRD_START >= min_initrd_addr)
return;
- memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
+ memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
INITRD_START = min_initrd_addr;
#endif
}
@@ -468,6 +510,7 @@ void __init startup_init(void)
ipl_save_parameters();
rescue_initrd();
clear_bss_section();
+ ipl_verify_parameters();
time_early_init();
init_kernel_storage_key();
lockdep_off();
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 295bfb7124bc..ff3364a067ff 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1991,10 +1991,9 @@ void __init ipl_update_parameters(void)
diag308_set_works = 1;
}
-void __init ipl_save_parameters(void)
+void __init ipl_verify_parameters(void)
{
struct cio_iplinfo iplinfo;
- void *src, *dst;
if (cio_get_iplinfo(&iplinfo))
return;
@@ -2005,10 +2004,6 @@ void __init ipl_save_parameters(void)
if (!iplinfo.is_qdio)
return;
ipl_flags |= IPL_PARMBLOCK_VALID;
- src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
- dst = (void *)IPL_PARMBLOCK_ORIGIN;
- memmove(dst, src, PAGE_SIZE);
- S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
}
static LIST_HEAD(rcall);