[S390] fix boot failures with compressed kernels
Fix two bugs with the kernel image compression:
1) reset the bss section of the compressed vmlinux
2) clear the high half of the registers for 64 bit early enough
for the decompression step
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/boot/compressed/misc.c b/arch/s390/boot/compressed/misc.c
index a97d695..14e0479 100644
--- a/arch/s390/boot/compressed/misc.c
+++ b/arch/s390/boot/compressed/misc.c
@@ -24,8 +24,8 @@
/* Symbols defined by linker scripts */
extern char input_data[];
extern int input_len;
-extern int _text;
-extern int _end;
+extern char _text, _end;
+extern char _bss, _ebss;
static void error(char *m);
@@ -129,12 +129,12 @@
unsigned long output_addr;
unsigned char *output;
+ check_ipl_parmblock((void *) 0, (unsigned long) output + SZ__bss_start);
+ memset(&_bss, 0, &_ebss - &_bss);
free_mem_ptr = (unsigned long)&_end;
free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
output = (unsigned char *) ((free_mem_end_ptr + 4095UL) & -4096UL);
- check_ipl_parmblock((void *) 0, (unsigned long) output + SZ__bss_start);
-
#ifdef CONFIG_BLK_DEV_INITRD
/*
* Move the initrd right behind the end of the decompressed
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index ca4a62b..9d1f767 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -517,7 +517,10 @@
lhi %r1,2 # mode 2 = esame (dump)
sigp %r1,%r0,0x12 # switch to esame mode
sam64 # switch to 64 bit mode
+ larl %r13,4f
+ lmh %r0,%r15,0(%r13) # clear high-order half
jg startup_continue
+4: .fill 16,4,0x0
#else
mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0)
l %r13,4f-.LPG0(%r13)
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 39580e7..1f70970 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -21,7 +21,6 @@
larl %r1,sched_clock_base_cc
mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK
larl %r13,.LPG1 # get base
- lmh %r0,%r15,.Lzero64-.LPG1(%r13) # clear high-order half
lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
lg %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
# move IPL device to lowcore
@@ -67,7 +66,6 @@
.L4malign:.quad 0xffffffffffc00000
.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
.Lnop: .long 0x07000700
-.Lzero64:.fill 16,4,0x0
.Lparmaddr:
.quad PARMAREA
.align 64