[S390] boot from NSS support

Add support to boot from a named saved segment (NSS).

Signed-off-by: Hongjie Yang <hongjie@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 28 deletions

diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
index eca507050e47..b3dcdcdc80c0 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -51,20 +51,12 @@ startup_continue:
         st      %r15,__LC_KERNEL_STACK  # set end of kernel stack
         ahi     %r15,-96
         xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
-
-        l       %r14,.Lipl_save_parameters-.LPG1(%r13)
-        basr    %r14,%r14
 #
-# clear bss memory
+# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
+# and create a kernel NSS if the SAVESYS= parm is defined
 #
-        l       %r2,.Lbss_bgn-.LPG1(%r13) # start of bss
-        l       %r3,.Lbss_end-.LPG1(%r13) # end of bss
-        sr      %r3,%r2                 # length of bss
-        sr      %r4,%r4
-        sr      %r5,%r5                 # set src,length and pad to zero
-        sr      %r0,%r0
-        mvcle   %r2,%r4,0               # clear mem
-        jo      .-4                     # branch back, if not finish
+        l       %r14,.Lstartup_init-.LPG1(%r13)
+        basr    %r14,%r14
 
         l       %r2,.Lrcp-.LPG1(%r13)   # Read SCP forced command word
 .Lservicecall:
@@ -125,10 +117,10 @@ startup_continue:
         b       .Lfchunk-.LPG1(%r13)
 
         .align 4
-.Lipl_save_parameters:
-        .long   ipl_save_parameters
 .Linittu:
         .long   init_thread_union
+.Lstartup_init:
+        .long   startup_init
 .Lpmask:
         .byte   0
         .align  8
@@ -207,20 +199,6 @@ startup_continue:
 .Ldonemem:
         l       %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
 #
-# find out if we are running under VM
-#
-        stidp   __LC_CPUID              # store cpuid
-        tm      __LC_CPUID,0xff         # running under VM ?
-        bno     .Lnovm-.LPG1(%r13)
-        oi      3(%r12),1               # set VM flag
-.Lnovm:
-        lh      %r0,__LC_CPUID+4        # get cpu version
-        chi     %r0,0x7490              # running on a P/390 ?
-        bne     .Lnop390-.LPG1(%r13)
-        oi      3(%r12),4               # set P/390 flag
-.Lnop390:
-
-#
 # find out if we have an IEEE fpu
 #
         mvc     __LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13)