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authorHongjie Yang <hongjie@us.ibm.com>2007-02-05 21:18:24 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 21:18:24 +0100
commitfe355b7f1c7400cbb71762a1237461be03f88265 (patch)
tree8ef581c8ff0889a200bae88a4961395bcb80aec4 /arch/s390/kernel/head64.S
parent1b2782948997cf5a0d1747de13d43ba7dfa7c543 (diff)
[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>
Diffstat (limited to 'arch/s390/kernel/head64.S')
-rw-r--r--arch/s390/kernel/head64.S30
1 files changed, 7 insertions, 23 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index e940e802cb40..030a1c95f47c 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -58,18 +58,11 @@ startup_continue:
stg %r15,__LC_KERNEL_STACK # set end of kernel stack
aghi %r15,-160
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
-
- brasl %r14,ipl_save_parameters
#
-# 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
#
- larl %r2,__bss_start # start of bss segment
- larl %r3,_end # end of bss segment
- sgr %r3,%r2 # length of bss
- sgr %r4,%r4 #
- sgr %r5,%r5 # set src,length and pad to zero
- mvcle %r2,%r4,0 # clear mem
- jo .-4 # branch back, if not finish
+ brasl %r14,startup_init
# set program check new psw mask
mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
larl %r1,.Lslowmemdetect # set program check address
@@ -78,6 +71,10 @@ startup_continue:
diag %r0,%r1,0x260 # get memory size of virtual machine
cgr %r0,%r1 # different? -> old detection routine
jne .Lslowmemdetect
+ larl %r3,ipl_flags
+ llgt %r3,0(%r3)
+ chi %r3,4 # ipled from an kernel NSS
+ je .Lslowmemdetect
aghi %r1,1 # size is one more than end
larl %r2,memory_chunk
stg %r1,8(%r2) # store size of chunk
@@ -226,19 +223,6 @@ startup_continue:
larl %r12,machine_flags
#
-# find out if we are running under VM
-#
- stidp __LC_CPUID # store cpuid
- tm __LC_CPUID,0xff # running under VM ?
- bno 0f-.LPG1(%r13)
- oi 7(%r12),1 # set VM flag
-0: lh %r0,__LC_CPUID+4 # get cpu version
- chi %r0,0x7490 # running on a P/390 ?
- bne 1f-.LPG1(%r13)
- oi 7(%r12),4 # set P/390 flag
-1:
-
-#
# find out if we have the MVPG instruction
#
la %r1,0f-.LPG1(%r13) # set program check address