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Subject[patch v2 06/10] s390: Export store_status() function
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>

For kdump we need a store status function to save the registers for the
current CPU. Therefore this patch exports a function "store_status()".
In addition to that now also floating point registers are saved correctly.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
arch/s390/kernel/reipl64.S | 80 +++++++++++++++++++++++++++++++++------------
1 file changed, 60 insertions(+), 20 deletions(-)

--- a/arch/s390/kernel/reipl64.S
+++ b/arch/s390/kernel/reipl64.S
@@ -1,5 +1,5 @@
/*
- * Copyright IBM Corp 2000,2009
+ * Copyright IBM Corp 2000,2011
* Author(s): Holger Smolinski <Holger.Smolinski@de.ibm.com>,
* Denis Joseph Barrow,
*/
@@ -8,6 +8,64 @@
#include <asm/asm-offsets.h>

#
+# store_status
+#
+# Prerequisites to run this function:
+# - Prefix register is set to zero
+# - Original prefix register is stored in "dump_prefix_page"
+# - Lowcore protection is off
+#
+ENTRY(store_status)
+ /* Save register one and load save area base */
+ stg %r1,__LC_SAVE_AREA_64(%r0)
+ lghi %r1,SAVE_AREA_BASE
+ /* General purpose registers */
+ stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ lg %r2,__LC_SAVE_AREA_64(%r0)
+ stg %r2,__LC_GPREGS_SAVE_AREA-SAVE_AREA_BASE+8(%r1)
+ /* Control registers */
+ stctg %c0,%c15,__LC_CREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Access registers */
+ stam %a0,%a15,__LC_AREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Floating point registers */
+ std %f0, 0x00 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f1, 0x08 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f2, 0x10 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f3, 0x18 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f4, 0x20 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f5, 0x28 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f6, 0x30 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f7, 0x38 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f8, 0x40 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f9, 0x48 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f10,0x50 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f11,0x58 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f12,0x60 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f13,0x68 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f14,0x70 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ std %f15,0x78 + __LC_FPREGS_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Floating point control register */
+ stfpc __LC_FP_CREG_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* CPU timer */
+ stpt __LC_CPU_TIMER_SAVE_AREA-SAVE_AREA_BASE(%r1)
+ /* Saved prefix register */
+ larl %r2,dump_prefix_page
+ mvc __LC_PREFIX_SAVE_AREA-SAVE_AREA_BASE(4,%r1),0(%r2)
+ /* Clock comparator - seven bytes */
+ larl %r2,.Lclkcmp
+ stckc 0(%r2)
+ mvc __LC_CLOCK_COMP_SAVE_AREA-SAVE_AREA_BASE + 1(7,%r1),1(%r2)
+ /* Program status word */
+ epsw %r2,%r3
+ st %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 0(%r1)
+ st %r3,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 4(%r1)
+ larl %r2,store_status
+ stg %r2,__LC_PSW_SAVE_AREA-SAVE_AREA_BASE + 8(%r1)
+ br %r14
+.align 8
+.Lclkcmp: .quad 0x0000000000000000
+
+#
# do_reipl_asm
# Parameter: r2 = schid of reipl device
#
@@ -15,22 +73,7 @@
ENTRY(do_reipl_asm)
basr %r13,0
.Lpg0: lpswe .Lnewpsw-.Lpg0(%r13)
-.Lpg1: # do store status of all registers
-
- stg %r1,.Lregsave-.Lpg0(%r13)
- lghi %r1,0x1000
- stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-0x1000(%r1)
- lg %r0,.Lregsave-.Lpg0(%r13)
- stg %r0,__LC_GPREGS_SAVE_AREA-0x1000+8(%r1)
- stctg %c0,%c15,__LC_CREGS_SAVE_AREA-0x1000(%r1)
- stam %a0,%a15,__LC_AREGS_SAVE_AREA-0x1000(%r1)
- lg %r10,.Ldump_pfx-.Lpg0(%r13)
- mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),0(%r10)
- stfpc __LC_FP_CREG_SAVE_AREA-0x1000(%r1)
- stckc .Lclkcmp-.Lpg0(%r13)
- mvc __LC_CLOCK_COMP_SAVE_AREA-0x1000(7,%r1),.Lclkcmp-.Lpg0(%r13)
- stpt __LC_CPU_TIMER_SAVE_AREA-0x1000(%r1)
- stg %r13, __LC_PSW_SAVE_AREA-0x1000+8(%r1)
+.Lpg1: brasl %r14,store_status

lctlg %c6,%c6,.Lall-.Lpg0(%r13)
lgr %r1,%r2
@@ -67,10 +110,7 @@ ENTRY(do_reipl_asm)
st %r14,.Ldispsw+12-.Lpg0(%r13)
lpswe .Ldispsw-.Lpg0(%r13)
.align 8
-.Lclkcmp: .quad 0x0000000000000000
.Lall: .quad 0x00000000ff000000
-.Ldump_pfx: .quad dump_prefix_page
-.Lregsave: .quad 0x0000000000000000
.align 16
/*
* These addresses have to be 31 bit otherwise


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