diff options
Diffstat (limited to 'arch/s390/kernel/base.S')
| -rw-r--r-- | arch/s390/kernel/base.S | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S index daed3fde4..326f717df 100644 --- a/arch/s390/kernel/base.S +++ b/arch/s390/kernel/base.S @@ -78,15 +78,20 @@ s390_base_pgm_handler_fn: # # Calls diag 308 subcode 1 and continues execution # -# The following conditions must be ensured before calling this function: -# * Prefix register = 0 -# * Lowcore protection is disabled -# ENTRY(diag308_reset) larl %r4,.Lctlregs # Save control registers stctg %c0,%c15,0(%r4) + lg %r2,0(%r4) # Disable lowcore protection + nilh %r2,0xefff + larl %r4,.Lctlreg0 + stg %r2,0(%r4) + lctlg %c0,%c0,0(%r4) larl %r4,.Lfpctl # Floating point control register stfpc 0(%r4) + larl %r4,.Lprefix # Save prefix register + stpx 0(%r4) + larl %r4,.Lprefix_zero # Set prefix register to 0 + spx 0(%r4) larl %r4,.Lcontinue_psw # Save PSW flags epsw %r2,%r3 stm %r2,%r3,0(%r4) @@ -106,6 +111,8 @@ ENTRY(diag308_reset) lctlg %c0,%c15,0(%r4) larl %r4,.Lfpctl # Restore floating point ctl register lfpc 0(%r4) + larl %r4,.Lprefix # Restore prefix register + spx 0(%r4) larl %r4,.Lcontinue_psw # Restore PSW flags lpswe 0(%r4) .Lcontinue: @@ -122,10 +129,16 @@ ENTRY(diag308_reset) .section .bss .align 8 +.Lctlreg0: + .quad 0 .Lctlregs: .rept 16 .quad 0 .endr .Lfpctl: .long 0 +.Lprefix: + .long 0 +.Lprefix_zero: + .long 0 .previous |