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-rw-r--r--arch/s390/kernel/head64.S66
1 files changed, 64 insertions, 2 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index c9ff040..193aafa 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -484,6 +484,8 @@ start:
startup:basr %r13,0 # get base
.LPG1: sll %r13,1 # remove high order bit
srl %r13,1
+ l %r1,.Lget_ipl_device_addr-.LPG1(%r13)
+ basr %r14,%r1
lhi %r1,1 # mode 1 = esame
slr %r0,%r0 # set cpuid to zero
sigp %r1,%r0,0x12 # switch to esame mode
@@ -556,6 +558,9 @@ startup:basr %r13,0 # get base
mlgr %r2,%r1 # mem size in bytes in %r3
b .Lfchunk-.LPG1(%r13)
+ .align 4
+.Lget_ipl_device_addr:
+ .long .Lget_ipl_device
.Lpmask:
.byte 0
.align 8
@@ -746,6 +751,63 @@ _pstart:
.global _pend
_pend:
+.Lget_ipl_device:
+ basr %r12,0
+.LPG2: l %r1,0xb8 # get sid
+ sll %r1,15 # test if subchannel is enabled
+ srl %r1,31
+ ltr %r1,%r1
+ bz 0(%r14) # subchannel disabled
+ l %r1,0xb8
+ la %r5,.Lipl_schib-.LPG2(%r12)
+ stsch 0(%r5) # get schib of subchannel
+ bnz 0(%r14) # schib not available
+ tm 5(%r5),0x01 # devno valid?
+ bno 0(%r14)
+ la %r6,ipl_parameter_flags-.LPG2(%r12)
+ oi 3(%r6),0x01 # set flag
+ la %r2,ipl_devno-.LPG2(%r12)
+ mvc 0(2,%r2),6(%r5) # store devno
+ tm 4(%r5),0x80 # qdio capable device?
+ bno 0(%r14)
+ oi 3(%r6),0x02 # set flag
+
+ # copy ipl parameters
+
+ lhi %r0,4096
+ l %r2,20(%r0) # get address of parameter list
+ lhi %r3,IPL_PARMBLOCK_ORIGIN
+ st %r3,20(%r0)
+ lhi %r4,1
+ cr %r2,%r3 # start parameters < destination ?
+ jl 0f
+ lhi %r1,1 # copy direction is upwards
+ j 1f
+0: lhi %r1,-1 # copy direction is downwards
+ ar %r2,%r0
+ ar %r3,%r0
+ ar %r2,%r1
+ ar %r3,%r1
+1: mvc 0(1,%r3),0(%r2) # finally copy ipl parameters
+ ar %r3,%r1
+ ar %r2,%r1
+ sr %r0,%r4
+ jne 1b
+ b 0(%r14)
+
+ .align 4
+.Lipl_schib:
+ .rept 13
+ .long 0
+ .endr
+
+ .globl ipl_parameter_flags
+ipl_parameter_flags:
+ .long 0
+ .globl ipl_devno
+ipl_devno:
+ .word 0
+
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif
@@ -755,7 +817,7 @@ _pend:
#
.globl _stext
_stext: basr %r13,0 # get base
-.LPG2:
+.LPG3:
#
# Setup stack
#
@@ -774,7 +836,7 @@ _stext: basr %r13,0 # get base
lctlg %c0,%c15,0(%r15)
#
- lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
+ lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
brasl %r14,start_kernel # go to C code
#
# We returned from start_kernel ?!? PANIK
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