[S390] codepage conversion of kernel parameter line

Move the ebcdic to ascii conversion of the kernel parameter line from
head.S to early.c and convert the assembler code to C.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/head.S

@@ -287,19 +287,7 @@ iplstart:
 	bz	.Lagain1		# skip dateset trailer
 	la	%r5,0(%r4,%r2)
 	lr	%r3,%r2
-.Lidebc:
-	tm	0(%r5),0x80		# high order bit set ?
-	bo	.Ldocv			#  yes -> convert from EBCDIC
-	ahi	%r5,-1
-	bct	%r3,.Lidebc
-	b	.Lnocv
-.Ldocv:
-	l	%r3,.Lcvtab
-	tr	0(256,%r4),0(%r3)	# convert parameters to ascii
-	tr	256(256,%r4),0(%r3)
-	tr	512(256,%r4),0(%r3)
-	tr	768(122,%r4),0(%r3)
-.Lnocv: la	%r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
+	la	%r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
 	mvc	0(256,%r3),0(%r4)
 	mvc	256(256,%r3),256(%r4)
 	mvc	512(256,%r3),512(%r4)
@@ -383,7 +371,6 @@ iplstart:
 .Linitrd:.long _end + 0x400000		# default address of initrd
 .Lparm:	.long  PARMAREA
 .Lstartup: .long startup
-.Lcvtab:.long	_ebcasc 		# ebcdic to ascii table
 .Lreset:.byte	0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
 	.byte	0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
 	.byte	0xc8,0xd6,0xd3,0xc4	# "change rdr all keep nohold"
@@ -416,13 +403,10 @@ start:
 .sk8x8:
 	mvc	0(240,%r8),0(%r9)	# copy iplparms into buffer
 .gotr:
-	l	%r10,.tbl		# EBCDIC to ASCII table
-	tr	0(240,%r8),0(%r10)
 	slr	%r0,%r0
 	st	%r0,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r11)
 	st	%r0,INITRD_START+ARCH_OFFSET-PARMAREA(%r11)
 	j	startup 		# continue with startup
-.tbl:	.long	_ebcasc			# translate table
 .cmd:	.long	COMMAND_LINE		# address of command line buffer
 .parm:	.long	PARMAREA
 .lowcase: