s390: remove 31 bit support

Remove the 31 bit support in order to reduce maintenance cost and
effectively remove dead code. Since a couple of years there is no
distribution left that comes with a 31 bit kernel.

The 31 bit kernel also has been broken since more than a year before
anybody noticed. In addition I added a removal warning to the kernel
shown at ipl for 5 minutes: a960062e5826 ("s390: add 31 bit warning
message") which let everybody know about the plan to remove 31 bit
code. We didn't get any response.

Given that the last 31 bit only machine was introduced in 1999 let's
remove the code.
Anybody with 31 bit user space code can still use the compat mode.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 0 insertions, 49 deletions

diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 132f4c9ade60..59b7c6470567 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -27,11 +27,7 @@
 #include <asm/thread_info.h>
 #include <asm/page.h>
 
-#ifdef CONFIG_64BIT
 #define ARCH_OFFSET	4
-#else
-#define ARCH_OFFSET	0
-#endif
 
 __HEAD
 
@@ -67,7 +63,6 @@ __HEAD
 # subroutine to set architecture mode
 #
 .Lsetmode:
-#ifdef CONFIG_64BIT
 	mvi	__LC_AR_MODE_ID,1	# set esame flag
 	slr	%r0,%r0 		# set cpuid to zero
 	lhi	%r1,2			# mode 2 = esame (dump)
@@ -76,16 +71,12 @@ __HEAD
 	.fill	16,4,0x0
 0:	lmh	%r0,%r15,0(%r13)	# clear high-order half of gprs
 	sam31				# switch to 31 bit addressing mode
-#else
-	mvi	__LC_AR_MODE_ID,0	# set ESA flag (mode 0)
-#endif
 	br	%r14
 
 #
 # subroutine to wait for end I/O
 #
 .Lirqwait:
-#ifdef CONFIG_64BIT
 	mvc	0x1f0(16),.Lnewpsw	# set up IO interrupt psw
 	lpsw	.Lwaitpsw
 .Lioint:
@@ -93,15 +84,6 @@ __HEAD
 	.align	8
 .Lnewpsw:
 	.quad	0x0000000080000000,.Lioint
-#else
-	mvc	0x78(8),.Lnewpsw	# set up IO interrupt psw
-	lpsw	.Lwaitpsw
-.Lioint:
-	br	%r14
-	.align	8
-.Lnewpsw:
-	.long	0x00080000,0x80000000+.Lioint
-#endif
 .Lwaitpsw:
 	.long	0x020a0000,0x80000000+.Lioint
 
@@ -375,7 +357,6 @@ ENTRY(startup)
 ENTRY(startup_kdump)
 	j	.Lep_startup_kdump
 .Lep_startup_normal:
-#ifdef CONFIG_64BIT
 	mvi	__LC_AR_MODE_ID,1	# set esame flag
 	slr	%r0,%r0 		# set cpuid to zero
 	lhi	%r1,2			# mode 2 = esame (dump)
@@ -384,9 +365,6 @@ ENTRY(startup_kdump)
 	.fill	16,4,0x0
 0:	lmh	%r0,%r15,0(%r13)	# clear high-order half of gprs
 	sam31				# switch to 31 bit addressing mode
-#else
-	mvi	__LC_AR_MODE_ID,0	# set ESA flag (mode 0)
-#endif
 	basr	%r13,0			# get base
 .LPG0:
 	xc	0x200(256),0x200	# partially clear lowcore
@@ -396,7 +374,6 @@ ENTRY(startup_kdump)
 	spt	6f-.LPG0(%r13)
 	mvc	__LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
 	xc	__LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
-#ifndef CONFIG_MARCH_G5
 	# check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
 	.insn	s,0xb2b10000,0		# store facilities @ __LC_STFL_FAC_LIST
 	tm	__LC_STFL_FAC_LIST,0x01	# stfle available ?
@@ -435,7 +412,6 @@ ENTRY(startup_kdump)
 # the kernel will crash. Format is number of facility words with bits set,
 # followed by the facility words.
 
-#if defined(CONFIG_64BIT)
 #if defined(CONFIG_MARCH_Z13)
 	.long 3, 0xc100eff2, 0xf46ce800, 0x00400000
 #elif defined(CONFIG_MARCH_ZEC12)
@@ -451,35 +427,10 @@ ENTRY(startup_kdump)
 #elif defined(CONFIG_MARCH_Z900)
 	.long 1, 0xc0000000
 #endif
-#else
-#if defined(CONFIG_MARCH_ZEC12)
-	.long 1, 0x8100c880
-#elif defined(CONFIG_MARCH_Z196)
-	.long 1, 0x8100c880
-#elif defined(CONFIG_MARCH_Z10)
-	.long 1, 0x8100c880
-#elif defined(CONFIG_MARCH_Z9_109)
-	.long 1, 0x8100c880
-#elif defined(CONFIG_MARCH_Z990)
-	.long 1, 0x80002000
-#elif defined(CONFIG_MARCH_Z900)
-	.long 1, 0x80000000
-#endif
-#endif
 4:
-#endif
-
-#ifdef CONFIG_64BIT
 	/* Continue with 64bit startup code in head64.S */
 	sam64				# switch to 64 bit mode
 	jg	startup_continue
-#else
-	/* Continue with 31bit startup code in head31.S */
-	l	%r13,5f-.LPG0(%r13)
-	b	0(%r13)
-	.align	8
-5:	.long	startup_continue
-#endif
 
 	.align	8
 6:	.long	0x7fffffff,0xffffffff