[S390] Convert memory detection into C code.

Hopefully this will make it more maintainable and less error prone.
Code makes use of search_exception_tables(). Since it calls this
function before the kernel exeception table is sorted, there is an
early call to sort_main_extable().

This way it's easy to use the already present infrastructure of fixup
sections. Also this would allows to easily convert the rest of
head[31|64].S into C code.

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

1 files changed, 6 insertions, 9 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 13eacce62011..052259530651 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -20,14 +20,13 @@
 #include <asm/cio.h>
 #include <asm/ebcdic.h>
 #include <asm/reset.h>
+#include <asm/sclp.h>
 
 #define IPL_PARM_BLOCK_VERSION 0
-#define LOADPARM_LEN 8
 
-extern char s390_readinfo_sccb[];
-#define SCCB_VALID (*((__u16*)&s390_readinfo_sccb[6]) == 0x0010)
-#define SCCB_LOADPARM (&s390_readinfo_sccb[24])
-#define SCCB_FLAG (s390_readinfo_sccb[91])
+#define SCCB_VALID (s390_readinfo_sccb.header.response_code == 0x10)
+#define SCCB_LOADPARM (&s390_readinfo_sccb.loadparm)
+#define SCCB_FLAG (s390_readinfo_sccb.flags)
 
 enum ipl_type {
         IPL_TYPE_NONE    = 1,
@@ -1080,8 +1079,6 @@ static void do_reset_calls(void)
                 reset->fn();
 }
 
-extern void reset_mcck_handler(void);
-extern void reset_pgm_handler(void);
 extern __u32 dump_prefix_page;
 
 void s390_reset_system(void)
@@ -1105,12 +1102,12 @@ void s390_reset_system(void)
         /* Set new machine check handler */
         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
         S390_lowcore.mcck_new_psw.addr =
-                PSW_ADDR_AMODE | (unsigned long) &reset_mcck_handler;
+                PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
 
         /* Set new program check handler */
         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
         S390_lowcore.program_new_psw.addr =
-                PSW_ADDR_AMODE | (unsigned long) &reset_pgm_handler;
+                PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
 
         do_reset_calls();
 }