[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, 39 insertions, 0 deletions

diff --git a/include/asm-s390/sclp.h b/include/asm-s390/sclp.h
new file mode 100644
index 000000000000..468b97018405
--- /dev/null
+++ b/include/asm-s390/sclp.h
@@ -0,0 +1,39 @@
+/*
+ *  include/asm-s390/sclp.h
+ *
+ *    Copyright IBM Corp. 2007
+ *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#ifndef _ASM_S390_SCLP_H
+#define _ASM_S390_SCLP_H
+
+#include <linux/types.h>
+
+struct sccb_header {
+        u16     length;
+        u8      function_code;
+        u8      control_mask[3];
+        u16     response_code;
+} __attribute__((packed));
+
+#define LOADPARM_LEN 8
+
+struct sclp_readinfo_sccb {
+        struct  sccb_header header;     /* 0-7 */
+        u16     rnmax;                  /* 8-9 */
+        u8      rnsize;                 /* 10 */
+        u8      _reserved0[24 - 11];    /* 11-23 */
+        u8      loadparm[LOADPARM_LEN]; /* 24-31 */
+        u8      _reserved1[91 - 32];    /* 32-90 */
+        u8      flags;                  /* 91 */
+        u8      _reserved2[100 - 92];   /* 92-99 */
+        u32     rnsize2;                /* 100-103 */
+        u64     rnmax2;                 /* 104-111 */
+        u8      _reserved3[4096 - 112]; /* 112-4095 */
+} __attribute__((packed, aligned(4096)));
+
+extern struct sclp_readinfo_sccb s390_readinfo_sccb;
+extern void sclp_readinfo_early(void);
+
+#endif /* _ASM_S390_SCLP_H */