[S390] sclp: introduce some new interfaces.

Introduce some new interfaces so that random subsystems don't have to
mess around with sclp internal structures.

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

2 files changed, 19 insertions, 42 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 50538e545618..9fcf3f1f47b6 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -171,37 +171,6 @@ static inline int memory_fast_detect(void)
 }
 #endif
 
-#define ADDR2G  (1UL << 31)
-
-static noinline __init unsigned long sclp_memory_detect(void)
-{
-        struct sclp_readinfo_sccb *sccb;
-        unsigned long long memsize;
-
-        sccb = &s390_readinfo_sccb;
-
-        if (sccb->header.response_code != 0x10)
-                return 0;
-
-        if (sccb->rnsize)
-                memsize = sccb->rnsize << 20;
-        else
-                memsize = sccb->rnsize2 << 20;
-        if (sccb->rnmax)
-                memsize *= sccb->rnmax;
-        else
-                memsize *= sccb->rnmax2;
-#ifndef CONFIG_64BIT
-        /*
-         * Can't deal with more than 2G in 31 bit addressing mode, so
-         * limit the value in order to avoid strange side effects.
-         */
-        if (memsize > ADDR2G)
-                memsize = ADDR2G;
-#endif
-        return (unsigned long) memsize;
-}
-
 static inline __init unsigned long __tprot(unsigned long addr)
 {
         int cc = -1;
@@ -218,6 +187,7 @@ static inline __init unsigned long __tprot(unsigned long addr)
 
 /* Checking memory in 128KB increments. */
 #define CHUNK_INCR      (1UL << 17)
+#define ADDR2G          (1UL << 31)
 
 static noinline __init void find_memory_chunks(unsigned long memsize)
 {
@@ -293,7 +263,7 @@ static noinline __init void setup_lowcore_early(void)
  */
 void __init startup_init(void)
 {
-        unsigned long memsize;
+        unsigned long long memsize;
 
         ipl_save_parameters();
         clear_bss_section();
@@ -306,7 +276,15 @@ void __init startup_init(void)
         setup_lowcore_early();
         sclp_readinfo_early();
         memsize = sclp_memory_detect();
+#ifndef CONFIG_64BIT
+        /*
+         * Can't deal with more than 2G in 31 bit addressing mode, so
+         * limit the value in order to avoid strange side effects.
+         */
+        if (memsize > ADDR2G)
+                memsize = ADDR2G;
+#endif
         if (memory_fast_detect() < 0)
-                find_memory_chunks(memsize);
+                find_memory_chunks((unsigned long) memsize);
         lockdep_on();
 }
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 367caf92ea78..82b131ddd7ff 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -25,10 +25,6 @@
 
 #define IPL_PARM_BLOCK_VERSION 0
 
-#define SCCB_VALID (s390_readinfo_sccb.header.response_code == 0x10)
-#define SCCB_LOADPARM (&s390_readinfo_sccb.loadparm)
-#define SCCB_FLAG (s390_readinfo_sccb.flags)
-
 #define IPL_UNKNOWN_STR         "unknown"
 #define IPL_CCW_STR             "ccw"
 #define IPL_FCP_STR             "fcp"
@@ -146,6 +142,8 @@ static struct ipl_parameter_block *dump_block_ccw;
 
 static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
 
+static struct sclp_ipl_info sclp_ipl_info;
+
 int diag308(unsigned long subcode, void *addr)
 {
         register unsigned long _addr asm("0") = (unsigned long) addr;
@@ -375,9 +373,9 @@ static ssize_t ipl_ccw_loadparm_show(struct kset *kset, char *page)
 {
         char loadparm[LOADPARM_LEN + 1] = {};
 
-        if (!SCCB_VALID)
+        if (!sclp_ipl_info.is_valid)
                 return sprintf(page, "#unknown#\n");
-        memcpy(loadparm, SCCB_LOADPARM, LOADPARM_LEN);
+        memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
         EBCASC(loadparm, LOADPARM_LEN);
         strstrip(loadparm);
         return sprintf(page, "%s\n", loadparm);
@@ -910,9 +908,9 @@ static int __init reipl_ccw_init(void)
         reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
         /* check if read scp info worked and set loadparm */
-        if (SCCB_VALID)
+        if (sclp_ipl_info.is_valid)
                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
-                       SCCB_LOADPARM, LOADPARM_LEN);
+                       &sclp_ipl_info.loadparm, LOADPARM_LEN);
         else
                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
@@ -1007,7 +1005,7 @@ static int __init dump_fcp_init(void)
 {
         int rc;
 
-        if(!(SCCB_FLAG & 0x2) || !SCCB_VALID)
+        if (!sclp_ipl_info.has_dump)
                 return 0; /* LDIPL DUMP is not installed */
         if (!diag308_set_works)
                 return 0;
@@ -1088,6 +1086,7 @@ static int __init s390_ipl_init(void)
 {
         int rc;
 
+        sclp_get_ipl_info(&sclp_ipl_info);
         reipl_probe();
         rc = ipl_init();
         if (rc)