[S390] cio/ipl: Clean interface between cio and ipl code.

Clean interface between cio and ipl code, so Peter stops complaining.

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

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index f731185..a83cf1f 100644 (file)
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -47,7 +47,7 @@ enum ipl_type {
  * Must be in data section since the bss section
  * is not cleared when these are accessed.
  */
-u16 ipl_devno __attribute__((__section__(".data"))) = 0;
+static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
 
 static char *ipl_type_str(enum ipl_type type)
@@ -1038,6 +1038,27 @@ static int __init s390_ipl_init(void)
 
 __initcall(s390_ipl_init);
 
+void __init ipl_save_parameters(void)
+{
+       struct cio_iplinfo iplinfo;
+       unsigned int *ipl_ptr;
+       void *src, *dst;
+
+       if (cio_get_iplinfo(&iplinfo))
+               return;
+
+       ipl_devno = iplinfo.devno;
+       ipl_flags |= IPL_DEVNO_VALID;
+       if (!iplinfo.is_qdio)
+               return;
+       ipl_flags |= IPL_PARMBLOCK_VALID;
+       ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
+       src = (void *)(unsigned long)*ipl_ptr;
+       dst = (void *)IPL_PARMBLOCK_ORIGIN;
+       memmove(dst, src, PAGE_SIZE);
+       *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
+}
+
 static LIST_HEAD(rcall);
 static DEFINE_MUTEX(rcall_mutex);
 

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 9cb129a..21af446 100644 (file)
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -1048,37 +1048,19 @@ void reipl_ccw_dev(struct ccw_dev_id *devid)
        do_reipl_asm(*((__u32*)&schid));
 }
 
-static struct schib __initdata ipl_schib;
-
-/*
- * ipl_save_parameters gets called very early. It is not allowed to access
- * anything in the bss section at all. The bss section is not cleared yet,
- * but may contain some ipl parameters written by the firmware.
- * These parameters (if present) are copied to 0x2000.
- * To avoid corruption of the ipl parameters, all variables used by this
- * function must reside on the stack or in the data section.
- */
-void ipl_save_parameters(void)
+int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
 {
        struct subchannel_id schid;
-       unsigned int *ipl_ptr;
-       void *src, *dst;
+       struct schib schib;
 
        schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID;
        if (!schid.one)
-               return;
-       if (stsch(schid, &ipl_schib))
-               return;
-       if (!ipl_schib.pmcw.dnv)
-               return;
-       ipl_devno = ipl_schib.pmcw.dev;
-       ipl_flags |= IPL_DEVNO_VALID;
-       if (!ipl_schib.pmcw.qf)
-               return;
-       ipl_flags |= IPL_PARMBLOCK_VALID;
-       ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
-       src = (void *)(unsigned long)*ipl_ptr;
-       dst = (void *)IPL_PARMBLOCK_ORIGIN;
-       memmove(dst, src, PAGE_SIZE);
-       *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
+               return -ENODEV;
+       if (stsch(schid, &schib))
+               return -ENODEV;
+       if (!schib.pmcw.dnv)
+               return -ENODEV;
+       iplinfo->devno = schib.pmcw.dev;
+       iplinfo->is_qdio = schib.pmcw.qf;
+       return 0;
 }

diff --git a/include/asm-s390/cio.h b/include/asm-s390/cio.h
index d927850..0db017b 100644 (file)
--- a/include/asm-s390/cio.h
+++ b/include/asm-s390/cio.h
@@ -292,6 +292,13 @@ extern void css_schedule_reprobe(void);
 
 extern void reipl_ccw_dev(struct ccw_dev_id *id);
 
+struct cio_iplinfo {
+       u16 devno;
+       int is_qdio;
+};
+
+extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo);
+
 #endif
 
 #endif

diff --git a/include/asm-s390/ipl.h b/include/asm-s390/ipl.h
index 0eb6408..15bb0b5 100644 (file)
--- a/include/asm-s390/ipl.h
+++ b/include/asm-s390/ipl.h
@@ -74,10 +74,9 @@ struct ipl_parameter_block {
 } __attribute__((packed));
 
 /*
- * IPL validity flags and parameters as detected in head.S
+ * IPL validity flags
  */
 extern u32 ipl_flags;
-extern u16 ipl_devno;
 
 extern u32 dump_prefix_page;
 extern void do_reipl(void);