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Commit 6fc321fd authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

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



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

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
parent 29c380f5

arch/s390/kernel/ipl.c

+22 −1
Original line number Diff line number Diff line
@@ -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);

drivers/s390/cio/cio.c

+10 −28
Original line number Diff line number Diff line
@@ -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;

}

include/asm-s390/cio.h

+7 −0
Original line number Diff line number Diff line
@@ -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

include/asm-s390/ipl.h

+1 −2
Original line number Diff line number Diff line
@@ -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);