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[PATCH] s390: export ipl device parameters

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Sysfs interface to export ipl device parameters.  Dependent on the ipl type
the interface will look like this:

- ccw ipl:

/sys/firmware/ipl/device
		 /ipl_type

- fcp ipl:

/sys/firmware/ipl/binary_parameter
		 /bootprog
		 /br_lba
		 /device
		 /ipl_type
		 /lun
		 /scp_data
		 /wwpn

- otherwise (unknown that is):

/sys/firmware/ipl/ipl_type

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens
2005-10-30 15:00:11 -08:00
committed by Linus Torvalds
parent ed3cb6f039
commit 1e8e338325
4 changed files with 367 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

72
arch/s390/kernel/head.S
View File

@@ -485,7 +485,9 @@ start:
#
.org 0x10000
startup:basr %r13,0 # get base
.LPG1: lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
.LPG1: l %r1, .Lget_ipl_device_addr-.LPG1(%r13)
basr %r14, %r1
lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
la %r12,_pstart-.LPG1(%r13) # pointer to parameter area
# move IPL device to lowcore
mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
@@ -560,6 +562,9 @@ startup:basr %r13,0 # get base
mr %r2,%r1 # mem size in bytes in %r3
b .Lfchunk-.LPG1(%r13)
.align 4
.Lget_ipl_device_addr:
.long .Lget_ipl_device
.Lpmask:
.byte 0
.align 8
@@ -755,6 +760,63 @@ _pstart:
.global _pend
_pend:
.Lget_ipl_device:
basr %r12,0
.LPG2: l %r1,0xb8 # get sid
sll %r1,15 # test if subchannel is enabled
srl %r1,31
ltr %r1,%r1
bz 0(%r14) # subchannel disabled
l %r1,0xb8
la %r5,.Lipl_schib-.LPG2(%r12)
stsch 0(%r5) # get schib of subchannel
bnz 0(%r14) # schib not available
tm 5(%r5),0x01 # devno valid?
bno 0(%r14)
la %r6,ipl_parameter_flags-.LPG2(%r12)
oi 3(%r6),0x01 # set flag
la %r2,ipl_devno-.LPG2(%r12)
mvc 0(2,%r2),6(%r5) # store devno
tm 4(%r5),0x80 # qdio capable device?
bno 0(%r14)
oi 3(%r6),0x02 # set flag
# copy ipl parameters
lhi %r0,4096
l %r2,20(%r0) # get address of parameter list
lhi %r3,IPL_PARMBLOCK_ORIGIN
st %r3,20(%r0)
lhi %r4,1
cr %r2,%r3 # start parameters < destination ?
jl 0f
lhi %r1,1 # copy direction is upwards
j 1f
0: lhi %r1,-1 # copy direction is downwards
ar %r2,%r0
ar %r3,%r0
ar %r2,%r1
ar %r3,%r1
1: mvc 0(1,%r3),0(%r2) # finally copy ipl parameters
ar %r3,%r1
ar %r2,%r1
sr %r0,%r4
jne 1b
b 0(%r14)
.align 4
.Lipl_schib:
.rept 13
.long 0
.endr
.globl ipl_parameter_flags
ipl_parameter_flags:
.long 0
.globl ipl_devno
ipl_devno:
.word 0
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif
@@ -764,11 +826,11 @@ _pend:
#
.globl _stext
_stext: basr %r13,0 # get base
.LPG2:
.LPG3:
#
# Setup stack
#
l %r15,.Linittu-.LPG2(%r13)
l %r15,.Linittu-.LPG3(%r13)
mvc __LC_CURRENT(4),__TI_task(%r15)
ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
st %r15,__LC_KERNEL_STACK # set end of kernel stack
@@ -782,8 +844,8 @@ _stext: basr %r13,0 # get base
lctl %c0,%c15,0(%r15)
#
lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
l %r14,.Lstart-.LPG2(%r13)
lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
l %r14,.Lstart-.LPG3(%r13)
basr %r14,%r14 # call start_kernel
#
# We returned from start_kernel ?!? PANIK