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Diffstat (limited to 'arch/s390/kernel/head64.S')
-rw-r--r--arch/s390/kernel/head64.S443
1 files changed, 227 insertions, 216 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index a8bdd96494c..b30e5897cdf 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -15,232 +15,232 @@
# this is called either by the ipl loader or directly by PSW restart
# or linload or SALIPL
#
- .org 0x10000
-startup:basr %r13,0 # get base
-.LPG0: l %r13,0f-.LPG0(%r13)
- b 0(%r13)
-0: .long startup_continue
+ .org 0x10000
+startup:basr %r13,0 # get base
+.LPG0: l %r13,0f-.LPG0(%r13)
+ b 0(%r13)
+0: .long startup_continue
#
# params at 10400 (setup.h)
#
- .org PARMAREA
- .quad 0 # IPL_DEVICE
- .quad 0 # INITRD_START
- .quad 0 # INITRD_SIZE
+ .org PARMAREA
+ .quad 0 # IPL_DEVICE
+ .quad 0 # INITRD_START
+ .quad 0 # INITRD_SIZE
- .org COMMAND_LINE
- .byte "root=/dev/ram0 ro"
- .byte 0
+ .org COMMAND_LINE
+ .byte "root=/dev/ram0 ro"
+ .byte 0
- .org 0x11000
+ .org 0x11000
startup_continue:
- basr %r13,0 # get base
-.LPG1: sll %r13,1 # remove high order bit
- srl %r13,1
- lhi %r1,1 # mode 1 = esame
- mvi __LC_AR_MODE_ID,1 # set esame flag
- slr %r0,%r0 # set cpuid to zero
- sigp %r1,%r0,0x12 # switch to esame mode
- sam64 # switch to 64 bit mode
- lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
- lg %r12,.Lparmaddr-.LPG1(%r13)# pointer to parameter area
- # move IPL device to lowcore
- mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
+ basr %r13,0 # get base
+.LPG1: sll %r13,1 # remove high order bit
+ srl %r13,1
+ lhi %r1,1 # mode 1 = esame
+ mvi __LC_AR_MODE_ID,1 # set esame flag
+ slr %r0,%r0 # set cpuid to zero
+ sigp %r1,%r0,0x12 # switch to esame mode
+ sam64 # switch to 64 bit mode
+ lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
+ lg %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
+ # move IPL device to lowcore
+ mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
#
# Setup stack
#
- larl %r15,init_thread_union
- lg %r14,__TI_task(%r15) # cache current in lowcore
- stg %r14,__LC_CURRENT
- aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
- stg %r15,__LC_KERNEL_STACK # set end of kernel stack
- aghi %r15,-160
- xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
+ larl %r15,init_thread_union
+ lg %r14,__TI_task(%r15) # cache current in lowcore
+ stg %r14,__LC_CURRENT
+ aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
+ stg %r15,__LC_KERNEL_STACK # set end of kernel stack
+ aghi %r15,-160
+ xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
- brasl %r14,ipl_save_parameters
+ brasl %r14,ipl_save_parameters
#
# clear bss memory
#
- larl %r2,__bss_start # start of bss segment
- larl %r3,_end # end of bss segment
- sgr %r3,%r2 # length of bss
- sgr %r4,%r4 #
- sgr %r5,%r5 # set src,length and pad to zero
- mvcle %r2,%r4,0 # clear mem
- jo .-4 # branch back, if not finish
+ larl %r2,__bss_start # start of bss segment
+ larl %r3,_end # end of bss segment
+ sgr %r3,%r2 # length of bss
+ sgr %r4,%r4 #
+ sgr %r5,%r5 # set src,length and pad to zero
+ mvcle %r2,%r4,0 # clear mem
+ jo .-4 # branch back, if not finish
- l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
+ l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
.Lservicecall:
- stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
+ stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
- stctg %r0,%r0,.Lcr-.LPG1(%r13) # get cr0
- la %r1,0x200 # set bit 22
- og %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
- stg %r1,.Lcr-.LPG1(%r13)
- lctlg %r0,%r0,.Lcr-.LPG1(%r13) # load modified cr0
+ stctg %r0,%r0,.Lcr-.LPG1(%r13) # get cr0
+ la %r1,0x200 # set bit 22
+ og %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
+ stg %r1,.Lcr-.LPG1(%r13)
+ lctlg %r0,%r0,.Lcr-.LPG1(%r13) # load modified cr0
- mvc __LC_EXT_NEW_PSW(8),.Lpcmsk-.LPG1(%r13) # set postcall psw
- larl %r1,.Lsclph
- stg %r1,__LC_EXT_NEW_PSW+8 # set handler
+ mvc __LC_EXT_NEW_PSW(8),.Lpcmsk-.LPG1(%r13) # set postcall psw
+ larl %r1,.Lsclph
+ stg %r1,__LC_EXT_NEW_PSW+8 # set handler
- larl %r4,.Lsccb # %r4 is our index for sccb stuff
- lgr %r1,%r4 # our sccb
- .insn rre,0xb2200000,%r2,%r1 # service call
- ipm %r1
- srl %r1,28 # get cc code
- xr %r3,%r3
- chi %r1,3
- be .Lfchunk-.LPG1(%r13) # leave
- chi %r1,2
- be .Lservicecall-.LPG1(%r13)
- lpswe .Lwaitsclp-.LPG1(%r13)
+ larl %r4,.Lsccb # %r4 is our index for sccb stuff
+ lgr %r1,%r4 # our sccb
+ .insn rre,0xb2200000,%r2,%r1 # service call
+ ipm %r1
+ srl %r1,28 # get cc code
+ xr %r3,%r3
+ chi %r1,3
+ be .Lfchunk-.LPG1(%r13) # leave
+ chi %r1,2
+ be .Lservicecall-.LPG1(%r13)
+ lpswe .Lwaitsclp-.LPG1(%r13)
.Lsclph:
- lh %r1,.Lsccbr-.Lsccb(%r4)
- chi %r1,0x10 # 0x0010 is the sucess code
- je .Lprocsccb # let's process the sccb
- chi %r1,0x1f0
- bne .Lfchunk-.LPG1(%r13) # unhandled error code
- c %r2,.Lrcp-.LPG1(%r13) # Did we try Read SCP forced
- bne .Lfchunk-.LPG1(%r13) # if no, give up
- l %r2,.Lrcp2-.LPG1(%r13) # try with Read SCP
- b .Lservicecall-.LPG1(%r13)
+ lh %r1,.Lsccbr-.Lsccb(%r4)
+ chi %r1,0x10 # 0x0010 is the sucess code
+ je .Lprocsccb # let's process the sccb
+ chi %r1,0x1f0
+ bne .Lfchunk-.LPG1(%r13) # unhandled error code
+ c %r2,.Lrcp-.LPG1(%r13) # Did we try Read SCP forced
+ bne .Lfchunk-.LPG1(%r13) # if no, give up
+ l %r2,.Lrcp2-.LPG1(%r13) # try with Read SCP
+ b .Lservicecall-.LPG1(%r13)
.Lprocsccb:
- lghi %r1,0
- icm %r1,3,.Lscpincr1-.Lsccb(%r4) # use this one if != 0
- jnz .Lscnd
- lg %r1,.Lscpincr2-.Lsccb(%r4) # otherwise use this one
+ lghi %r1,0
+ icm %r1,3,.Lscpincr1-.Lsccb(%r4) # use this one if != 0
+ jnz .Lscnd
+ lg %r1,.Lscpincr2-.Lsccb(%r4) # otherwise use this one
.Lscnd:
- xr %r3,%r3 # same logic
- ic %r3,.Lscpa1-.Lsccb(%r4)
- chi %r3,0x00
- jne .Lcompmem
- l %r3,.Lscpa2-.Lsccb(%r4)
+ xr %r3,%r3 # same logic
+ ic %r3,.Lscpa1-.Lsccb(%r4)
+ chi %r3,0x00
+ jne .Lcompmem
+ l %r3,.Lscpa2-.Lsccb(%r4)
.Lcompmem:
- mlgr %r2,%r1 # mem in MB on 128-bit
- l %r1,.Lonemb-.LPG1(%r13)
- mlgr %r2,%r1 # mem size in bytes in %r3
- b .Lfchunk-.LPG1(%r13)
+ mlgr %r2,%r1 # mem in MB on 128-bit
+ l %r1,.Lonemb-.LPG1(%r13)
+ mlgr %r2,%r1 # mem size in bytes in %r3
+ b .Lfchunk-.LPG1(%r13)
- .align 4
+ .align 4
.Lpmask:
- .byte 0
- .align 8
+ .byte 0
+ .align 8
.Lcr:
- .quad 0x00 # place holder for cr0
+ .quad 0x00 # place holder for cr0
.Lwaitsclp:
- .quad 0x0102000180000000,.Lsclph
+ .quad 0x0102000180000000,.Lsclph
.Lrcp:
- .int 0x00120001 # Read SCP forced code
+ .int 0x00120001 # Read SCP forced code
.Lrcp2:
- .int 0x00020001 # Read SCP code
+ .int 0x00020001 # Read SCP code
.Lonemb:
- .int 0x100000
+ .int 0x100000
.Lfchunk:
- # set program check new psw mask
- mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
+ # set program check new psw mask
+ mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
#
# find memory chunks.
#
- lgr %r9,%r3 # end of mem
- larl %r1,.Lchkmem # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
- la %r1,1 # test in increments of 128KB
- sllg %r1,%r1,17
- larl %r3,memory_chunk
- slgr %r4,%r4 # set start of chunk to zero
- slgr %r5,%r5 # set end of chunk to zero
- slr %r6,%r6 # set access code to zero
- la %r10,MEMORY_CHUNKS # number of chunks
+ lgr %r9,%r3 # end of mem
+ larl %r1,.Lchkmem # set program check address
+ stg %r1,__LC_PGM_NEW_PSW+8
+ la %r1,1 # test in increments of 128KB
+ sllg %r1,%r1,17
+ larl %r3,memory_chunk
+ slgr %r4,%r4 # set start of chunk to zero
+ slgr %r5,%r5 # set end of chunk to zero
+ slr %r6,%r6 # set access code to zero
+ la %r10,MEMORY_CHUNKS # number of chunks
.Lloop:
- tprot 0(%r5),0 # test protection of first byte
- ipm %r7
- srl %r7,28
- clr %r6,%r7 # compare cc with last access code
- je .Lsame
- j .Lchkmem
+ tprot 0(%r5),0 # test protection of first byte
+ ipm %r7
+ srl %r7,28
+ clr %r6,%r7 # compare cc with last access code
+ je .Lsame
+ j .Lchkmem
.Lsame:
- algr %r5,%r1 # add 128KB to end of chunk
- # no need to check here,
- brc 12,.Lloop # this is the same chunk
-.Lchkmem: # > 16EB or tprot got a program check
- clgr %r4,%r5 # chunk size > 0?
- je .Lchkloop
- stg %r4,0(%r3) # store start address of chunk
- lgr %r0,%r5
- slgr %r0,%r4
- stg %r0,8(%r3) # store size of chunk
- st %r6,20(%r3) # store type of chunk
- la %r3,24(%r3)
- larl %r8,memory_size
- stg %r5,0(%r8) # store memory size
- ahi %r10,-1 # update chunk number
+ algr %r5,%r1 # add 128KB to end of chunk
+ # no need to check here,
+ brc 12,.Lloop # this is the same chunk
+.Lchkmem: # > 16EB or tprot got a program check
+ clgr %r4,%r5 # chunk size > 0?
+ je .Lchkloop
+ stg %r4,0(%r3) # store start address of chunk
+ lgr %r0,%r5
+ slgr %r0,%r4
+ stg %r0,8(%r3) # store size of chunk
+ st %r6,20(%r3) # store type of chunk
+ la %r3,24(%r3)
+ larl %r8,memory_size
+ stg %r5,0(%r8) # store memory size
+ ahi %r10,-1 # update chunk number
.Lchkloop:
- lr %r6,%r7 # set access code to last cc
+ lr %r6,%r7 # set access code to last cc
# we got an exception or we're starting a new
# chunk , we must check if we should
# still try to find valid memory (if we detected
# the amount of available storage), and if we
# have chunks left
- lghi %r4,1
- sllg %r4,%r4,31
- clgr %r5,%r4
- je .Lhsaskip
- xr %r0, %r0
- clgr %r0, %r9 # did we detect memory?
- je .Ldonemem # if not, leave
- chi %r10, 0 # do we have chunks left?
- je .Ldonemem
+ lghi %r4,1
+ sllg %r4,%r4,31
+ clgr %r5,%r4
+ je .Lhsaskip
+ xr %r0, %r0
+ clgr %r0, %r9 # did we detect memory?
+ je .Ldonemem # if not, leave
+ chi %r10, 0 # do we have chunks left?
+ je .Ldonemem
.Lhsaskip:
- algr %r5,%r1 # add 128KB to end of chunk
- lgr %r4,%r5 # potential new chunk
- clgr %r5,%r9 # should we go on?
- jl .Lloop
-.Ldonemem:
+ algr %r5,%r1 # add 128KB to end of chunk
+ lgr %r4,%r5 # potential new chunk
+ clgr %r5,%r9 # should we go on?
+ jl .Lloop
+.Ldonemem:
- larl %r12,machine_flags
+ larl %r12,machine_flags
#
# find out if we are running under VM
#
- stidp __LC_CPUID # store cpuid
- tm __LC_CPUID,0xff # running under VM ?
- bno 0f-.LPG1(%r13)
- oi 7(%r12),1 # set VM flag
-0: lh %r0,__LC_CPUID+4 # get cpu version
- chi %r0,0x7490 # running on a P/390 ?
- bne 1f-.LPG1(%r13)
- oi 7(%r12),4 # set P/390 flag
+ stidp __LC_CPUID # store cpuid
+ tm __LC_CPUID,0xff # running under VM ?
+ bno 0f-.LPG1(%r13)
+ oi 7(%r12),1 # set VM flag
+0: lh %r0,__LC_CPUID+4 # get cpu version
+ chi %r0,0x7490 # running on a P/390 ?
+ bne 1f-.LPG1(%r13)
+ oi 7(%r12),4 # set P/390 flag
1:
#
# find out if we have the MVPG instruction
#
- la %r1,0f-.LPG1(%r13) # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
- sgr %r0,%r0
- lghi %r1,0
- lghi %r2,0
- mvpg %r1,%r2 # test MVPG instruction
- oi 7(%r12),16 # set MVPG flag
+ la %r1,0f-.LPG1(%r13) # set program check address
+ stg %r1,__LC_PGM_NEW_PSW+8
+ sgr %r0,%r0
+ lghi %r1,0
+ lghi %r2,0
+ mvpg %r1,%r2 # test MVPG instruction
+ oi 7(%r12),16 # set MVPG flag
0:
#
# find out if the diag 0x44 works in 64 bit mode
#
- la %r1,0f-.LPG1(%r13) # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
- diag 0,0,0x44 # test diag 0x44
- oi 7(%r12),32 # set diag44 flag
-0:
+ la %r1,0f-.LPG1(%r13) # set program check address
+ stg %r1,__LC_PGM_NEW_PSW+8
+ diag 0,0,0x44 # test diag 0x44
+ oi 7(%r12),32 # set diag44 flag
+0:
#
# find out if we have the IDTE instruction
#
- la %r1,0f-.LPG1(%r13) # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
+ la %r1,0f-.LPG1(%r13) # set program check address
+ stg %r1,__LC_PGM_NEW_PSW+8
.long 0xb2b10000 # store facility list
tm 0xc8,0x08 # check bit for clearing-by-ASCE
bno 0f-.LPG1(%r13)
@@ -251,6 +251,17 @@ startup_continue:
0:
#
+# find out if the diag 0x9c is available
+#
+ la %r1,0f-.LPG1(%r13) # set program check address
+ stg %r1,__LC_PGM_NEW_PSW+8
+ stap __LC_CPUID+4 # store cpu address
+ lh %r1,__LC_CPUID+4
+ diag %r1,0,0x9c # test diag 0x9c
+ oi 6(%r12),1 # set diag9c flag
+0:
+
+#
# find out if we have the MVCOS instruction
#
la %r1,0f-.LPG1(%r13) # set program check address
@@ -263,45 +274,45 @@ startup_continue:
oi 6(%r12),2 # set MVCOS flag
1:
- lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
- # virtual and never return ...
- .align 16
-.Lentry:.quad 0x0000000180000000,_stext
-.Lctl: .quad 0x04b50002 # cr0: various things
- .quad 0 # cr1: primary space segment table
- .quad .Lduct # cr2: dispatchable unit control table
- .quad 0 # cr3: instruction authorization
- .quad 0 # cr4: instruction authorization
- .quad 0xffffffffffffffff # cr5: primary-aste origin
- .quad 0 # cr6: I/O interrupts
- .quad 0 # cr7: secondary space segment table
- .quad 0 # cr8: access registers translation
- .quad 0 # cr9: tracing off
- .quad 0 # cr10: tracing off
- .quad 0 # cr11: tracing off
- .quad 0 # cr12: tracing off
- .quad 0 # cr13: home space segment table
- .quad 0xc0000000 # cr14: machine check handling off
- .quad 0 # cr15: linkage stack operations
-.Lduct: .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
-.Lpcmsk:.quad 0x0000000180000000
+ lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
+ # virtual and never return ...
+ .align 16
+.Lentry:.quad 0x0000000180000000,_stext
+.Lctl: .quad 0x04b50002 # cr0: various things
+ .quad 0 # cr1: primary space segment table
+ .quad .Lduct # cr2: dispatchable unit control table
+ .quad 0 # cr3: instruction authorization
+ .quad 0 # cr4: instruction authorization
+ .quad 0xffffffffffffffff # cr5: primary-aste origin
+ .quad 0 # cr6: I/O interrupts
+ .quad 0 # cr7: secondary space segment table
+ .quad 0 # cr8: access registers translation
+ .quad 0 # cr9: tracing off
+ .quad 0 # cr10: tracing off
+ .quad 0 # cr11: tracing off
+ .quad 0 # cr12: tracing off
+ .quad 0 # cr13: home space segment table
+ .quad 0xc0000000 # cr14: machine check handling off
+ .quad 0 # cr15: linkage stack operations
+.Lduct: .long 0,0,0,0,0,0,0,0
+ .long 0,0,0,0,0,0,0,0
+.Lpcmsk:.quad 0x0000000180000000
.L4malign:.quad 0xffffffffffc00000
-.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
-.Lnop: .long 0x07000700
+.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
+.Lnop: .long 0x07000700
.Lparmaddr:
.quad PARMAREA
- .globl ipl_schib
+ .globl ipl_schib
ipl_schib:
.rept 13
.long 0
.endr
- .globl ipl_flags
+ .globl ipl_flags
ipl_flags:
- .long 0
- .globl ipl_devno
+ .long 0
+ .globl ipl_devno
ipl_devno:
.word 0
@@ -309,47 +320,47 @@ ipl_devno:
.globl s390_readinfo_sccb
s390_readinfo_sccb:
.Lsccb:
- .hword 0x1000 # length, one page
- .byte 0x00,0x00,0x00
- .byte 0x80 # variable response bit set
+ .hword 0x1000 # length, one page
+ .byte 0x00,0x00,0x00
+ .byte 0x80 # variable response bit set
.Lsccbr:
- .hword 0x00 # response code
+ .hword 0x00 # response code
.Lscpincr1:
- .hword 0x00
+ .hword 0x00
.Lscpa1:
- .byte 0x00
- .fill 89,1,0
+ .byte 0x00
+ .fill 89,1,0
.Lscpa2:
- .int 0x00
+ .int 0x00
.Lscpincr2:
- .quad 0x00
- .fill 3984,1,0
+ .quad 0x00
+ .fill 3984,1,0
.org 0x13000
#ifdef CONFIG_SHARED_KERNEL
- .org 0x100000
+ .org 0x100000
#endif
-
+
#
# startup-code, running in absolute addressing mode
#
- .globl _stext
-_stext: basr %r13,0 # get base
+ .globl _stext
+_stext: basr %r13,0 # get base
.LPG3:
# check control registers
- stctg %c0,%c15,0(%r15)
- oi 6(%r15),0x40 # enable sigp emergency signal
- oi 4(%r15),0x10 # switch on low address proctection
- lctlg %c0,%c15,0(%r15)
+ stctg %c0,%c15,0(%r15)
+ oi 6(%r15),0x40 # enable sigp emergency signal
+ oi 4(%r15),0x10 # switch on low address proctection
+ lctlg %c0,%c15,0(%r15)
- lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
- brasl %r14,start_kernel # go to C code
+ lam 0,15,.Laregs-.LPG3(%r13) # load acrs needed by uaccess
+ brasl %r14,start_kernel # go to C code
#
# We returned from start_kernel ?!? PANIK
#
- basr %r13,0
- lpswe .Ldw-.(%r13) # load disabled wait psw
+ basr %r13,0
+ lpswe .Ldw-.(%r13) # load disabled wait psw
- .align 8
-.Ldw: .quad 0x0002000180000000,0x0000000000000000
-.Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+ .align 8
+.Ldw: .quad 0x0002000180000000,0x0000000000000000
+.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-03 02:37:46 +0000