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android_kernel_xiaomi_sm8350/arch/s390/kernel/head64.S
Martin Schwidefsky 6f457e1a14 [S390] Fix tlb flushing with idte. 
The clear-by-asce operation of the idte instruction gets an asce
(address-space-control-element) as argument to specify which TLBs
need to get flushed. The current code passes a plain pointer to
the start of the pgd without the additional bits which would make
the pointer an asce. The current machines don't mind the difference
but a future model might want to use the designation type control
bits in the asce as a filter for the TLBs to flush.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-01-26 14:11:10 +01:00

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/*
* arch/s390/kernel/head64.S
*
* Copyright (C) IBM Corp. 1999,2006
*
* Author(s): Hartmut Penner <hp@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Rob van der Heij <rvdhei@iae.nl>
* Heiko Carstens <heiko.carstens@de.ibm.com>
*
*/
#
# startup-code at 0x10000, running in absolute addressing mode
# 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
#
# params at 10400 (setup.h)
#
.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 0x11000
startup_continue:
basr %r13,0 # get base
.LPG1: sll %r13,1 # remove high order bit
srl %r13,1
#ifdef CONFIG_ZFCPDUMP
# check if we have been ipled using zfcp dump:
tm 0xb9,0x01 # test if subchannel is enabled
jno .nodump # subchannel disabled
l %r1,0xb8
la %r5,.Lipl_schib-.LPG1(%r13)
stsch 0(%r5) # get schib of subchannel
jne .nodump # schib not available
tm 5(%r5),0x01 # devno valid?
jno .nodump
tm 4(%r5),0x80 # qdio capable device?
jno .nodump
l %r2,20(%r0) # address of ipl parameter block
lhi %r3,0
ic %r3,0x148(%r2) # get opt field
chi %r3,0x20 # load with dump?
jne .nodump
# store all prefix registers in case of load with dump:
la %r7,0 # base register for 0 page
la %r8,0 # first cpu
l %r11,.Lpref_arr_ptr-.LPG1(%r13) # address of prefix array
ahi %r11,4 # skip boot cpu
lr %r12,%r11
ahi %r12,(CONFIG_NR_CPUS*4) # end of prefix array
stap .Lcurrent_cpu+2-.LPG1(%r13) # store current cpu addr
1:
cl %r8,.Lcurrent_cpu-.LPG1(%r13) # is ipl cpu ?
je 4f # if yes get next cpu
2:
lr %r9,%r7
sigp %r9,%r8,0x9 # stop & store status of cpu
brc 8,3f # accepted
brc 4,4f # status stored: next cpu
brc 2,2b # busy: try again
brc 1,4f # not op: next cpu
3:
mvc 0(4,%r11),264(%r7) # copy prefix register to prefix array
ahi %r11,4 # next element in prefix array
clr %r11,%r12
je 5f # no more space in prefix array
4:
ahi %r8,1 # next cpu (r8 += 1)
cl %r8,.Llast_cpu-.LPG1(%r13) # is last possible cpu ?
jl 1b # jump if not last cpu
5:
lhi %r1,2 # mode 2 = esame (dump)
j 6f
.align 4
.Lipl_schib:
.rept 13
.long 0
.endr
.nodump:
lhi %r1,1 # mode 1 = esame (normal ipl)
6:
#else
lhi %r1,1 # mode 1 = esame (normal ipl)
#endif /* CONFIG_ZFCPDUMP */
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
#
# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
# and create a kernel NSS if the SAVESYS= parm is defined
#
brasl %r14,startup_init
# set program check new psw mask
mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
larl %r12,machine_flags
#
# 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
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:
#
# find out if we have the IDTE instruction
#
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)
lhi %r1,2048
lhi %r2,0
.long 0xb98e2001
oi 7(%r12),0x80 # set IDTE flag
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
stg %r1,__LC_PGM_NEW_PSW+8
.short 0xc800 # mvcos 0(%r0),0(%r0),%r0
.short 0x0000
.short 0x0000
0: tm 0x8f,0x13 # special-operation exception?
bno 1f-.LPG1(%r13) # if yes, MVCOS is present
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 .Lduct # 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
.Lpcmsk:.quad 0x0000000180000000
.L4malign:.quad 0xffffffffffc00000
.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
.Lnop: .long 0x07000700
#ifdef CONFIG_ZFCPDUMP
.Lcurrent_cpu:
.long 0x0
.Llast_cpu:
.long 0x0000ffff
.Lpref_arr_ptr:
.long zfcpdump_prefix_array
#endif /* CONFIG_ZFCPDUMP */
.Lparmaddr:
.quad PARMAREA
.align 64
.Lduct: .long 0,0,0,0,.Lduald,0,0,0
.long 0,0,0,0,0,0,0,0
.align 128
.Lduald:.rept 8
.long 0x80000000,0,0,0 # invalid access-list entries
.endr
.org 0x12000
.globl _ehead
_ehead:
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif
#
# startup-code, running in absolute addressing mode
#
.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)
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
.align 8
.Ldw: .quad 0x0002000180000000,0x0000000000000000
.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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