mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
4bb5e07b68
Saves us more than 65k pointless IPIs. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
176 lines
4.7 KiB
ArmAsm
176 lines
4.7 KiB
ArmAsm
/*
|
|
* 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>
|
|
*
|
|
*/
|
|
|
|
.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)
|
|
chi %r8,MAX_CPU_ADDRESS # is last possible cpu ?
|
|
jle 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
|
|
lghi %r0,__LC_PASTE
|
|
stg %r0,__LC_VDSO_PER_CPU
|
|
#
|
|
# Setup stack
|
|
#
|
|
larl %r15,init_thread_union
|
|
stg %r15,__LC_THREAD_INFO # cache thread info in lowcore
|
|
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
|
|
#
|
|
# 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
|
|
lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
|
|
# virtual and never return ...
|
|
.align 16
|
|
.Lentry:.quad 0x0000000180000000,_stext
|
|
.Lctl: .quad 0x04350002 # 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
|
|
.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
|