114 lines
3.0 KiB
ArmAsm
114 lines
3.0 KiB
ArmAsm
/*
|
|
* arch/s390/kernel/head31.S
|
|
*
|
|
* Copyright (C) IBM Corp. 2005,2010
|
|
*
|
|
* 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>
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/page.h>
|
|
|
|
__HEAD
|
|
.globl startup_continue
|
|
startup_continue:
|
|
basr %r13,0 # get base
|
|
.LPG1:
|
|
|
|
l %r1,.Lbase_cc-.LPG1(%r13)
|
|
mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK
|
|
lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
|
|
l %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
|
|
# move IPL device to lowcore
|
|
#
|
|
# Setup stack
|
|
#
|
|
l %r15,.Linittu-.LPG1(%r13)
|
|
st %r15,__LC_THREAD_INFO # cache thread info in lowcore
|
|
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
|
|
ahi %r15,-96
|
|
#
|
|
# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
|
|
# and create a kernel NSS if the SAVESYS= parm is defined
|
|
#
|
|
l %r14,.Lstartup_init-.LPG1(%r13)
|
|
basr %r14,%r14
|
|
lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
|
|
# virtual and never return ...
|
|
.align 8
|
|
.Lentry:.long 0x00080000,0x80000000 + _stext
|
|
.Lctl: .long 0x04b50002 # cr0: various things
|
|
.long 0 # cr1: primary space segment table
|
|
.long .Lduct # cr2: dispatchable unit control table
|
|
.long 0 # cr3: instruction authorization
|
|
.long 0 # cr4: instruction authorization
|
|
.long .Lduct # cr5: primary-aste origin
|
|
.long 0 # cr6: I/O interrupts
|
|
.long 0 # cr7: secondary space segment table
|
|
.long 0 # cr8: access registers translation
|
|
.long 0 # cr9: tracing off
|
|
.long 0 # cr10: tracing off
|
|
.long 0 # cr11: tracing off
|
|
.long 0 # cr12: tracing off
|
|
.long 0 # cr13: home space segment table
|
|
.long 0xc0000000 # cr14: machine check handling off
|
|
.long 0 # cr15: linkage stack operations
|
|
.Lmchunk:.long memory_chunk
|
|
.Lbss_bgn: .long __bss_start
|
|
.Lbss_end: .long _end
|
|
.Lparmaddr: .long PARMAREA
|
|
.Linittu: .long init_thread_union
|
|
.Lstartup_init:
|
|
.long startup_init
|
|
.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
|
|
.Lbase_cc:
|
|
.long sched_clock_base_cc
|
|
|
|
.globl _ehead
|
|
_ehead:
|
|
|
|
#ifdef CONFIG_SHARED_KERNEL
|
|
.org 0x100000 - 0x11000 # head.o ends at 0x11000
|
|
#endif
|
|
|
|
#
|
|
# startup-code, running in absolute addressing mode
|
|
#
|
|
.globl _stext
|
|
_stext: basr %r13,0 # get base
|
|
.LPG3:
|
|
# check control registers
|
|
stctl %c0,%c15,0(%r15)
|
|
oi 2(%r15),0x40 # enable sigp emergency signal
|
|
oi 0(%r15),0x10 # switch on low address protection
|
|
lctl %c0,%c15,0(%r15)
|
|
|
|
#
|
|
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
|
|
#
|
|
basr %r13,0
|
|
lpsw .Ldw-.(%r13) # load disabled wait psw
|
|
#
|
|
.align 8
|
|
.Ldw: .long 0x000a0000,0x00000000
|
|
.Lstart:.long start_kernel
|
|
.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|