| /* |
| * arch/s390/kernel/head64.S |
| * |
| * Copyright (C) IBM Corp. 1999,2010 |
| * |
| * 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: |
| larl %r1,sched_clock_base_cc |
| mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK |
| larl %r13,.LPG1 # get base |
| lmh %r0,%r15,.Lzero64-.LPG1(%r13) # clear high-order half |
| 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 |
| .LPG1: |
| .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 |
| .Lzero64:.fill 16,4,0x0 |
| .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 |
| |
| .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 |
