/* * arch/s390/kernel/head64.S * * Copyright (C) IBM Corp. 1999,2006 * * Author(s): Hartmut Penner * Martin Schwidefsky * Rob van der Heij * Heiko Carstens * */ # # 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 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