/* * arch/s390/kernel/head.S * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Hartmut Penner (hp@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com), * Rob van der Heij (rvdhei@iae.nl) * * There are 5 different IPL methods * 1) load the image directly into ram at address 0 and do an PSW restart * 2) linload will load the image from address 0x10000 to memory 0x10000 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated) * 3) generate the tape ipl header, store the generated image on a tape * and ipl from it * In case of SL tape you need to IPL 5 times to get past VOL1 etc * 4) generate the vm reader ipl header, move the generated image to the * VM reader (use option NOH!) and do a ipl from reader (VM only) * 5) direct call of start by the SALIPL loader * We use the cpuid to distinguish between VM and native ipl * params for kernel are pushed to 0x10400 (see setup.h) Changes: Okt 25 2000 added code to skip HDR and EOF to allow SL tape IPL (5 retries) changed first CCW from rewind to backspace block */ #include #include #include #ifndef CONFIG_IPL .org 0 .long 0x00080000,0x80000000+startup # Just a restart PSW #else #ifdef CONFIG_IPL_TAPE #define IPL_BS 1024 .org 0 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded .long 0x27000000,0x60000001 # by ipl to addresses 0-23. .long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs). .long 0x00000000,0x00000000 # external old psw .long 0x00000000,0x00000000 # svc old psw .long 0x00000000,0x00000000 # program check old psw .long 0x00000000,0x00000000 # machine check old psw .long 0x00000000,0x00000000 # io old psw .long 0x00000000,0x00000000 .long 0x00000000,0x00000000 .long 0x00000000,0x00000000 .long 0x000a0000,0x00000058 # external new psw .long 0x000a0000,0x00000060 # svc new psw .long 0x000a0000,0x00000068 # program check new psw .long 0x000a0000,0x00000070 # machine check new psw .long 0x00080000,0x80000000+.Lioint # io new psw .org 0x100 # # subroutine for loading from tape # Paramters: # R1 = device number # R2 = load address .Lloader: st %r14,.Lldret la %r3,.Lorbread # r3 = address of orb la %r5,.Lirb # r5 = address of irb st %r2,.Lccwread+4 # initialize CCW data addresses lctl %c6,%c6,.Lcr6 slr %r2,%r2 .Lldlp: la %r6,3 # 3 retries .Lssch: ssch 0(%r3) # load chunk of IPL_BS bytes bnz .Llderr .Lw4end: bas %r14,.Lwait4io tm 8(%r5),0x82 # do we have a problem ? bnz .Lrecov slr %r7,%r7 icm %r7,3,10(%r5) # get residual count lcr %r7,%r7 la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read ar %r2,%r7 # add to total size tm 8(%r5),0x01 # found a tape mark ? bnz .Ldone l %r0,.Lccwread+4 # update CCW data addresses ar %r0,%r7 st %r0,.Lccwread+4 b .Lldlp .Ldone: l %r14,.Lldret br %r14 # r2 contains the total size .Lrecov: bas %r14,.Lsense # do the sensing bct %r6,.Lssch # dec. retry count & branch b .Llderr # # Sense subroutine # .Lsense: st %r14,.Lsnsret la %r7,.Lorbsense ssch 0(%r7) # start sense command bnz .Llderr bas %r14,.Lwait4io l %r14,.Lsnsret tm 8(%r5),0x82 # do we have a problem ? bnz .Llderr br %r14 # # Wait for interrupt subroutine # .Lwait4io: lpsw .Lwaitpsw .Lioint: c %r1,0xb8 # compare subchannel number bne .Lwait4io tsch 0(%r5) slr %r0,%r0 tm 8(%r5),0x82 # do we have a problem ? bnz .Lwtexit tm 8(%r5),0x04 # got device end ? bz .Lwait4io .Lwtexit: br %r14 .Llderr: lpsw .Lcrash .align 8 .Lorbread: .long 0x00000000,0x0080ff00,.Lccwread .align 8 .Lorbsense: .long 0x00000000,0x0080ff00,.Lccwsense .align 8 .Lccwread: .long 0x02200000+IPL_BS,0x00000000 .Lccwsense: .long 0x04200001,0x00000000 .Lwaitpsw: .long 0x020a0000,0x80000000+.Lioint .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 .Lcr6: .long 0xff000000 .align 8 .Lcrash:.long 0x000a0000,0x00000000 .Lldret:.long 0 .Lsnsret: .long 0 #endif /* CONFIG_IPL_TAPE */ #ifdef CONFIG_IPL_VM #define IPL_BS 0x730 .org 0 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded .long 0x02000018,0x60000050 # by ipl to addresses 0-23. .long 0x02000068,0x60000050 # (a PSW and two CCWs). .fill 80-24,1,0x40 # bytes 24-79 are discarded !! .long 0x020000f0,0x60000050 # The next 160 byte are loaded .long 0x02000140,0x60000050 # to addresses 0x18-0xb7 .long 0x02000190,0x60000050 # They form the continuation .long 0x020001e0,0x60000050 # of the CCW program started .long 0x02000230,0x60000050 # by ipl and load the range .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730 .long 0x02000320,0x60000050 # in memory. At the end of .long 0x02000370,0x60000050 # the channel program the PSW .long 0x020003c0,0x60000050 # at location 0 is loaded. .long 0x02000410,0x60000050 # Initial processing starts .long 0x02000460,0x60000050 # at 0xf0 = iplstart. .long 0x020004b0,0x60000050 .long 0x02000500,0x60000050 .long 0x02000550,0x60000050 .long 0x020005a0,0x60000050 .long 0x020005f0,0x60000050 .long 0x02000640,0x60000050 .long 0x02000690,0x60000050 .long 0x020006e0,0x20000050 .org 0xf0 # # subroutine for loading cards from the reader # .Lloader: la %r3,.Lorb # r2 = address of orb into r2 la %r5,.Lirb # r4 = address of irb la %r6,.Lccws la %r7,20 .Linit: st %r2,4(%r6) # initialize CCW data addresses la %r2,0x50(%r2) la %r6,8(%r6) bct 7,.Linit lctl %c6,%c6,.Lcr6 # set IO subclass mask slr %r2,%r2 .Lldlp: ssch 0(%r3) # load chunk of 1600 bytes bnz .Llderr .Lwait4irq: mvc 0x78(8),.Lnewpsw # set up IO interrupt psw lpsw .Lwaitpsw .Lioint: c %r1,0xb8 # compare subchannel number bne .Lwait4irq tsch 0(%r5) slr %r0,%r0 ic %r0,8(%r5) # get device status chi %r0,8 # channel end ? be .Lcont chi %r0,12 # channel end + device end ? be .Lcont l %r0,4(%r5) s %r0,8(%r3) # r0/8 = number of ccws executed mhi %r0,10 # *10 = number of bytes in ccws lh %r3,10(%r5) # get residual count sr %r0,%r3 # #ccws*80-residual=#bytes read ar %r2,%r0 br %r14 # r2 contains the total size .Lcont: ahi %r2,0x640 # add 0x640 to total size la %r6,.Lccws la %r7,20 .Lincr: l %r0,4(%r6) # update CCW data addresses ahi %r0,0x640 st %r0,4(%r6) ahi %r6,8 bct 7,.Lincr b .Lldlp .Llderr: lpsw .Lcrash .align 8 .Lorb: .long 0x00000000,0x0080ff00,.Lccws .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 .Lcr6: .long 0xff000000 .Lloadp:.long 0,0 .align 8 .Lcrash:.long 0x000a0000,0x00000000 .Lnewpsw: .long 0x00080000,0x80000000+.Lioint .Lwaitpsw: .long 0x020a0000,0x80000000+.Lioint .align 8 .Lccws: .rept 19 .long 0x02600050,0x00000000 .endr .long 0x02200050,0x00000000 #endif /* CONFIG_IPL_VM */ iplstart: lh %r1,0xb8 # test if subchannel number bct %r1,.Lnoload # is valid l %r1,0xb8 # load ipl subchannel number la %r2,IPL_BS # load start address bas %r14,.Lloader # load rest of ipl image st %r1,__LC_IPLDEV # store ipl device number l %r12,.Lparm # pointer to parameter area # # load parameter file from ipl device # .Lagain1: l %r2,INITRD_START+4-PARMAREA(%r12)# use ramdisk location as temp bas %r14,.Lloader # load parameter file ltr %r2,%r2 # got anything ? bz .Lnopf chi %r2,895 bnh .Lnotrunc la %r2,895 .Lnotrunc: l %r4,INITRD_START+4-PARMAREA(%r12) clc 0(3,%r4),.L_hdr # if it is HDRx bz .Lagain1 # skip dataset header clc 0(3,%r4),.L_eof # if it is EOFx bz .Lagain1 # skip dateset trailer la %r5,0(%r4,%r2) lr %r3,%r2 .Lidebc: tm 0(%r5),0x80 # high order bit set ? bo .Ldocv # yes -> convert from EBCDIC ahi %r5,-1 bct %r3,.Lidebc b .Lnocv .Ldocv: l %r3,.Lcvtab tr 0(256,%r4),0(%r3) # convert parameters to ascii tr 256(256,%r4),0(%r3) tr 512(256,%r4),0(%r3) tr 768(122,%r4),0(%r3) .Lnocv: la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line mvc 0(256,%r3),0(%r4) mvc 256(256,%r3),256(%r4) mvc 512(256,%r3),512(%r4) mvc 768(122,%r3),768(%r4) slr %r0,%r0 b .Lcntlp .Ldelspc: ic %r0,0(%r3) ic %r0,0(%r2,%r3) chi %r0,0x20 # is it a space ? be .Lcntlp ahi %r2,1 b .Leolp .Lcntlp: brct %r2,.Ldelspc .Leolp: slr %r0,%r0 stc %r0,0(%r2,%r3) # terminate buffer .Lnopf: # # load ramdisk from ipl device # .Lagain2: l %r2,INITRD_START+4-PARMAREA(%r12)# load adr. of ramdisk bas %r14,.Lloader # load ramdisk st %r2,INITRD_SIZE+4-PARMAREA(%r12) # store size of ramdisk ltr %r2,%r2 bnz .Lrdcont st %r2,INITRD_START+4-PARMAREA(%r12)# no ramdisk found, null it .Lrdcont: l %r2,INITRD_START-PARMAREA(%r12) clc 0(3,%r2),.L_hdr # skip HDRx and EOFx bz .Lagain2 clc 0(3,%r2),.L_eof bz .Lagain2 #ifdef CONFIG_IPL_VM # # reset files in VM reader # stidp __LC_CPUID # store cpuid lh %r0,__LC_CPUID+4 # get cpu version chi %r0,0x7490 # running on P/390 ? be start # no -> skip reset la %r2,.Lreset lhi %r3,26 .long 0x83230008 #endif # # everything loaded, go for it # .Lnoload: l %r1,.Lstartup br %r1 .Lparm: .long PARMAREA .Lstartup: .long startup .Lcvtab:.long _ebcasc # ebcdic to ascii table .Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold" .L_eof: .long 0xc5d6c600 /* C'EOF' */ .L_hdr: .long 0xc8c4d900 /* C'HDR' */ #endif /* CONFIG_IPL */ # # SALIPL loader support. Based on a patch by Rob van der Heij. # This entry point is called directly from the SALIPL loader and # doesn't need a builtin ipl record. # .org 0x800 .globl start start: stm %r0,%r15,0x07b0 # store registers basr %r12,%r0 .base: l %r11,.parm l %r8,.cmd # pointer to command buffer ltr %r9,%r9 # do we have SALIPL parameters? bp .sk8x8 mvc 0(64,%r8),0x00b0 # copy saved registers xc 64(240-64,%r8),0(%r8) # remainder of buffer tr 0(64,%r8),.lowcase b .gotr .sk8x8: mvc 0(240,%r8),0(%r9) # copy iplparms into buffer .gotr: l %r10,.tbl # EBCDIC to ASCII table tr 0(240,%r8),0(%r10) stidp __LC_CPUID # Are we running on VM maybe cli __LC_CPUID,0xff bnz .test .long 0x83300060 # diag 3,0,x'0060' - storage size b .done .test: mvc 0x68(8),.pgmnw # set up pgm check handler l %r2,.fourmeg lr %r3,%r2 bctr %r3,%r0 # 4M-1 .loop: iske %r0,%r3 ar %r3,%r2 .pgmx: sr %r3,%r2 la %r3,1(%r3) .done: st %r3,MEMORY_SIZE-PARMAREA(%r11) slr %r0,%r0 st %r0,INITRD_SIZE-PARMAREA(%r11) st %r0,INITRD_START-PARMAREA(%r11) j startup # continue with startup .tbl: .long _ebcasc # translate table .cmd: .long COMMAND_LINE # address of command line buffer .parm: .long PARMAREA .fourmeg: .long 0x00400000 # 4M .pgmnw: .long 0x00080000,.pgmx .lowcase: .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07 .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17 .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37 .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47 .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57 .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67 .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77 .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87 .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97 .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7 .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7 .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff # # startup-code at 0x10000, running in real 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 .LPG1: n %r13,.Lhighoff-.LPG1(%r13) # remove high order bit lhi %r1,1 # mode 1 = esame 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,.Lparm1-.LPG1(%r13) # pointer to parameter area # # find out memory size. # mvc 0x1d0(16),.Lpcmem-.LPG1(%r13) # setup program check handler lghi %r2,1 sllg %r2,%r2,17 # test in increments of 128KB lgr %r1,%r2 aghi %r1,-8 # test last word in the segment .Lloop: lg %r0,0(%r1) # test 128KB segment stg %r0,0(%r1) agr %r1,%r2 # add 128KB bno .Lloop-.LPG1(%r13) # r1 < 0x80000000 -> loop .Lchkmem: ng %r1,.L4malign-.LPG1(%r13) # align to multiples of 4M stg %r1,MEMORY_SIZE-PARMAREA(%r12) # store memory size # # find out if we are running under VM # stidp __LC_CPUID # store cpuid tm __LC_CPUID,0xff # running under VM ? bno .Lnovm-.LPG1(%r13) oi MACHINE_FLAGS+7-PARMAREA(%r12),1 # set VM flag .Lnovm: lh %r0,__LC_CPUID+4 # get cpu version chi %r0,0x7490 # running on a P/390 ? bne .Lnop390-.LPG1(%r13) oi MACHINE_FLAGS+7-PARMAREA(%r12),4 # set P/390 flag .Lnop390: 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 0 # cr2: access register translation .quad 0 # cr3: instruction authorization .quad 0 # cr4: instruction authorization .quad 0 # cr5: various things .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 .Lpcmem:.quad 0x0000000180000000,.Lchkmem .Lflt0: .double 0 .Lparm1:.quad PARMAREA .Lhighoff:.long 0x7fffffff .L4malign:.quad 0xffffffffffc00000 .Lbigmem:.quad 0x04000000 .Lmaxchunk:.quad 0x00ffffff # # params at 10400 (setup.h) # .org PARMAREA .quad 0x0100 # ORIG_ROOT_DEV: ramdisk major/minor .word 0 # MOUNT_ROOT_RDONLY: no .quad 0 # MEMORY_SIZE .quad 0 # MACHINE_FLAGS (bit 0:VM) .quad RAMDISK_ORIGIN # INITRD_START .quad RAMDISK_SIZE # INITRD_SIZE .word 0 # RAMDISK_FLAGS .org COMMAND_LINE .byte "root=/dev/ram0 ro" .byte 0 # # startup-code, running in virtual mode # .org 0x10800 .globl _stext _stext: basr %r13,0 # get base .LPG2: # # Setup lowcore # l %r1,__LC_IPLDEV # load ipl device number spx .Lprefix-.LPG2(%r13) # set prefix to linux lowcore st %r1,__LC_IPLDEV # store ipl device number lg %r15,.Linittu-.LPG2(%r13) aghi %r15,16384 # init_task_union + 16384 stg %r15,__LC_KERNEL_STACK # set end of kernel stack aghi %r15,-160 xc 0(8,%r15),0(%r15) # set backchain to zero lghi %r0,-1 stg %r0,__LC_KERNEL_LEVEL # set interrupt count to -1 # # clear bss memory # lg %r2,.Lbss_bgn-.LPG2(%r13) # start of bss lg %r3,.Lbss_end-.LPG2(%r13) # end of bss sgr %r3,%r2 # length of bss sgr %r4,%r4 # sgr %r5,%r5 # set src,length and pad to zero mvcle %r2,%r4,0 # clear mem jo .-4 # branch back, if not finish # check control registers stctg %c0,%c15,0(%r15) oc 6(1,%r15),.Locbits+5-.LPG2(%r13) # enable sigp external ints. oc 4(1,%r15),.Locbits+4-.LPG2(%r13) # low addresss proctection lctlg %c0,%c15,0(%r15) # lam 0,15,.Laregs-.LPG2(%r13) # load access regs 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 # .Lstart: .quad start_kernel .align 8 .Lprefix: .long init_S390_lowcore .Linittu: .quad init_task_union .Lbss_bgn: .quad __bss_start .Lbss_end: .quad _end .Locbits: .quad 0x0102040810204080 .align 4 .Laregs: .long 0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0 .align 8 .Ldw: .quad 0x0002000180000000,0x0000000000000000