diff options
Diffstat (limited to 'arch/s390/kernel/head.S')
| -rw-r--r-- | arch/s390/kernel/head.S | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S new file mode 100644 index 0000000..b804c55 --- /dev/null +++ b/arch/s390/kernel/head.S @@ -0,0 +1,772 @@ +/* + * 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 <rvdheij@iae.nl> + added code to skip HDR and EOF to allow SL tape IPL (5 retries) + changed first CCW from rewind to backspace block + + */ + +#include <linux/config.h> +#include <asm/setup.h> +#include <asm/lowcore.h> +#include <asm/offsets.h> +#include <asm/thread_info.h> +#include <asm/page.h> + +#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 __LC_IO_NEW_PSW(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 + l %r12,.Lparm # pointer to parameter area + st %r1,IPL_DEVICE-PARMAREA(%r12) # store ipl device number + +# +# load parameter file from ipl device +# +.Lagain1: + l %r2,INITRD_START-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-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(%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-PARMAREA(%r12) # load adr. of ramdisk + bas %r14,.Lloader # load ramdisk + st %r2,INITRD_SIZE-PARMAREA(%r12) # store size of ramdisk + ltr %r2,%r2 + bnz .Lrdcont + st %r2,INITRD_START-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 + tm __LC_CPUID,0xff # running VM ? + bno .Lnoreset + la %r2,.Lreset + lhi %r3,26 + .long 0x83230008 +.Lnoreset: +#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: + l %r1,.memsize + st %r3,0(%r1) + 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 +.memsize: .long memory_size +.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: lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers + la %r12,_pstart-.LPG1(%r13) # pointer to parameter area + # move IPL device to lowcore + mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12) + +# +# clear bss memory +# + l %r2,.Lbss_bgn-.LPG1(%r13) # start of bss + l %r3,.Lbss_end-.LPG1(%r13) # end of bss + sr %r3,%r2 # length of bss + sr %r4,%r4 # + sr %r5,%r5 # set src,length and pad to zero + sr %r0,%r0 # + mvcle %r2,%r4,0 # clear mem + jo .-4 # branch back, if not finish + + l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word +.Lservicecall: + stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts + + stctl %r0, %r0,.Lcr-.LPG1(%r13) # get cr0 + la %r1,0x200 # set bit 22 + o %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1 + st %r1,.Lcr-.LPG1(%r13) + lctl %r0, %r0,.Lcr-.LPG1(%r13) # load modified cr0 + + mvc __LC_EXT_NEW_PSW(8),.Lpcext-.LPG1(%r13) # set postcall psw + la %r1, .Lsclph-.LPG1(%r13) + a %r1,__LC_EXT_NEW_PSW+4 # set handler + st %r1,__LC_EXT_NEW_PSW+4 + + la %r4,_pstart-.LPG1(%r13) # %r4 is our index for sccb stuff + la %r1, .Lsccb-PARMAREA(%r4) # our sccb + .insn rre,0xb2200000,%r2,%r1 # service call + ipm %r1 + srl %r1,28 # get cc code + xr %r3, %r3 + chi %r1,3 + be .Lfchunk-.LPG1(%r13) # leave + chi %r1,2 + be .Lservicecall-.LPG1(%r13) + lpsw .Lwaitsclp-.LPG1(%r13) +.Lsclph: + lh %r1,.Lsccbr-PARMAREA(%r4) + chi %r1,0x10 # 0x0010 is the sucess code + je .Lprocsccb # let's process the sccb + chi %r1,0x1f0 + bne .Lfchunk-.LPG1(%r13) # unhandled error code + c %r2, .Lrcp-.LPG1(%r13) # Did we try Read SCP forced + bne .Lfchunk-.LPG1(%r13) # if no, give up + l %r2, .Lrcp2-.LPG1(%r13) # try with Read SCP + b .Lservicecall-.LPG1(%r13) +.Lprocsccb: + lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0 + chi %r1,0x00 + jne .Lscnd + l %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one +.Lscnd: + xr %r3,%r3 # same logic + ic %r3,.Lscpa1-PARMAREA(%r4) + chi %r3,0x00 + jne .Lcompmem + l %r3,.Lscpa2-PARMAREA(%r13) +.Lcompmem: + mr %r2,%r1 # mem in MB on 128-bit + l %r1,.Lonemb-.LPG1(%r13) + mr %r2,%r1 # mem size in bytes in %r3 + b .Lfchunk-.LPG1(%r13) + +.Lpmask: + .byte 0 +.align 8 +.Lpcext:.long 0x00080000,0x80000000 +.Lcr: + .long 0x00 # place holder for cr0 +.Lwaitsclp: + .long 0x020A0000 + .long .Lsclph +.Lrcp: + .int 0x00120001 # Read SCP forced code +.Lrcp2: + .int 0x00020001 # Read SCP code +.Lonemb: + .int 0x100000 +.Lfchunk: + +# +# find memory chunks. +# + lr %r9,%r3 # end of mem + mvc __LC_PGM_NEW_PSW(8),.Lpcmem-.LPG1(%r13) + la %r1,1 # test in increments of 128KB + sll %r1,17 + l %r3,.Lmchunk-.LPG1(%r13) # get pointer to memory_chunk array + slr %r4,%r4 # set start of chunk to zero + slr %r5,%r5 # set end of chunk to zero + slr %r6,%r6 # set access code to zero + la %r10, MEMORY_CHUNKS # number of chunks +.Lloop: + tprot 0(%r5),0 # test protection of first byte + ipm %r7 + srl %r7,28 + clr %r6,%r7 # compare cc with last access code + be .Lsame-.LPG1(%r13) + b .Lchkmem-.LPG1(%r13) +.Lsame: + ar %r5,%r1 # add 128KB to end of chunk + bno .Lloop-.LPG1(%r13) # r1 < 0x80000000 -> loop +.Lchkmem: # > 2GB or tprot got a program check + clr %r4,%r5 # chunk size > 0? + be .Lchkloop-.LPG1(%r13) + st %r4,0(%r3) # store start address of chunk + lr %r0,%r5 + slr %r0,%r4 + st %r0,4(%r3) # store size of chunk + st %r6,8(%r3) # store type of chunk + la %r3,12(%r3) + l %r4,.Lmemsize-.LPG1(%r13) # address of variable memory_size + st %r5,0(%r4) # store last end to memory size + ahi %r10,-1 # update chunk number +.Lchkloop: + lr %r6,%r7 # set access code to last cc + # we got an exception or we're starting a new + # chunk , we must check if we should + # still try to find valid memory (if we detected + # the amount of available storage), and if we + # have chunks left + xr %r0,%r0 + clr %r0,%r9 # did we detect memory? + je .Ldonemem # if not, leave + chi %r10,0 # do we have chunks left? + je .Ldonemem + alr %r5,%r1 # add 128KB to end of chunk + lr %r4,%r5 # potential new chunk + clr %r5,%r9 # should we go on? + jl .Lloop +.Ldonemem: + l %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags +# +# 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 3(%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 3(%r12),4 # set P/390 flag +.Lnop390: + +# +# find out if we have an IEEE fpu +# + mvc __LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13) + efpc %r0,0 # test IEEE extract fpc instruction + oi 3(%r12),2 # set IEEE fpu flag +.Lchkfpu: + +# +# find out if we have the CSP instruction +# + mvc __LC_PGM_NEW_PSW(8),.Lpccsp-.LPG1(%r13) + la %r0,0 + lr %r1,%r0 + la %r2,4 + csp %r0,%r2 # Test CSP instruction + oi 3(%r12),8 # set CSP flag +.Lchkcsp: + +# +# find out if we have the MVPG instruction +# + mvc __LC_PGM_NEW_PSW(8),.Lpcmvpg-.LPG1(%r13) + sr %r0,%r0 + la %r1,0 + la %r2,0 + mvpg %r1,%r2 # Test CSP instruction + oi 3(%r12),16 # set MVPG flag +.Lchkmvpg: + +# +# find out if we have the IDTE instruction +# + mvc __LC_PGM_NEW_PSW(8),.Lpcidte-.LPG1(%r13) + .long 0xb2b10000 # store facility list + tm 0xc8,0x08 # check bit for clearing-by-ASCE + bno .Lchkidte-.LPG1(%r13) + lhi %r1,2094 + lhi %r2,0 + .long 0xb98e2001 + oi 3(%r12),0x80 # set IDTE flag +.Lchkidte: + + 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 0xffffffff # 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 +.Lpcmem:.long 0x00080000,0x80000000 + .Lchkmem +.Lpcfpu:.long 0x00080000,0x80000000 + .Lchkfpu +.Lpccsp:.long 0x00080000,0x80000000 + .Lchkcsp +.Lpcmvpg:.long 0x00080000,0x80000000 + .Lchkmvpg +.Lpcidte:.long 0x00080000,0x80000000 + .Lchkidte +.Lmemsize:.long memory_size +.Lmchunk:.long memory_chunk +.Lmflags:.long machine_flags +.Lbss_bgn: .long __bss_start +.Lbss_end: .long _end + + .org PARMAREA-64 +.Lduct: .long 0,0,0,0,0,0,0,0 + .long 0,0,0,0,0,0,0,0 + +# +# params at 10400 (setup.h) +# + .org PARMAREA + .global _pstart +_pstart: + .long 0,0 # IPL_DEVICE + .long 0,RAMDISK_ORIGIN # INITRD_START + .long 0,RAMDISK_SIZE # INITRD_SIZE + + .org COMMAND_LINE + .byte "root=/dev/ram0 ro" + .byte 0 + .org 0x11000 +.Lsccb: + .hword 0x1000 # length, one page + .byte 0x00,0x00,0x00 + .byte 0x80 # variable response bit set +.Lsccbr: + .hword 0x00 # response code +.Lscpincr1: + .hword 0x00 +.Lscpa1: + .byte 0x00 + .fill 89,1,0 +.Lscpa2: + .int 0x00 +.Lscpincr2: + .quad 0x00 + .fill 3984,1,0 + .org 0x12000 + .global _pend +_pend: + +#ifdef CONFIG_SHARED_KERNEL + .org 0x100000 +#endif + +# +# startup-code, running in virtual mode +# + .globl _stext +_stext: basr %r13,0 # get base +.LPG2: +# +# Setup stack +# + l %r15,.Linittu-.LPG2(%r13) + 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 + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain + +# check control registers + stctl %c0,%c15,0(%r15) + oi 2(%r15),0x20 # enable sigp external interrupts + oi 0(%r15),0x10 # switch on low address protection + lctl %c0,%c15,0(%r15) + +# + lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess + l %r14,.Lstart-.LPG2(%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 +.Linittu: .long init_thread_union +.Lstart: .long start_kernel +.Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 + |