| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright 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> |
| * |
| * 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) |
| * |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/page.h> |
| #include <asm/ptrace.h> |
| #include <asm/sclp.h> |
| #include "boot.h" |
| |
| #define EP_OFFSET 0x10008 |
| #define EP_STRING "S390EP" |
| #define IPL_BS 0x730 |
| |
| __HEAD |
| ipl_start: |
| mvi __LC_AR_MODE_ID,1 # set esame flag |
| slr %r0,%r0 # set cpuid to zero |
| lhi %r1,2 # mode 2 = esame (dump) |
| sigp %r1,%r0,0x12 # switch to esame mode |
| sam64 # switch to 64 bit addressing mode |
| lgh %r1,__LC_SUBCHANNEL_ID # test if subchannel number |
| brctg %r1,.Lnoload # is valid |
| llgf %r1,__LC_SUBCHANNEL_ID # load ipl subchannel number |
| lghi %r2,IPL_BS # load start address |
| bras %r14,.Lloader # load rest of ipl image |
| larl %r12,parmarea # pointer to parameter area |
| stg %r1,IPL_DEVICE-PARMAREA(%r12) # save ipl device number |
| # |
| # load parameter file from ipl device |
| # |
| .Lagain1: |
| larl %r2,_end # ramdisk loc. is temp |
| bras %r14,.Lloader # load parameter file |
| ltgr %r2,%r2 # got anything ? |
| jz .Lnopf |
| lg %r3,MAX_COMMAND_LINE_SIZE-PARMAREA(%r12) |
| aghi %r3,-1 |
| clgr %r2,%r3 |
| jl .Lnotrunc |
| lgr %r2,%r3 |
| .Lnotrunc: |
| larl %r4,_end |
| larl %r13,.L_hdr |
| clc 0(3,%r4),0(%r13) # if it is HDRx |
| jz .Lagain1 # skip dataset header |
| larl %r13,.L_eof |
| clc 0(3,%r4),0(%r13) # if it is EOFx |
| jz .Lagain1 # skip data set trailer |
| lgr %r5,%r2 |
| la %r6,COMMAND_LINE-PARMAREA(%r12) |
| lgr %r7,%r2 |
| aghi %r7,1 |
| mvcl %r6,%r4 |
| .Lnopf: |
| # |
| # load ramdisk from ipl device |
| # |
| .Lagain2: |
| larl %r2,_end # addr of ramdisk |
| stg %r2,INITRD_START-PARMAREA(%r12) |
| bras %r14,.Lloader # load ramdisk |
| stg %r2,INITRD_SIZE-PARMAREA(%r12) # store size of rd |
| ltgr %r2,%r2 |
| jnz .Lrdcont |
| stg %r2,INITRD_START-PARMAREA(%r12) # no ramdisk found |
| .Lrdcont: |
| larl %r2,_end |
| larl %r13,.L_hdr # skip HDRx and EOFx |
| clc 0(3,%r2),0(%r13) |
| jz .Lagain2 |
| larl %r13,.L_eof |
| clc 0(3,%r2),0(%r13) |
| jz .Lagain2 |
| # |
| # reset files in VM reader |
| # |
| larl %r13,.Lcpuid |
| stidp 0(%r13) # store cpuid |
| tm 0(%r13),0xff # running VM ? |
| jno .Lnoreset |
| larl %r2,.Lreset |
| lghi %r3,26 |
| diag %r2,%r3,8 |
| larl %r5,.Lirb |
| stsch 0(%r5) # check if irq is pending |
| tm 30(%r5),0x0f # by verifying if any of the |
| jnz .Lwaitforirq # activity or status control |
| tm 31(%r5),0xff # bits is set in the schib |
| jz .Lnoreset |
| .Lwaitforirq: |
| bras %r14,.Lirqwait # wait for IO interrupt |
| c %r1,__LC_SUBCHANNEL_ID # compare subchannel number |
| jne .Lwaitforirq |
| larl %r5,.Lirb |
| tsch 0(%r5) |
| .Lnoreset: |
| j .Lnoload |
| # |
| # everything loaded, go for it |
| # |
| .Lnoload: |
| jg startup |
| # |
| # subroutine to wait for end I/O |
| # |
| .Lirqwait: |
| larl %r13,.Lnewpswmask # set up IO interrupt psw |
| mvc __LC_IO_NEW_PSW(8),0(%r13) |
| stg %r14,__LC_IO_NEW_PSW+8 |
| larl %r13,.Lwaitpsw |
| lpswe 0(%r13) |
| .Lioint: |
| # |
| # subroutine for loading cards from the reader |
| # |
| .Lloader: |
| lgr %r4,%r14 |
| larl %r3,.Lorb # r2 = address of orb into r2 |
| larl %r5,.Lirb # r4 = address of irb |
| larl %r6,.Lccws |
| lghi %r7,20 |
| .Linit: |
| st %r2,4(%r6) # initialize CCW data addresses |
| la %r2,0x50(%r2) |
| la %r6,8(%r6) |
| brctg %r7,.Linit |
| larl %r13,.Lcr6 |
| lctlg %c6,%c6,0(%r13) |
| xgr %r2,%r2 |
| .Lldlp: |
| ssch 0(%r3) # load chunk of 1600 bytes |
| jnz .Llderr |
| .Lwait4irq: |
| bras %r14,.Lirqwait |
| c %r1,__LC_SUBCHANNEL_ID # compare subchannel number |
| jne .Lwait4irq |
| tsch 0(%r5) |
| xgr %r0,%r0 |
| ic %r0,8(%r5) # get device status |
| cghi %r0,8 # channel end ? |
| je .Lcont |
| cghi %r0,12 # channel end + device end ? |
| je .Lcont |
| llgf %r0,4(%r5) |
| sgf %r0,8(%r3) # r0/8 = number of ccws executed |
| mghi %r0,10 # *10 = number of bytes in ccws |
| llgh %r3,10(%r5) # get residual count |
| sgr %r0,%r3 # #ccws*80-residual=#bytes read |
| agr %r2,%r0 |
| br %r4 # r2 contains the total size |
| .Lcont: |
| aghi %r2,0x640 # add 0x640 to total size |
| larl %r6,.Lccws |
| lghi %r7,20 |
| .Lincr: |
| l %r0,4(%r6) # update CCW data addresses |
| aghi %r0,0x640 |
| st %r0,4(%r6) |
| aghi %r6,8 |
| brctg %r7,.Lincr |
| j .Lldlp |
| .Llderr: |
| larl %r13,.Lcrash |
| lpsw 0(%r13) |
| |
| .balign 8 |
| .Lwaitpsw: |
| .quad 0x0202000180000000,.Lioint |
| .Lnewpswmask: |
| .quad 0x0000000180000000 |
| .balign 8 |
| .Lorb: .long 0x00000000,0x0080ff00,.Lccws |
| .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 |
| .balign 8 |
| .Lcr6: .quad 0x00000000ff000000 |
| .balign 8 |
| .Lcrash:.long 0x000a0000,0x00000000 |
| .balign 8 |
| .Lccws: .rept 19 |
| .long 0x02600050,0x00000000 |
| .endr |
| .long 0x02200050,0x00000000 |
| .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' */ |
| .balign 8 |
| .Lcpuid:.fill 8,1,0 |
| |
| # |
| # normal startup-code, running in absolute addressing mode |
| # this is called either by the ipl loader or directly by PSW restart |
| # or linload or SALIPL |
| # |
| .org STARTUP_NORMAL_OFFSET - IPL_START |
| SYM_CODE_START(startup) |
| j startup_normal |
| .org EP_OFFSET - IPL_START |
| # |
| # This is a list of s390 kernel entry points. At address 0x1000f the number of |
| # valid entry points is stored. |
| # |
| # IMPORTANT: Do not change this table, it is s390 kernel ABI! |
| # |
| .ascii EP_STRING |
| .byte 0x00,0x01 |
| # |
| # kdump startup-code, running in 64 bit absolute addressing mode |
| # |
| .org STARTUP_KDUMP_OFFSET - IPL_START |
| j startup_kdump |
| SYM_CODE_END(startup) |
| SYM_CODE_START_LOCAL(startup_normal) |
| mvi __LC_AR_MODE_ID,1 # set esame flag |
| slr %r0,%r0 # set cpuid to zero |
| lhi %r1,2 # mode 2 = esame (dump) |
| sigp %r1,%r0,0x12 # switch to esame mode |
| bras %r13,0f |
| .fill 16,4,0x0 |
| 0: lmh %r0,%r15,0(%r13) # clear high-order half of gprs |
| sam64 # switch to 64 bit addressing mode |
| larl %r13,.Lext_new_psw |
| mvc __LC_EXT_NEW_PSW(16),0(%r13) |
| larl %r13,.Lpgm_new_psw |
| mvc __LC_PGM_NEW_PSW(16),0(%r13) |
| larl %r13,.Lio_new_psw |
| mvc __LC_IO_NEW_PSW(16),0(%r13) |
| xc 0x200(256),0x200 # partially clear lowcore |
| xc 0x300(256),0x300 |
| xc 0xe00(256),0xe00 |
| xc 0xf00(256),0xf00 |
| larl %r13,.Lctl |
| lctlg %c0,%c15,0(%r13) # load control registers |
| stcke __LC_BOOT_CLOCK |
| mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1 |
| larl %r13,6f |
| spt 0(%r13) |
| mvc __LC_LAST_UPDATE_TIMER(8),0(%r13) |
| larl %r15,_stack_end-STACK_FRAME_OVERHEAD |
| brasl %r14,sclp_early_setup_buffer |
| brasl %r14,verify_facilities |
| brasl %r14,startup_kernel |
| SYM_CODE_END(startup_normal) |
| |
| .balign 8 |
| 6: .long 0x7fffffff,0xffffffff |
| .Lext_new_psw: |
| .quad 0x0002000180000000,0x1b0 # disabled wait |
| .Lpgm_new_psw: |
| .quad 0x0000000180000000,startup_pgm_check_handler |
| .Lio_new_psw: |
| .quad 0x0002000180000000,0x1f0 # disabled wait |
| .Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space |
| .quad 0 # cr1: primary space segment table |
| .quad 0 # cr2: dispatchable unit control table |
| .quad 0 # cr3: instruction authorization |
| .quad 0xffff # cr4: instruction authorization |
| .quad 0 # cr5: primary-aste origin |
| .quad 0 # cr6: I/O interrupts |
| .quad 0 # cr7: secondary space segment table |
| .quad 0x0000000000008000 # 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 |
| |
| #include "head_kdump.S" |
| |
| # |
| # This program check is active immediately after kernel start |
| # and until early_pgm_check_handler is set in kernel/early.c |
| # It simply saves general/control registers and psw in |
| # the save area and does disabled wait with a faulty address. |
| # |
| SYM_CODE_START_LOCAL(startup_pgm_check_handler) |
| stmg %r8,%r15,__LC_SAVE_AREA |
| la %r8,4095 |
| stctg %c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r8) |
| stmg %r0,%r7,__LC_GPREGS_SAVE_AREA-4095(%r8) |
| mvc __LC_GPREGS_SAVE_AREA-4095+64(64,%r8),__LC_SAVE_AREA |
| mvc __LC_PSW_SAVE_AREA-4095(16,%r8),__LC_PGM_OLD_PSW |
| mvc __LC_RETURN_PSW(16),__LC_PGM_OLD_PSW |
| ni __LC_RETURN_PSW,0xfc # remove IO and EX bits |
| ni __LC_RETURN_PSW+1,0xfb # remove MCHK bit |
| oi __LC_RETURN_PSW+1,0x2 # set wait state bit |
| larl %r9,.Lold_psw_disabled_wait |
| stg %r9,__LC_PGM_NEW_PSW+8 |
| larl %r15,_dump_info_stack_end-STACK_FRAME_OVERHEAD |
| brasl %r14,print_pgm_check_info |
| .Lold_psw_disabled_wait: |
| la %r8,4095 |
| lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r8) |
| lpswe __LC_RETURN_PSW # disabled wait |
| SYM_CODE_END(startup_pgm_check_handler) |
