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Diffstat (limited to 'arch/s390/boot/head.S')
| -rw-r--r-- | arch/s390/boot/head.S | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S new file mode 100644 index 000000000..f721913b7 --- /dev/null +++ b/arch/s390/boot/head.S @@ -0,0 +1,340 @@ +/* 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> + * Heiko Carstens <heiko.carstens@de.ibm.com> + * + * 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/thread_info.h> +#include <asm/page.h> +#include <asm/ptrace.h> + +#define ARCH_OFFSET 4 + +__HEAD + +#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 0x200 = 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 0x200 + +# +# subroutine to wait for end I/O +# +.Lirqwait: + mvc __LC_IO_NEW_PSW(16),.Lnewpsw # set up IO interrupt psw + lpsw .Lwaitpsw +.Lioint: + br %r14 + .align 8 +.Lnewpsw: + .quad 0x0000000080000000,.Lioint +.Lwaitpsw: + .long 0x020a0000,0x80000000+.Lioint + +# +# subroutine for loading cards from the reader +# +.Lloader: + la %r4,0(%r14) + 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: + bas %r14,.Lirqwait + c %r1,__LC_SUBCHANNEL_ID # 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 %r4 # 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 + + .align 8 +.Lccws: .rept 19 + .long 0x02600050,0x00000000 + .endr + .long 0x02200050,0x00000000 + +iplstart: + 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 + sam31 # switch to 31 bit addressing mode + lh %r1,__LC_SUBCHANNEL_ID # test if subchannel number + bct %r1,.Lnoload # is valid + l %r1,__LC_SUBCHANNEL_ID # 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+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number + +# +# load parameter file from ipl device +# +.Lagain1: + l %r2,.Linitrd # ramdisk loc. is 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,.Linitrd + 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 + 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,.Linitrd # addr of ramdisk + st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) + bas %r14,.Lloader # load ramdisk + st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd + ltr %r2,%r2 + bnz .Lrdcont + st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found +.Lrdcont: + l %r2,.Linitrd + + clc 0(3,%r2),.L_hdr # skip HDRx and EOFx + bz .Lagain2 + clc 0(3,%r2),.L_eof + bz .Lagain2 + +# +# reset files in VM reader +# + stidp .Lcpuid # store cpuid + tm .Lcpuid,0xff # running VM ? + bno .Lnoreset + la %r2,.Lreset + lhi %r3,26 + diag %r2,%r3,8 + la %r5,.Lirb + stsch 0(%r5) # check if irq is pending + tm 30(%r5),0x0f # by verifying if any of the + bnz .Lwaitforirq # activity or status control + tm 31(%r5),0xff # bits is set in the schib + bz .Lnoreset +.Lwaitforirq: + bas %r14,.Lirqwait # wait for IO interrupt + c %r1,__LC_SUBCHANNEL_ID # compare subchannel number + bne .Lwaitforirq + la %r5,.Lirb + tsch 0(%r5) +.Lnoreset: + b .Lnoload + +# +# everything loaded, go for it +# +.Lnoload: + l %r1,.Lstartup + br %r1 + +.Linitrd:.long _end # default address of initrd +.Lparm: .long PARMAREA +.Lstartup: .long startup +.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' */ + .align 8 +.Lcpuid:.fill 8,1,0 + +# +# 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 +ENTRY(startup) + j .Lep_startup_normal + .org EP_OFFSET +# +# 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 at 0x10010, running in 64 bit absolute addressing mode +# + .org 0x10010 +ENTRY(startup_kdump) + j .Lep_startup_kdump +.Lep_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 + basr %r13,0 # get base +.LPG0: + xc 0x200(256),0x200 # partially clear lowcore + xc 0x300(256),0x300 + xc 0xe00(256),0xe00 + xc 0xf00(256),0xf00 + lctlg %c0,%c15,0x200(%r0) # initialize control registers + stcke __LC_BOOT_CLOCK + mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1 + spt 6f-.LPG0(%r13) + mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13) + l %r15,.Lstack-.LPG0(%r13) + ahi %r15,-STACK_FRAME_OVERHEAD + brasl %r14,verify_facilities +#ifdef CONFIG_KERNEL_UNCOMPRESSED + jg startup_continue +#else + jg startup_decompressor +#endif + +.Lstack: + .long 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER)) + .align 8 +6: .long 0x7fffffff,0xffffffff + +#include "head_kdump.S" + +# +# params at 10400 (setup.h) +# + .org PARMAREA + .long 0,0 # IPL_DEVICE + .long 0,0 # INITRD_START + .long 0,0 # INITRD_SIZE + .long 0,0 # OLDMEM_BASE + .long 0,0 # OLDMEM_SIZE + + .org COMMAND_LINE + .byte "root=/dev/ram0 ro" + .byte 0 + + .org 0x11000 |