Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 000000000000..b804c55bd919
--- /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
+