Linux-2.6.12-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, 769 insertions, 0 deletions

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
new file mode 100644
index 000000000000..8366793bc371
--- /dev/null
+++ b/arch/s390/kernel/head64.S
@@ -0,0 +1,769 @@
+/*
+ *  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   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
+        larl  %r12,_pstart                     # pointer to parameter area
+        st    %r1,IPL_DEVICE+4-PARMAREA(%r12)  # store ipl device number
+
+#
+# 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(%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+4-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
+
+.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    %r3,4(%r1)
+	slr   %r0,%r0
+	st    %r0,INITRD_SIZE+4-PARMAREA(%r11)
+	st    %r0,INITRD_START+4-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
+.memsize: .long memory_size
+.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:  sll   %r13,1                     # remove high order bit
+        srl   %r13,1
+        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
+	larl  %r12,_pstart               # pointer to parameter area
+					 # move IPL device to lowcore
+        mvc   __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
+
+#
+# clear bss memory
+#
+	larl  %r2,__bss_start           # start of bss segment
+        larl  %r3,_end                  # end of bss segment
+        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
+
+	l     %r2,.Lrcp-.LPG1(%r13)	# Read SCP forced command word
+.Lservicecall:
+	stosm .Lpmask-.LPG1(%r13),0x01	# authorize ext interrupts
+
+	stctg %r0,%r0,.Lcr-.LPG1(%r13)	# get cr0
+	la    %r1,0x200			# set bit 22
+	og    %r1,.Lcr-.LPG1(%r13)	# or old cr0 with r1
+	stg   %r1,.Lcr-.LPG1(%r13)
+	lctlg %r0,%r0,.Lcr-.LPG1(%r13)	# load modified cr0
+
+	mvc   __LC_EXT_NEW_PSW(8),.Lpcmsk-.LPG1(%r13) # set postcall psw
+	larl  %r1,.Lsclph
+	stg   %r1,__LC_EXT_NEW_PSW+8	# set handler
+
+	larl  %r4,_pstart		# %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
+	lg    %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:
+	mlgr  %r2,%r1			# mem in MB on 128-bit
+	l     %r1,.Lonemb-.LPG1(%r13)
+	mlgr  %r2,%r1			# mem size in bytes in %r3
+	b     .Lfchunk-.LPG1(%r13)
+
+.Lpmask:
+	.byte 0
+	.align 8
+.Lcr:
+	.quad 0x00  # place holder for cr0
+.Lwaitsclp:
+	.long 0x020A0000
+	.quad .Lsclph
+.Lrcp:
+	.int 0x00120001 # Read SCP forced code
+.Lrcp2:
+	.int 0x00020001 # Read SCP code
+.Lonemb:
+	.int 0x100000
+
+.Lfchunk:
+					 # set program check new psw mask
+	mvc   __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
+
+#
+# find memory chunks.
+#
+	lgr   %r9,%r3			 # end of mem
+	larl  %r1,.Lchkmem               # set program check address
+	stg   %r1,__LC_PGM_NEW_PSW+8
+	la    %r1,1                      # test in increments of 128KB
+	sllg  %r1,%r1,17
+	larl  %r3,memory_chunk
+	slgr  %r4,%r4                    # set start of chunk to zero
+	slgr  %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
+	je    .Lsame
+	j     .Lchkmem
+.Lsame:
+	algr  %r5,%r1			 # add 128KB to end of chunk
+					 # no need to check here,
+	brc   12,.Lloop			 # this is the same chunk
+.Lchkmem:				 # > 16EB or tprot got a program check
+	clgr  %r4,%r5			 # chunk size > 0?
+	je    .Lchkloop
+	stg   %r4,0(%r3)		 # store start address of chunk
+	lgr   %r0,%r5
+	slgr  %r0,%r4
+	stg   %r0,8(%r3)		 # store size of chunk
+	st    %r6,20(%r3)		 # store type of chunk
+	la    %r3,24(%r3)
+	larl  %r8,memory_size
+	stg   %r5,0(%r8)                 # store 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
+	lghi  %r4,1
+	sllg  %r4,%r4,31
+	clgr  %r5,%r4
+	je    .Lhsaskip
+	xr    %r0, %r0
+	clgr  %r0, %r9			 # did we detect memory?
+	je    .Ldonemem			 # if not, leave
+	chi   %r10, 0			 # do we have chunks left?
+	je    .Ldonemem
+.Lhsaskip:
+	algr  %r5,%r1			 # add 128KB to end of chunk
+	lgr   %r4,%r5			 # potential new chunk
+	clgr  %r5,%r9			 # should we go on?
+	jl    .Lloop
+.Ldonemem:		
+
+	larl  %r12,machine_flags
+#
+# find out if we are running under VM
+#
+        stidp  __LC_CPUID               # store cpuid
+	tm     __LC_CPUID,0xff          # running under VM ?
+	bno    0f-.LPG1(%r13)
+        oi     7(%r12),1                # set VM flag
+0:      lh     %r0,__LC_CPUID+4         # get cpu version
+        chi    %r0,0x7490               # running on a P/390 ?
+        bne    1f-.LPG1(%r13)
+        oi     7(%r12),4                # set P/390 flag
+1:
+
+#
+# find out if we have the MVPG instruction
+#
+	la     %r1,0f-.LPG1(%r13)       # set program check address
+	stg    %r1,__LC_PGM_NEW_PSW+8
+	sgr    %r0,%r0
+	lghi   %r1,0
+	lghi   %r2,0
+	mvpg   %r1,%r2                  # test MVPG instruction
+	oi     7(%r12),16               # set MVPG flag
+0:
+
+#
+# find out if the diag 0x44 works in 64 bit mode
+#
+	la     %r1,0f-.LPG1(%r13)	# set program check address
+	stg    %r1,__LC_PGM_NEW_PSW+8
+	mvc    __LC_DIAG44_OPCODE(8),.Lnop-.LPG1(%r13)
+	diag   0,0,0x44			# test diag 0x44
+	oi     7(%r12),32		# set diag44 flag
+	mvc    __LC_DIAG44_OPCODE(8),.Ldiag44-.LPG1(%r13)
+0:	
+
+#
+# find out if we have the IDTE instruction
+#
+	la     %r1,0f-.LPG1(%r13)	# set program check address
+	stg    %r1,__LC_PGM_NEW_PSW+8
+	.long	0xb2b10000		# store facility list
+	tm	0xc8,0x08		# check bit for clearing-by-ASCE
+	bno	0f-.LPG1(%r13)
+	lhi	%r1,2094
+	lhi	%r2,0
+	.long	0xb98e2001
+	oi	7(%r12),0x80		# set IDTE flag
+0:
+
+        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  .Lduct                   # cr2: dispatchable unit control table
+        .quad  0                        # cr3: instruction authorization
+        .quad  0                        # cr4: instruction authorization
+        .quad  0xffffffffffffffff       # cr5: primary-aste origin
+        .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
+.Lpcmsk:.quad  0x0000000180000000
+.L4malign:.quad 0xffffffffffc00000
+.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
+.Lnop:	.long  0x07000700
+.Ldiag44:.long 0x83000044
+
+	.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:
+	.quad  0                        # IPL_DEVICE
+        .quad  RAMDISK_ORIGIN           # INITRD_START
+        .quad  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
+#
+	larl  %r15,init_thread_union
+	lg    %r14,__TI_task(%r15)      # cache current in lowcore
+	stg   %r14,__LC_CURRENT
+        aghi  %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
+        stg   %r15,__LC_KERNEL_STACK    # set end of kernel stack
+        aghi  %r15,-160
+        xc    __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
+
+# check control registers
+        stctg  %c0,%c15,0(%r15)
+	oi     6(%r15),0x20             # enable sigp external interrupts
+	oi     4(%r15),0x10             # switch on low address 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
+#
+            .align 8
+.Ldw:       .quad  0x0002000180000000,0x0000000000000000
+.Laregs:    .long  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+