patch-2.2.16 linux/arch/s390/boot/ipldump.S

• Lines: 180
• Date: Wed Jun 7 14:26:42 2000
• Orig file: v2.2.15/linux/arch/s390/boot/ipldump.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN v2.2.15/linux/arch/s390/boot/ipldump.S linux/arch/s390/boot/ipldump.S
@@ -0,0 +1,179 @@
+/*
+ *  arch/s390/boot/ipldump.S
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *
+ *  Tape dump ipl record. Put it on a tape and ipl from it and it will
+ *  write a dump of the real storage after the ipl record on that tape.
+ */
+
+#include <linux/config.h>
+#include <asm/setup.h>
+#include <asm/lowcore.h>
+
+#define IPL_BS 1024
+        .org   0
+        .long  0x00080000,0x80000000+_start    # The first 24 bytes are loaded
+        .long  0x07000000,0x60000001           # by ipl to addresses 0-23.
+        .long  0x02000000,0x20000000+IPL_BS    # (a PSW and two CCWs).
+        .long  0x00000000,0x00000000
+        .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
+        .globl _start
+_start:
+	l     %r1,0xb8                         # load ipl subchannel number
+#
+# find out memory size
+#
+        mvc   104(8,0),.Lpcmem0          # setup program check handler
+        slr   %r3,%r3
+        lhi   %r2,1
+        sll   %r2,20
+.Lloop0:
+        l     %r0,0(%r3)                 # test page
+        ar    %r3,%r2                    # add 1M
+        jnm   .Lloop0                    # r1 < 0x80000000 -> loop
+.Lchkmem0:
+        n     %r3,.L4malign0             # align to multiples of 4M
+        st    %r3,.Lmemsize              # store memory size
+.Lmemok:
+
+#
+# first write a tape mark
+#
+        bras  %r14,.Ltapemark
+#
+# write real storage to tape
+#	
+ 	slr   %r2,%r2                          # start at address 0
+        bras  %r14,.Lwriter                    # load ramdisk
+#
+# write another tape mark
+#
+        bras  %r14,.Ltapemark
+#
+# everything written, stop processor
+#
+        lpsw  .Lstopped
+#
+# subroutine for writing to tape
+# Paramters:	
+#  R1 = device number
+#  R2 = start address
+#  R3 = length
+.Lwriter:	
+        st    %r14,.Lldret
+        la    %r12,.Lorbread                   # r12 = address of orb 
+	la    %r5,.Lirb                        # r5 = address of irb
+        st    %r2,.Lccwwrite+4                 # initialize CCW data addresses
+        lctl  %c6,%c6,.Lcr6               
+        slr   %r2,%r2
+.Lldlp:
+        lhi   %r6,3                            # 3 retries
+.Lssch:
+        ssch  0(%r12)                          # write chunk of IPL_BS bytes
+        jnz   .Llderr
+.Lw4end:
+        bras  %r14,.Lwait4io
+        tm    8(%r5),0x82                      # do we have a problem ?
+        jnz   .Lrecov
+        l     %r0,.Lccwwrite+4                 # update CCW data addresses
+        ahi   %r0,IPL_BS
+        st    %r0,.Lccwwrite+4
+        clr   %r0,%r3                          # enough ?
+        jl    .Lldlp
+.Ldone:
+        l     %r14,.Lldret
+        br    %r14                             # r2 contains the total size
+.Lrecov:
+        bras  %r14,.Lsense                     # do the sensing
+        brct  %r6,.Lssch                       # dec. retry count & branch
+        j     .Llderr
+.Ltapemark:
+        st    %r14,.Lldret
+        la    %r12,.Lorbmark                   # r12 = address of orb
+        la    %r5,.Lirb                        # r5 = address of irb
+        lctl  %c6,%c6,.Lcr6
+        ssch  0(%r12)                          # write a tape mark
+        jnz   .Llderr
+        bras  %r14,.Lwait4io
+        l     %r14,.Lldret
+        br    %r14
+#
+# Sense subroutine
+#
+.Lsense:
+        st    %r14,.Lsnsret
+        la    %r7,.Lorbsense              
+        ssch  0(%r7)                           # start sense command
+        jnz   .Llderr
+        bras  %r14,.Lwait4io
+        l     %r14,.Lsnsret
+        tm    8(%r5),0x82                      # do we have a problem ?
+        jnz   .Llderr
+        br    %r14
+#
+# Wait for interrupt subroutine
+#
+.Lwait4io:
+        lpsw  .Lwaitpsw                 
+.Lioint:
+        c     %r1,0xb8                         # compare subchannel number
+        jne   .Lwait4io
+        tsch  0(%r5)
+        slr   %r0,%r0
+        tm    8(%r5),0x82                      # do we have a problem ?
+        jnz   .Lwtexit
+        tm    8(%r5),0x04                      # got device end ?
+        jz    .Lwait4io
+.Lwtexit:
+        br    %r14
+.Llderr:
+        lpsw  .Lcrash              
+
+        .align 8
+.Lorbread:
+	.long  0x00000000,0x0080ff00,.Lccwwrite
+        .align 8
+.Lorbsense:
+        .long  0x00000000,0x0080ff00,.Lccwsense
+        .align 8
+.Lorbmark:
+        .long  0x00000000,0x0080ff00,.Lccwmark
+        .align 8
+.Lccwwrite:
+        .long  0x01200000+IPL_BS,0x00000000
+.Lccwsense:
+        .long  0x04200001,0x00000000
+.Lccwmark:
+        .long  0x1f200001,0x00000000
+.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
+.Lstopped: .long 0x000a0000,0x00001234
+.Lpcmem0:.long  0x00080000,0x80000000 + .Lchkmem0
+.L4malign0:.long 0xffc00000
+.Lmemsize:.long 0
+.Lldret:.long  0
+.Lsnsret: .long 0
+
+         .org IPL_BS
+