iplfba.S
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上传日期:2013-02-24
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文件大小:5k
- #
- # Ipl block for fba devices
- # Copyright (C) 1998 IBM Corporation
- # Author(s): Martin Schwidefsky
- #
- # startup for ipl at address 0
- # start with restart
- # The first 24 byes are loaded by ipl to addresses 0-23 (a PSW and two CCWs).
- # The CCWs on 8-23 are used as a continuation of the implicit ipl channel
- # program. The fba ipl loader only uses the CCW on 8-15 to load the first 512
- # byte block to location 0-511 (the reading starts again at block 0, byte 0).
- # The second CCW is used to store the location of the load list.
- .org 0
- .long 0x00080000,0x80000000+_start # The first 24 byte are loaded
- .long 0x02000000,0x20000200 # by ipl to addresses 0-23.
- .long 0x00000001,0x00000001 # (PSW, one CCW & loadlist info).
- .globl _start
- _start:
- basr %r13,0
- .LPG0:
- l %r1,0xb8 # load ipl subchannel number
- lhi %r2,0x200 # location for the loadlist
- lm %r3,%r4,0x10 # blocknr and length of loadlist
- bras %r14,.Lloader # load loadlist
- lhi %r11,0x400
- lhi %r12,0x200 # load address of loadlist
- l %r3,0(%r12) # get first block number
- l %r4,4(%r12) # get first block count
- la %r12,8(%r12)
- j .Llistloop
- .org 0x50
- .Llistloop:
- lr %r2,%r11 # load address
- lr %r5,%r4 # block count
- mhi %r5,512
- la %r11,0(%r5,%r11) # update load address
- bras %r14,.Lloader # load chunk of the image
- l %r3,0(%r12) # get next block number
- icm %r4,15,4(%r12) # get next block count
- la %r12,8(%r12)
- jnz .Llistloop
- #
- # everything loaded, go for it
- #
- l %r1,.Lstart-.LPG0(%r13)
- br %r1
- #
- # subroutine for loading a sequence of block from fba
- # %r2: load address (24 bit address)
- # %r3: number of first block (unsigned long)
- # %r4: number of blocks to load (unsigned short)
- #
- .org 0xC0
- .Lloader:
- la %r5,.Llo-.LPG0(%r13)
- sth %r4,2(%r5) # initialize block count
- st %r3,4(%r5) # initialize block number
- la %r5,.Lccws-.LPG0(%r13)
- mhi %r4,512
- sth %r4,22(%r5) # initialize byte count
- icm %r2,8,16(%r5)
- st %r2,16(%r5) # initialize CCW data address
- slr %r2,%r2
- la %r3,.Lorb-.LPG0(%r13) # r2 = address of orb into r2
- la %r4,.Ltinfo-.LPG0(%r13) # r3 = address of tpi info block
- la %r5,.Lirb-.LPG0(%r13) # r4 = address of irb
- lctl %c6,%c6,.Lc6-.LPG0(%r13)
- .Lldlp:
- ssch 0(%r3) # read blocks
- .Ltpi:
- tpi 0(%r4) # test pending interrupt
- jz .Ltpi
- c %r1,0(%r4) # compare subchannel number
- jne .Ltpi
- tsch 0(%r5)
- slr %r0,%r0
- tm 8(%r5),0x82 # do we have a problem ?
- jnz .Ldwpsw
- tm 8(%r5),0x04 # got device end ?
- jz .Ltpi
- .Lexit:
- br %r14
- .align 8
- .Ldwpsw:.long 0x000a0000,0x00000000
- .Lorb: .long 0x00000000,0x0000ff00,.Lccws
- .Ltinfo:.long 0
- .Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- .Lc6: .long 0xff000000
- .Lloadp:.long 0,0
- .Lparm: .long 0x10400
- .Lstart:.long 0x10000
- .align 8
- .Lccws: .long 0x63000000+.Lde,0x60000010 # define extent
- .long 0x43000000+.Llo,0x60000008 # locate
- # offset 1 in read CCW: data address (24 bit)
- # offset 6 in read CCW: number of bytes (16 bit)
- .long 0x42000000,0x20000000 # read
- .Lde: .long 0x40000200,0x00000000
- .long 0x00000000,0x00001000
- # offset 2 in .Llo: block count (unsigned short)
- # offset 4 in .Llo: block number (unsigned long)
- .Llo: .long 0x06000000,0x00000000
- .org 0x200
- .long 0x00000002,0x0000007f
- .long 0x00000081,0x0000007f
- .long 0x00000100,0x0000007f
- .long 0x0000017f,0x0000007f
- .long 0x000001fe,0x0000007f
- .long 0x0000027d,0x0000007f
- .long 0x000002fc,0x0000007f
- .long 0x0000037b,0x0000007f
- .long 0x000003fa,0x0000007f
- .long 0x00000479,0x0000007f
- .long 0x000004f8,0x0000007f
- .long 0x00000577,0x0000007f
- .long 0x000005f6,0x0000007f
- .long 0x00000675,0x0000007f
- .long 0x000006f4,0x0000007f
- .long 0x00000773,0x0000003f
- .long 0x00000000,0x00000000
- .org 0x400