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annotate ipl/ipl.S @ 91:8479bfdeb375

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merge
author Jonathan Pevarnek <pevarnj@gmail.com>
date Thu, 12 May 2011 13:25:58 -0400
parents 5d9f272f4db6
children 180108494f08
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
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1 # During the system IPL, 24 bytes are read from the device.
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2 #
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3 # NOTE: zArch IPLs in ESA/390 mode.
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4 #
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5
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6 #
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7 # Bytes 0-7 contain PSW to be loaded after IO operation completes
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8 #
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9 .byte 0x00
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10 # bits value name desc
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11 # 0 0 <zero>
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12 # 1 0 PER Mask (R) disabled
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13 # 2-4 0 <zero>
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14 # 5 0 DAT Mode (T) disabled
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15 # 6 0 I/O Mask (IO) disabled
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16 # 7 0 External Mask (EX) disabled
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17
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18 .byte 0x08
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19 # bits value name desc
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20 # 8-11 0 Key
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21 # 12 1 <one>
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22 # 13 0 Machine-Check Mask (M) disabled
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23 # 14 0 Wait State (W) executing
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24 # 15 0 Problem State (P) supervisor state
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25
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26 .byte 0x00
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27 # bits value name desc
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28 # 16-17 0 Address-Space Control (AS) disabled
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29 # 18-19 0 Condition Code (CC)
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30 # 20-23 0 Program Mask exceptions disabled
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31
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32 .byte 0x00
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33 # bits value name desc
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34 # 24-30 0 <zero>
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35 # 31 0 Extended Addressing (EA) ! 64 mode
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36
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37 .byte 0x80 # bits 32-39
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38 .byte 0x80 # bits 40-47
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39 .byte 0x00 # bits 48-55
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40 .byte 0x00 # bits 56-63
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41 # bits value name desc
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42 # 32 1 Basic Addressing (BA) BA = 31, !BA = 24
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43 # 33-63 addr Instruction Address Address to exec
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44
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45 #
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46 # The remaining 16 bytes should contain CCW to read data from device
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47 #
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48
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49 # CCW format-0:
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50 # bits name
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51 # 0-7 Cmd Code
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52 # 8-31 Data Address
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53 # 32 Chain-Data (CD)
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54 # 33 Chain-Command (CC)
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55 # 34 Sup.-Len.-Inditcation (SLI)
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56 # 35 Skip (SKP)
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57 # 36 Prog.-Contr.-Inter. (PCI)
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58 # 37 Indir.-Data-Addr. (IDA)
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59 # 38 Suspend (S)
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60 # 39 Modified I.D.A. (MIDA)
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61 # 40-47 <ignored>
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62 # 48-63 number of bytes to read
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63
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64 #
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65 # CCW 1 (bytes 8-15): format-0
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66 #
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67 # read 80 bytes to 0x18
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68 .byte 0x02, 0x00, 0x00, 0x18
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69 .byte 0x60, 0x00, 0x00, 0x50
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70
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71 #
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72 # CCW 2 (bytes 16-23): format-0
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73 #
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74 # read 24 bytes to 0x68
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75 .byte 0x02, 0x00, 0x00, 0x68
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76 .byte 0x60, 0x00, 0x00, 0x18
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77
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78 #
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79 # Pad to fill up a whole card
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80 #
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81 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 24-31
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82 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 32-39
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83 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 40-47
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84 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 48-55
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85 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 56-63
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86 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 64-71
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87 .byte 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 # bytes 72-79
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88