Updated my DeskPro 386 notes
This commit is contained in:
Jeff Parsons
jeffpar
parent
cbeeacd6fd
commit
7be4403eaa
1 changed files with 17 additions and 270 deletions
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@ -86,153 +86,9 @@ Here's the code leading up to it:
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F000:F4A4 0F2200 MOV CR0,EAX ;history=2
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F000:F4A7 EAACF42800 JMP 0028:F4AC ;history=1
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Set the following breakpoints:
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breakpoint enabled: F000:F498 (exec)
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breakpoint enabled: %00FF0758 (write)
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The write breakpoint first catches the code at 0030:F692 copying ROM data near F000:F378
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to memory at %0x00FF0000 near 0x738.
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It later catches code at 0030:C924 writing to that region.
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Then code at 0030:8590:
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EAX=00000048 EBX=000010F0 ECX=00003E29 EDX=00000000
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ESP=000000E4 EBP=00000000 ESI=0000075C EDI=0000075C
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SS=0028[00000300,FFFF] DS=0050[000F0000,FFFF] ES=0048[00FF0000,FFFF]
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CS=0030[000F0000,FFFF] FS=0000[00000000,FFFF] GS=0304[00003040,FFFF]
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LD=0000[00000000,0000] GD=[0001C000,005F] ID=[000FF821,0007] TR=0000 A20=ON
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CR0=0000FFF1 CR2=00000000 CR3=00000000 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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0030:8590 66F3 REPZ
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dw ds:73c l10
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0050:073C 92C0 8000 FFFF 0000 - 9200 0000 FFFF 0000 ................
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0050:074C 9A0F 0000 FFFF 0000 - 9200 C000 FFFF 0000 ................
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dw es:73c l10
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0048:073C 92C0 8000 FFFF 0000 - 9200 0000 FFFF 0000 ................
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0048:074C 9A0F 0000 FFFF 0000 - 9200 C000 FFFF 0000 ................
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dw %ff073c l10
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%00FF073C 92C0 8000 FFFF 0000 - 9200 0000 FFFF 0000 ................
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%00FF074C 9A0F 0000 FFFF 0000 - 9200 C000 FFFF 0000 ................
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Next we stopped here, and the memory at %ff07ec was still good:
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stopped (27129603 ops, 555386 cycles, 117 ms, 4746889 hz)
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EAX=000098FC EBX=0000E000 ECX=00000000 EDX=00000000
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ESP=000000E4 EBP=00000000 ESI=0000FFFF EDI=00007FBE
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SS=0028[00000300,FFFF] DS=0050[80C00000,FFFF] ES=0048[00FF0000,FFFF]
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CS=0030[000F0000,FFFF] FS=0000[00000000,FFFF] GS=0304[00003040,FFFF]
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LD=0000[00000000,0000] GD=[0001C000,005F] ID=[000FF821,0007] TR=0000 A20=ON
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CR0=0000FFF1 CR2=00000000 CR3=00000000 PS=00000083 V0 D0 I0 T0 S1 Z0 A0 P0 C1
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0030:863C 1F POP DS
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%00FF073C 92C0 8000 FFFF 0000 - 9200 0000 FFFF 0000 ................
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%00FF074C 9A0F 0000 FFFF 0000 - 9200 C000 FFFF 0000 ................
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BEFORE AFTER
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====== =====
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id physaddr blkaddr used size type id physaddr blkaddr used size type
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-------- --------- -------- ------ ------ ---- -------- --------- -------- ------ ------ ----
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00020003 %00000000: 00000000 0x8000 0x8000 RAM 00020003 %00000000: 00000000 0x8000 0x8000 RAM
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00020004 %00008000: 00008000 0x8000 0x8000 RAM 00020004 %00008000: 00008000 0x8000 0x8000 RAM
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00020005 %00010000: 00010000 0x8000 0x8000 RAM 00020005 %00010000: 00010000 0x8000 0x8000 RAM
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00020006 %00018000: 00018000 0x8000 0x8000 RAM 00020006 %00018000: 00018000 0x8000 0x8000 RAM
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00020007 %00020000: 00020000 0x8000 0x8000 RAM 00020007 %00020000: 00020000 0x8000 0x8000 RAM
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00020008 %00028000: 00028000 0x8000 0x8000 RAM 00020008 %00028000: 00028000 0x8000 0x8000 RAM
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00020009 %00030000: 00030000 0x8000 0x8000 RAM 00020009 %00030000: 00030000 0x8000 0x8000 RAM
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0002000A %00038000: 00038000 0x8000 0x8000 RAM 0002000A %00038000: 00038000 0x8000 0x8000 RAM
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0002000B %00040000: 00040000 0x8000 0x8000 RAM 0002000B %00040000: 00040000 0x8000 0x8000 RAM
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0002000C %00048000: 00048000 0x8000 0x8000 RAM 0002000C %00048000: 00048000 0x8000 0x8000 RAM
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0002000D %00050000: 00050000 0x8000 0x8000 RAM 0002000D %00050000: 00050000 0x8000 0x8000 RAM
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0002000E %00058000: 00058000 0x8000 0x8000 RAM 0002000E %00058000: 00058000 0x8000 0x8000 RAM
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0002000F %00060000: 00060000 0x8000 0x8000 RAM 0002000F %00060000: 00060000 0x8000 0x8000 RAM
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00020010 %00068000: 00068000 0x8000 0x8000 RAM 00020010 %00068000: 00068000 0x8000 0x8000 RAM
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00020011 %00070000: 00070000 0x8000 0x8000 RAM 00020011 %00070000: 00070000 0x8000 0x8000 RAM
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00020012 %00078000: 00078000 0x8000 0x8000 RAM 00020012 %00078000: 00078000 0x8000 0x8000 RAM
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00020013 %00080000: 00080000 0x8000 0x8000 RAM 00020013 %00080000: 00080000 0x8000 0x8000 RAM
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00020014 %00088000: 00088000 0x8000 0x8000 RAM 00020014 %00088000: 00088000 0x8000 0x8000 RAM
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00020015 %00090000: 00090000 0x8000 0x8000 RAM 00020015 %00090000: 00090000 0x8000 0x8000 RAM
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00020016 %00098000: 00098000 0x8000 0x8000 RAM 00020016 %00098000: 00098000 0x8000 0x8000 RAM
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00020044 %000B8000: 000B8000 0x8000 0x8000 VIDEO 00020050 %000B8000: 000B8000 0x8000 0x8000 VIDEO
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00020001 %000C0000: 000C0000 0x4000 0x8000 ROM 00020001 %000C0000: 000C0000 0x4000 0x8000 ROM
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00020051 %000E0000: 000E0000 0x???? 0x8000 ROM
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00020052 %000E8000: 000E0000 0x???? 0x8000 ROM
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00020002 %000F0000: 000F8000 0x8000 0x8000 ROM 00020053 %000F0000: 000E0000 0x???? 0x8000 ROM
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00020002 %000F8000: 000F8000 0x8000 0x8000 ROM 00020054 %000F8000: 000E0000 0x???? 0x8000 ROM
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00020024 %00100000: 00100000 0x8000 0x8000 RAM 00020024 %00100000: 00100000 0x8000 0x8000 RAM
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00020025 %00108000: 00108000 0x8000 0x8000 RAM 00020025 %00108000: 00108000 0x8000 0x8000 RAM
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00020026 %00110000: 00110000 0x8000 0x8000 RAM 00020026 %00110000: 00110000 0x8000 0x8000 RAM
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00020027 %00118000: 00118000 0x8000 0x8000 RAM 00020027 %00118000: 00118000 0x8000 0x8000 RAM
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00020028 %00120000: 00120000 0x8000 0x8000 RAM 00020028 %00120000: 00120000 0x8000 0x8000 RAM
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00020029 %00128000: 00128000 0x8000 0x8000 RAM 00020029 %00128000: 00128000 0x8000 0x8000 RAM
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0002002A %00130000: 00130000 0x8000 0x8000 RAM 0002002A %00130000: 00130000 0x8000 0x8000 RAM
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0002002B %00138000: 00138000 0x8000 0x8000 RAM 0002002B %00138000: 00138000 0x8000 0x8000 RAM
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0002002C %00140000: 00140000 0x8000 0x8000 RAM 0002002C %00140000: 00140000 0x8000 0x8000 RAM
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0002002D %00148000: 00148000 0x8000 0x8000 RAM 0002002D %00148000: 00148000 0x8000 0x8000 RAM
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0002002E %00150000: 00150000 0x8000 0x8000 RAM 0002002E %00150000: 00150000 0x8000 0x8000 RAM
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0002002F %00158000: 00158000 0x8000 0x8000 RAM 0002002F %00158000: 00158000 0x8000 0x8000 RAM
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00020030 %00160000: 00160000 0x8000 0x8000 RAM 00020030 %00160000: 00160000 0x8000 0x8000 RAM
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00020031 %00168000: 00168000 0x8000 0x8000 RAM 00020031 %00168000: 00168000 0x8000 0x8000 RAM
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00020032 %00170000: 00170000 0x8000 0x8000 RAM 00020032 %00170000: 00170000 0x8000 0x8000 RAM
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00020033 %00178000: 00178000 0x8000 0x8000 RAM 00020033 %00178000: 00178000 0x8000 0x8000 RAM
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00020034 %00180000: 00180000 0x8000 0x8000 RAM 00020034 %00180000: 00180000 0x8000 0x8000 RAM
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00020035 %00188000: 00188000 0x8000 0x8000 RAM 00020035 %00188000: 00188000 0x8000 0x8000 RAM
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00020036 %00190000: 00190000 0x8000 0x8000 RAM 00020036 %00190000: 00190000 0x8000 0x8000 RAM
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00020037 %00198000: 00198000 0x8000 0x8000 RAM 00020037 %00198000: 00198000 0x8000 0x8000 RAM
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00020038 %001A0000: 001A0000 0x8000 0x8000 RAM 00020038 %001A0000: 001A0000 0x8000 0x8000 RAM
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00020039 %001A8000: 001A8000 0x8000 0x8000 RAM 00020039 %001A8000: 001A8000 0x8000 0x8000 RAM
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0002003A %001B0000: 001B0000 0x8000 0x8000 RAM 0002003A %001B0000: 001B0000 0x8000 0x8000 RAM
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0002003B %001B8000: 001B8000 0x8000 0x8000 RAM 0002003B %001B8000: 001B8000 0x8000 0x8000 RAM
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0002003C %001C0000: 001C0000 0x8000 0x8000 RAM 0002003C %001C0000: 001C0000 0x8000 0x8000 RAM
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0002003D %001C8000: 001C8000 0x8000 0x8000 RAM 0002003D %001C8000: 001C8000 0x8000 0x8000 RAM
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0002003E %001D0000: 001D0000 0x8000 0x8000 RAM 0002003E %001D0000: 001D0000 0x8000 0x8000 RAM
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0002003F %001D8000: 001D8000 0x8000 0x8000 RAM 0002003F %001D8000: 001D8000 0x8000 0x8000 RAM
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00020040 %001E0000: 001E0000 0x8000 0x8000 RAM 00020040 %001E0000: 001E0000 0x8000 0x8000 RAM
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00020041 %001E8000: 001E8000 0x8000 0x8000 RAM 00020041 %001E8000: 001E8000 0x8000 0x8000 RAM
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00020042 %001F0000: 001F0000 0x8000 0x8000 RAM 00020042 %001F0000: 001F0000 0x8000 0x8000 RAM
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00020043 %001F8000: 001F8000 0x8000 0x8000 RAM 00020043 %001F8000: 001F8000 0x8000 0x8000 RAM
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00020017 %00FA0000: 00FA0000 0x8000 0x8000 RAM 00020017 %00FA0000: 00FA0000 0x8000 0x8000 RAM
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00020018 %00FA8000: 00FA8000 0x8000 0x8000 RAM 00020018 %00FA8000: 00FA8000 0x8000 0x8000 RAM
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00020019 %00FB0000: 00FB0000 0x8000 0x8000 RAM 00020019 %00FB0000: 00FB0000 0x8000 0x8000 RAM
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0002001A %00FB8000: 00FB8000 0x8000 0x8000 RAM 0002001A %00FB8000: 00FB8000 0x8000 0x8000 RAM
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0002001B %00FC0000: 00FC0000 0x8000 0x8000 RAM 0002001B %00FC0000: 00FC0000 0x8000 0x8000 RAM
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0002001C %00FC8000: 00FC8000 0x8000 0x8000 RAM 0002001C %00FC8000: 00FC8000 0x8000 0x8000 RAM
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0002001D %00FD0000: 00FD0000 0x8000 0x8000 RAM 0002001D %00FD0000: 00FD0000 0x8000 0x8000 RAM
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0002001E %00FD8000: 00FD8000 0x8000 0x8000 RAM 0002001E %00FD8000: 00FD8000 0x8000 0x8000 RAM
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0002001F %00FE0000: 00FE0000 0x8000 0x8000 RAM 0002001F %00FE0000: 00FE0000 0x8000 0x8000 RAM
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00020020 %00FE8000: 00FE8000 0x8000 0x8000 RAM 00020020 %00FE8000: 00FE8000 0x8000 0x8000 RAM
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00020021 %00FF0000: 00FF0000 0x8000 0x8000 RAM 00020021 %00FF0000: 00FF0000 0x8000 0x8000 RAM
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00020022 %00FF8000: 00FF8000 0x8000 0x8000 RAM 00020022 %00FF8000: 00FF8000 0x8000 0x8000 RAM
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00020023 %80C00000: 80C00000 0x0001 0x8000 H/W 00020023 %80C00000: 80C00000 0x0001 0x8000 H/W
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00020002 %FFFF0000: 000F8000 0x8000 0x8000 ROM 00020002 %FFFF0000: 000F8000 0x8000 0x8000 ROM
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00020002 %FFFF8000: 000F8000 0x8000 0x8000 ROM 00020002 %FFFF8000: 000F8000 0x8000 0x8000 ROM
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But when we stopped here next, it was no longer good:
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breakpoint hit: F000:F498 (exec)
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stopped (27572162 ops, 443166 cycles, 143 ms, 3099063 hz)
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EAX=0000FF00 EBX=00000080 ECX=0000270F EDX=0000004A
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ESP=000000FE EBP=00000000 ESI=00007FB6 EDI=00008000
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SS=0030 DS=0040 ES=0000 FS=0000 GS=0304 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F498 2E CS:
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F000:F499 0F01167E07 LGDT [077E]
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F000:077E 0047 0730 00FF FFFF - 0000 0000 87AA 0018 G.0.............
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F000:078E 87F8 0018 8828 0018 - 0F2E 1601 0778 200F ....(.......x..
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%00FF0730 0000 0000 0000 0000 - 0000 0000 0000 0000 ................
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%00FF0740 0000 0000 0000 0000 - 0000 0000 0000 0000 ................
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Here's a fresher run:
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id physaddr blkaddr used size type id physaddr blkaddr used size type
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-------- --------- -------- ------ ------ ---- -------- --------- -------- ------ ------ ----
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00040006 %00000000: 00000000 0x8000 0x8000 RAM 00040006 %00000000: 00000000 0x8000 0x8000 RAM
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@ -308,130 +164,21 @@ Here's a fresher run:
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00040046 %80C00000: 80C00000 0x0001 0x8000 H/W 00040046 %80C00000: 80C00000 0x0001 0x8000 H/W
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00040004 %FFFF0000: 000F8000 0x8000 0x8000 ROM 00040004 %FFFF0000: 000F8000 0x8000 0x8000 ROM
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00040004 %FFFF8000: 000F8000 0x8000 0x8000 ROM 00040004 %FFFF8000: 000F8000 0x8000 0x8000 ROM
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running
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notice: PIC0(0x20): unsupported OCW2 automatic EOI command: 0x00
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stopped (149 ops, 622 cycles, 20 ms, 31100 hz)
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EAX=0000F000 EBX=00000000 ECX=00000008 EDX=00000020
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ESP=00000000 EBP=00000000 ESI=0000F8E7 EDI=00000000
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SS=0000 DS=F000 ES=0000 FS=0000 GS=0304 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F9ED E6A0 OUT A0,AL
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running
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notice: PIC1(0xA0): unsupported OCW2 automatic EOI command: 0x00
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stopped (150 ops, 5 cycles, 17 ms, 294 hz)
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EAX=0000F000 EBX=00000000 ECX=00000008 EDX=00000020
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ESP=00000000 EBP=00000000 ESI=0000F8E7 EDI=00000000
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SS=0000 DS=F000 ES=0000 FS=0000 GS=0304 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F9EF B009 MOV AL,09
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running
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notice: PIC0(0x20): unsupported OCW2 automatic EOI command: 0x00
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stopped (19729382 ops, 89821236 cycles, 6351 ms, 14142849 hz)
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EAX=0000F000 EBX=00000006 ECX=00000008 EDX=00000020
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ESP=00000000 EBP=00000000 ESI=0000F8E7 EDI=00000000
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SS=0000 DS=F000 ES=0000 FS=0000 GS=0000 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F9ED E6A0 OUT A0,AL
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running
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notice: PIC1(0xA0): unsupported OCW2 automatic EOI command: 0x00
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stopped (19729383 ops, 5 cycles, 15 ms, 333 hz)
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EAX=0000F000 EBX=00000006 ECX=00000008 EDX=00000020
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ESP=00000000 EBP=00000000 ESI=0000F8E7 EDI=00000000
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SS=0000 DS=F000 ES=0000 FS=0000 GS=0000 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F9EF B009 MOV AL,09
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running
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notice: PIC0(0x20): unsupported OCW2 automatic EOI command: 0x00
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stopped (25359063 ops, 12731563 cycles, 1260 ms, 10104415 hz)
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EAX=0000F000 EBX=00000003 ECX=00000008 EDX=00000020
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ESP=00000000 EBP=00000000 ESI=0000F8E7 EDI=00000000
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SS=0000 DS=F000 ES=0000 FS=0000 GS=0000 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F9ED E6A0 OUT A0,AL
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running
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notice: PIC1(0xA0): unsupported OCW2 automatic EOI command: 0x00
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stopped (25359064 ops, 5 cycles, 17 ms, 294 hz)
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EAX=0000F000 EBX=00000003 ECX=00000008 EDX=00000020
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ESP=00000000 EBP=00000000 ESI=0000F8E7 EDI=00000000
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SS=0000 DS=F000 ES=0000 FS=0000 GS=0000 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F9EF B009 MOV AL,09
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running
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stopped (27129586 ops, 2209813 cycles, 382 ms, 5784851 hz)
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EAX=000098FC EBX=0000E000 ECX=00000000 EDX=00000000
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ESP=000000E4 EBP=00000000 ESI=0000FFFF EDI=00007FBE
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SS=0028[00000300,FFFF] DS=0050[80C00000,FFFF] ES=0048[00FF0000,FFFF]
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CS=0030[000F0000,FFFF] FS=0000[00000000,FFFF] GS=0304[00003040,FFFF]
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LD=0000[00000000,0000] GD=[0001C000,005F] ID=[000FF821,0007] TR=0000 A20=ON
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CR0=0000FFF1 CR2=00000000 CR3=00000000 PS=00000083 V0 D0 I0 T0 S1 Z0 A0 P0 C1
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0030:863C 1F POP DS
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But when we stopped here next, it was no longer good:
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breakpoint hit: F000:F498 (exec)
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stopped (27572162 ops, 443166 cycles, 143 ms, 3099063 hz)
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EAX=0000FF00 EBX=00000080 ECX=0000270F EDX=0000004A
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ESP=000000FE EBP=00000000 ESI=00007FB6 EDI=00008000
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SS=0030 DS=0040 ES=0000 FS=0000 GS=0304 PS=00000046 V0 D0 I0 T0 S0 Z1 A0 P1 C0
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F000:F498 2E CS:
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F000:F499 0F01167E07 LGDT [077E]
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F000:077E 0047 0730 00FF FFFF - 0000 0000 87AA 0018 G.0.............
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F000:078E 87F8 0018 8828 0018 - 0F2E 1601 0778 200F ....(.......x..
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%00FF0730 0000 0000 0000 0000 - 0000 0000 0000 0000 ................
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%00FF0740 0000 0000 0000 0000 - 0000 0000 0000 0000 ................
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Turns out this is because the A20 line has been disabled.
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