Description
Reported by 'finger'. With some added debug prints:
(ntoskrnl/kd/kdio.c:384) -----------------------------------------------------
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(ntoskrnl/kd/kdio.c:385) ReactOS 0.5-SVN (Build 20170522-r74622)
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(ntoskrnl/kd/kdio.c:387) 1 System Processor [2859 MB Memory]
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(ntoskrnl/kd/kdio.c:388) Command Line: DEBUG DEBUGPORT=COM1 BAUDRATE=115200 SOS MININT
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(ntoskrnl/kd/kdio.c:392) ARC Paths: multi(0)disk(0)cdrom(32) \ multi(0)disk(0)cdrom(32) \reactos\
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(ntoskrnl/ke/i386/cpu.c:450) Supported CPU features : KF_V86_VIS KF_RDTSC KF_CR4 KF_CMOV KF_GLOBAL_PAGE KF_LARGE_PAGE KF_MTRR KF_CMPXCHG8B KF_MMX KF_WORKING_PTE KF_PAT KF_FXSR KF_FAST_SYSCALL KF_XMMI KF_XMMI64 KF_DTS KF_NX_BIT
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(ntoskrnl/ke/i386/cpu.c:722) Prefetch Cache: 64 bytes L2 Cache: 3145728 bytes L2 Cache Line: 64 bytes L2 Cache Associativity: 12
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(ntoskrnl/mm/ARM3/mminit.c:1442) HAL I/O Mapping at FFFE0000 is unsafe
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(../hal/halx86/generic/bios.c:75) HAL: An invalid V86 opcode was encountered at address C000:3E68 (EFL 233202)
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Opcode: 66 EF 2E 8B 16 5E AA 66 ED 80
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(../hal/halx86/generic/bios.c:79) EFLAGS: 0x233202, EAX: 71410, EDX: 22ff00
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(../hal/halx86/generic/bios.c:89) TR: 0x28, PCR TSS: 80735000, TssBase: 80735000, TssLimit: 0x20ab
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(../hal/halx86/generic/bios.c:91) IoMapBase: 88
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(../hal/halx86/generic/bios.c:93) IoMap[0]: 0
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(../hal/halx86/generic/bios.c:94) IoMap[1fe0]: ff
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Entered debugger on embedded INT3 at 0x0008:0x80943fbe.
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Disassembly of the offending instructions:
0: 66 ef out dx,eax
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2: 2e 8b 16 5e aa mov dx,WORD PTR cs:0xaa5e
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7: 66 ed in eax,dx
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The video bios is trying to write 0x00071410 to I/O port 0xff00.
Turns out item 1fe0 in the IoMap is indeed always 'ff', despite HalpStoreAndClearIopm intending to clear it. This is because HalpSavedIoMap does not actually point to the I/O map array but to its parent structure.
Attachments
Issue Links
- relates to
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CORE-1688 Virtual PC 2004 bug check
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- Closed
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