Re: PCI MMIO under DOSEMU

[jean-francois simon <jfs@themis.com>]

Bart Oldeman wrote:
> 2009/6/24 jean-francois simon <jfs@themis.com>:
>> i have a dos program using DPMI and making PCI accesses. it runs fine as
>> a DOS stand alone. Under dosemu  it can make PCI configuration access no
>> problem. but when it tries to make PCI memory access then it fails. i am
>> trying to access the following PCI MMIO resource at address 0xDFFFF000:
>>
>> 0a:0a.0 Bridge: Device 1895:0001 (rev 01)
>>        Subsystem: Device 1895:0001
>>        Flags: bus master, medium devsel, latency 64, IRQ 10
>>        Memory at dffff000 (32-bit, non-prefetchable) [size=4K]
>>        Memory at 80000000 (32-bit, non-prefetchable) [size=1024M]
>>        Memory at de000000 (32-bit, non-prefetchable) [size=16M]
>>        Memory at dd000000 (32-bit, non-prefetchable) [size=16M]
>>        Memory at 7e000000 (64-bit, prefetchable) [size=16M]
>>
>>
>> is it possible to access PCI MMIO under dosemu?
> 
> This should be possible using $_hardware_ram:
> $_hardware_ram = "range 0xdffff000,0xdfffffff range 0x80000000,0x80100000"  etc.
> 
> Bart
> 


thx for the info.
i have tried it and it fails with:

Page fault: write instruction to linear address: 0xdffff3fc
CPU was in user mode
Exception was caused by non-available page
  VFLAGS(b): 010000001010000110
EAX: 01000000  EBX: 00cc8600  ECX: 00cc8600  EDX: 00000615  VFLAGS(h):
00010286
ESI: 00000212  EDI: dffff3fc  EBP: 00000000
CS: 0033  DS: 0000  ES: 0000  FS: 0000  GS: 0000

the address is valid since it is that which is reported by lspci. but it
seems like a permission issue (CPU was in user mode). i did a "dosemu
-s" though.
-jfs