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[HAL]: Implement system bus address translation.

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svn path=/trunk/; revision=47677
This commit is contained in:
Sir Richard 2010-06-07 20:59:00 +00:00
parent 7ebba8b83c
commit fc0a9b1bef
1 changed files with 83 additions and 2 deletions
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85
reactos/hal/halx86/generic/legacy/bus/sysbus.c
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@ -24,8 +24,89 @@ HalpTranslateSystemBusAddress(IN PBUS_HANDLER BusHandler,
IN OUT PULONG AddressSpace,
OUT PPHYSICAL_ADDRESS TranslatedAddress)
{
DPRINT1("SYSTEM Translate\n");
while (TRUE);
PSUPPORTED_RANGE Range = NULL;
/* Check what kind of address space this is */
switch (*AddressSpace)
{
/* Memory address */
case 0:
/* Loop all prefetech memory */
for (Range = &BusHandler->BusAddresses->PrefetchMemory;
Range;
Range = Range->Next)
{
/* Check if it's in a valid range */
if ((BusAddress.QuadPart >= Range->Base) &&
(BusAddress.QuadPart <= Range->Limit))
{
/* Get out */
break;
}
}
/* Check if we haven't found anything yet */
if (!Range)
{
/* Loop all bus memory */
for (Range = &BusHandler->BusAddresses->Memory;
Range;
Range = Range->Next)
{
/* Check if it's in a valid range */
if ((BusAddress.QuadPart >= Range->Base) &&
(BusAddress.QuadPart <= Range->Limit))
{
/* Get out */
break;
}
}
}
/* Done */
break;
/* I/O Space */
case 1:
/* Loop all bus I/O memory */
for (Range = &BusHandler->BusAddresses->IO;
Range;
Range = Range->Next)
{
/* Check if it's in a valid range */
if ((BusAddress.QuadPart >= Range->Base) &&
(BusAddress.QuadPart <= Range->Limit))
{
/* Get out */
break;
}
}
/* Done */
break;
}
/* Check if we found a range */
if (Range)
{
/* Do the translation and return the kind of address space this is */
TranslatedAddress->QuadPart = BusAddress.QuadPart + Range->SystemBase;
if ((TranslatedAddress->QuadPart != BusAddress.QuadPart) ||
(*AddressSpace != Range->SystemAddressSpace))
{
/* Different than what the old HAL would do */
DPRINT1("Translation of %I64x is %I64x %s\n",
BusAddress.QuadPart, TranslatedAddress->QuadPart,
Range->SystemAddressSpace ? "In I/O Space" : "In RAM");
}
*AddressSpace = Range->SystemAddressSpace;
return TRUE;
}
/* Nothing found */
DPRINT1("Translation of %I64x failed!\n", BusAddress.QuadPart);
return FALSE;
}