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[BOOTVID]: Fix completely broken VidInitialize routine. I have no idea what the original code was trying to accomplish.

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svn path=/trunk/; revision=45269
This commit is contained in:
Sir Richard 2010-01-26 19:21:41 +00:00
parent 71162a52f5
commit 590b4a4093
1 changed files with 63 additions and 62 deletions
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125
reactos/drivers/base/bootvid/i386/bootvid.c
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@ -357,7 +357,7 @@ VidInitialize(IN BOOLEAN SetMode)
{
ULONG Context = 0;
PHYSICAL_ADDRESS TranslatedAddress;
PHYSICAL_ADDRESS NullAddress = {{0, 0}};
PHYSICAL_ADDRESS NullAddress = {{0, 0}}, VgaAddress;
ULONG AddressSpace = 1;
BOOLEAN Result;
ULONG_PTR Base;
@ -373,12 +373,57 @@ VidInitialize(IN BOOLEAN SetMode)
TRUE);
if (!Result) return FALSE;
/* See if this is I/O Space, which we need to map */
TryAgain:
/* Loop trying to find posssible VGA base addresses */
while (TRUE)
{
/* See if this is I/O Space, which we need to map */
if (!AddressSpace)
{
/* Map it */
Base = (ULONG_PTR)MmMapIoSpace(TranslatedAddress, 0x400, MmNonCached);
}
else
{
/* The base is the translated address, no need to map I/O space */
Base = TranslatedAddress.LowPart;
}
/* Try to see if this is VGA */
VgaRegisterBase = Base;
if (VgaIsPresent())
{
/* Translate the VGA Memory Address */
VgaAddress.LowPart = 0xA0000;
AddressSpace = 0;
Result = HalFindBusAddressTranslation(VgaAddress,
&AddressSpace,
&TranslatedAddress,
&Context,
FALSE);
if (Result) break;
/* Try to see if there's any other address */
Result = HalFindBusAddressTranslation(NullAddress,
&AddressSpace,
&TranslatedAddress,
&Context,
TRUE);
if (!Result) return FALSE;
}
else
{
/* It's not, so unmap the I/O space if we mapped it */
if (!AddressSpace) MmUnmapIoSpace((PVOID)VgaRegisterBase, 0x400);
}
}
/* Success! See if this is I/O Space, which we need to map */
if (!AddressSpace)
{
/* Map it */
Base = (ULONG_PTR)MmMapIoSpace(TranslatedAddress, 0x400, MmNonCached);
Base = (ULONG_PTR)MmMapIoSpace(TranslatedAddress,
0x20000,
MmNonCached);
}
else
{
@ -386,67 +431,23 @@ TryAgain:
Base = TranslatedAddress.LowPart;
}
/* Set the VGA Register base and now check if we have a VGA device */
VgaRegisterBase = Base;
if (VgaIsPresent())
/* Set the VGA Memory Base */
VgaBase = Base;
/* Now check if we have to set the mode */
if (SetMode)
{
/* Translate the VGA Memory Address */
NullAddress.LowPart = 0xA0000;
AddressSpace = 0;
Result = HalFindBusAddressTranslation(NullAddress,
&AddressSpace,
&TranslatedAddress,
&Context,
FALSE);
if (Result)
{
/* Success! See if this is I/O Space, which we need to map */
if (!AddressSpace)
{
/* Map it */
Base = (ULONG_PTR)MmMapIoSpace(TranslatedAddress,
0x20000,
MmNonCached);
}
else
{
/* The base is the translated address, no need to map I/O space */
Base = TranslatedAddress.LowPart;
}
/* Reset the display */
HalResetDisplay();
curr_x = 0;
curr_y = 0;
/* Set the VGA Memory Base */
VgaBase = Base;
/* Now check if we have to set the mode */
if (SetMode)
{
/* Reset the display */
HalResetDisplay();
curr_x = 0;
curr_y = 0;
/* Initialize it */
VgaInterpretCmdStream(AT_Initialization);
return TRUE;
}
}
/* Initialize it */
VgaInterpretCmdStream(AT_Initialization);
}
else
{
/* It's not, so unmap the I/O space if we mapped it */
if (!AddressSpace) MmUnmapIoSpace((PVOID)VgaRegisterBase, 0x400);
}
/* If we got here, then we failed...let's try again */
Result = HalFindBusAddressTranslation(NullAddress,
&AddressSpace,
&TranslatedAddress,
&Context,
TRUE);
if (Result) goto TryAgain;
/* If we got here, then we failed even past our re-try... */
return FALSE;
/* VGA is ready */
return TRUE;
}
/*