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[FREELDR][XBOXVMP] Check only low 28 bits for framebuffer address (#2249)

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Fixes framebuffer detection on real hardware Xbox.
This commit is contained in:
Stanislav Motylkov 2020-01-14 22:20:22 +03:00 • committed by Hermès BÉLUSCA - MAÏTO
parent 8f72618453
commit afdb42023c
2 changed files with 9 additions and 1 deletions
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5
win32ss/drivers/miniport/xboxvmp/xboxvmp.c
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@ -394,6 +394,10 @@ XboxVmpMapVideoMemory(
/* Reuse framebuffer that was set up by firmware */
FrameBuffer.QuadPart = *((PULONG)((ULONG_PTR)DeviceExtension->VirtControlStart + NV2A_CONTROL_FRAMEBUFFER_ADDRESS_OFFSET));
/* Framebuffer address offset value is coming from the GPU within
* memory mapped I/O address space, so we're comparing only low
* 28 bits of the address within actual RAM address space */
FrameBuffer.QuadPart &= 0x0FFFFFFF;
if (FrameBuffer.QuadPart != 0x3C00000 && FrameBuffer.QuadPart != 0x7C00000)
{
/* Check framebuffer address (high 4 MB of either 64 or 128 MB RAM) */
@ -402,6 +406,7 @@ XboxVmpMapVideoMemory(
/* Verify that framebuffer address is page-aligned */
ASSERT(FrameBuffer.QuadPart % PAGE_SIZE == 0);
/* Return the address back to GPU memory mapped I/O */
FrameBuffer.QuadPart += DeviceExtension->PhysFrameBufferStart.QuadPart;
MapInformation->VideoRamBase = RequestedAddress->RequestedVirtualAddress;
/* FIXME: obtain fb size from firmware somehow (Cromwell reserves high 4 MB of RAM) */