[reactos] 06/11: [VGAMP] Correctly check and report legacy resources (VGA I/O ports and memory)

[Hervé Poussineau]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=951dc66c6695cceebaeda1...

commit 951dc66c6695cceebaeda16b874847d43e263cda
Author:     Hervé Poussineau [e-mail]
AuthorDate: Thu Oct 7 21:40:13 2021 +0200
Commit:     Hervé Poussineau [e-mail]
CommitDate: Thu Oct 14 23:39:30 2021 +0200

[VGAMP] Correctly check and report legacy resources (VGA I/O ports and memory)

As we are a non PNP driver, the call chain will be
    DriverEntry -> VidePortInitialize -> VideoPortFindAdapter -> HwFindAdapter.

If legacy resources are available, we will fail VGAFindAdapter,
    so DriverEntry will fail, so vgamp.sys driver won't be used.

CORE-17789
---
 win32ss/drivers/miniport/vga/vgamp.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/win32ss/drivers/miniport/vga/vgamp.c b/win32ss/drivers/miniport/vga/vgamp.c
index f4cd3a26c41..4b892cc281e 100644
--- a/win32ss/drivers/miniport/vga/vgamp.c
+++ b/win32ss/drivers/miniport/vga/vgamp.c
@@ -10,6 +10,13 @@
 #include <dderror.h>
 #include <devioctl.h>

+VIDEO_ACCESS_RANGE VGAAccessRange[] =
+{
+    { {{0x3b0}}, 0x3bb - 0x3b0 + 1, 1, 0, 0 },
+    { {{0x3c0}}, 0x3df - 0x3c0 + 1, 1, 0, 0 },
+    { {{0xa0000}}, 0x20000, 0, 0, 0 },
+};
+
 //  -------------------------------------------------------  Public Interface

//    DriverEntry
@@ -45,6 +52,8 @@ DriverEntry(IN PVOID Context1,
   /* InitData.HwInterrupt = VGAInterrupt;  */
   InitData.HwResetHw = VGAResetHw;
   /* InitData.HwTimer = VGATimer;  */
+  InitData.HwLegacyResourceList = VGAAccessRange;
+  InitData.HwLegacyResourceCount = ARRAYSIZE(VGAAccessRange);

return  VideoPortInitialize(Context1, Context2, &InitData, NULL);
 }
@@ -82,12 +91,21 @@ VGAFindAdapter(PVOID DeviceExtension,
                PVIDEO_PORT_CONFIG_INFO ConfigInfo,
                PUCHAR Again)
 {
-  /* FIXME: Determine if the adapter is present  */
-  *Again = FALSE;
+    VP_STATUS Status;
+
+    /* FIXME: Determine if the adapter is present  */
+    *Again = FALSE;
+
+    if (ConfigInfo->Length < sizeof(VIDEO_PORT_CONFIG_INFO))
+        return ERROR_INVALID_PARAMETER;
+
+    Status = VideoPortVerifyAccessRanges(DeviceExtension, ARRAYSIZE(VGAAccessRange), VGAAccessRange);
+    if (Status != NO_ERROR)
+        return Status;

-  ConfigInfo->VdmPhysicalVideoMemoryAddress.QuadPart = 0xa000;
-  ConfigInfo->VdmPhysicalVideoMemoryLength = 0x2000;
-  return  NO_ERROR;
+    ConfigInfo->VdmPhysicalVideoMemoryAddress = VGAAccessRange[2].RangeStart;
+    ConfigInfo->VdmPhysicalVideoMemoryLength = VGAAccessRange[2].RangeLength;
+    return NO_ERROR;

/* FIXME: Claim any necessary memory/IO resources for the adapter  */
   /* FIXME: Map resources into system memory for the adapter  */