From 93e6fa1b012c75e5f4997437025c28d997008428 Mon Sep 17 00:00:00 2001
From: Aleksandar Andrejevic <aandrejevic@reactos.org>
Date: Wed, 6 May 2015 23:06:28 +0000
Subject: [PATCH] [NTVDM] Implement EMS function AH = 59h (Get Expanded Memory
 Hardware Information).

svn path=/trunk/; revision=67585
---
 .../mvdm/ntvdm/dos/dos32krnl/emsdrv.c         | 30 +++++++++++++++++++
 .../mvdm/ntvdm/dos/dos32krnl/emsdrv.h         |  9 ++++++
 2 files changed, 39 insertions(+)

diff --git a/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c b/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c
index 041bc02b470..32f132900bc 100644
--- a/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c
+++ b/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.c
@@ -361,6 +361,36 @@ static VOID WINAPI EmsIntHandler(LPWORD Stack)
             break;
         }
 
+        /* Get Expanded Memory Hardware Information */
+        case 0x59:
+        {
+            if (getAL() == 0x00)
+            {
+                PEMS_HARDWARE_INFO HardwareInfo = (PEMS_HARDWARE_INFO)SEG_OFF_TO_PTR(getES(), getDI());
+
+                /* Return the hardware information */
+                HardwareInfo->RawPageSize         = EMS_PAGE_SIZE >> 4;
+                HardwareInfo->AlternateRegSets    = 0;
+                HardwareInfo->ContextAreaSize     = sizeof(Mapping);
+                HardwareInfo->DmaRegisterSets     = 0;
+                HardwareInfo->DmaChannelOperation = 0;
+            }
+            else if (getAL() == 0x01)
+            {
+                /* Same as function AH = 42h */
+                setAH(EMS_STATUS_OK);
+                setBX(RtlNumberOfClearBits(&AllocBitmap));
+                setDX(EmsTotalPages);
+            }
+            else
+            {
+                DPRINT1("Invalid subfunction %02X for EMS function AH = 59h\n", getAL());
+                setAH(EMS_STATUS_UNKNOWN_FUNCTION);
+            }
+
+            break;
+        }
+
         default:
         {
             DPRINT1("EMS function AH = %02X NOT IMPLEMENTED\n", getAH());
diff --git a/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h b/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h
index e3bf33b0046..0bfd52110cf 100644
--- a/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h
+++ b/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h
@@ -58,6 +58,15 @@ typedef struct _EMS_COPY_DATA
     USHORT DestSegment;
 } EMS_COPY_DATA, *PEMS_COPY_DATA;
 
+typedef struct _EMS_HARDWARE_INFO
+{
+    WORD RawPageSize;
+    WORD AlternateRegSets;
+    WORD ContextAreaSize;
+    WORD DmaRegisterSets;
+    WORD DmaChannelOperation;
+} EMS_HARDWARE_INFO, *PEMS_HARDWARE_INFO;
+
 #pragma pack(pop)
 
 #endif