[FREELDR]

Fix/improve range check. 
CORE-8995 #resolve 
CORE-8997 #resolve

svn path=/trunk/; revision=66091

reactos/boot/freeldr/freeldr/arch/i386/pcmem.c

@@ -203,7 +203,7 @@ PcMemGetBiosMemoryMap(PFREELDR_MEMORY_DESCRIPTOR MemoryMap, ULONG MaxMemoryMapSi
     REGS Regs;
     ULONGLONG RealBaseAddress, EndAddress, RealSize;
     TYPE_OF_MEMORY MemoryType;
-    ULONG Size;
+    ULONG Size, RequiredSize;
     ASSERT(PcBiosMapCount == 0);
 
     TRACE("GetBiosMemoryMap()\n");
@@ -212,18 +212,19 @@ PcMemGetBiosMemoryMap(PFREELDR_MEMORY_DESCRIPTOR MemoryMap, ULONG MaxMemoryMapSi
        bit value at address 0x413 inside the BDA, which gives us the usable size
        in KB */
     Size = (*(PUSHORT)(ULONG_PTR)0x413) * 1024;
-    if (Size < MEMORY_MARGIN)
+    RequiredSize = FREELDR_BASE + FrLdrImageSize + PAGE_SIZE;
+    if (Size < RequiredSize)
     {
         FrLdrBugCheckWithMessage(
             MEMORY_INIT_FAILURE,
             __FILE__,
             __LINE__,
-            "The BIOS reported a usable memory range up to 0x%x, which is too small!\n\n"
+            "The BIOS reported a usable memory range up to 0x%x, which is too small!\n"
+            "Required size is 0x%x\n\n"
             "If you see this, please report to the ReactOS team!",
-            Size);
+            Size, RequiredSize);
     }
 
-
     /* Int 15h AX=E820h
      * Newer BIOSes - GET SYSTEM MEMORY MAP
      *

reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h

@@ -16,7 +16,7 @@
 #define STACKADDR           HEX(F000) /* The 32/64-bit stack top will be at 0000:F000, or 0xF000 */
 #define FREELDR_BASE        HEX(F800)
 #define FREELDR_PE_BASE    HEX(10000)
-#define MEMORY_MARGIN      HEX(90000) /* We need this much memory */
+#define MEMORY_MARGIN      HEX(88000) /* We need this much memory */
 
 #define BIOSCALLBUFSEGMENT (BIOSCALLBUFFER/16) /* Buffer to store temporary data for any Int386() call */
 #define BIOSCALLBUFOFFSET   HEX(0000) /* Buffer to store temporary data for any Int386() call */