[FREELDR/x64] Allow using memory above 4GB on x64

[reactos.git] / boot / freeldr / freeldr / include / mm.h

diff --git a/boot/freeldr/freeldr/include/mm.h b/boot/freeldr/freeldr/include/mm.h
index dd1bb19..a3f34a5 100644 (file)
--- a/boot/freeldr/freeldr/include/mm.h
+++ b/boot/freeldr/freeldr/include/mm.h
@@ -51,7 +51,12 @@ typedef struct _FREELDR_MEMORY_DESCRIPTOR
 #define MM_PAGE_SIZE    4096
 #define MM_PAGE_MASK    0xFFF
 #define MM_PAGE_SHIFT    12
-#define MM_MAX_PAGE        0xFFFFF
+#if defined(_X86PAE_)
+#define MM_MAX_PAGE        0x3FFFFFF /* 26 bits for the PFN */
+#else
+#define MM_MAX_PAGE        0xFFFFF /* 20 bits for the PFN */
+#endif
+#define MM_MAX_PAGE_LOADER 0xFFFFF /* 4 GB flat address range */
 
 #define MM_SIZE_TO_PAGES(a)  \
     ( ((a) >> MM_PAGE_SHIFT) + ((a) & MM_PAGE_MASK ? 1 : 0) )
@@ -63,7 +68,8 @@ typedef struct _FREELDR_MEMORY_DESCRIPTOR
 #define MM_PAGE_SIZE    4096
 #define MM_PAGE_MASK    0xFFF
 #define MM_PAGE_SHIFT    12
-#define MM_MAX_PAGE     0x3FFFF /* freeldr only maps 1 GB */
+#define MM_MAX_PAGE        0xFFFFFFFFF /* 36 bits for the PFN */
+#define MM_MAX_PAGE_LOADER 0x3FFFF /* on x64 freeldr only maps 1 GB */
 
 #define MM_SIZE_TO_PAGES(a)  \
     ( ((a) >> MM_PAGE_SHIFT) + ((a) & MM_PAGE_MASK ? 1 : 0) )