Author: hpoussin
Date: Thu Oct 30 20:22:57 2014
New Revision: 65127
URL: http://svn.reactos.org/svn/reactos?rev=65127&view=rev
Log:
[FREELDR] Move down the requirement of highest usable address
This fixes PXE boot in QEMU, where highest usable address is 0x9c400.
Modified:
trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
Modified: trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h?rev=65127&r1=65126&r2=65127&view=diff
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
[iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
[iso-8859-1] Thu Oct 30 20:22:57 2014
@@ -17,14 +17,14 @@
#define FREELDR_BASE HEX(F800)
#define FREELDR_PE_BASE HEX(10000)
#define DISKREADBUFFER HEX(8E000) /* Buffer to store data read in from the
disk via the BIOS */
-#define MEMORY_MARGIN HEX(9E000) /* Highest usable address */
+#define MEMORY_MARGIN HEX(9C000) /* Highest usable address */
/* 9F000- 9FFFF is reserved for the EBDA */
-#define DISKREADBUFFER_SIZE HEX(10000)
#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 */
#define BIOSCALLBUFSIZE PAGE_SIZE /* max is sizeof(VESA_SVGA_INFO) = 512 */
#define MAX_FREELDR_PE_SIZE (DISKREADBUFFER - FREELDR_PE_BASE)
+#define DISKREADBUFFER_SIZE (MEMORY_MARGIN - DISKREADBUFFER)
/* These addresses specify the realmode "BSS section" layout */
#define BSS_RealModeEntry (BSS_START + 0)
