From 022973aa4ffceb346ba8595babb471ca22917606 Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Tue, 11 Sep 2012 12:17:38 +0000
Subject: [PATCH] revert r57274. Looks like testbot doesn't like it.

svn path=/trunk/; revision=57275
---
 .../boot/freeldr/freeldr/arch/i386/hwdisk.c   | 47 +++++++------------
 .../boot/freeldr/freeldr/arch/i386/pcmem.c    |  9 ++--
 .../freeldr/include/arch/pc/x86common.h       |  6 +--
 3 files changed, 25 insertions(+), 37 deletions(-)

diff --git a/reactos/boot/freeldr/freeldr/arch/i386/hwdisk.c b/reactos/boot/freeldr/freeldr/arch/i386/hwdisk.c
index 4c469e61a8b..1eb5e84e950 100644
--- a/reactos/boot/freeldr/freeldr/arch/i386/hwdisk.c
+++ b/reactos/boot/freeldr/freeldr/arch/i386/hwdisk.c
@@ -113,47 +113,32 @@ static LONG DiskOpen(CHAR* Path, OPENMODE OpenMode, ULONG* FileId)
 static LONG DiskRead(ULONG FileId, VOID* Buffer, ULONG N, ULONG* Count)
 {
     DISKCONTEXT* Context = FsGetDeviceSpecific(FileId);
-    UCHAR      * Ptr = (UCHAR*)Buffer;
-    ULONG        Length, TotalSectors, MaxSectors, ReadSectors;
-    BOOLEAN      ret;
-    ULONGLONG    SectorOffset;
+    UCHAR* Ptr = (UCHAR*)Buffer;
+    ULONG i, Length;
+    BOOLEAN ret;
 
-    TotalSectors = (N + Context->SectorSize - 1) / Context->SectorSize;
-    MaxSectors   = DISKREADBUFFER_SIZE / Context->SectorSize;
-    SectorOffset = Context->SectorNumber + Context->SectorOffset;
-
-    ret = 0;
-
-    while (TotalSectors)
+    *Count = 0;
+    i = 0;
+    while (N > 0)
     {
-        ReadSectors = TotalSectors;
-        if (ReadSectors > MaxSectors)
-            ReadSectors = MaxSectors;
-
+        Length = N;
+        if (Length > Context->SectorSize)
+            Length = Context->SectorSize;
         ret = MachDiskReadLogicalSectors(
             Context->DriveNumber,
-            SectorOffset,
-            ReadSectors,
+            Context->SectorNumber + Context->SectorOffset + i,
+            1,
             (PVOID)DISKREADBUFFER);
         if (!ret)
-            break;
-
-        Length = ReadSectors * Context->SectorSize;
-        if (Length > N)
-            Length = N;
-
+            return EIO;
         RtlCopyMemory(Ptr, (PVOID)DISKREADBUFFER, Length);
-
         Ptr += Length;
-        N   -= Length;
-
-        SectorOffset += ReadSectors;
-        TotalSectors -= ReadSectors;
+        *Count += Length;
+        N -= Length;
+        i++;
     }
 
-    *Count = Ptr - (UCHAR *)Buffer;
-
-    return (!ret) ? EIO : ESUCCESS;
+    return ESUCCESS;
 }
 
 static LONG DiskSeek(ULONG FileId, LARGE_INTEGER* Position, SEEKMODE SeekMode)
diff --git a/reactos/boot/freeldr/freeldr/arch/i386/pcmem.c b/reactos/boot/freeldr/freeldr/arch/i386/pcmem.c
index 2c2536e66eb..8ee7354c1b1 100644
--- a/reactos/boot/freeldr/freeldr/arch/i386/pcmem.c
+++ b/reactos/boot/freeldr/freeldr/arch/i386/pcmem.c
@@ -29,13 +29,15 @@ DBG_DEFAULT_CHANNEL(MEMORY);
 
 #define MAX_BIOS_DESCRIPTORS 32
 #define FREELDR_BASE_PAGE  (FREELDR_BASE / PAGE_SIZE)
+#define FILEBUF_BASE_PAGE  (FILESYSBUFFER / PAGE_SIZE)
 #define DISKBUF_BASE_PAGE  (DISKREADBUFFER / PAGE_SIZE)
-#define STACK_BASE_PAGE    (STACKLOWLIMIT / PAGE_SIZE)
+#define STACK_BASE_PAGE    (DISKBUF_BASE_PAGE + 1)
 #define STACK_END_PAGE     (STACK32ADDR / PAGE_SIZE)
 #define BIOSBUF_BASE_PAGE  (BIOSCALLBUFFER / PAGE_SIZE)
 
-#define FREELDR_PAGE_COUNT (DISKBUF_BASE_PAGE - FREELDR_BASE_PAGE)
-#define DISKBUF_PAGE_COUNT (STACK_BASE_PAGE - DISKBUF_BASE_PAGE)
+#define FREELDR_PAGE_COUNT (FILEBUF_BASE_PAGE - FREELDR_BASE_PAGE)
+#define FILEBUF_PAGE_COUNT (DISKBUF_BASE_PAGE - FILEBUF_BASE_PAGE)
+#define DISKBUF_PAGE_COUNT (1)
 #define STACK_PAGE_COUNT   (STACK_END_PAGE - STACK_BASE_PAGE)
 #define BIOSBUF_PAGE_COUNT (1)
 
@@ -47,6 +49,7 @@ FREELDR_MEMORY_DESCRIPTOR PcMemoryMap[MAX_BIOS_DESCRIPTORS + 1] =
  { LoaderFirmwarePermanent, 0x00,               1 }, // realmode int vectors
  { LoaderFirmwareTemporary, 0x01,               FREELDR_BASE_PAGE - 1 }, // freeldr stack + cmdline
  { LoaderLoadedProgram,     FREELDR_BASE_PAGE,  FREELDR_PAGE_COUNT }, // freeldr image
+ { LoaderFirmwareTemporary, FILEBUF_BASE_PAGE,  FILEBUF_PAGE_COUNT }, // File system read buffer. FILESYSBUFFER
  { LoaderFirmwareTemporary, DISKBUF_BASE_PAGE,  DISKBUF_PAGE_COUNT }, // Disk read buffer for int 13h. DISKREADBUFFER
  { LoaderOsloaderStack,     STACK_BASE_PAGE,    STACK_PAGE_COUNT }, // prot mode stack.
  { LoaderFirmwareTemporary, BIOSBUF_BASE_PAGE,  BIOSBUF_PAGE_COUNT }, // BIOSCALLBUFFER
diff --git a/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h b/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
index e8c729704dc..b2205f0d138 100644
--- a/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
+++ b/reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h
@@ -13,12 +13,12 @@
 #define BSS_START           HEX(6F00)
 #define FREELDR_BASE        HEX(F800)
 #define FREELDR_PE_BASE    HEX(10000)
-#define DISKREADBUFFER     HEX(80000) /* Buffer to store data read in from the disk via the BIOS */
-#define STACKLOWLIMIT      HEX(90000)
+#define FILESYSBUFFER      HEX(80000) /* Buffer to store file system data (e.g. cluster buffer for FAT) */
+#define DISKREADBUFFER     HEX(90000) /* Buffer to store data read in from the disk via the BIOS */
 #define STACK32ADDR        HEX(98000) /* The 32-bit stack top will be at 9000:8000, or 0xA8000 */
 #define STACK64ADDR	       HEX(98000) /* The 64-bit stack top will be at 98000 */
 #define BIOSCALLBUFFER     HEX(98000) /* Buffer to store temporary data for any Int386() call */
-#define DISKREADBUFFER_SIZE HEX(10000)
+#define DISKREADBUFFER_SIZE 512
 
 #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 */