DuetPkg BootSector: Clean up .S files for 64-bit Duet for GCC build.

Partly contributed by Sergey Isakov [isakov-sl@bk.ru].

Signed-off-by: rsun3
Reviewed-by: niruiyu


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12921 6f19259b-4bc3-4df7-8a09-765794883524

DuetPkg/BootSector/st32_64.S

@@ -1,6 +1,6 @@
 #------------------------------------------------------------------------------
 #*
-#*   Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
+#*   Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
 #*   This program and the accompanying materials                          
 #*   are licensed and made available under the terms and conditions of the BSD License         
 #*   which accompanies this distribution.  The full text of the license may be found at        
@@ -27,6 +27,10 @@
 .equ                        BLOCK_SHIFT, 9
 
        .org 0x0
+
+.global _start
+_start:
+
 Ia32Jump: 
   jmp   BootSectorEntryPoint  # JMP inst    - 3 bytes
   nop
@@ -138,11 +142,11 @@ CheckEm64T:
         movw $18,%cx
         jmp  PrintStringAndHalt
 CheckEm64TPass: 
-jumpFarInstruction: 
+JumpFarInstruction: 
         .byte 0xea
-jumpOffset: 
+JumpOffset: 
         .word 0x200
-jumpSegment: 
+JumpSegment: 
         .word 0x2000
 
 
@@ -446,7 +450,7 @@ A20GateEnabled:
     #
     # Enable Protect Mode (set CR0.PE=1)
     #
-    movl  $cr0, %eax      # Read CR0.
+    movl  %cr0, %eax      # Read CR0.
     orl   $0x1,%eax       # Set PE=1
     movl  %eax, %cr0      # Write CR0.
     .byte 0x66
@@ -518,7 +522,7 @@ In32BitProtectedMode:
     #
     # Enable paging to activate long mode (set CR0.PG=1)
     #
-    movl  $cr0, %eax      # Read CR0.
+    movl  %cr0, %eax      # Read CR0.
     .byte 0xf
     .byte 0xba
     .byte 0xe8
@@ -1113,10 +1117,9 @@ MemoryMap:  .long 0,0,0,0,0,0,0,0
         .long 0,0,0,0,0,0,0,0
         .long 0,0,0,0,0,0,0,0
 
-        .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
         .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 
-        #.org 0x0fe0  #Just for pass build
+        .org 0x0fe0
 MyStack:    
         # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
         #    back to INT 08h - 0fh  when in real mode...  It is 'org'ed to a
@@ -1148,7 +1151,7 @@ MyStack:
         iret
 
 
-        #.org 0x0ffe #Just for pass build
+        .org 0x0ffe
 BlockSignature: 
         .word 0xaa55