Port Intel .asm to GNU .S

These .S files now is not for compiler but for us to control the version.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7549 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 258 insertions, 0 deletions

diff --git a/DuetPkg/BootSector/Mbr.S b/DuetPkg/BootSector/Mbr.S
new file mode 100644
index 0000000..e69fb99
--- /dev/null
+++ b/DuetPkg/BootSector/Mbr.S
@@ -0,0 +1,258 @@
+#------------------------------------------------------------------------------
+#*
+#*   Copyright 2006 - 2007, Intel Corporation                                                         
+#*   All rights reserved. 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
+#*   http://opensource.org/licenses/bsd-license.php
+#*
+#*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#*
+#*    Mbr.asm
+#*
+#*   Abstract:
+#*
+#------------------------------------------------------------------------------
+
+.equ                      BLOCK_SIZE, 0x0200
+.equ                      BLOCK_MASK, 0x01ff
+.equ                      BLOCK_SHIFT, 9
+
+# ****************************************************************************
+# Code loaded by BIOS at 0x0000:0x7C00
+# ****************************************************************************
+
+.org 0x0
+Start: 
+
+# ****************************************************************************
+# Start Print
+# ****************************************************************************
+
+        movw $0xb800, %ax
+        movw %ax, %es
+        movw $0x7c0, %ax
+        movw %ax, %ds
+        leaw %cs:StartString, %si
+        movw $10, %cx
+        movw $160, %di
+        rep 
+        movsw
+
+# ****************************************************************************
+# Print over
+# ****************************************************************************
+
+# ****************************************************************************
+# Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600
+# ****************************************************************************
+        xorw  %ax, %ax                            # AX = 0x0000
+        movw  $0x7c00, %bx                        # BX = 0x7C00
+        movw  $0x600, %bp                         # BP = 0x0600
+        movw  RelocatedStart, %si                 # SI = Offset(RelocatedStart)
+        movw  $0x200, %cx                         # CX = 0x0200
+        subw  %si, %cx                            # CS = 0x0200 - Offset(RelocatedStart)
+        leaw  (%bp,%si,), %di                     # DI = 0x0600 + Offset(RelocatedStart)
+        leaw  (%bx,%si,), %si                     # BX = 0x7C00 + Offset(RelocatedStart)
+        movw  %ax, %ss                            # SS = 0x0000
+        movw  %bx, %sp                            # SP = 0x7C00
+        movw  %ax, %es                            # ES = 0x0000
+        movw  %ax, %ds                            # DS = 0x0000
+        pushw %ax                                 # PUSH 0x0000
+        pushw %di                                 # PUSH 0x0600 + Offset(RelocatedStart)
+        cld                                       # Clear the direction flag
+        rep
+        movsb                                     # Copy 0x0200 bytes from 0x7C00 to 0x0600
+        retl                                      # JMP 0x0000:0x0600 + Offset(RelocatedStart)
+
+# ****************************************************************************
+# Code relocated to 0x0000:0x0600
+# ****************************************************************************
+
+RelocatedStart: 
+# ****************************************************************************
+# Get Driver Parameters to 0x0000:0x7BFC
+# ****************************************************************************
+
+        xorw  %ax, %ax                            # AX = 0
+        movw  %ax, %ss                            # SS = 0
+        addw  $0x1000, %ax
+        movw  %ax, %ds
+
+        movw  $0x7c00, %sp                        # SP = 0x7c00
+        movw  %sp, %bp                            # BP = 0x7c00
+
+        movb  $8, %ah                             # AH = 8 - Get Drive Parameters Function
+        movb  %dl, PhysicalDrive(%bp)             # BBS defines that BIOS would pass the booting driver number to the loader through DL
+        int   $0x13                               # Get Drive Parameters
+        xorw  %ax, %ax                            # AX = 0
+        movb  %dh, %al                            # AL = DH
+        incb  %al                                 # MaxHead = AL + 1
+        pushw %ax                                 # 0000:7bfe = MaxHead
+        movb  %cl, %al                            # AL = CL
+        andb  $0x3f, %al                          # MaxSector = AL & 0x3f
+        pushw %ax                                 # 0000:7bfc = MaxSector
+
+# ****************************************************************************
+# Read Target DBR from hard disk to 0x0000:0x7C00
+# ****************************************************************************
+
+        xorw  %ax, %ax
+        movb  MbrPartitionIndicator(%bp), %al          # AX = MbrPartitionIndex
+        cmpb  $0xff, %al                               # 0xFF means do legacy MBR boot
+        jnz   EfiDbr
+LegacyMbr: 
+        movl  $0x0000600, %eax                    # Assume LegacyMBR is backuped in Sector 6
+        jmp   StartReadTo7C00                     # EAX = Header/Sector/Tracker/Zero
+
+EfiDbr: 
+        cmpb  $4, %al                             # MbrPartitionIndex should < 4
+        jae   BadDbr
+        shlw  $4, %ax                             # AX  = MBREntrySize * Index
+        addw  $0x1be, %ax                         # AX  = MBREntryOffset
+        movw  %ax, %di                            # DI  = MBREntryOffset
+
+        # Here we don't use the C/H/S information provided by Partition table
+        #  but calculate C/H/S from LBA ourselves
+        #       Ci: Cylinder number
+        #       Hi: Header number
+        #       Si: Sector number
+        movl  %es:8(%bp,%di,), %eax               # Start LBA
+        movl  %eax, %edx
+        shrl  $16, %edx                           # DX:AX = Start LBA
+                                                  #       = Ci * (H * S) + Hi * S + (Si - 1)
+
+        # Calculate C/H/S according to LBA
+        movw  $0x7bfa, %bp
+        divw  2(%bp)                              # AX = Hi + H*Ci
+                                                  # DX = Si - 1
+        incw  %dx                                 # DX = Si
+        pushw %dx                                 # 0000:7bfa = Si  <----
+        xorw  %dx, %dx                            # DX:AX = Hi + H*Ci
+        divw  4(%bp)                              # AX = Ci         <----
+                                                  # DX = Hi         <----
+
+StartReadTo7C00: 
+
+        movb  (%bp), %cl                          # Si
+        movb  %al, %ch                            # Ci[0-7]
+        orb   %ah, %cl                            # Ci[8,9]
+        movw  $0x7c00, %bx                        # ES:BX = 0000:7C00h
+        movb  $0x2, %ah                           # Function 02h
+        movb  $1, %al                             # 1 Sector
+        movb  %dl, %dh                            # Hi
+        movw  $0x600, %bp
+        movb  PhysicalDrive(%bp), %dl             # Drive number
+        int   $0x13
+        jc    BadDbr
+
+
+
+# ****************************************************************************
+# Transfer control to BootSector - Jump to 0x0000:0x7C00
+# ****************************************************************************
+        xorw  %ax, %ax
+        pushw %ax                                 # PUSH 0x0000 - Segment
+        movw  $0x7c00, %di
+        pushw %di                                 # PUSH 0x7C00 - Offset
+        retl                                      # JMP 0x0000:0x7C00
+
+# ****************************************************************************
+# ERROR Condition:
+# ****************************************************************************
+
+BadDbr: 
+    pushw %ax
+    movw $0xb800, %ax
+    movw %ax, %es
+    movw $0x60, %ax
+    movw %ax, %ds
+    leaw %cs:ErrorString, %si
+    movw $320, %di
+    popw %ax
+    call A2C
+    movb %ah, 16(%si)
+    movb %al, 18(%si)
+    movw $10, %cx
+    rep
+    movsw
+Halt: 
+    jmp   Halt
+
+StartString: 
+.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c
+ErrorString: 
+.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, ':', 0x0c, '?', 0x0c, '?', 0x0c
+
+# ****************************************************************************
+# A2C - convert Ascii code stored in AH to character stored in AX
+# ****************************************************************************
+A2C: 
+    movb %ah, %al
+    shrb $4, %ah
+    andb $0xF, %al
+    addb '0', %ah
+    addb '0', %al
+
+    cmpb '9', %ah
+    jle  A2C_L1
+    addb $7, %ah
+A2C_L1: 
+
+    cmpb '9', %al
+    jle A2C_L2
+    addb $7, %al
+A2C_L2: 
+    ret
+
+
+# ****************************************************************************
+# PhysicalDrive - Used to indicate which disk to be boot
+#                 Can be patched by tool
+# ****************************************************************************
+.org   0x01B6
+PhysicalDrive:        .byte 0x80
+
+# ****************************************************************************
+# MbrPartitionIndicator - Used to indicate which MBR partition to be boot
+#                         Can be patched by tool
+#                         OxFF means boot to legacy MBR. (LBA OFFSET 6)
+# ****************************************************************************
+.org   0x01B7
+MbrPartitionIndicator: .byte 0
+
+# ****************************************************************************
+# Unique MBR signature
+# ****************************************************************************
+.org   0x01B8
+    .ascii "DUET"
+
+# ****************************************************************************
+# Unknown
+# ****************************************************************************
+.org   0x01BC
+    .word 0
+
+# ****************************************************************************
+# MBR Entry - To be patched
+# ****************************************************************************
+.org   0x01BE
+    .long 0,0,0,0
+.org   0x01CE
+    .long 0,0,0,0
+.org   0x01DE
+    .long 0,0,0,0
+.org   0x01EE
+    .long 0,0,0,0
+
+# ****************************************************************************
+# Sector Signature
+# ****************************************************************************
+
+.org 0x01FE
+SectorSignature: 
+  .word     0xaa55      # Boot Sector Signature
+
+
+