diff options
Diffstat (limited to 'DuetPkg/BootSector/Gpt.S')
| -rw-r--r-- | DuetPkg/BootSector/Gpt.S | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/DuetPkg/BootSector/Gpt.S b/DuetPkg/BootSector/Gpt.S new file mode 100644 index 0000000000..763513c7a0 --- /dev/null +++ b/DuetPkg/BootSector/Gpt.S @@ -0,0 +1,297 @@ +#------------------------------------------------------------------------------
+#*
+#* 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.
+#*
+#* gpt.asm
+#*
+#* Abstract:
+#*
+#------------------------------------------------------------------------------
+
+ #.MODEL small
+# .dosseg
+ .stack:
+ .486p:
+ .code:
+
+.equ BLOCK_SIZE, 0x0200
+.equ BLOCK_MASK, 0x01ff
+.equ BLOCK_SHIFT, 9
+
+# ****************************************************************************
+# Code loaded by BIOS at 0x0000:0x7C00
+# ****************************************************************************
+
+ .org 0x00
+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 GPT Header from hard disk to 0x0000:0x0800
+# ****************************************************************************
+ xorw %ax, %ax
+ movw %ax, %es # Read to 0x0000:0x0800
+ movw $0x800, %di # Read to 0x0000:0x0800
+ movl $1, %eax # Read LBA #1
+ movl $0, %edx # Read LBA #1
+ movw $1, %bx # Read 1 Block
+ pushw %es
+ call ReadBlocks
+ popw %es
+
+# ****************************************************************************
+# Read Target GPT Entry from hard disk to 0x0000:0x0A00
+# ****************************************************************************
+ cmpl $0x20494645, %es:(%di) # Check for "EFI "
+ jne BadGpt
+ cmpl $0x54524150, %es:4(%di) # Check for "PART"
+ jne BadGpt
+ cmpl $0x00010000, %es:8(%di) # Check Revision - 0x10000
+ jne BadGpt
+
+ movl %es:84(%di), %eax # EAX = SizeOfPartitionEntry
+ mulb GptPartitionIndicator(%bp) # EAX = SizeOfPartitionEntry * GptPartitionIndicator
+ movl %eax, %edx # EDX = SizeOfPartitionEntry * GptPartitionIndicator
+ shrl $BLOCK_SHIFT, %eax # EAX = (SizeOfPartitionEntry * GptPartitionIndicator) / BLOCK_SIZE
+ andl $BLOCK_MASK, %edx # EDX = Targer PartitionEntryLBA Offset
+ # = (SizeOfPartitionEntry * GptPartitionIndicator) % BLOCK_SIZE
+ pushl %edx
+ movl %es:72(%di), %ecx # ECX = PartitionEntryLBA (Low)
+ movl %es:76(%di), %ebx # EBX = PartitionEntryLBA (High)
+ addl %ecx, %eax # EAX = Target PartitionEntryLBA (Low)
+ # = (PartitionEntryLBA +
+ # (SizeOfPartitionEntry * GptPartitionIndicator) / BLOCK_SIZE)
+ adcl %ebx, %edx # EDX = Target PartitionEntryLBA (High)
+
+ movw $0xA00, %di # Read to 0x0000:0x0A00
+ movw $1, %bx # Read 1 Block
+ pushw %es
+ call ReadBlocks
+ popw %es
+
+# ****************************************************************************
+# Read Target DBR from hard disk to 0x0000:0x7C00
+# ****************************************************************************
+ popl %edx # EDX = (SizeOfPartitionEntry * GptPartitionIndicator) % BLOCK_SIZE
+ addw %dx, %di # DI = Targer PartitionEntryLBA Offset
+ cmpl $0xC12A7328, %es:(%di) # Check for EFI System Partition "C12A7328-F81F-11d2-BA4B-00A0C93EC93B"
+ jne BadGpt
+ cmpl $0x11d2F81F, %es:4(%di) #
+ jne BadGpt
+ cmpl $0xA0004BBA, %es:8(%di) #
+ jne BadGpt
+ cmpl $0x3BC93EC9, %es:0xc(%di) #
+ jne BadGpt
+
+ movl %es:32(%di), %eax # EAX = StartingLBA (Low)
+ movl %es:36(%di), %edx # EDX = StartingLBA (High)
+ movw $0x7C00, %di # Read to 0x0000:0x7C00
+ movw $1, %bx # Read 1 Block
+ call ReadBlocks
+
+# ****************************************************************************
+# Transfer control to BootSector - Jump to 0x0000:0x7C00
+# ****************************************************************************
+ xorw %ax, %ax
+ pushw %ax # PUSH 0x0000
+ movw $0x7c00, %di
+ pushw %di # PUSH 0x7C00
+ retl # JMP 0x0000:0x7C00
+
+# ****************************************************************************
+# ReadBlocks - Reads a set of blocks from a block device
+#
+# EDX:EAX = Start LBA
+# BX = Number of Blocks to Read (must < 127)
+# ES:DI = Buffer to store sectors read from disk
+# ****************************************************************************
+
+# si = DiskAddressPacket
+
+ReadBlocks:
+ pushal
+ pushw %ds
+ xorw %cx, %cx
+ movw %cx, %ds
+ movw $0x600, %bp # bp = 0x600
+ leaw AddressPacket(%bp), %si
+ movb %bl, %ds:2(%si) # 02 = Number Of Block transfered
+ movw %di, %ds:4(%si) # 04 = Transfer Buffer Offset
+ movw %es, %ds:6(%si) # 06 = Transfer Buffer Segment
+ movl %eax, %ds:8(%si) # 08 = Starting LBA (Low)
+ movl %edx, %ds:0xc(%si) # 0C = Starting LBA (High)
+ movb $0x42, %ah # ah = Function 42
+ movb PhysicalDrive(%bp), %dl # dl = Drive Number
+ int $0x13
+ jc BadGpt
+ popw %ds
+ popal
+ ret
+
+# ****************************************************************************
+# Address Packet used by ReadBlocks
+# ****************************************************************************
+AddressPacket:
+ .byte 0x10 # Size of address packet
+ .byte 0x0 # Reserved. Must be 0
+ .byte 0x1 # Read blocks at a time (To be fixed each times)
+ .byte 0x0 # Reserved. Must be 0
+ .word 0x000 # Destination Address offset (To be fixed each times)
+ .word 0x000 # Destination Address segment (To be fixed each times)
+AddressPacketLba:
+ .long 0x0,0x0 # Start LBA (To be fixed each times)
+AddressPacketEnd:
+
+# ****************************************************************************
+# ERROR Condition:
+# ****************************************************************************
+
+BadGpt:
+ movw $0xb800, %ax
+ movw %ax, %es
+ movw $0x60, %ax
+ movw %ax, %ds
+ leaw %cs:ErrorString, %si
+ movw $10, %cx
+ movw $320, %di
+ rep
+ movsw
+Halt:
+ jmp Halt
+
+StartString:
+ .byte 'G', 0x0c, 'P', 0x0c, 'T', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c
+ErrorString:
+ .byte 'G', 0x0c, 'P', 0x0c, 'T', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c
+
+# ****************************************************************************
+# PhysicalDrive - Used to indicate which disk to be boot
+# Can be patched by tool
+# ****************************************************************************
+ .org 0x01B6
+PhysicalDrive: .byte 0x80
+
+# ****************************************************************************
+# GptPartitionIndicator - Used to indicate which GPT partition to be boot
+# Can be patched by tool
+# ****************************************************************************
+ .org 0x01B7
+GptPartitionIndicator: .byte 0
+
+# ****************************************************************************
+# Unique MBR signature
+# ****************************************************************************
+ .org 0x01B8
+ .ascii "DUET"
+
+# ****************************************************************************
+# Unknown
+# ****************************************************************************
+ .org 0x01BC
+ .word 0
+
+# ****************************************************************************
+# PMBR Entry - Can be patched by tool
+# ****************************************************************************
+ .org 0x01BE
+ .byte 0 # Boot Indicator
+ .byte 0xff # Start Header
+ .byte 0xff # Start Sector
+ .byte 0xff # Start Track
+ .byte 0xee # OS Type
+ .byte 0xff # End Header
+ .byte 0xff # End Sector
+ .byte 0xff # End Track
+ .long 1 # Starting LBA
+ .long 0xFFFFFFFF # End LBA
+
+ .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
+
+
+
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