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@7548 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
297
DuetPkg/BootSector/Gpt.S
Normal file
297
DuetPkg/BootSector/Gpt.S
Normal file
@@ -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
|
||||
|
||||
|
||||
|
Reference in New Issue
Block a user