From 32f9b796d3bb05f608d87d49e691249e5f04d13e Mon Sep 17 00:00:00 2001 From: jji4 Date: Fri, 20 Feb 2009 03:01:49 +0000 Subject: 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 --- DuetPkg/BootSector/Gpt.S | 297 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 297 insertions(+) create mode 100644 DuetPkg/BootSector/Gpt.S (limited to 'DuetPkg/BootSector/Gpt.S') 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 + + + -- cgit v1.2.3