From c69dd9dfad3eb97d5e21f520f3ba35d102ec4cfa Mon Sep 17 00:00:00 2001 From: klu2 Date: Thu, 17 Apr 2008 05:48:13 +0000 Subject: Porting Duet module from EDKI to EDKII git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5076 6f19259b-4bc3-4df7-8a09-765794883524 --- DuetPkg/BootSector/Gpt.asm | 294 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 294 insertions(+) create mode 100644 DuetPkg/BootSector/Gpt.asm (limited to 'DuetPkg/BootSector/Gpt.asm') diff --git a/DuetPkg/BootSector/Gpt.asm b/DuetPkg/BootSector/Gpt.asm new file mode 100644 index 0000000000..15f91f5f49 --- /dev/null +++ b/DuetPkg/BootSector/Gpt.asm @@ -0,0 +1,294 @@ +;------------------------------------------------------------------------------ +;* +;* 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 + +BLOCK_SIZE EQU 0200h +BLOCK_MASK EQU 01ffh +BLOCK_SHIFT EQU 9 + +; **************************************************************************** +; Code loaded by BIOS at 0x0000:0x7C00 +; **************************************************************************** + + org 0h +Start: + +; **************************************************************************** +; Start Print +; **************************************************************************** + + mov ax,0b800h + mov es,ax + mov ax, 07c0h + mov ds, ax + lea si, cs:[StartString] + mov cx, 10 + mov di, 160 + rep movsw + +; **************************************************************************** +; Print over +; **************************************************************************** + +; **************************************************************************** +; Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600 +; **************************************************************************** + xor ax, ax ; AX = 0x0000 + mov bx, 07c00h ; BX = 0x7C00 + mov bp, 0600h ; BP = 0x0600 + mov si, OFFSET RelocatedStart ; SI = Offset(RelocatedStart) + mov cx, 0200h ; CX = 0x0200 + sub cx, si ; CS = 0x0200 - Offset(RelocatedStart) + lea di, [bp+si] ; DI = 0x0600 + Offset(RelocatedStart) + lea si, [bx+si] ; BX = 0x7C00 + Offset(RelocatedStart) + mov ss, ax ; SS = 0x0000 + mov sp, bx ; SP = 0x7C00 + mov es,ax ; ES = 0x0000 + mov ds,ax ; DS = 0x0000 + push ax ; PUSH 0x0000 + push di ; PUSH 0x0600 + Offset(RelocatedStart) + cld ; Clear the direction flag + rep movsb ; Copy 0x0200 bytes from 0x7C00 to 0x0600 + retf ; JMP 0x0000:0x0600 + Offset(RelocatedStart) + +; **************************************************************************** +; Code relocated to 0x0000:0x0600 +; **************************************************************************** + +RelocatedStart: +; **************************************************************************** +; Get Driver Parameters to 0x0000:0x7BFC +; **************************************************************************** + xor ax,ax ; ax = 0 + mov ss,ax ; ss = 0 + add ax,1000h + mov ds,ax + + mov sp,07c00h ; sp = 0x7c00 + mov bp,sp ; bp = 0x7c00 + + mov ah,8 ; ah = 8 - Get Drive Parameters Function + mov byte ptr [bp+PhysicalDrive],dl ; BBS defines that BIOS would pass the booting driver number to the loader through DL + int 13h ; Get Drive Parameters + xor ax,ax ; ax = 0 + mov al,dh ; al = dh + inc al ; MaxHead = al + 1 + push ax ; 0000:7bfe = MaxHead + mov al,cl ; al = cl + and al,03fh ; MaxSector = al & 0x3f + push ax ; 0000:7bfc = MaxSector + +; **************************************************************************** +; Read GPT Header from hard disk to 0x0000:0x0800 +; **************************************************************************** + xor ax, ax + mov es, ax ; Read to 0x0000:0x0800 + mov di, 0800h ; Read to 0x0000:0x0800 + mov eax, 1 ; Read LBA #1 + mov edx, 0 ; Read LBA #1 + mov bx, 1 ; Read 1 Block + push es + call ReadBlocks + pop es + +; **************************************************************************** +; Read Target GPT Entry from hard disk to 0x0000:0x0A00 +; **************************************************************************** + cmp dword ptr es:[di], 020494645h ; Check for "EFI " + jne BadGpt + cmp dword ptr es:[di + 4], 054524150h ; Check for "PART" + jne BadGpt + cmp dword ptr es:[di + 8], 000010000h ; Check Revision - 0x10000 + jne BadGpt + + mov eax, dword ptr es:[di + 84] ; EAX = SizeOfPartitionEntry + mul byte ptr [bp+GptPartitionIndicator] ; EAX = SizeOfPartitionEntry * GptPartitionIndicator + mov edx, eax ; EDX = SizeOfPartitionEntry * GptPartitionIndicator + shr eax, BLOCK_SHIFT ; EAX = (SizeOfPartitionEntry * GptPartitionIndicator) / BLOCK_SIZE + and edx, BLOCK_MASK ; EDX = Targer PartitionEntryLBA Offset + ; = (SizeOfPartitionEntry * GptPartitionIndicator) % BLOCK_SIZE + push edx + mov ecx, dword ptr es:[di + 72] ; ECX = PartitionEntryLBA (Low) + mov ebx, dword ptr es:[di + 76] ; EBX = PartitionEntryLBA (High) + add eax, ecx ; EAX = Target PartitionEntryLBA (Low) + ; = (PartitionEntryLBA + + ; (SizeOfPartitionEntry * GptPartitionIndicator) / BLOCK_SIZE) + adc edx, ebx ; EDX = Target PartitionEntryLBA (High) + + mov di, 0A00h ; Read to 0x0000:0x0A00 + mov bx, 1 ; Read 1 Block + push es + call ReadBlocks + pop es + +; **************************************************************************** +; Read Target DBR from hard disk to 0x0000:0x7C00 +; **************************************************************************** + pop edx ; EDX = (SizeOfPartitionEntry * GptPartitionIndicator) % BLOCK_SIZE + add di, dx ; DI = Targer PartitionEntryLBA Offset + cmp dword ptr es:[di], 0C12A7328h ; Check for EFI System Partition "C12A7328-F81F-11d2-BA4B-00A0C93EC93B" + jne BadGpt + cmp dword ptr es:[di + 4], 011d2F81Fh ; + jne BadGpt + cmp dword ptr es:[di + 8], 0A0004BBAh ; + jne BadGpt + cmp dword ptr es:[di + 0ch], 03BC93EC9h ; + jne BadGpt + + mov eax, dword ptr es:[di + 32] ; EAX = StartingLBA (Low) + mov edx, dword ptr es:[di + 36] ; EDX = StartingLBA (High) + mov di, 07C00h ; Read to 0x0000:0x7C00 + mov bx, 1 ; Read 1 Block + call ReadBlocks + +; **************************************************************************** +; Transfer control to BootSector - Jump to 0x0000:0x7C00 +; **************************************************************************** + xor ax, ax + push ax ; PUSH 0x0000 + mov di, 07c00h + push di ; PUSH 0x7C00 + retf ; 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: + pushad + push ds + xor cx, cx + mov ds, cx + mov bp, 0600h ; bp = 0x600 + lea si, [bp + OFFSET AddressPacket] ; DS:SI = Disk Address Packet + mov BYTE PTR ds:[si+2],bl ; 02 = Number Of Block transfered + mov WORD PTR ds:[si+4],di ; 04 = Transfer Buffer Offset + mov WORD PTR ds:[si+6],es ; 06 = Transfer Buffer Segment + mov DWORD PTR ds:[si+8],eax ; 08 = Starting LBA (Low) + mov DWORD PTR ds:[si+0ch],edx ; 0C = Starting LBA (High) + mov ah, 42h ; ah = Function 42 + mov dl,byte ptr [bp+PhysicalDrive] ; dl = Drive Number + int 13h + jc BadGpt + pop ds + popad + ret + +; **************************************************************************** +; Address Packet used by ReadBlocks +; **************************************************************************** +AddressPacket: + db 10h ; Size of address packet + db 00h ; Reserved. Must be 0 + db 01h ; Read blocks at a time (To be fixed each times) + db 00h ; Reserved. Must be 0 + dw 0000h ; Destination Address offset (To be fixed each times) + dw 0000h ; Destination Address segment (To be fixed each times) +AddressPacketLba: + dd 0h, 0h ; Start LBA (To be fixed each times) +AddressPacketEnd: + +; **************************************************************************** +; ERROR Condition: +; **************************************************************************** + +BadGpt: + mov ax,0b800h + mov es,ax + mov ax, 060h + mov ds, ax + lea si, cs:[ErrorString] + mov cx, 10 + mov di, 320 + rep movsw +Halt: + jmp Halt + +StartString: + db 'G', 0ch, 'P', 0ch, 'T', 0ch, ' ', 0ch, 'S', 0ch, 't', 0ch, 'a', 0ch, 'r', 0ch, 't', 0ch, '!', 0ch +ErrorString: + db 'G', 0ch, 'P', 0ch, 'T', 0ch, ' ', 0ch, 'E', 0ch, 'r', 0ch, 'r', 0ch, 'o', 0ch, 'r', 0ch, '!', 0ch + +; **************************************************************************** +; PhysicalDrive - Used to indicate which disk to be boot +; Can be patched by tool +; **************************************************************************** + org 01B6h +PhysicalDrive db 80h + +; **************************************************************************** +; GptPartitionIndicator - Used to indicate which GPT partition to be boot +; Can be patched by tool +; **************************************************************************** + org 01B7h +GptPartitionIndicator db 0 + +; **************************************************************************** +; Unique MBR signature +; **************************************************************************** + org 01B8h + db 'DUET' + +; **************************************************************************** +; Unknown +; **************************************************************************** + org 01BCh + dw 0 + +; **************************************************************************** +; PMBR Entry - Can be patched by tool +; **************************************************************************** + org 01BEh + db 0 ; Boot Indicator + db 0ffh ; Start Header + db 0ffh ; Start Sector + db 0ffh ; Start Track + db 0eeh ; OS Type + db 0ffh ; End Header + db 0ffh ; End Sector + db 0ffh ; End Track + dd 1 ; Starting LBA + dd 0FFFFFFFFh ; End LBA + + org 01CEh + dd 0, 0, 0, 0 + org 01DEh + dd 0, 0, 0, 0 + org 01EEh + dd 0, 0, 0, 0 + +; **************************************************************************** +; Sector Signature +; **************************************************************************** + + org 01FEh +SectorSignature: + dw 0aa55h ; Boot Sector Signature + + end + -- cgit v1.2.3