X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=DuetPkg%2FBootSector%2Fbootsect.S;fp=DuetPkg%2FBootSector%2Fbootsect.S;h=0000000000000000000000000000000000000000;hp=5993a1ac99310cb5875e18431598483b3b486881;hb=9fb5c5c4a33248764b24cb710b56d6c32ce237b4;hpb=8efc6d84ca41e692cc60702e1f27276f7883b6db diff --git a/DuetPkg/BootSector/bootsect.S b/DuetPkg/BootSector/bootsect.S deleted file mode 100644 index 5993a1ac99..0000000000 --- a/DuetPkg/BootSector/bootsect.S +++ /dev/null @@ -1,303 +0,0 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright (c) 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. -#* -#* bootsect.S -#* -#* bootsect.S is built as 16-bit binary file in 512 bytes and patched to disk/partition's -#* first section - boot sector. -#* -#* The startup sequence for DUET disk boot sector is: -#* -#* 1, LegacyBios check 0xAA55 signature at boot sectore offset 0x1FE to judget -#* whether disk/partition is bootable. -#* 2, LegacyBios will load boot sector to 0x7c00 in real mode, pass BPB data and -#* hand off control to 0x7c00 code. -#* 3, boot sector code simply parse FAT format in boot disk and find EfiLdr binary file -#* and EfiVar.bin if exists. For first boot, EfiVar.bin does not exist. -#* 4, boot sector load the first sector of EfiLdr binary which is start.com to -#* 0x2000:0x0000 address. -#* 5, boot sector handoff control to 0x2000:0x0000 for start.com binary. -#* -#------------------------------------------------------------------------------ - - .stack: - .486p: - .code16 - -.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020 -.equ FAT_DIRECTORY_ENTRY_SHIFT, 5 -.equ BLOCK_SIZE, 0x0200 -.equ BLOCK_MASK, 0x01ff -.equ BLOCK_SHIFT, 9 - # "EFILDR_____" -.equ LOADER_FILENAME_PART1, 0x04c494645 # "EFIL" -.equ LOADER_FILENAME_PART2, 0x020205244 # "DR__" -.equ LOADER_FILENAME_PART3, 0x020202020 # "____" - - .org 0x0 -.global _start -_start: -Ia32Jump: - jmp BootSectorEntryPoint # JMP inst - 3 bytes - nop - -OemId: .ascii "INTEL " # OemId - 8 bytes -# BPB data below will be fixed by tool -SectorSize: .word 0 # Sector Size - 16 bits -SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits -ReservedSectors: .word 0 # Reserved Sectors - 16 bits -NoFats: .byte 0 # Number of FATs - 8 bits -RootEntries: .word 0 # Root Entries - 16 bits -Sectors: .word 0 # Number of Sectors - 16 bits -Media: .byte 0 # Media - 8 bits - ignored -SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits -SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored -Heads: .word 0 # Heads - 16 bits - ignored -HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored -LargeSectors: .long 0 # Large Sectors - 32 bits -PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored -CurrentHead: .byte 0 # Current Head - 8 bits -Signature: .byte 0 # Signature - 8 bits - ignored -VolId: .ascii " " # Volume Serial Number- 4 bytes -FatLabel: .ascii " " # Label - 11 bytes -SystemId: .ascii "FAT12 " # SystemId - 8 bytes - -BootSectorEntryPoint: - #ASSUME ds:@code - #ASSUME ss:@code - -# **************************************************************************** -# Start Print -# **************************************************************************** - movw $StartString, %si - call PrintString - -# **************************************************************************** -# Print over -# **************************************************************************** - - movw %cs, %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 - - cmpw $0xaa55, SectorSignature(%bp) # Verify Boot Sector Signature - jne BadBootSector - movw RootEntries(%bp), %cx # cx = RootEntries - shlw $FAT_DIRECTORY_ENTRY_SHIFT, %cx # cx = cx * 32 = cx * sizeof(FAT_DIRECTORY_ENTRY) = Size of Root Directory in bytes - movw %cx, %bx # bx = size of the Root Directory in bytes - andw $BLOCK_MASK, %bx # See if it is an even number of sectors long - jne BadBootSector # If is isn't, then the boot sector is bad. - movw %cx, %bx # bx = size of the Root Directory in bytes - shrw $BLOCK_SHIFT, %bx # bx = size of Root Directory in sectors - movb NoFats(%bp), %al # al = NoFats - xorb %ah, %ah # ah = 0 ==> ax = NoFats - mulw SectorsPerFat(%bp) # ax = NoFats * SectorsPerFat - addw ReservedSectors(%bp), %ax # ax = NoFats * SectorsPerFat + ReservedSectors = RootLBA - pushw %ds - popw %es - xorw %di, %di # Store directory in es:di = 1000:0000 - call ReadBlocks # Read entire Root Directory - addw %bx, %ax # ax = NoFats * SectorsPerFat + ReservedSectors + RootDirSectors = FirstClusterLBA (FirstDataSector) - movw %ax, (%bp) # Save FirstClusterLBA (FirstDataSector) for later use - - # dx - variable storage (initial value is 0) - # bx - loader (initial value is 0) - xorw %dx, %dx - xorw %bx, %bx - -FindEFILDR: - cmpl $LOADER_FILENAME_PART1, (%di) # Compare to "EFIL" - jne FindVARSTORE - cmpl $LOADER_FILENAME_PART2, 4(%di) - jne FindVARSTORE - cmpl $LOADER_FILENAME_PART3, 7(%di) - jne FindVARSTORE - movw 26(%di), %bx # bx = Start Cluster for EFILDR <---------------------------------- - testw %dx, %dx - je FindNext # Efivar.bin is not loaded - jmp FoundAll - -FindVARSTORE: - ## if the file is not loader file, see if it's "EFIVAR BIN" - cmpl $0x56494645, (%di) # Compare to "EFIV" - jne FindNext - cmpl $0x20205241, 4(%di) # Compare to "AR " - jne FindNext - cmpl $0x4e494220, 7(%di) # Compare to " BIN" - jne FindNext - movw %di, %dx # dx = Offset of Start Cluster for Efivar.bin <--------------------- - addw $26, %dx - testw %bx, %bx - je FindNext # Efildr is not loaded - jmp FoundAll - -FindNext: - # go to next find - addw $FAT_DIRECTORY_ENTRY_SIZE, %di # Increment di - subw $FAT_DIRECTORY_ENTRY_SIZE, %cx # Decrement cx - # TODO: jump to FindVarStore if ... - jne FindEFILDR - jmp NotFoundAll - -FoundAll: -FoundEFILDR: - movw %bx, %cx # cx = Start Cluster for EFILDR <---------------------------------- - movw %cs, %ax # Destination = 2000:0000 - addw $0x2000, %ax - movw %ax, %es - xorw %di, %di -ReadFirstClusterOfEFILDR: - movw %cx, %ax # ax = StartCluster - subw $2, %ax # ax = StartCluster - 2 - xorb %bh, %bh - movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster - pushw %dx - mulw %bx - popw %dx # ax = (StartCluster - 2) * SectorsPerCluster - addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster - xorb %bh, %bh - movb SectorsPerCluster(%bp), %bl # bx = Number of Sectors in a cluster - pushw %es - call ReadBlocks - popw %ax -JumpIntoFirstSectorOfEFILDR: - movw %ax, JumpSegment(%bp) -JumpFarInstruction: - .byte 0xea -JumpOffset: - .word 0x000 -JumpSegment: - .word 0x2000 - - -PrintString: - movw $0xb800, %ax - movw %ax, %es - movw $0x7c0, %ax - movw %ax, %ds - movw $7, %cx - movw $160, %di - rep - movsw - ret -# **************************************************************************** -# ReadBlocks - Reads a set of blocks from a block device -# -# AX = Start LBA -# BX = Number of Blocks to Read -# ES:DI = Buffer to store sectors read from disk -# **************************************************************************** - -# cx = Blocks -# bx = NumberOfBlocks -# si = StartLBA - -ReadBlocks: - pusha - addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA - addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA - movl %eax, %esi # esi = Start LBA - movw %bx, %cx # cx = Number of blocks to read -ReadCylinderLoop: - movw $0x7bfc, %bp # bp = 0x7bfc - movl %esi, %eax # eax = Start LBA - xorl %edx, %edx # edx = 0 - movzwl (%bp), %ebx # bx = MaxSector - divl %ebx # ax = StartLBA / MaxSector - incw %dx # dx = (StartLBA % MaxSector) + 1 - subw %dx, %bx # bx = MaxSector - Sector - incw %bx # bx = MaxSector - Sector + 1 - cmpw %bx, %cx # Compare (Blocks) to (MaxSector - Sector + 1) - jg LimitTransfer - movw %cx, %bx # bx = Blocks -LimitTransfer: - pushw %cx - movb %dl, %cl # cl = (StartLBA % MaxSector) + 1 = Sector - xorw %dx, %dx # dx = 0 - divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder - # dx = ax % (MaxHead + 1) = Head - - pushw %bx # Save number of blocks to transfer - movb %dl, %dh # dh = Head - movw $0x7c00, %bp # bp = 0x7c00 - movb PhysicalDrive(%bp), %dl # dl = Drive Number - movb %al, %ch # ch = Cylinder - movb %bl, %al # al = Blocks - movb $2, %ah # ah = Function 2 - movw %di, %bx # es:bx = Buffer address - int $0x13 - jc DiskError - popw %bx - popw %cx - movzwl %bx, %ebx - addl %ebx, %esi # StartLBA = StartLBA + NumberOfBlocks - subw %bx, %cx # Blocks = Blocks - NumberOfBlocks - movw %es, %ax - shlw $(BLOCK_SHIFT-4), %bx - addw %bx, %ax - movw %ax, %es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE - cmpw $0, %cx - jne ReadCylinderLoop - popa - ret - -# **************************************************************************** -# ERROR Condition: -# **************************************************************************** -NotFoundAll: - ## if we found EFILDR, continue - testw %bx, %bx - jne FoundEFILDR -BadBootSector: -DiskError: - movw $ErrorString, %si - call PrintString -Halt: - jmp Halt - -StartString: - .byte 'B', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c -ErrorString: - .byte 'B', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c - -# **************************************************************************** -# LBA Offset for BootSector, need patched by tool for HD boot. -# **************************************************************************** - - .org 0x01fa # Comment it for pass build. Should optimise code size. -LBAOffsetForBootSector: - .long 0x0 - -# **************************************************************************** -# Sector Signature -# **************************************************************************** - - .org 0x01fe # Comment it for pass build. -SectorSignature: - .word 0xaa55 # Boot Sector Signature - - -