]> git.proxmox.com Git - mirror_edk2.git/blame - DuetPkg/BootSector/Gpt.S
remove a segment of code, in which it forces EHCI to be connected firstly before...
[mirror_edk2.git] / DuetPkg / BootSector / Gpt.S
CommitLineData
32f9b796 1#------------------------------------------------------------------------------\r
2#*\r
3#* Copyright 2006 - 2007, Intel Corporation \r
4#* All rights reserved. This program and the accompanying materials \r
5#* are licensed and made available under the terms and conditions of the BSD License \r
6#* which accompanies this distribution. The full text of the license may be found at \r
7#* http://opensource.org/licenses/bsd-license.php \r
8#* \r
9#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
10#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
11#* \r
12#* gpt.asm\r
13#* \r
14#* Abstract:\r
15#*\r
16#------------------------------------------------------------------------------\r
17\r
18 #.MODEL small\r
19# .dosseg\r
20 .stack: \r
21 .486p: \r
22 .code: \r
23\r
24.equ BLOCK_SIZE, 0x0200\r
25.equ BLOCK_MASK, 0x01ff\r
26.equ BLOCK_SHIFT, 9\r
27\r
28# ****************************************************************************\r
29# Code loaded by BIOS at 0x0000:0x7C00\r
30# ****************************************************************************\r
31\r
32 .org 0x00\r
33Start: \r
34\r
35# ****************************************************************************\r
36# Start Print\r
37# ****************************************************************************\r
38\r
39 movw $0xb800, %ax\r
40 movw %ax, %es\r
41 movw $0x7c0, %ax\r
42 movw %ax, %ds\r
43 leaw %cs:StartString, %si\r
44 movw $10, %cx\r
45 movw $160, %di\r
46 rep\r
47 movsw\r
48\r
49# ****************************************************************************\r
50# Print over\r
51# ****************************************************************************\r
52\r
53# ****************************************************************************\r
54# Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600\r
55# ****************************************************************************\r
56 xorw %ax, %ax # AX = 0x0000 \r
57 movw $0x7c00, %bx # BX = 0x7C00\r
58 movw $0x600, %bp # BP = 0x0600\r
59 movw RelocatedStart, %si # SI = Offset(RelocatedStart)\r
60 movw $0x200, %cx # CX = 0x0200\r
61 subw %si, %cx # CS = 0x0200 - Offset(RelocatedStart)\r
62 leaw (%bp,%si,), %di # DI = 0x0600 + Offset(RelocatedStart)\r
63 leaw (%bx,%si,), %si # BX = 0x7C00 + Offset(RelocatedStart)\r
64 movw %ax, %ss # SS = 0x0000\r
65 movw %bx, %sp # SP = 0x7C00\r
66 movw %ax, %es # ES = 0x0000\r
67 movw %ax, %ds # DS = 0x0000\r
68 pushw %ax # PUSH 0x0000\r
69 pushw %di # PUSH 0x0600 + Offset(RelocatedStart)\r
70 cld # Clear the direction flag\r
71 rep\r
72 movsb # Copy 0x0200 bytes from 0x7C00 to 0x0600\r
73 retl # JMP 0x0000:0x0600 + Offset(RelocatedStart)\r
74\r
75# ****************************************************************************\r
76# Code relocated to 0x0000:0x0600\r
77# ****************************************************************************\r
78\r
79RelocatedStart: \r
80# ****************************************************************************\r
81# Get Driver Parameters to 0x0000:0x7BFC\r
82# ****************************************************************************\r
83 xorw %ax, %ax # ax = 0\r
84 movw %ax, %ss # ss = 0\r
85 addw $0x1000, %ax\r
86 movw %ax, %ds\r
87\r
88 movw $0x7c00, %sp # sp = 0x7c00\r
89 movw %sp, %bp # bp = 0x7c00\r
90\r
91 movb $8, %ah # ah = 8 - Get Drive Parameters Function\r
92 movb %dl, PhysicalDrive(%bp) # BBS defines that BIOS would pass the booting driver number to the loader through DL\r
93 int $0x13 # Get Drive Parameters\r
94 xorw %ax, %ax # ax = 0\r
95 movb %dh, %al # al = dh\r
96 incb %al # MaxHead = al + 1\r
97 pushw %ax # 0000:7bfe = MaxHead\r
98 movb %cl, %al # al = cl\r
99 andb $0x3f, %al # MaxSector = al & 0x3f\r
100 pushw %ax # 0000:7bfc = MaxSector\r
101\r
102# ****************************************************************************\r
103# Read GPT Header from hard disk to 0x0000:0x0800\r
104# ****************************************************************************\r
105 xorw %ax, %ax\r
106 movw %ax, %es # Read to 0x0000:0x0800\r
107 movw $0x800, %di # Read to 0x0000:0x0800\r
108 movl $1, %eax # Read LBA #1\r
109 movl $0, %edx # Read LBA #1\r
110 movw $1, %bx # Read 1 Block\r
111 pushw %es\r
112 call ReadBlocks\r
113 popw %es\r
114\r
115# ****************************************************************************\r
116# Read Target GPT Entry from hard disk to 0x0000:0x0A00\r
117# ****************************************************************************\r
118 cmpl $0x20494645, %es:(%di) # Check for "EFI "\r
119 jne BadGpt\r
120 cmpl $0x54524150, %es:4(%di) # Check for "PART"\r
121 jne BadGpt\r
122 cmpl $0x00010000, %es:8(%di) # Check Revision - 0x10000\r
123 jne BadGpt\r
124\r
125 movl %es:84(%di), %eax # EAX = SizeOfPartitionEntry\r
126 mulb GptPartitionIndicator(%bp) # EAX = SizeOfPartitionEntry * GptPartitionIndicator\r
127 movl %eax, %edx # EDX = SizeOfPartitionEntry * GptPartitionIndicator\r
128 shrl $BLOCK_SHIFT, %eax # EAX = (SizeOfPartitionEntry * GptPartitionIndicator) / BLOCK_SIZE\r
129 andl $BLOCK_MASK, %edx # EDX = Targer PartitionEntryLBA Offset\r
130 # = (SizeOfPartitionEntry * GptPartitionIndicator) % BLOCK_SIZE\r
131 pushl %edx\r
132 movl %es:72(%di), %ecx # ECX = PartitionEntryLBA (Low)\r
133 movl %es:76(%di), %ebx # EBX = PartitionEntryLBA (High)\r
134 addl %ecx, %eax # EAX = Target PartitionEntryLBA (Low)\r
135 # = (PartitionEntryLBA + \r
136 # (SizeOfPartitionEntry * GptPartitionIndicator) / BLOCK_SIZE)\r
137 adcl %ebx, %edx # EDX = Target PartitionEntryLBA (High)\r
138\r
139 movw $0xA00, %di # Read to 0x0000:0x0A00\r
140 movw $1, %bx # Read 1 Block\r
141 pushw %es\r
142 call ReadBlocks\r
143 popw %es\r
144\r
145# ****************************************************************************\r
146# Read Target DBR from hard disk to 0x0000:0x7C00\r
147# ****************************************************************************\r
148 popl %edx # EDX = (SizeOfPartitionEntry * GptPartitionIndicator) % BLOCK_SIZE\r
149 addw %dx, %di # DI = Targer PartitionEntryLBA Offset\r
150 cmpl $0xC12A7328, %es:(%di) # Check for EFI System Partition "C12A7328-F81F-11d2-BA4B-00A0C93EC93B"\r
151 jne BadGpt\r
152 cmpl $0x11d2F81F, %es:4(%di) # \r
153 jne BadGpt\r
154 cmpl $0xA0004BBA, %es:8(%di) # \r
155 jne BadGpt\r
156 cmpl $0x3BC93EC9, %es:0xc(%di) # \r
157 jne BadGpt\r
158\r
159 movl %es:32(%di), %eax # EAX = StartingLBA (Low)\r
160 movl %es:36(%di), %edx # EDX = StartingLBA (High)\r
161 movw $0x7C00, %di # Read to 0x0000:0x7C00\r
162 movw $1, %bx # Read 1 Block\r
163 call ReadBlocks\r
164\r
165# ****************************************************************************\r
166# Transfer control to BootSector - Jump to 0x0000:0x7C00\r
167# ****************************************************************************\r
168 xorw %ax, %ax\r
169 pushw %ax # PUSH 0x0000\r
170 movw $0x7c00, %di\r
171 pushw %di # PUSH 0x7C00\r
172 retl # JMP 0x0000:0x7C00\r
173\r
174# ****************************************************************************\r
175# ReadBlocks - Reads a set of blocks from a block device\r
176#\r
177# EDX:EAX = Start LBA\r
178# BX = Number of Blocks to Read (must < 127)\r
179# ES:DI = Buffer to store sectors read from disk\r
180# ****************************************************************************\r
181\r
182# si = DiskAddressPacket\r
183\r
184ReadBlocks: \r
185 pushal\r
186 pushw %ds\r
187 xorw %cx, %cx\r
188 movw %cx, %ds\r
189 movw $0x600, %bp # bp = 0x600\r
190 leaw AddressPacket(%bp), %si\r
191 movb %bl, %ds:2(%si) # 02 = Number Of Block transfered\r
192 movw %di, %ds:4(%si) # 04 = Transfer Buffer Offset\r
193 movw %es, %ds:6(%si) # 06 = Transfer Buffer Segment\r
194 movl %eax, %ds:8(%si) # 08 = Starting LBA (Low)\r
195 movl %edx, %ds:0xc(%si) # 0C = Starting LBA (High)\r
196 movb $0x42, %ah # ah = Function 42\r
197 movb PhysicalDrive(%bp), %dl # dl = Drive Number\r
198 int $0x13\r
199 jc BadGpt\r
200 popw %ds\r
201 popal\r
202 ret\r
203\r
204# ****************************************************************************\r
205# Address Packet used by ReadBlocks\r
206# ****************************************************************************\r
207AddressPacket: \r
208 .byte 0x10 # Size of address packet\r
209 .byte 0x0 # Reserved. Must be 0\r
210 .byte 0x1 # Read blocks at a time (To be fixed each times)\r
211 .byte 0x0 # Reserved. Must be 0\r
212 .word 0x000 # Destination Address offset (To be fixed each times)\r
213 .word 0x000 # Destination Address segment (To be fixed each times)\r
214AddressPacketLba: \r
215 .long 0x0,0x0 # Start LBA (To be fixed each times)\r
216AddressPacketEnd: \r
217\r
218# ****************************************************************************\r
219# ERROR Condition:\r
220# ****************************************************************************\r
221\r
222BadGpt: \r
223 movw $0xb800, %ax\r
224 movw %ax, %es\r
225 movw $0x60, %ax\r
226 movw %ax, %ds\r
227 leaw %cs:ErrorString, %si\r
228 movw $10, %cx\r
229 movw $320, %di\r
230 rep\r
231 movsw\r
232Halt: \r
233 jmp Halt\r
234\r
235StartString: \r
236 .byte 'G', 0x0c, 'P', 0x0c, 'T', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c\r
237ErrorString: \r
238 .byte 'G', 0x0c, 'P', 0x0c, 'T', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c\r
239\r
240# ****************************************************************************\r
241# PhysicalDrive - Used to indicate which disk to be boot\r
242# Can be patched by tool\r
243# ****************************************************************************\r
fd549a4d 244 # .org 0x01B6 # Just for passing build.\r
32f9b796 245PhysicalDrive: .byte 0x80\r
246\r
247# ****************************************************************************\r
248# GptPartitionIndicator - Used to indicate which GPT partition to be boot\r
249# Can be patched by tool\r
250# ****************************************************************************\r
fd549a4d 251 # .org 0x01B7 # Just for passing build.\r
32f9b796 252GptPartitionIndicator: .byte 0\r
253\r
254# ****************************************************************************\r
255# Unique MBR signature\r
256# ****************************************************************************\r
fd549a4d 257 # .org 0x01B8 # Just for passing build.\r
32f9b796 258 .ascii "DUET"\r
259\r
260# ****************************************************************************\r
261# Unknown\r
262# ****************************************************************************\r
fd549a4d 263 # .org 0x01BC # Just for passing build.\r
32f9b796 264 .word 0\r
265\r
266# ****************************************************************************\r
267# PMBR Entry - Can be patched by tool\r
268# ****************************************************************************\r
fd549a4d 269 # .org 0x01BE # Just for passing build.\r
32f9b796 270 .byte 0 # Boot Indicator\r
271 .byte 0xff # Start Header\r
272 .byte 0xff # Start Sector\r
273 .byte 0xff # Start Track\r
274 .byte 0xee # OS Type\r
275 .byte 0xff # End Header\r
276 .byte 0xff # End Sector\r
277 .byte 0xff # End Track\r
278 .long 1 # Starting LBA\r
279 .long 0xFFFFFFFF # End LBA\r
280\r
fd549a4d 281 # .org 0x01CE # Just for passing build.\r
32f9b796 282 .long 0,0,0,0\r
fd549a4d 283 # .org 0x01DE # Just for passing build.\r
32f9b796 284 .long 0,0,0,0\r
fd549a4d 285 # .org 0x01EE # Just for passing build.\r
32f9b796 286 .long 0,0,0,0\r
287\r
288# ****************************************************************************\r
289# Sector Signature\r
290# ****************************************************************************\r
291\r
fd549a4d 292 # .org 0x01FE # Just for passing build.\r
32f9b796 293SectorSignature: \r
294 .word 0xaa55 # Boot Sector Signature\r
295\r
296\r
297\r