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#
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#
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# Copyright (C) 2001-2004 Jakub Jermar
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# Copyright (C) 2001-2004 Jakub Jermar
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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#
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#
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# - Redistributions of source code must retain the above copyright
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#   derived from this software without specific prior written permission.
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#
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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29 
#include <arch/boot/boot.h>
 29 
#include <arch/boot/boot.h>
- 
 
 30 
#include <arch/boot/memmapasm.h>
30 
 
 31 
 
31 
.section K_TEXT_START
 32 
.section K_TEXT_START
32 
.global kernel_image_start
 33 
.global kernel_image_start
33 
 
 34 
 
34 
KTEXT=8
 35 
KTEXT=8
35 
KDATA=16
 36 
KDATA=16
36 
 
 37 
 
37 
.code16
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.code16
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#
 39 
#
39 
# This is where we require any SPARTAN-kernel-compatible boot loader
 40 
# This is where we require any SPARTAN-kernel-compatible boot loader
40 
# to pass control in real mode.
 41 
# to pass control in real mode.
41 
#
 42 
#
42 
# Protected mode tables are statically initialised during compile
 43 
# Protected mode tables are statically initialised during compile
43 
# time. So we can just load the respective table registers and
 44 
# time. So we can just load the respective table registers and
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# switch to protected mode.
 45 
# switch to protected mode.
45 
#
 46 
#
46 
kernel_image_start:
 47 
kernel_image_start:
47 
	cli
 48 
	cli
48 
	xorw %ax, %ax
 49 
	xorw %ax, %ax
49 
	movw %ax, %ds
 50 
	movw %ax, %ds
50 
	movw %ax, %ss							# initialize stack segment register
 51 
	movw %ax, %ss							# initialize stack segment register
51 
	movl $BOOTSTRAP_OFFSET - 0x400, %esp	# initialize stack pointer
 52 
	movl $BOOTSTRAP_OFFSET - 0x400, %esp	# initialize stack pointer
52
53
53 
	call memmap_arch_init
 54 
	call memmap_arch_init
54
55
55 
	lgdt real_bootstrap_gdtr				# initialize Global Descriptor Table register
 56 
	lgdt real_bootstrap_gdtr				# initialize Global Descriptor Table register
56
57
57 
	movl %cr0, %eax
 58 
	movl %cr0, %eax
58 
	orl $0x1, %eax
 59 
	orl $0x1, %eax
59 
	movl %eax, %cr0							# switch to protected mode
 60 
	movl %eax, %cr0							# switch to protected mode
60
61
61 
	jmpl $KTEXT, $boot_image_start
 62 
	jmpl $KTEXT, $boot_image_start
62
63
63 
.code32
 64 
.code32
64 
.align 4
 65 
.align 4
65 
multiboot_header:
 66 
multiboot_header:
66 
	.long MULTIBOOT_HEADER_MAGIC
 67 
	.long MULTIBOOT_HEADER_MAGIC
67 
	.long MULTIBOOT_HEADER_FLAGS
 68 
	.long MULTIBOOT_HEADER_FLAGS
68 
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
 69 
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
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	.long multiboot_header + BOOT_OFFSET
 70 
	.long multiboot_header + BOOT_OFFSET
70 
	.long unmapped_ktext_start + BOOT_OFFSET
 71 
	.long unmapped_ktext_start + BOOT_OFFSET
71 
	.long 0
 72 
	.long 0
72 
	.long 0
 73 
	.long 0
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	.long multiboot_image_start + BOOT_OFFSET
 74 
	.long multiboot_image_start + BOOT_OFFSET
74
75
75 
boot_image_start:
 76 
boot_image_start:
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	movw $KDATA, %ax
 77 
	movw $KDATA, %ax
77 
	movw %ax, %es
 78 
	movw %ax, %es
78 
	movw %ax, %gs
 79 
	movw %ax, %gs
79 
	movw %ax, %fs
 80 
	movw %ax, %fs
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	movw %ax, %ds			# kernel data + stack
 81 
	movw %ax, %ds			# kernel data + stack
81 
	movw %ax, %ss
 82 
	movw %ax, %ss
82
83
83 
	call map_kernel			# map kernel and turn paging on
 - 
 
84
- 
 
85 
	movb $0xd1, %al			# enable A20 using the keyboard controller
 84 
	movb $0xd1, %al			# enable A20 using the keyboard controller
86 
	outb %al, $0x64
 85 
	outb %al, $0x64
87 
	movb $0xdf, %al
 86 
	movb $0xdf, %al
88 
	outb %al, $0x60
 87 
	outb %al, $0x60
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88
90 
	movl $BOOTSTRAP_OFFSET, %esi
 89 
	movl $BOOTSTRAP_OFFSET, %esi
91 
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
 90 
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
92 
	movl $_hardcoded_kernel_size, %ecx
 91 
	movl $_hardcoded_kernel_size, %ecx
93 
	cld
 92 
	cld
94 
	rep movsb
 93 
	rep movsb
95
94
- 
 
 95 
	call map_kernel			# map kernel and turn paging on
- 
 
 96
96 
	call main_bsp			# never returns
 97 
	call main_bsp			# never returns
97 
 
 98 
 
98 
	cli
 99 
	cli
99 
	hlt
 100 
	hlt
100
101
101 
multiboot_image_start:
 102 
multiboot_image_start:
102 
	movl $BOOTSTRAP_OFFSET - 0x400, %esp			# initialize stack pointer
 103 
	movl $BOOTSTRAP_OFFSET - 0x400, %esp			# initialize stack pointer
103
104
104 
	lgdt protected_bootstrap_gdtr - 0x80000000		# initialize Global Descriptor Table register
 105 
	lgdt protected_bootstrap_gdtr - 0x80000000		# initialize Global Descriptor Table register
105 
 
 106 
 
106 
	movw $KDATA, %cx
 107 
	movw $KDATA, %cx
107 
	movw %cx, %es
 108 
	movw %cx, %es
108 
	movw %cx, %gs
 109 
	movw %cx, %gs
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	movw %cx, %fs
 110 
	movw %cx, %fs
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	movw %cx, %ds									# kernel data + stack
 111 
	movw %cx, %ds									# kernel data + stack
111 
	movw %cx, %ss
 112 
	movw %cx, %ss
112
113
113 
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
 114 
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
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	multiboot_meeting_point:
 115 
	multiboot_meeting_point:
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116
116 
	pushl %ebx
 117 
	pushl %ebx										# save parameters from GRUB
117 
	pushl %eax
 118 
	pushl %eax
118
119
- 
 
 120 
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
- 
 
 121 
	movl $BOOTSTRAP_OFFSET, %edi
- 
 
 122 
	movl $_hardcoded_unmapped_size, %ecx
- 
 
 123 
	cld
- 
 
 124 
	rep movsb
- 
 
 125
119 
	call map_kernel									# map kernel and turn paging on
 126 
	call map_kernel									# map kernel and turn paging on
120
127
121 
	popl %eax
 128 
	popl %eax
122 
	popl %ebx
 129 
	popl %ebx
123 
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax
 130 
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax			# compare GRUB signature
124 
	je valid_boot
 131 
	je valid_boot
125
132
- 
 
 133 
		xorl %ecx, %ecx							# no memory size or map available
- 
 
 134 
		movl %ecx, e801memorysize
126 
		# ...
 135 
		movl %ecx, e820counter
127
136
128 
		jmp invalid_boot
 137 
		jmp invalid_boot
129
138
130 
	valid_boot:
 139 
	valid_boot:
131
140
132 
		movl (%ebx), %eax
 141 
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
133
142
- 
 
 143 
		bt $0, %eax								# mbi->flags[0] (mem_lower, mem_upper valid)
- 
 
 144 
		jc mem_valid
- 
 
 145
134 
		# ... check flags in eax
 146 
			xorl %ecx, %ecx
- 
 
 147 
			jmp mem_invalid
- 
 
 148
- 
 
 149 
		mem_valid:
- 
 
 150 
		movl 4(%ebx), %ecx						# mbi->mem_lower
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 151 
		addl 8(%ebx), %ecx						# mbi->mem_upper
135
152
136 
		movl 4(%ebx), %ecx
 153 
		mem_invalid:
137 
		addl 8(%ebx), %ecx
 - 
 
138 
		movl %ecx, e801memorysize
 154 
		movl %ecx, e801memorysize
139
155
- 
 
 156 
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)
- 
 
 157 
		jc mmap_valid
- 
 
 158
140 
#		movl 44(%ebx), %ecx
 159 
			xorl %edx, %edx
- 
 
 160 
			jmp mmap_invalid
- 
 
 161
- 
 
 162 
		mmap_valid:
- 
 
 163 
		movl 44(%ebx), %ecx						# mbi->mmap_length
- 
 
 164 
		movl 48(%ebx), %esi						# mbi->mmap_addr
- 
 
 165 
		movl $e820table, %edi
141 
		xorl %ecx, %ecx
 166 
		xorl %edx, %edx
- 
 
 167
- 
 
 168 
		mmap_loop:
- 
 
 169 
			cmpl $0, %ecx
- 
 
 170 
			jle mmap_end
- 
 
 171
- 
 
 172 
			movl 4(%esi), %eax					# mmap->base_addr_low
142 
		movl %ecx, e820counter
 173 
			movl %eax, (%edi)
- 
 
 174
- 
 
 175 
			movl 8(%esi), %eax					# mmap->base_addr_high
143 
#		movl 48(%ebx), %esi
 176 
			movl %eax, 4(%edi)
- 
 
 177
- 
 
 178 
			movl 12(%esi), %eax					# mmap->length_low
144 
#		movl $e820table, %edi
 179 
			movl %eax, 8(%edi)
- 
 
 180
- 
 
 181 
			movl 16(%esi), %eax					# mmap->length_high
- 
 
 182 
			movl %eax, 12(%edi)
- 
 
 183
- 
 
 184 
			movl 20(%esi), %eax					# mmap->type
- 
 
 185 
			movl %eax, 16(%edi)
145 
#		cld
 186
- 
 
 187 
			movl (%esi), %eax					# mmap->size
- 
 
 188 
			addl $0x4, %eax
- 
 
 189 
			addl %eax, %esi
- 
 
 190 
			subl %eax, %ecx
- 
 
 191 
			addl $MEMMAP_E820_RECORD_SIZE, %edi
- 
 
 192 
			incl %edx
146 
#		rep movsb
 193 
			jmp mmap_loop
- 
 
 194
- 
 
 195 
		mmap_end:
- 
 
 196
- 
 
 197 
		mmap_invalid:
- 
 
 198 
		movl %edx, e820counter
147
199
148 
	invalid_boot:
 200 
	invalid_boot:
149
201
150 
	call main_bsp - BOOT_OFFSET						# never returns
 202 
	call main_bsp - BOOT_OFFSET						# never returns
151 
 
 203 
 
152 
	cli
 204 
	cli
153 
	hlt
 205 
	hlt
154 
 
 206 
 
155 
.global map_kernel
 207 
.global map_kernel
156 
map_kernel:
 208 
map_kernel:
157 
	#
 209 
	#
158 
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
 210 
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
159 
	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
 211 
	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
160 
	#
 212 
	#
161 
	movl %cr4, %ecx
 213 
	movl %cr4, %ecx
162 
	orl $(1<<4), %ecx
 214 
	orl $(1<<4), %ecx
163 
	movl %ecx, %cr4				# turn PSE on
 215 
	movl %ecx, %cr4				# turn PSE on
164
216
165 
	movl $((1<<7)|(1<<0)), %eax
 217 
	movl $((1<<7)|(1<<0)), %eax
166 
	movl %eax, page_directory		# mapping 0x00000000 => 0x00000000
 218 
	movl %eax, page_directory		# mapping 0x00000000 => 0x00000000
167 
 
 219 
 
168 
	movl $(page_directory+(4096/2)), %edx
 220 
	movl $(page_directory+(4096/2)), %edx
169 
	movl %eax, (%edx)			# mapping 0x80000000 => 0x00000000
 221 
	movl %eax, (%edx)			# mapping 0x80000000 => 0x00000000
170 
 
 222 
 
171 
	leal page_directory, %eax
 223 
	leal page_directory, %eax
172 
	movl %eax, %cr3
 224 
	movl %eax, %cr3
173
225
174 
	# turn paging on
 226 
	# turn paging on
175 
	movl %cr0, %ebx
 227 
	movl %cr0, %ebx
176 
	orl $(1<<31), %ebx
 228 
	orl $(1<<31), %ebx
177 
	movl %ebx, %cr0
 229 
	movl %ebx, %cr0
178 
	ret
 230 
	ret
179 
 
 231 
 
180 
 
 232 
 
181 
.section K_DATA_START
 233 
.section K_DATA_START
182 
 
 234 
 
183 
.align 4096
 235 
.align 4096
184 
page_directory:
 236 
page_directory:
185 
	.space 4096, 0
 237 
	.space 4096, 0
186 
 
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