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164 palkovsky 1
#
288 jermar 2
# Copyright (C) 2005 Ondrej Palkovsky
696 decky 3
# Copyright (C) 2006 Martin Decky
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# All rights reserved.
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#
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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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# are met:
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#
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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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# - 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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#   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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#   derived from this software without specific prior written permission.
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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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# 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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# 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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# 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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# 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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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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695 decky 30
#include <arch/boot/boot.h>
31
#include <arch/boot/memmap.h>
194 palkovsky 32
#include <arch/mm/page.h>	
188 palkovsky 33
#include <arch/mm/ptl.h>
194 palkovsky 34
#include <arch/pm.h>
251 palkovsky 35
#include <arch/cpu.h>
275 palkovsky 36
#include <arch/cpuid.h>
164 palkovsky 37
 
694 decky 38
#define START_STACK	(BOOT_OFFSET - BOOT_STACK_SIZE)
275 palkovsky 39
 
406 jermar 40
.section K_TEXT_START, "ax"
695 decky 41
 
680 decky 42
.code32
43
.align 4
695 decky 44
.global multiboot_image_start
680 decky 45
multiboot_header:
46
	.long MULTIBOOT_HEADER_MAGIC
47
	.long MULTIBOOT_HEADER_FLAGS
48
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
694 decky 49
	.long multiboot_header
50
	.long unmapped_ktext_start
680 decky 51
	.long 0
52
	.long 0
694 decky 53
	.long multiboot_image_start
188 palkovsky 54
 
680 decky 55
multiboot_image_start:
695 decky 56
	movl $START_STACK, %esp			# initialize stack pointer
57
	lgdt bootstrap_gdtr				# initialize Global Descriptor Table register
680 decky 58
 
685 decky 59
	movw $gdtselector(KDATA_DES), %cx
60
	movw %cx, %es
61
	movw %cx, %ds							# kernel data + stack
62
	movw %cx, %ss
807 palkovsky 63
	# Simics seems to remove hidden part of GS on entering user mode
64
	#  when _visible_ part of GS does not point to user-mode segment
65
	movw $gdtselector(UDATA_DES), %cx
66
	movw %cx, %fs
67
	movw %cx, %gs
685 decky 68
 
695 decky 69
	jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point
685 decky 70
	multiboot_meeting_point:
71
 
695 decky 72
	movl %eax, grub_eax							# save parameters from GRUB
73
	movl %ebx, grub_ebx
74
 
694 decky 75
	# Protected 32-bit. We want to reuse the code-seg descriptor,
76
	# the Default operand size must not be 1 when entering long mode
275 palkovsky 77
 
696 decky 78
	movl $0x80000000, %eax  
79
 	cpuid
80
 	cmp $0x80000000, %eax						# any function > 80000000h?
81
	jbe long_mode_unsupported
82
	movl $(AMD_CPUID_EXTENDED), %eax			# Extended function code 80000001
83
	cpuid
84
	bt $29, %edx								# Test if long mode is supported.
85
 	jc long_mode_supported
86
 
87
	long_mode_unsupported:
88
		cli
89
		hlt
90
 
91
	long_mode_supported:
92
 
188 palkovsky 93
	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
94
	# Paging is not enabled until after long mode is enabled
694 decky 95
 
188 palkovsky 96
	movl %cr4, %eax
97
	btsl $5, %eax
98
	movl %eax, %cr4
99
 
100
	# Set up paging tables
694 decky 101
 
188 palkovsky 102
	leal ptl_0, %eax
103
	movl %eax, %cr3
275 palkovsky 104
 
188 palkovsky 105
	# Enable long mode
178 palkovsky 106
 
694 decky 107
	movl $EFER_MSR_NUM, %ecx	# EFER MSR number
108
	rdmsr						# Read EFER
109
	btsl $AMD_LME_FLAG, %eax	# Set LME=1
110
	wrmsr						# Write EFER
111
 
188 palkovsky 112
	# Enable paging to activate long mode (set CR0.PG=1)
694 decky 113
 
188 palkovsky 114
	movl %cr0, %eax
115
	btsl $31, %eax
116
	movl %eax, %cr0
117
 
118
	# At this point we are in compatibility mode
694 decky 119
 
206 palkovsky 120
	jmpl $gdtselector(KTEXT_DES), $start64
164 palkovsky 121
 
188 palkovsky 122
.code64
123
start64:
275 palkovsky 124
	movq $(PA2KA(START_STACK)), %rsp
695 decky 125
	movl grub_eax, %eax
126
	movl grub_ebx, %ebx
127
 
128
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
129
	je valid_boot
130
 
131
		xorl %ecx, %ecx							# no memory size or map available
132
		movl %ecx, e801memorysize
133
		movl %ecx, e820counter
134
 
135
		jmp invalid_boot
136
 
137
	valid_boot:
138
 
139
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
140
 
141
		bt $0, %eax								# mbi->flags[0] (mem_lower, mem_upper valid)
142
		jc mem_valid
143
 
144
			xorl %ecx, %ecx
145
			jmp mem_invalid
146
 
147
		mem_valid:
148
		movl 4(%ebx), %ecx						# mbi->mem_lower
149
		addl 8(%ebx), %ecx						# mbi->mem_upper
150
 
151
		mem_invalid:
152
		movl %ecx, e801memorysize
153
 
1039 decky 154
		bt $3, %eax								# mbi->flags[3] (mods_count, mods_addr valid)
695 decky 155
		jc mods_valid
156
 
1052 decky 157
			xorq %rcx, %rcx
158
			movq %rcx, init
1039 decky 159
			jmp mods_end
695 decky 160
 
161
		mods_valid:
1039 decky 162
 
163
		xorq %rcx, %rcx
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		movl 20(%ebx), %ecx						# mbi->mods_count
1052 decky 165
		movq %rcx, init
1039 decky 166
 
695 decky 167
		cmpl $0, %ecx
1039 decky 168
		je mods_end
695 decky 169
 
170
		movl 24(%ebx), %esi						# mbi->mods_addr
1039 decky 171
		movq $init, %rdi
695 decky 172
 
1039 decky 173
		mods_loop:
174
 
175
			xorq %rdx, %rdx
176
			movl 0(%esi), %edx					# mods->mod_start
1063 palkovsky 177
			movq $0xffff800000000000, %r10
178
			addq %r10, %rdx
1052 decky 179
			movq %rdx, 8(%rdi)
1039 decky 180
 
181
			xorq %rdx, %rdx
182
			movl 4(%esi), %edx
183
			subl 0(%esi), %edx					# mods->mod_end - mods->mod_start
1052 decky 184
			movq %rdx, 16(%rdi)
1039 decky 185
 
186
			addl $16, %esi
187
			addq $16, %rdi
188
 
189
			loop mods_loop
190
 
191
		mods_end:
695 decky 192
 
193
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
194
		jc mmap_valid
195
 
196
			xorl %edx, %edx
197
			jmp mmap_invalid
198
 
199
		mmap_valid:
200
		movl 44(%ebx), %ecx						# mbi->mmap_length
201
		movl 48(%ebx), %esi						# mbi->mmap_addr
202
		movq $e820table, %rdi
203
		xorl %edx, %edx
204
 
205
		mmap_loop:
206
			cmpl $0, %ecx
207
			jle mmap_end
208
 
209
			movl 4(%esi), %eax					# mmap->base_addr_low
210
			movl %eax, (%rdi)
211
 
212
			movl 8(%esi), %eax					# mmap->base_addr_high
213
			movl %eax, 4(%rdi)
214
 
215
			movl 12(%esi), %eax					# mmap->length_low
216
			movl %eax, 8(%rdi)
217
 
218
			movl 16(%esi), %eax					# mmap->length_high
219
			movl %eax, 12(%rdi)
220
 
221
			movl 20(%esi), %eax					# mmap->type
222
			movl %eax, 16(%rdi)
223
 
224
			movl (%esi), %eax					# mmap->size
225
			addl $0x4, %eax
226
			addl %eax, %esi
227
			subl %eax, %ecx
228
			addq $MEMMAP_E820_RECORD_SIZE, %rdi
229
			incl %edx
230
			jmp mmap_loop
231
 
232
		mmap_end:
233
 
234
		mmap_invalid:
235
		movl %edx, e820counter
236
 
237
	invalid_boot:
238
 
696 decky 239
#ifdef CONFIG_SMP
240
 
241
	# copy AP bootstrap routines below 1 MB
242
 
243
	movq $BOOT_OFFSET, %rsi
244
	movq $AP_BOOT_OFFSET, %rdi
245
	movq $_hardcoded_unmapped_size, %rcx
246
	cld
247
	rep movsb
248
 
249
#endif
250
 
694 decky 251
	call main_bsp   # never returns
178 palkovsky 252
 
694 decky 253
	cli
254
	hlt
206 palkovsky 255
 
406 jermar 256
.section K_DATA_START, "aw", @progbits
164 palkovsky 257
.align 4096
206 palkovsky 258
 
417 palkovsky 259
# Identical mapping of first 64MB and the same of -2GB -> 0	
188 palkovsky 260
.global ptl_2
261
ptl_2:	
262
	.quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
263
	.quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
264
	.quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
265
	.quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
266
	.quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
267
	.quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
268
	.quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
269
	.quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
417 palkovsky 270
	.quad 0x1000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
271
	.quad 0x1200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
272
	.quad 0x1400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
273
	.quad 0x1600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
274
	.quad 0x1800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
275
	.quad 0x1a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
276
	.quad 0x1c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
277
	.quad 0x1e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
278
	.quad 0x2000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
279
	.quad 0x2200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
280
	.quad 0x2400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
281
	.quad 0x2600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
282
	.quad 0x2800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
283
	.quad 0x2a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
284
	.quad 0x2c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
285
	.quad 0x2e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
286
	.quad 0x3000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
287
	.quad 0x3200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
288
	.quad 0x3400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
289
	.quad 0x3600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
290
	.quad 0x3800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
291
	.quad 0x3a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
292
	.quad 0x3c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
293
	.quad 0x3e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
188 palkovsky 294
 
295
.align 4096
296
.global ptl_1
297
ptl_1:
298
	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
299
	.fill 509,8,0
300
	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
293 palkovsky 301
	.fill 1,8,0
188 palkovsky 302
 
303
.align 4096
304
.global ptl_0
305
ptl_0:
306
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 307
	.fill 255,8,0
188 palkovsky 308
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 309
	.fill 254,8,0
310
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 311
 
695 decky 312
.global bootstrap_gdtr
313
bootstrap_gdtr:
685 decky 314
	.word gdtselector(GDT_ITEMS)
315
	.long KA2PA(gdt)
695 decky 316
 
317
grub_eax:
318
	.long 0
319
 
320
grub_ebx:
321
	.long 0