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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
 
157
			xorl %ecx, %ecx
1039 decky 158
			movl %ecx, init
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
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		movl %ecx, init
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
177
			addq $0xffffffff80000000, %rdx
178
			movq %rdx, 4(%rdi)
179
 
180
			xorq %rdx, %rdx
181
			movl 4(%esi), %edx
182
			subl 0(%esi), %edx					# mods->mod_end - mods->mod_start
183
			movq %rdx, 12(%rdi)
184
 
185
			addl $16, %esi
186
			addq $16, %rdi
187
 
188
			loop mods_loop
189
 
190
		mods_end:
695 decky 191
 
192
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
193
		jc mmap_valid
194
 
195
			xorl %edx, %edx
196
			jmp mmap_invalid
197
 
198
		mmap_valid:
199
		movl 44(%ebx), %ecx						# mbi->mmap_length
200
		movl 48(%ebx), %esi						# mbi->mmap_addr
201
		movq $e820table, %rdi
202
		xorl %edx, %edx
203
 
204
		mmap_loop:
205
			cmpl $0, %ecx
206
			jle mmap_end
207
 
208
			movl 4(%esi), %eax					# mmap->base_addr_low
209
			movl %eax, (%rdi)
210
 
211
			movl 8(%esi), %eax					# mmap->base_addr_high
212
			movl %eax, 4(%rdi)
213
 
214
			movl 12(%esi), %eax					# mmap->length_low
215
			movl %eax, 8(%rdi)
216
 
217
			movl 16(%esi), %eax					# mmap->length_high
218
			movl %eax, 12(%rdi)
219
 
220
			movl 20(%esi), %eax					# mmap->type
221
			movl %eax, 16(%rdi)
222
 
223
			movl (%esi), %eax					# mmap->size
224
			addl $0x4, %eax
225
			addl %eax, %esi
226
			subl %eax, %ecx
227
			addq $MEMMAP_E820_RECORD_SIZE, %rdi
228
			incl %edx
229
			jmp mmap_loop
230
 
231
		mmap_end:
232
 
233
		mmap_invalid:
234
		movl %edx, e820counter
235
 
236
	invalid_boot:
237
 
696 decky 238
#ifdef CONFIG_SMP
239
 
240
	# copy AP bootstrap routines below 1 MB
241
 
242
	movq $BOOT_OFFSET, %rsi
243
	movq $AP_BOOT_OFFSET, %rdi
244
	movq $_hardcoded_unmapped_size, %rcx
245
	cld
246
	rep movsb
247
 
248
#endif
249
 
694 decky 250
	call main_bsp   # never returns
178 palkovsky 251
 
694 decky 252
	cli
253
	hlt
206 palkovsky 254
 
406 jermar 255
.section K_DATA_START, "aw", @progbits
164 palkovsky 256
.align 4096
206 palkovsky 257
 
417 palkovsky 258
# Identical mapping of first 64MB and the same of -2GB -> 0	
188 palkovsky 259
.global ptl_2
260
ptl_2:	
261
	.quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
262
	.quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
263
	.quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
264
	.quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
265
	.quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
266
	.quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
267
	.quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
268
	.quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
417 palkovsky 269
	.quad 0x1000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
270
	.quad 0x1200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
271
	.quad 0x1400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
272
	.quad 0x1600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
273
	.quad 0x1800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
274
	.quad 0x1a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
275
	.quad 0x1c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
276
	.quad 0x1e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
277
	.quad 0x2000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
278
	.quad 0x2200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
279
	.quad 0x2400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
280
	.quad 0x2600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
281
	.quad 0x2800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
282
	.quad 0x2a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
283
	.quad 0x2c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
284
	.quad 0x2e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
285
	.quad 0x3000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
286
	.quad 0x3200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
287
	.quad 0x3400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
288
	.quad 0x3600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
289
	.quad 0x3800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
290
	.quad 0x3a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
291
	.quad 0x3c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
292
	.quad 0x3e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
188 palkovsky 293
 
294
.align 4096
295
.global ptl_1
296
ptl_1:
297
	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
298
	.fill 509,8,0
299
	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
293 palkovsky 300
	.fill 1,8,0
188 palkovsky 301
 
302
.align 4096
303
.global ptl_0
304
ptl_0:
305
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
306
	.fill 510,8,0
307
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 308
 
695 decky 309
.global bootstrap_gdtr
310
bootstrap_gdtr:
685 decky 311
	.word gdtselector(GDT_ITEMS)
312
	.long KA2PA(gdt)
695 decky 313
 
314
grub_eax:
315
	.long 0
316
 
317
grub_ebx:
318
	.long 0