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2692 decky 1
 
2071 jermar 2
# Copyright (c) 2005 Ondrej Palkovsky
3
# Copyright (c) 2006 Martin Decky
2703 jermar 4
# Copyright (c) 2008 Jakub Jermar
164 palkovsky 5
# All rights reserved.
6
#
7
# Redistribution and use in source and binary forms, with or without
8
# modification, are permitted provided that the following conditions
9
# are met:
10
#
11
# - Redistributions of source code must retain the above copyright
12
#   notice, this list of conditions and the following disclaimer.
13
# - Redistributions in binary form must reproduce the above copyright
14
#   notice, this list of conditions and the following disclaimer in the
15
#   documentation and/or other materials provided with the distribution.
16
# - The name of the author may not be used to endorse or promote products
17
#   derived from this software without specific prior written permission.
18
#
19
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
#
30
 
695 decky 31
#include <arch/boot/boot.h>
32
#include <arch/boot/memmap.h>
194 palkovsky 33
#include <arch/mm/page.h>	
188 palkovsky 34
#include <arch/mm/ptl.h>
194 palkovsky 35
#include <arch/pm.h>
251 palkovsky 36
#include <arch/cpu.h>
275 palkovsky 37
#include <arch/cpuid.h>
164 palkovsky 38
 
694 decky 39
#define START_STACK	(BOOT_OFFSET - BOOT_STACK_SIZE)
275 palkovsky 40
 
406 jermar 41
.section K_TEXT_START, "ax"
695 decky 42
 
680 decky 43
.code32
44
.align 4
695 decky 45
.global multiboot_image_start
680 decky 46
multiboot_header:
47
	.long MULTIBOOT_HEADER_MAGIC
48
	.long MULTIBOOT_HEADER_FLAGS
49
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
694 decky 50
	.long multiboot_header
51
	.long unmapped_ktext_start
680 decky 52
	.long 0
53
	.long 0
694 decky 54
	.long multiboot_image_start
188 palkovsky 55
 
680 decky 56
multiboot_image_start:
695 decky 57
	movl $START_STACK, %esp			# initialize stack pointer
2703 jermar 58
	lgdtl bootstrap_gdtr			# initialize Global Descriptor Table register
680 decky 59
 
685 decky 60
	movw $gdtselector(KDATA_DES), %cx
61
	movw %cx, %es
62
	movw %cx, %ds							# kernel data + stack
63
	movw %cx, %ss
807 palkovsky 64
	# Simics seems to remove hidden part of GS on entering user mode
65
	#  when _visible_ part of GS does not point to user-mode segment
66
	movw $gdtselector(UDATA_DES), %cx
67
	movw %cx, %fs
68
	movw %cx, %gs
685 decky 69
 
695 decky 70
	jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point
685 decky 71
	multiboot_meeting_point:
72
 
2703 jermar 73
	movl %eax, grub_eax						# save parameters from GRUB
695 decky 74
	movl %ebx, grub_ebx
75
 
2219 decky 76
	# Protected 32-bit. We want to reuse the code-seg descriptor,
77
	# the Default operand size must not be 1 when entering long mode
78
 
2692 decky 79
	movl $(INTEL_CPUID_EXTENDED), %eax  
2219 decky 80
 	cpuid
2692 decky 81
 	cmp $(INTEL_CPUID_EXTENDED), %eax
82
	ja extended_cpuid_supported
83
 
84
		movl $extended_cpuid_msg, %esi
85
		jmp error_halt
86
 
87
	extended_cpuid_supported:
88
 
89
	movl $(AMD_CPUID_EXTENDED), %eax
2219 decky 90
	cpuid
2692 decky 91
	bt $(AMD_EXT_LONG_MODE), %edx
2219 decky 92
 	jc long_mode_supported
2692 decky 93
 
2219 decky 94
		movl $long_mode_msg, %esi
95
		jmp error_halt
2692 decky 96
 
2219 decky 97
	long_mode_supported:
98
 
2692 decky 99
	bt $(AMD_EXT_NOEXECUTE), %edx
100
	jc noexecute_supported
101
 
102
		movl $noexecute_msg, %esi
103
		jmp error_halt
104
 
105
	noexecute_supported:
106
 
107
	movl $(INTEL_CPUID_STANDARD), %eax
108
	cpuid
109
	bt $(INTEL_FXSAVE), %edx
110
 	jc fx_supported
111
 
112
		movl $fx_msg, %esi
113
		jmp error_halt
114
 
115
	fx_supported:
116
 
117
	bt $(INTEL_SSE2), %edx
118
 	jc sse2_supported
119
 
120
		movl $sse2_msg, %esi
121
		jmp error_halt
122
 
123
	sse2_supported:
124
 
1289 vana 125
#ifdef CONFIG_FB
2219 decky 126
	mov $vesa_init, %esi
1641 decky 127
	mov $VESA_INIT_SEGMENT << 4, %edi
128
	mov $e_vesa_init - vesa_init, %ecx
129
	cld
130
	rep movsb
1289 vana 131
 
1641 decky 132
	mov $VESA_INIT_SEGMENT << 4, %edi
133
	jmpl *%edi
134
 
135
	vesa_meeting_point:
136
 
137
	mov %esi, KA2PA(vesa_ph_addr)
138
	mov %di, KA2PA(vesa_height)
139
	shr $16, %edi
140
	mov %di, KA2PA(vesa_width)
141
	mov %bx, KA2PA(vesa_scanline)
142
	shr $16, %ebx
143
	mov %bx, KA2PA(vesa_bpp)
1289 vana 144
#endif	
275 palkovsky 145
 
2692 decky 146
	# Enable 64-bit page translation entries - CR4.PAE = 1.
188 palkovsky 147
	# Paging is not enabled until after long mode is enabled
694 decky 148
 
188 palkovsky 149
	movl %cr4, %eax
150
	btsl $5, %eax
151
	movl %eax, %cr4
152
 
153
	# Set up paging tables
694 decky 154
 
188 palkovsky 155
	leal ptl_0, %eax
156
	movl %eax, %cr3
275 palkovsky 157
 
188 palkovsky 158
	# Enable long mode
178 palkovsky 159
 
2703 jermar 160
	movl $EFER_MSR_NUM, %ecx			# EFER MSR number
694 decky 161
	rdmsr						# Read EFER
2703 jermar 162
	btsl $AMD_LME_FLAG, %eax			# Set LME = 1
694 decky 163
	wrmsr						# Write EFER
164
 
2692 decky 165
	# Enable paging to activate long mode (set CR0.PG = 1)
694 decky 166
 
188 palkovsky 167
	movl %cr0, %eax
168
	btsl $31, %eax
169
	movl %eax, %cr0
170
 
171
	# At this point we are in compatibility mode
694 decky 172
 
206 palkovsky 173
	jmpl $gdtselector(KTEXT_DES), $start64
164 palkovsky 174
 
188 palkovsky 175
.code64
176
start64:
275 palkovsky 177
	movq $(PA2KA(START_STACK)), %rsp
695 decky 178
	movl grub_eax, %eax
179
	movl grub_ebx, %ebx
180
 
2703 jermar 181
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax			# compare GRUB signature
695 decky 182
	je valid_boot
183
 
2703 jermar 184
		xorl %ecx, %ecx					# no memory size or map available
695 decky 185
		movl %ecx, e820counter
186
 
187
		jmp invalid_boot
188
 
189
	valid_boot:
190
 
2703 jermar 191
		movl (%ebx), %eax				# ebx = physical address of struct multiboot_info
695 decky 192
 
2703 jermar 193
		bt $3, %eax					# mbi->flags[3] (mods_count, mods_addr valid)
695 decky 194
		jc mods_valid
195
 
1052 decky 196
			xorq %rcx, %rcx
197
			movq %rcx, init
1039 decky 198
			jmp mods_end
695 decky 199
 
200
		mods_valid:
1039 decky 201
 
202
		xorq %rcx, %rcx
2703 jermar 203
		movl 20(%ebx), %ecx				# mbi->mods_count
1052 decky 204
		movq %rcx, init
1039 decky 205
 
695 decky 206
		cmpl $0, %ecx
1039 decky 207
		je mods_end
695 decky 208
 
2703 jermar 209
		movl 24(%ebx), %esi				# mbi->mods_addr
1039 decky 210
		movq $init, %rdi
695 decky 211
 
1039 decky 212
		mods_loop:
213
 
214
			xorq %rdx, %rdx
2703 jermar 215
			movl 0(%esi), %edx			# mods->mod_start
1063 palkovsky 216
			movq $0xffff800000000000, %r10
217
			addq %r10, %rdx
1052 decky 218
			movq %rdx, 8(%rdi)
1039 decky 219
 
220
			xorq %rdx, %rdx
221
			movl 4(%esi), %edx
2703 jermar 222
			subl 0(%esi), %edx			# mods->mod_end - mods->mod_start
1052 decky 223
			movq %rdx, 16(%rdi)
1039 decky 224
 
225
			addl $16, %esi
226
			addq $16, %rdi
227
 
228
			loop mods_loop
229
 
230
		mods_end:
695 decky 231
 
2703 jermar 232
		bt $6, %eax					# mbi->flags[6] (mmap_length, mmap_addr valid)	
695 decky 233
		jc mmap_valid
234
 
235
			xorl %edx, %edx
236
			jmp mmap_invalid
237
 
238
		mmap_valid:
2703 jermar 239
		movl 44(%ebx), %ecx				# mbi->mmap_length
240
		movl 48(%ebx), %esi				# mbi->mmap_addr
695 decky 241
		movq $e820table, %rdi
242
		xorl %edx, %edx
243
 
244
		mmap_loop:
245
			cmpl $0, %ecx
246
			jle mmap_end
247
 
2703 jermar 248
			movl 4(%esi), %eax			# mmap->base_addr_low
695 decky 249
			movl %eax, (%rdi)
250
 
2703 jermar 251
			movl 8(%esi), %eax			# mmap->base_addr_high
695 decky 252
			movl %eax, 4(%rdi)
253
 
2703 jermar 254
			movl 12(%esi), %eax			# mmap->length_low
695 decky 255
			movl %eax, 8(%rdi)
256
 
2703 jermar 257
			movl 16(%esi), %eax			# mmap->length_high
695 decky 258
			movl %eax, 12(%rdi)
259
 
2703 jermar 260
			movl 20(%esi), %eax			# mmap->type
695 decky 261
			movl %eax, 16(%rdi)
262
 
2703 jermar 263
			movl (%esi), %eax			# mmap->size
695 decky 264
			addl $0x4, %eax
265
			addl %eax, %esi
266
			subl %eax, %ecx
267
			addq $MEMMAP_E820_RECORD_SIZE, %rdi
268
			incl %edx
269
			jmp mmap_loop
270
 
271
		mmap_end:
272
 
273
		mmap_invalid:
274
		movl %edx, e820counter
275
 
276
	invalid_boot:
277
 
696 decky 278
#ifdef CONFIG_SMP
279
 
280
	# copy AP bootstrap routines below 1 MB
281
 
282
	movq $BOOT_OFFSET, %rsi
283
	movq $AP_BOOT_OFFSET, %rdi
284
	movq $_hardcoded_unmapped_size, %rcx
285
	cld
286
	rep movsb
287
 
288
#endif
289
 
694 decky 290
	call main_bsp   # never returns
178 palkovsky 291
 
694 decky 292
	cli
293
	hlt
1289 vana 294
 
295
#ifdef CONFIG_FB
296
.code32
297
vesa_init:
1641 decky 298
	jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
299
 
1289 vana 300
.code16
1641 decky 301
vesa_init_real:
1289 vana 302
 
1641 decky 303
	mov %cr0, %eax
304
	and $~1, %eax
305
	mov %eax, %cr0
306
 
307
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
308
 
309
vesa_init_real2:
310
 
311
	mov $VESA_INIT_SEGMENT, %bx
312
 
313
	mov %bx, %es
314
	mov %bx, %fs
315
	mov %bx, %gs
316
	mov %bx, %ds
317
	mov %bx, %ss
318
 
319
	movl $0x0000fffc, %esp
2713 decky 320
	movl $0x0000fffc, %ebp
1641 decky 321
 
1289 vana 322
#define VESA_INFO_SIZE 1024
323
 
2302 decky 324
#define VESA_MODE_ATTRIBUTES_OFFSET 0
1641 decky 325
#define VESA_MODE_LIST_PTR_OFFSET 14
2302 decky 326
#define VESA_MODE_SCANLINE_OFFSET 16
1289 vana 327
#define VESA_MODE_WIDTH_OFFSET 18
328
#define VESA_MODE_HEIGHT_OFFSET 20
329
#define VESA_MODE_BPP_OFFSET 25
330
#define VESA_MODE_PHADDR_OFFSET 40
331
 
1641 decky 332
#define VESA_END_OF_MODES 0xffff
1289 vana 333
 
1641 decky 334
#define VESA_OK 0x4f
1289 vana 335
 
1641 decky 336
#define VESA_GET_INFO 0x4f00
1289 vana 337
#define VESA_GET_MODE_INFO 0x4f01
338
#define VESA_SET_MODE 0x4f02
2302 decky 339
#define VESA_SET_PALETTE 0x4f09
1289 vana 340
 
341
#define CONFIG_VESA_BPP_a 255
342
 
1641 decky 343
#if CONFIG_VESA_BPP == 24
2302 decky 344
#define CONFIG_VESA_BPP_VARIANT 32
1289 vana 345
#endif
2302 decky 346
 
1641 decky 347
	mov $VESA_GET_INFO, %ax
348
	mov $e_vesa_init - vesa_init, %di
349
	push %di
350
	int $0x10
351
 
352
	pop %di
353
	cmp $VESA_OK, %al
354
	jnz 0f
355
 
356
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
357
	mov %si, %gs
358
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
359
 
360
	add $VESA_INFO_SIZE, %di
2302 decky 361
 
1289 vana 362
1:# Try next mode
1641 decky 363
	mov %gs:(%si), %cx
364
	cmp $VESA_END_OF_MODES, %cx
365
	jz 0f
366
 
367
	inc %si
368
	inc %si
369
	push %cx
370
	push %di
371
	push %si
372
	mov $VESA_GET_MODE_INFO, %ax
373
	int $0x10
374
 
375
	pop %si
376
	pop %di
377
	pop %cx
378
	cmp $VESA_OK, %al
379
	jnz 0f
380
 
381
	mov $CONFIG_VESA_WIDTH, %ax
382
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
383
	jnz 1b
384
 
385
	mov $CONFIG_VESA_HEIGHT, %ax
386
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
387
	jnz 1b
388
 
389
	mov $CONFIG_VESA_BPP, %al
390
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 391
 
392
#ifdef CONFIG_VESA_BPP_VARIANT
1641 decky 393
	jz 2f
394
 
2302 decky 395
	mov $CONFIG_VESA_BPP_VARIANT, %al
1641 decky 396
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 397
#endif
1641 decky 398
	jnz 1b
399
 
1289 vana 400
2:
401
 
1641 decky 402
	mov %cx, %bx
403
	or $0xc000, %bx
404
	push %di
405
	mov $VESA_SET_MODE, %ax
406
	int $0x10
1289 vana 407
 
1641 decky 408
	pop %di
409
	cmp $VESA_OK, %al
410
	jnz 0f
2302 decky 411
 
412
#if CONFIG_VESA_BPP == 8
1289 vana 413
 
2302 decky 414
	# Set 3:2:3 VGA palette
415
 
416
	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
417
	push %di
418
	mov $vga323 - vesa_init, %di
419
	mov $0x100, %ecx
420
 
2703 jermar 421
	bt $5, %ax						# Test if VGA compatible registers are present
2302 decky 422
	jnc vga_compat
423
 
424
		# Try VESA routine to set palette
425
 
426
		mov $VESA_SET_PALETTE, %ax
427
		xor %bl, %bl
428
		xor %dx, %dx
429
		int $0x10
430
 
431
		jmp vga_not_compat
432
 
433
	vga_compat:
434
 
435
		# Try VGA registers to set palette
436
 
2703 jermar 437
		movw $0x3c6, %dx				# Set palette mask
2302 decky 438
		movb $0xff, %al
439
		outb %al, %dx
440
 
2703 jermar 441
		movw $0x3c8, %dx				# First index to set
2302 decky 442
		xor %al, %al
443
		outb %al, %dx
444
 
2703 jermar 445
		movw $0x3c9, %dx				# Data port
2302 decky 446
		vga_loop:
447
			movb %es:2(%di), %al
448
			outb %al, %dx
449
 
450
			movb %es:1(%di), %al
451
			outb %al, %dx
452
 
453
			movb %es:(%di), %al
454
			outb %al, %dx
455
 
456
			addw $4, %di
457
			loop vga_loop
458
 
459
	vga_not_compat:
460
 
461
	pop %di
462
 
463
#endif
464
 
1641 decky 465
	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
466
	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
467
	shl $16, %eax
468
	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
469
	mov VESA_MODE_BPP_OFFSET(%di), %bl
470
	xor %bh, %bh
471
	shl $16, %ebx
472
	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
473
	mov %eax, %edi
474
 
475
8:
476
 
477
	mov %cr0, %eax
478
	or $1, %eax
479
	mov %eax, %cr0
480
 
481
	jmp 9f
1289 vana 482
9:
1641 decky 483
 
484
	ljmpl $gdtselector(KTEXT32_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
485
 
486
0:# No prefered mode found
487
	mov $0x111, %cx
488
	push %di
489
	push %cx
490
	mov $VESA_GET_MODE_INFO, %ax
491
	int $0x10
492
 
493
	pop %cx
494
	pop %di
495
	cmp $VESA_OK, %al
496
	jnz 1f
497
	jz 2b						# Force relative jump
1289 vana 498
 
1641 decky 499
1:
500
	mov $0x0003, %ax
501
	int $0x10
2703 jermar 502
	mov $0xffffffff, %edi				# EGA text mode used, because of problems with VESA
1641 decky 503
	xor %ax, %ax
504
	jz 8b						# Force relative jump
2302 decky 505
 
506
vga323:
507
#include "vga323.pal"	
1641 decky 508
 
1289 vana 509
.code32
1641 decky 510
vesa_init_protect:
511
	movw $gdtselector(KDATA_DES), %cx
512
	movw %cx, %es
2703 jermar 513
	movw %cx, %ds					# kernel data + stack
1641 decky 514
	movw %cx, %ss
515
	# Simics seems to remove hidden part of GS on entering user mode
516
	#  when _visible_ part of GS does not point to user-mode segment
517
	movw $gdtselector(UDATA_DES), %cx
518
	movw %cx, %fs
519
	movw %cx, %gs
520
 
2703 jermar 521
	movl $START_STACK, %esp				# initialize stack pointer
2222 decky 522
 
1641 decky 523
	jmpl $gdtselector(KTEXT32_DES), $vesa_meeting_point
524
 
1289 vana 525
.align 4
526
e_vesa_init:
2219 decky 527
#endif
528
 
529
# Print string from %esi to EGA display (in red) and halt
530
error_halt:
2703 jermar 531
	movl $0xb8000, %edi				# base of EGA text mode memory
2219 decky 532
	xorl %eax, %eax
533
 
2703 jermar 534
	movw $0x3d4, %dx				# read bits 8 - 15 of the cursor address
2219 decky 535
	movb $0xe, %al
536
	outb %al, %dx
537
 
538
	movw $0x3d5, %dx
539
	inb %dx, %al
540
	shl $8, %ax
541
 
2703 jermar 542
	movw $0x3d4, %dx				# read bits 0 - 7 of the cursor address
2219 decky 543
	movb $0xf, %al
544
	outb %al, %dx
545
 
546
	movw $0x3d5, %dx
547
	inb %dx, %al
548
 
549
	cmp $1920, %ax
550
	jbe cursor_ok
2703 jermar 551
		movw $1920, %ax				# sanity check for the cursor on the last line
2219 decky 552
	cursor_ok:
553
 
554
	movw %ax, %bx
555
	shl $1, %eax
556
	addl %eax, %edi
557
 
2703 jermar 558
	movw $0x0c00, %ax				# black background, light red foreground
2219 decky 559
	cld
560
 
561
	ploop:
562
		lodsb
563
		cmp $0, %al
564
		je ploop_end
565
		stosw
566
		inc %bx	
567
		jmp ploop
568
	ploop_end:
569
 
2703 jermar 570
	movw $0x3d4, %dx				# write bits 8 - 15 of the cursor address
2219 decky 571
	movb $0xe, %al
572
	outb %al, %dx
573
 
574
	movw $0x3d5, %dx
575
	movb %bh, %al
576
	outb %al, %dx
577
 
2703 jermar 578
	movw $0x3d4, %dx				# write bits 0 - 7 of the cursor address
2219 decky 579
	movb $0xf, %al
580
	outb %al, %dx
581
 
582
	movw $0x3d5, %dx
583
	movb %bl, %al
584
	outb %al, %dx
585
 
586
	cli
587
	hlt
206 palkovsky 588
 
2703 jermar 589
 
590
.section K_INI_PTLS, "aw", @progbits
591
 
592
#
593
# Macro for generating initial page table contents.
594
# @param cnt	Number of entries to generat. Must be multiple of 8.
595
# @param g	Number of GB that will be added to the mapping.
596
#
597
.macro ptl2gen cnt g 
598
.if \cnt
599
	ptl2gen "\cnt - 8" \g 
600
	.quad ((\cnt - 8) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
601
	.quad ((\cnt - 7) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
602
	.quad ((\cnt - 6) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
603
	.quad ((\cnt - 5) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
604
	.quad ((\cnt - 4) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
605
	.quad ((\cnt - 3) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
606
	.quad ((\cnt - 2) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
607
	.quad ((\cnt - 1) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
608
.endif
609
.endm
610
 
611
# Page table for pages in the first gigabyte.
164 palkovsky 612
.align 4096
2703 jermar 613
.global ptl_2_0g
614
ptl_2_0g:	
615
	ptl2gen 512 0
206 palkovsky 616
 
2703 jermar 617
# Page table for pages in the second gigabyte.
188 palkovsky 618
.align 4096
2703 jermar 619
.global ptl_2_1g
620
ptl_2_1g:
621
	ptl2gen 512 1
622
 
623
# Page table for pages in the third gigabyte.
624
.align 4096
625
.global ptl_2_2g
626
ptl_2_2g:
627
	ptl2gen 512 2
628
 
629
# Page table for pages in the fourth gigabyte.
630
.align 4096
631
.global ptl_2_3g
632
ptl_2_3g:
633
	ptl2gen 512 3
634
 
635
.align 4096
188 palkovsky 636
.global ptl_1
637
ptl_1:
2703 jermar 638
	# Identity mapping for [0; 4G)
639
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
640
	.quad ptl_2_1g + (PTL_WRITABLE | PTL_PRESENT) 
641
	.quad ptl_2_2g + (PTL_WRITABLE | PTL_PRESENT)
642
	.quad ptl_2_3g + (PTL_WRITABLE | PTL_PRESENT)
643
	.fill 506, 8, 0
644
	# Mapping of [0; 1G) at -2G
645
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
646
	.fill 1, 8, 0
188 palkovsky 647
 
648
.align 4096
649
.global ptl_0
650
ptl_0:
651
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 652
	.fill 255,8,0
188 palkovsky 653
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 654
	.fill 254,8,0
655
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 656
 
2703 jermar 657
.section K_DATA_START, "aw", @progbits
658
 
695 decky 659
.global bootstrap_gdtr
660
bootstrap_gdtr:
685 decky 661
	.word gdtselector(GDT_ITEMS)
662
	.long KA2PA(gdt)
695 decky 663
 
664
grub_eax:
665
	.long 0
666
 
667
grub_ebx:
668
	.long 0
2219 decky 669
 
2692 decky 670
extended_cpuid_msg:
671
	.asciz "Extended CPUID not supported. System halted."
2219 decky 672
long_mode_msg:
2302 decky 673
	.asciz "64 bit long mode not supported. System halted."
2692 decky 674
noexecute_msg:
675
	.asciz "No-execute pages not supported. System halted."
676
fx_msg:
677
	.asciz "FXSAVE/FXRESTORE instructions not supported. System halted."
678
sse2_msg:
679
	.asciz "SSE2 instructions not supported. System halted."