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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, e801memorysize
186
		movl %ecx, e820counter
187
 
188
		jmp invalid_boot
189
 
190
	valid_boot:
191
 
2703 jermar 192
		movl (%ebx), %eax				# ebx = physical address of struct multiboot_info
695 decky 193
 
2703 jermar 194
		bt $0, %eax					# mbi->flags[0] (mem_lower, mem_upper valid)
695 decky 195
		jc mem_valid
196
 
197
			xorl %ecx, %ecx
198
			jmp mem_invalid
199
 
200
		mem_valid:
2703 jermar 201
		movl 4(%ebx), %ecx				# mbi->mem_lower
202
		addl 8(%ebx), %ecx				# mbi->mem_upper
695 decky 203
 
204
		mem_invalid:
205
		movl %ecx, e801memorysize
206
 
2703 jermar 207
		bt $3, %eax					# mbi->flags[3] (mods_count, mods_addr valid)
695 decky 208
		jc mods_valid
209
 
1052 decky 210
			xorq %rcx, %rcx
211
			movq %rcx, init
1039 decky 212
			jmp mods_end
695 decky 213
 
214
		mods_valid:
1039 decky 215
 
216
		xorq %rcx, %rcx
2703 jermar 217
		movl 20(%ebx), %ecx				# mbi->mods_count
1052 decky 218
		movq %rcx, init
1039 decky 219
 
695 decky 220
		cmpl $0, %ecx
1039 decky 221
		je mods_end
695 decky 222
 
2703 jermar 223
		movl 24(%ebx), %esi				# mbi->mods_addr
1039 decky 224
		movq $init, %rdi
695 decky 225
 
1039 decky 226
		mods_loop:
227
 
228
			xorq %rdx, %rdx
2703 jermar 229
			movl 0(%esi), %edx			# mods->mod_start
1063 palkovsky 230
			movq $0xffff800000000000, %r10
231
			addq %r10, %rdx
1052 decky 232
			movq %rdx, 8(%rdi)
1039 decky 233
 
234
			xorq %rdx, %rdx
235
			movl 4(%esi), %edx
2703 jermar 236
			subl 0(%esi), %edx			# mods->mod_end - mods->mod_start
1052 decky 237
			movq %rdx, 16(%rdi)
1039 decky 238
 
239
			addl $16, %esi
240
			addq $16, %rdi
241
 
242
			loop mods_loop
243
 
244
		mods_end:
695 decky 245
 
2703 jermar 246
		bt $6, %eax					# mbi->flags[6] (mmap_length, mmap_addr valid)	
695 decky 247
		jc mmap_valid
248
 
249
			xorl %edx, %edx
250
			jmp mmap_invalid
251
 
252
		mmap_valid:
2703 jermar 253
		movl 44(%ebx), %ecx				# mbi->mmap_length
254
		movl 48(%ebx), %esi				# mbi->mmap_addr
695 decky 255
		movq $e820table, %rdi
256
		xorl %edx, %edx
257
 
258
		mmap_loop:
259
			cmpl $0, %ecx
260
			jle mmap_end
261
 
2703 jermar 262
			movl 4(%esi), %eax			# mmap->base_addr_low
695 decky 263
			movl %eax, (%rdi)
264
 
2703 jermar 265
			movl 8(%esi), %eax			# mmap->base_addr_high
695 decky 266
			movl %eax, 4(%rdi)
267
 
2703 jermar 268
			movl 12(%esi), %eax			# mmap->length_low
695 decky 269
			movl %eax, 8(%rdi)
270
 
2703 jermar 271
			movl 16(%esi), %eax			# mmap->length_high
695 decky 272
			movl %eax, 12(%rdi)
273
 
2703 jermar 274
			movl 20(%esi), %eax			# mmap->type
695 decky 275
			movl %eax, 16(%rdi)
276
 
2703 jermar 277
			movl (%esi), %eax			# mmap->size
695 decky 278
			addl $0x4, %eax
279
			addl %eax, %esi
280
			subl %eax, %ecx
281
			addq $MEMMAP_E820_RECORD_SIZE, %rdi
282
			incl %edx
283
			jmp mmap_loop
284
 
285
		mmap_end:
286
 
287
		mmap_invalid:
288
		movl %edx, e820counter
289
 
290
	invalid_boot:
291
 
696 decky 292
#ifdef CONFIG_SMP
293
 
294
	# copy AP bootstrap routines below 1 MB
295
 
296
	movq $BOOT_OFFSET, %rsi
297
	movq $AP_BOOT_OFFSET, %rdi
298
	movq $_hardcoded_unmapped_size, %rcx
299
	cld
300
	rep movsb
301
 
302
#endif
303
 
694 decky 304
	call main_bsp   # never returns
178 palkovsky 305
 
694 decky 306
	cli
307
	hlt
1289 vana 308
 
309
#ifdef CONFIG_FB
310
.code32
311
vesa_init:
1641 decky 312
	jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
313
 
1289 vana 314
.code16
1641 decky 315
vesa_init_real:
1289 vana 316
 
1641 decky 317
	mov %cr0, %eax
318
	and $~1, %eax
319
	mov %eax, %cr0
320
 
321
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
322
 
323
vesa_init_real2:
324
 
325
	mov $VESA_INIT_SEGMENT, %bx
326
 
327
	mov %bx, %es
328
	mov %bx, %fs
329
	mov %bx, %gs
330
	mov %bx, %ds
331
	mov %bx, %ss
332
 
333
	movl $0x0000fffc, %esp
334
    movl $0x0000fffc, %ebp
335
 
1289 vana 336
#define VESA_INFO_SIZE 1024
337
 
2302 decky 338
#define VESA_MODE_ATTRIBUTES_OFFSET 0
1641 decky 339
#define VESA_MODE_LIST_PTR_OFFSET 14
2302 decky 340
#define VESA_MODE_SCANLINE_OFFSET 16
1289 vana 341
#define VESA_MODE_WIDTH_OFFSET 18
342
#define VESA_MODE_HEIGHT_OFFSET 20
343
#define VESA_MODE_BPP_OFFSET 25
344
#define VESA_MODE_PHADDR_OFFSET 40
345
 
1641 decky 346
#define VESA_END_OF_MODES 0xffff
1289 vana 347
 
1641 decky 348
#define VESA_OK 0x4f
1289 vana 349
 
1641 decky 350
#define VESA_GET_INFO 0x4f00
1289 vana 351
#define VESA_GET_MODE_INFO 0x4f01
352
#define VESA_SET_MODE 0x4f02
2302 decky 353
#define VESA_SET_PALETTE 0x4f09
1289 vana 354
 
355
#define CONFIG_VESA_BPP_a 255
356
 
1641 decky 357
#if CONFIG_VESA_BPP == 24
2302 decky 358
#define CONFIG_VESA_BPP_VARIANT 32
1289 vana 359
#endif
2302 decky 360
 
1641 decky 361
	mov $VESA_GET_INFO, %ax
362
	mov $e_vesa_init - vesa_init, %di
363
	push %di
364
	int $0x10
365
 
366
	pop %di
367
	cmp $VESA_OK, %al
368
	jnz 0f
369
 
370
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
371
	mov %si, %gs
372
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
373
 
374
	add $VESA_INFO_SIZE, %di
2302 decky 375
 
1289 vana 376
1:# Try next mode
1641 decky 377
	mov %gs:(%si), %cx
378
	cmp $VESA_END_OF_MODES, %cx
379
	jz 0f
380
 
381
	inc %si
382
	inc %si
383
	push %cx
384
	push %di
385
	push %si
386
	mov $VESA_GET_MODE_INFO, %ax
387
	int $0x10
388
 
389
	pop %si
390
	pop %di
391
	pop %cx
392
	cmp $VESA_OK, %al
393
	jnz 0f
394
 
395
	mov $CONFIG_VESA_WIDTH, %ax
396
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
397
	jnz 1b
398
 
399
	mov $CONFIG_VESA_HEIGHT, %ax
400
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
401
	jnz 1b
402
 
403
	mov $CONFIG_VESA_BPP, %al
404
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 405
 
406
#ifdef CONFIG_VESA_BPP_VARIANT
1641 decky 407
	jz 2f
408
 
2302 decky 409
	mov $CONFIG_VESA_BPP_VARIANT, %al
1641 decky 410
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 411
#endif
1641 decky 412
	jnz 1b
413
 
1289 vana 414
2:
415
 
1641 decky 416
	mov %cx, %bx
417
	or $0xc000, %bx
418
	push %di
419
	mov $VESA_SET_MODE, %ax
420
	int $0x10
1289 vana 421
 
1641 decky 422
	pop %di
423
	cmp $VESA_OK, %al
424
	jnz 0f
2302 decky 425
 
426
#if CONFIG_VESA_BPP == 8
1289 vana 427
 
2302 decky 428
	# Set 3:2:3 VGA palette
429
 
430
	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
431
	push %di
432
	mov $vga323 - vesa_init, %di
433
	mov $0x100, %ecx
434
 
2703 jermar 435
	bt $5, %ax						# Test if VGA compatible registers are present
2302 decky 436
	jnc vga_compat
437
 
438
		# Try VESA routine to set palette
439
 
440
		mov $VESA_SET_PALETTE, %ax
441
		xor %bl, %bl
442
		xor %dx, %dx
443
		int $0x10
444
 
445
		jmp vga_not_compat
446
 
447
	vga_compat:
448
 
449
		# Try VGA registers to set palette
450
 
2703 jermar 451
		movw $0x3c6, %dx				# Set palette mask
2302 decky 452
		movb $0xff, %al
453
		outb %al, %dx
454
 
2703 jermar 455
		movw $0x3c8, %dx				# First index to set
2302 decky 456
		xor %al, %al
457
		outb %al, %dx
458
 
2703 jermar 459
		movw $0x3c9, %dx				# Data port
2302 decky 460
		vga_loop:
461
			movb %es:2(%di), %al
462
			outb %al, %dx
463
 
464
			movb %es:1(%di), %al
465
			outb %al, %dx
466
 
467
			movb %es:(%di), %al
468
			outb %al, %dx
469
 
470
			addw $4, %di
471
			loop vga_loop
472
 
473
	vga_not_compat:
474
 
475
	pop %di
476
 
477
#endif
478
 
1641 decky 479
	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
480
	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
481
	shl $16, %eax
482
	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
483
	mov VESA_MODE_BPP_OFFSET(%di), %bl
484
	xor %bh, %bh
485
	shl $16, %ebx
486
	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
487
	mov %eax, %edi
488
 
489
8:
490
 
491
	mov %cr0, %eax
492
	or $1, %eax
493
	mov %eax, %cr0
494
 
495
	jmp 9f
1289 vana 496
9:
1641 decky 497
 
498
	ljmpl $gdtselector(KTEXT32_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
499
 
500
0:# No prefered mode found
501
	mov $0x111, %cx
502
	push %di
503
	push %cx
504
	mov $VESA_GET_MODE_INFO, %ax
505
	int $0x10
506
 
507
	pop %cx
508
	pop %di
509
	cmp $VESA_OK, %al
510
	jnz 1f
511
	jz 2b						# Force relative jump
1289 vana 512
 
1641 decky 513
1:
514
	mov $0x0003, %ax
515
	int $0x10
2703 jermar 516
	mov $0xffffffff, %edi				# EGA text mode used, because of problems with VESA
1641 decky 517
	xor %ax, %ax
518
	jz 8b						# Force relative jump
2302 decky 519
 
520
vga323:
521
#include "vga323.pal"	
1641 decky 522
 
1289 vana 523
.code32
1641 decky 524
vesa_init_protect:
525
	movw $gdtselector(KDATA_DES), %cx
526
	movw %cx, %es
2703 jermar 527
	movw %cx, %ds					# kernel data + stack
1641 decky 528
	movw %cx, %ss
529
	# Simics seems to remove hidden part of GS on entering user mode
530
	#  when _visible_ part of GS does not point to user-mode segment
531
	movw $gdtselector(UDATA_DES), %cx
532
	movw %cx, %fs
533
	movw %cx, %gs
534
 
2703 jermar 535
	movl $START_STACK, %esp				# initialize stack pointer
2222 decky 536
 
1641 decky 537
	jmpl $gdtselector(KTEXT32_DES), $vesa_meeting_point
538
 
1289 vana 539
.align 4
540
e_vesa_init:
2219 decky 541
#endif
542
 
543
# Print string from %esi to EGA display (in red) and halt
544
error_halt:
2703 jermar 545
	movl $0xb8000, %edi				# base of EGA text mode memory
2219 decky 546
	xorl %eax, %eax
547
 
2703 jermar 548
	movw $0x3d4, %dx				# read bits 8 - 15 of the cursor address
2219 decky 549
	movb $0xe, %al
550
	outb %al, %dx
551
 
552
	movw $0x3d5, %dx
553
	inb %dx, %al
554
	shl $8, %ax
555
 
2703 jermar 556
	movw $0x3d4, %dx				# read bits 0 - 7 of the cursor address
2219 decky 557
	movb $0xf, %al
558
	outb %al, %dx
559
 
560
	movw $0x3d5, %dx
561
	inb %dx, %al
562
 
563
	cmp $1920, %ax
564
	jbe cursor_ok
2703 jermar 565
		movw $1920, %ax				# sanity check for the cursor on the last line
2219 decky 566
	cursor_ok:
567
 
568
	movw %ax, %bx
569
	shl $1, %eax
570
	addl %eax, %edi
571
 
2703 jermar 572
	movw $0x0c00, %ax				# black background, light red foreground
2219 decky 573
	cld
574
 
575
	ploop:
576
		lodsb
577
		cmp $0, %al
578
		je ploop_end
579
		stosw
580
		inc %bx	
581
		jmp ploop
582
	ploop_end:
583
 
2703 jermar 584
	movw $0x3d4, %dx				# write bits 8 - 15 of the cursor address
2219 decky 585
	movb $0xe, %al
586
	outb %al, %dx
587
 
588
	movw $0x3d5, %dx
589
	movb %bh, %al
590
	outb %al, %dx
591
 
2703 jermar 592
	movw $0x3d4, %dx				# write bits 0 - 7 of the cursor address
2219 decky 593
	movb $0xf, %al
594
	outb %al, %dx
595
 
596
	movw $0x3d5, %dx
597
	movb %bl, %al
598
	outb %al, %dx
599
 
600
	cli
601
	hlt
206 palkovsky 602
 
2703 jermar 603
 
604
.section K_INI_PTLS, "aw", @progbits
605
 
606
#
607
# Macro for generating initial page table contents.
608
# @param cnt	Number of entries to generat. Must be multiple of 8.
609
# @param g	Number of GB that will be added to the mapping.
610
#
611
.macro ptl2gen cnt g 
612
.if \cnt
613
	ptl2gen "\cnt - 8" \g 
614
	.quad ((\cnt - 8) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
615
	.quad ((\cnt - 7) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
616
	.quad ((\cnt - 6) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
617
	.quad ((\cnt - 5) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
618
	.quad ((\cnt - 4) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
619
	.quad ((\cnt - 3) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
620
	.quad ((\cnt - 2) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
621
	.quad ((\cnt - 1) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
622
.endif
623
.endm
624
 
625
# Page table for pages in the first gigabyte.
164 palkovsky 626
.align 4096
2703 jermar 627
.global ptl_2_0g
628
ptl_2_0g:	
629
	ptl2gen 512 0
206 palkovsky 630
 
2703 jermar 631
# Page table for pages in the second gigabyte.
188 palkovsky 632
.align 4096
2703 jermar 633
.global ptl_2_1g
634
ptl_2_1g:
635
	ptl2gen 512 1
636
 
637
# Page table for pages in the third gigabyte.
638
.align 4096
639
.global ptl_2_2g
640
ptl_2_2g:
641
	ptl2gen 512 2
642
 
643
# Page table for pages in the fourth gigabyte.
644
.align 4096
645
.global ptl_2_3g
646
ptl_2_3g:
647
	ptl2gen 512 3
648
 
649
.align 4096
188 palkovsky 650
.global ptl_1
651
ptl_1:
2703 jermar 652
	# Identity mapping for [0; 4G)
653
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
654
	.quad ptl_2_1g + (PTL_WRITABLE | PTL_PRESENT) 
655
	.quad ptl_2_2g + (PTL_WRITABLE | PTL_PRESENT)
656
	.quad ptl_2_3g + (PTL_WRITABLE | PTL_PRESENT)
657
	.fill 506, 8, 0
658
	# Mapping of [0; 1G) at -2G
659
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
660
	.fill 1, 8, 0
188 palkovsky 661
 
662
.align 4096
663
.global ptl_0
664
ptl_0:
665
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 666
	.fill 255,8,0
188 palkovsky 667
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 668
	.fill 254,8,0
669
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 670
 
2703 jermar 671
.section K_DATA_START, "aw", @progbits
672
 
695 decky 673
.global bootstrap_gdtr
674
bootstrap_gdtr:
685 decky 675
	.word gdtselector(GDT_ITEMS)
676
	.long KA2PA(gdt)
695 decky 677
 
678
grub_eax:
679
	.long 0
680
 
681
grub_ebx:
682
	.long 0
2219 decky 683
 
2692 decky 684
extended_cpuid_msg:
685
	.asciz "Extended CPUID not supported. System halted."
2219 decky 686
long_mode_msg:
2302 decky 687
	.asciz "64 bit long mode not supported. System halted."
2692 decky 688
noexecute_msg:
689
	.asciz "No-execute pages not supported. System halted."
690
fx_msg:
691
	.asciz "FXSAVE/FXRESTORE instructions not supported. System halted."
692
sse2_msg:
693
	.asciz "SSE2 instructions not supported. System halted."