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3838 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:
2784 jermar 57
	cld
695 decky 58
	movl $START_STACK, %esp			# initialize stack pointer
2703 jermar 59
	lgdtl bootstrap_gdtr			# initialize Global Descriptor Table register
680 decky 60
 
685 decky 61
	movw $gdtselector(KDATA_DES), %cx
62
	movw %cx, %es
63
	movw %cx, %ds							# kernel data + stack
64
	movw %cx, %ss
807 palkovsky 65
	# Simics seems to remove hidden part of GS on entering user mode
66
	#  when _visible_ part of GS does not point to user-mode segment
67
	movw $gdtselector(UDATA_DES), %cx
68
	movw %cx, %fs
69
	movw %cx, %gs
685 decky 70
 
695 decky 71
	jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point
685 decky 72
	multiboot_meeting_point:
73
 
2703 jermar 74
	movl %eax, grub_eax						# save parameters from GRUB
695 decky 75
	movl %ebx, grub_ebx
76
 
2219 decky 77
	# Protected 32-bit. We want to reuse the code-seg descriptor,
78
	# the Default operand size must not be 1 when entering long mode
79
 
2692 decky 80
	movl $(INTEL_CPUID_EXTENDED), %eax  
2219 decky 81
 	cpuid
2692 decky 82
 	cmp $(INTEL_CPUID_EXTENDED), %eax
83
	ja extended_cpuid_supported
84
 
85
		movl $extended_cpuid_msg, %esi
86
		jmp error_halt
87
 
88
	extended_cpuid_supported:
89
 
90
	movl $(AMD_CPUID_EXTENDED), %eax
2219 decky 91
	cpuid
2692 decky 92
	bt $(AMD_EXT_LONG_MODE), %edx
2219 decky 93
 	jc long_mode_supported
2692 decky 94
 
2219 decky 95
		movl $long_mode_msg, %esi
96
		jmp error_halt
2692 decky 97
 
2219 decky 98
	long_mode_supported:
99
 
2692 decky 100
	bt $(AMD_EXT_NOEXECUTE), %edx
101
	jc noexecute_supported
102
 
103
		movl $noexecute_msg, %esi
104
		jmp error_halt
105
 
106
	noexecute_supported:
107
 
108
	movl $(INTEL_CPUID_STANDARD), %eax
109
	cpuid
110
	bt $(INTEL_FXSAVE), %edx
111
 	jc fx_supported
112
 
113
		movl $fx_msg, %esi
114
		jmp error_halt
115
 
116
	fx_supported:
117
 
118
	bt $(INTEL_SSE2), %edx
119
 	jc sse2_supported
120
 
121
		movl $sse2_msg, %esi
122
		jmp error_halt
123
 
124
	sse2_supported:
125
 
1289 vana 126
#ifdef CONFIG_FB
2219 decky 127
	mov $vesa_init, %esi
1641 decky 128
	mov $VESA_INIT_SEGMENT << 4, %edi
129
	mov $e_vesa_init - vesa_init, %ecx
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
	rep movsb
286
 
287
#endif
288
 
694 decky 289
	call main_bsp   # never returns
178 palkovsky 290
 
694 decky 291
	cli
292
	hlt
1289 vana 293
 
294
#ifdef CONFIG_FB
295
.code32
296
vesa_init:
1641 decky 297
	jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
298
 
1289 vana 299
.code16
1641 decky 300
vesa_init_real:
1289 vana 301
 
1641 decky 302
	mov %cr0, %eax
303
	and $~1, %eax
304
	mov %eax, %cr0
305
 
306
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
307
 
308
vesa_init_real2:
309
 
310
	mov $VESA_INIT_SEGMENT, %bx
311
 
312
	mov %bx, %es
313
	mov %bx, %fs
314
	mov %bx, %gs
315
	mov %bx, %ds
316
	mov %bx, %ss
317
 
318
	movl $0x0000fffc, %esp
2713 decky 319
	movl $0x0000fffc, %ebp
1641 decky 320
 
1289 vana 321
#define VESA_INFO_SIZE 1024
322
 
2302 decky 323
#define VESA_MODE_ATTRIBUTES_OFFSET 0
1641 decky 324
#define VESA_MODE_LIST_PTR_OFFSET 14
2302 decky 325
#define VESA_MODE_SCANLINE_OFFSET 16
1289 vana 326
#define VESA_MODE_WIDTH_OFFSET 18
327
#define VESA_MODE_HEIGHT_OFFSET 20
328
#define VESA_MODE_BPP_OFFSET 25
329
#define VESA_MODE_PHADDR_OFFSET 40
330
 
1641 decky 331
#define VESA_END_OF_MODES 0xffff
1289 vana 332
 
1641 decky 333
#define VESA_OK 0x4f
1289 vana 334
 
1641 decky 335
#define VESA_GET_INFO 0x4f00
1289 vana 336
#define VESA_GET_MODE_INFO 0x4f01
337
#define VESA_SET_MODE 0x4f02
2302 decky 338
#define VESA_SET_PALETTE 0x4f09
1289 vana 339
 
340
#define CONFIG_VESA_BPP_a 255
341
 
1641 decky 342
#if CONFIG_VESA_BPP == 24
2302 decky 343
#define CONFIG_VESA_BPP_VARIANT 32
1289 vana 344
#endif
2302 decky 345
 
1641 decky 346
	mov $VESA_GET_INFO, %ax
347
	mov $e_vesa_init - vesa_init, %di
348
	push %di
349
	int $0x10
350
 
351
	pop %di
352
	cmp $VESA_OK, %al
353
	jnz 0f
354
 
355
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
356
	mov %si, %gs
357
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
358
 
359
	add $VESA_INFO_SIZE, %di
2302 decky 360
 
1289 vana 361
1:# Try next mode
1641 decky 362
	mov %gs:(%si), %cx
363
	cmp $VESA_END_OF_MODES, %cx
364
	jz 0f
365
 
366
	inc %si
367
	inc %si
368
	push %cx
369
	push %di
370
	push %si
371
	mov $VESA_GET_MODE_INFO, %ax
372
	int $0x10
373
 
374
	pop %si
375
	pop %di
376
	pop %cx
377
	cmp $VESA_OK, %al
378
	jnz 0f
379
 
380
	mov $CONFIG_VESA_WIDTH, %ax
381
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
382
	jnz 1b
383
 
384
	mov $CONFIG_VESA_HEIGHT, %ax
385
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
386
	jnz 1b
387
 
388
	mov $CONFIG_VESA_BPP, %al
389
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 390
 
391
#ifdef CONFIG_VESA_BPP_VARIANT
1641 decky 392
	jz 2f
393
 
2302 decky 394
	mov $CONFIG_VESA_BPP_VARIANT, %al
1641 decky 395
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 396
#endif
1641 decky 397
	jnz 1b
398
 
1289 vana 399
2:
400
 
1641 decky 401
	mov %cx, %bx
402
	or $0xc000, %bx
403
	push %di
404
	mov $VESA_SET_MODE, %ax
405
	int $0x10
1289 vana 406
 
1641 decky 407
	pop %di
408
	cmp $VESA_OK, %al
409
	jnz 0f
2302 decky 410
 
411
#if CONFIG_VESA_BPP == 8
1289 vana 412
 
2302 decky 413
	# Set 3:2:3 VGA palette
414
 
415
	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
416
	push %di
417
	mov $vga323 - vesa_init, %di
418
	mov $0x100, %ecx
419
 
2703 jermar 420
	bt $5, %ax						# Test if VGA compatible registers are present
2302 decky 421
	jnc vga_compat
422
 
423
		# Try VESA routine to set palette
424
 
425
		mov $VESA_SET_PALETTE, %ax
426
		xor %bl, %bl
427
		xor %dx, %dx
428
		int $0x10
429
 
3802 decky 430
		cmp $0x00, %ah
431
		je vga_not_compat
2302 decky 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
 
560
	ploop:
561
		lodsb
562
		cmp $0, %al
563
		je ploop_end
564
		stosw
565
		inc %bx	
566
		jmp ploop
567
	ploop_end:
568
 
2703 jermar 569
	movw $0x3d4, %dx				# write bits 8 - 15 of the cursor address
2219 decky 570
	movb $0xe, %al
571
	outb %al, %dx
572
 
573
	movw $0x3d5, %dx
574
	movb %bh, %al
575
	outb %al, %dx
576
 
2703 jermar 577
	movw $0x3d4, %dx				# write bits 0 - 7 of the cursor address
2219 decky 578
	movb $0xf, %al
579
	outb %al, %dx
580
 
581
	movw $0x3d5, %dx
582
	movb %bl, %al
583
	outb %al, %dx
584
 
585
	cli
586
	hlt
206 palkovsky 587
 
2703 jermar 588
 
589
.section K_INI_PTLS, "aw", @progbits
590
 
591
#
592
# Macro for generating initial page table contents.
593
# @param cnt	Number of entries to generat. Must be multiple of 8.
594
# @param g	Number of GB that will be added to the mapping.
595
#
596
.macro ptl2gen cnt g 
597
.if \cnt
598
	ptl2gen "\cnt - 8" \g 
599
	.quad ((\cnt - 8) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
600
	.quad ((\cnt - 7) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
601
	.quad ((\cnt - 6) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
602
	.quad ((\cnt - 5) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
603
	.quad ((\cnt - 4) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
604
	.quad ((\cnt - 3) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
605
	.quad ((\cnt - 2) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
606
	.quad ((\cnt - 1) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
607
.endif
608
.endm
609
 
610
# Page table for pages in the first gigabyte.
164 palkovsky 611
.align 4096
2703 jermar 612
.global ptl_2_0g
613
ptl_2_0g:	
614
	ptl2gen 512 0
206 palkovsky 615
 
2703 jermar 616
# Page table for pages in the second gigabyte.
188 palkovsky 617
.align 4096
2703 jermar 618
.global ptl_2_1g
619
ptl_2_1g:
620
	ptl2gen 512 1
621
 
622
# Page table for pages in the third gigabyte.
623
.align 4096
624
.global ptl_2_2g
625
ptl_2_2g:
626
	ptl2gen 512 2
627
 
628
# Page table for pages in the fourth gigabyte.
629
.align 4096
630
.global ptl_2_3g
631
ptl_2_3g:
632
	ptl2gen 512 3
633
 
634
.align 4096
188 palkovsky 635
.global ptl_1
636
ptl_1:
2703 jermar 637
	# Identity mapping for [0; 4G)
638
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
639
	.quad ptl_2_1g + (PTL_WRITABLE | PTL_PRESENT) 
640
	.quad ptl_2_2g + (PTL_WRITABLE | PTL_PRESENT)
641
	.quad ptl_2_3g + (PTL_WRITABLE | PTL_PRESENT)
642
	.fill 506, 8, 0
643
	# Mapping of [0; 1G) at -2G
644
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
645
	.fill 1, 8, 0
188 palkovsky 646
 
647
.align 4096
648
.global ptl_0
649
ptl_0:
650
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 651
	.fill 255,8,0
188 palkovsky 652
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 653
	.fill 254,8,0
654
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 655
 
2703 jermar 656
.section K_DATA_START, "aw", @progbits
657
 
695 decky 658
.global bootstrap_gdtr
659
bootstrap_gdtr:
685 decky 660
	.word gdtselector(GDT_ITEMS)
661
	.long KA2PA(gdt)
695 decky 662
 
663
grub_eax:
664
	.long 0
665
 
666
grub_ebx:
667
	.long 0
2219 decky 668
 
2692 decky 669
extended_cpuid_msg:
670
	.asciz "Extended CPUID not supported. System halted."
2219 decky 671
long_mode_msg:
2302 decky 672
	.asciz "64 bit long mode not supported. System halted."
2692 decky 673
noexecute_msg:
674
	.asciz "No-execute pages not supported. System halted."
675
fx_msg:
676
	.asciz "FXSAVE/FXRESTORE instructions not supported. System halted."
677
sse2_msg:
678
	.asciz "SSE2 instructions not supported. System halted."