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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
4022 svoboda 178
 
179
	# arch_pre_main(grub_eax, grub_ebx)
180
	xorq %rdi, %rdi
181
	movl grub_eax, %edi
182
	xorq %rsi, %rsi
183
	movl grub_ebx, %esi
184
	call arch_pre_main
185
 
186
	call main_bsp  
187
 
188
	# Not reached.
695 decky 189
 
694 decky 190
	cli
191
	hlt
1289 vana 192
 
193
#ifdef CONFIG_FB
194
.code32
195
vesa_init:
1641 decky 196
	jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
197
 
1289 vana 198
.code16
1641 decky 199
vesa_init_real:
1289 vana 200
 
1641 decky 201
	mov %cr0, %eax
202
	and $~1, %eax
203
	mov %eax, %cr0
204
 
205
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
206
 
207
vesa_init_real2:
208
 
209
	mov $VESA_INIT_SEGMENT, %bx
210
 
211
	mov %bx, %es
212
	mov %bx, %fs
213
	mov %bx, %gs
214
	mov %bx, %ds
215
	mov %bx, %ss
216
 
217
	movl $0x0000fffc, %esp
2713 decky 218
	movl $0x0000fffc, %ebp
1641 decky 219
 
1289 vana 220
#define VESA_INFO_SIZE 1024
221
 
2302 decky 222
#define VESA_MODE_ATTRIBUTES_OFFSET 0
1641 decky 223
#define VESA_MODE_LIST_PTR_OFFSET 14
2302 decky 224
#define VESA_MODE_SCANLINE_OFFSET 16
1289 vana 225
#define VESA_MODE_WIDTH_OFFSET 18
226
#define VESA_MODE_HEIGHT_OFFSET 20
227
#define VESA_MODE_BPP_OFFSET 25
228
#define VESA_MODE_PHADDR_OFFSET 40
229
 
1641 decky 230
#define VESA_END_OF_MODES 0xffff
1289 vana 231
 
1641 decky 232
#define VESA_OK 0x4f
1289 vana 233
 
1641 decky 234
#define VESA_GET_INFO 0x4f00
1289 vana 235
#define VESA_GET_MODE_INFO 0x4f01
236
#define VESA_SET_MODE 0x4f02
2302 decky 237
#define VESA_SET_PALETTE 0x4f09
1289 vana 238
 
239
#define CONFIG_VESA_BPP_a 255
240
 
1641 decky 241
#if CONFIG_VESA_BPP == 24
2302 decky 242
#define CONFIG_VESA_BPP_VARIANT 32
1289 vana 243
#endif
2302 decky 244
 
1641 decky 245
	mov $VESA_GET_INFO, %ax
246
	mov $e_vesa_init - vesa_init, %di
247
	push %di
248
	int $0x10
249
 
250
	pop %di
251
	cmp $VESA_OK, %al
252
	jnz 0f
253
 
254
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
255
	mov %si, %gs
256
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
257
 
258
	add $VESA_INFO_SIZE, %di
2302 decky 259
 
1289 vana 260
1:# Try next mode
1641 decky 261
	mov %gs:(%si), %cx
262
	cmp $VESA_END_OF_MODES, %cx
263
	jz 0f
264
 
265
	inc %si
266
	inc %si
267
	push %cx
268
	push %di
269
	push %si
270
	mov $VESA_GET_MODE_INFO, %ax
271
	int $0x10
272
 
273
	pop %si
274
	pop %di
275
	pop %cx
276
	cmp $VESA_OK, %al
277
	jnz 0f
278
 
279
	mov $CONFIG_VESA_WIDTH, %ax
280
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
281
	jnz 1b
282
 
283
	mov $CONFIG_VESA_HEIGHT, %ax
284
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
285
	jnz 1b
286
 
287
	mov $CONFIG_VESA_BPP, %al
288
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 289
 
290
#ifdef CONFIG_VESA_BPP_VARIANT
1641 decky 291
	jz 2f
292
 
2302 decky 293
	mov $CONFIG_VESA_BPP_VARIANT, %al
1641 decky 294
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 295
#endif
1641 decky 296
	jnz 1b
297
 
1289 vana 298
2:
299
 
1641 decky 300
	mov %cx, %bx
301
	or $0xc000, %bx
302
	push %di
303
	mov $VESA_SET_MODE, %ax
304
	int $0x10
1289 vana 305
 
1641 decky 306
	pop %di
307
	cmp $VESA_OK, %al
308
	jnz 0f
2302 decky 309
 
310
#if CONFIG_VESA_BPP == 8
1289 vana 311
 
2302 decky 312
	# Set 3:2:3 VGA palette
313
 
314
	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
315
	push %di
316
	mov $vga323 - vesa_init, %di
317
	mov $0x100, %ecx
318
 
2703 jermar 319
	bt $5, %ax						# Test if VGA compatible registers are present
2302 decky 320
	jnc vga_compat
321
 
322
		# Try VESA routine to set palette
323
 
324
		mov $VESA_SET_PALETTE, %ax
325
		xor %bl, %bl
326
		xor %dx, %dx
327
		int $0x10
328
 
3802 decky 329
		cmp $0x00, %ah
330
		je vga_not_compat
2302 decky 331
 
332
	vga_compat:
333
 
334
		# Try VGA registers to set palette
335
 
2703 jermar 336
		movw $0x3c6, %dx				# Set palette mask
2302 decky 337
		movb $0xff, %al
338
		outb %al, %dx
339
 
2703 jermar 340
		movw $0x3c8, %dx				# First index to set
2302 decky 341
		xor %al, %al
342
		outb %al, %dx
343
 
2703 jermar 344
		movw $0x3c9, %dx				# Data port
2302 decky 345
		vga_loop:
346
			movb %es:2(%di), %al
347
			outb %al, %dx
348
 
349
			movb %es:1(%di), %al
350
			outb %al, %dx
351
 
352
			movb %es:(%di), %al
353
			outb %al, %dx
354
 
355
			addw $4, %di
356
			loop vga_loop
357
 
358
	vga_not_compat:
359
 
360
	pop %di
361
 
362
#endif
363
 
1641 decky 364
	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
365
	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
366
	shl $16, %eax
367
	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
368
	mov VESA_MODE_BPP_OFFSET(%di), %bl
369
	xor %bh, %bh
370
	shl $16, %ebx
371
	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
372
	mov %eax, %edi
373
 
374
8:
375
 
376
	mov %cr0, %eax
377
	or $1, %eax
378
	mov %eax, %cr0
379
 
380
	jmp 9f
1289 vana 381
9:
1641 decky 382
 
383
	ljmpl $gdtselector(KTEXT32_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
384
 
385
0:# No prefered mode found
386
	mov $0x111, %cx
387
	push %di
388
	push %cx
389
	mov $VESA_GET_MODE_INFO, %ax
390
	int $0x10
391
 
392
	pop %cx
393
	pop %di
394
	cmp $VESA_OK, %al
395
	jnz 1f
396
	jz 2b						# Force relative jump
1289 vana 397
 
1641 decky 398
1:
399
	mov $0x0003, %ax
400
	int $0x10
2703 jermar 401
	mov $0xffffffff, %edi				# EGA text mode used, because of problems with VESA
1641 decky 402
	xor %ax, %ax
403
	jz 8b						# Force relative jump
2302 decky 404
 
405
vga323:
406
#include "vga323.pal"	
1641 decky 407
 
1289 vana 408
.code32
1641 decky 409
vesa_init_protect:
410
	movw $gdtselector(KDATA_DES), %cx
411
	movw %cx, %es
2703 jermar 412
	movw %cx, %ds					# kernel data + stack
1641 decky 413
	movw %cx, %ss
414
	# Simics seems to remove hidden part of GS on entering user mode
415
	#  when _visible_ part of GS does not point to user-mode segment
416
	movw $gdtselector(UDATA_DES), %cx
417
	movw %cx, %fs
418
	movw %cx, %gs
419
 
2703 jermar 420
	movl $START_STACK, %esp				# initialize stack pointer
2222 decky 421
 
1641 decky 422
	jmpl $gdtselector(KTEXT32_DES), $vesa_meeting_point
423
 
1289 vana 424
.align 4
425
e_vesa_init:
2219 decky 426
#endif
427
 
428
# Print string from %esi to EGA display (in red) and halt
429
error_halt:
2703 jermar 430
	movl $0xb8000, %edi				# base of EGA text mode memory
2219 decky 431
	xorl %eax, %eax
432
 
2703 jermar 433
	movw $0x3d4, %dx				# read bits 8 - 15 of the cursor address
2219 decky 434
	movb $0xe, %al
435
	outb %al, %dx
436
 
437
	movw $0x3d5, %dx
438
	inb %dx, %al
439
	shl $8, %ax
440
 
2703 jermar 441
	movw $0x3d4, %dx				# read bits 0 - 7 of the cursor address
2219 decky 442
	movb $0xf, %al
443
	outb %al, %dx
444
 
445
	movw $0x3d5, %dx
446
	inb %dx, %al
447
 
448
	cmp $1920, %ax
449
	jbe cursor_ok
2703 jermar 450
		movw $1920, %ax				# sanity check for the cursor on the last line
2219 decky 451
	cursor_ok:
452
 
453
	movw %ax, %bx
454
	shl $1, %eax
455
	addl %eax, %edi
456
 
2703 jermar 457
	movw $0x0c00, %ax				# black background, light red foreground
2219 decky 458
 
459
	ploop:
460
		lodsb
461
		cmp $0, %al
462
		je ploop_end
463
		stosw
464
		inc %bx	
465
		jmp ploop
466
	ploop_end:
467
 
2703 jermar 468
	movw $0x3d4, %dx				# write bits 8 - 15 of the cursor address
2219 decky 469
	movb $0xe, %al
470
	outb %al, %dx
471
 
472
	movw $0x3d5, %dx
473
	movb %bh, %al
474
	outb %al, %dx
475
 
2703 jermar 476
	movw $0x3d4, %dx				# write bits 0 - 7 of the cursor address
2219 decky 477
	movb $0xf, %al
478
	outb %al, %dx
479
 
480
	movw $0x3d5, %dx
481
	movb %bl, %al
482
	outb %al, %dx
483
 
484
	cli
485
	hlt
206 palkovsky 486
 
2703 jermar 487
 
488
.section K_INI_PTLS, "aw", @progbits
489
 
490
#
491
# Macro for generating initial page table contents.
492
# @param cnt	Number of entries to generat. Must be multiple of 8.
493
# @param g	Number of GB that will be added to the mapping.
494
#
495
.macro ptl2gen cnt g 
496
.if \cnt
497
	ptl2gen "\cnt - 8" \g 
498
	.quad ((\cnt - 8) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
499
	.quad ((\cnt - 7) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
500
	.quad ((\cnt - 6) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
501
	.quad ((\cnt - 5) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
502
	.quad ((\cnt - 4) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
503
	.quad ((\cnt - 3) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
504
	.quad ((\cnt - 2) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
505
	.quad ((\cnt - 1) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
506
.endif
507
.endm
508
 
509
# Page table for pages in the first gigabyte.
164 palkovsky 510
.align 4096
2703 jermar 511
.global ptl_2_0g
512
ptl_2_0g:	
513
	ptl2gen 512 0
206 palkovsky 514
 
2703 jermar 515
# Page table for pages in the second gigabyte.
188 palkovsky 516
.align 4096
2703 jermar 517
.global ptl_2_1g
518
ptl_2_1g:
519
	ptl2gen 512 1
520
 
521
# Page table for pages in the third gigabyte.
522
.align 4096
523
.global ptl_2_2g
524
ptl_2_2g:
525
	ptl2gen 512 2
526
 
527
# Page table for pages in the fourth gigabyte.
528
.align 4096
529
.global ptl_2_3g
530
ptl_2_3g:
531
	ptl2gen 512 3
532
 
533
.align 4096
188 palkovsky 534
.global ptl_1
535
ptl_1:
2703 jermar 536
	# Identity mapping for [0; 4G)
537
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
538
	.quad ptl_2_1g + (PTL_WRITABLE | PTL_PRESENT) 
539
	.quad ptl_2_2g + (PTL_WRITABLE | PTL_PRESENT)
540
	.quad ptl_2_3g + (PTL_WRITABLE | PTL_PRESENT)
541
	.fill 506, 8, 0
542
	# Mapping of [0; 1G) at -2G
543
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
544
	.fill 1, 8, 0
188 palkovsky 545
 
546
.align 4096
547
.global ptl_0
548
ptl_0:
549
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 550
	.fill 255,8,0
188 palkovsky 551
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
1063 palkovsky 552
	.fill 254,8,0
553
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
178 palkovsky 554
 
2703 jermar 555
.section K_DATA_START, "aw", @progbits
556
 
695 decky 557
.global bootstrap_gdtr
558
bootstrap_gdtr:
685 decky 559
	.word gdtselector(GDT_ITEMS)
560
	.long KA2PA(gdt)
695 decky 561
 
562
grub_eax:
563
	.long 0
564
 
565
grub_ebx:
566
	.long 0
2219 decky 567
 
2692 decky 568
extended_cpuid_msg:
569
	.asciz "Extended CPUID not supported. System halted."
2219 decky 570
long_mode_msg:
2302 decky 571
	.asciz "64 bit long mode not supported. System halted."
2692 decky 572
noexecute_msg:
573
	.asciz "No-execute pages not supported. System halted."
574
fx_msg:
575
	.asciz "FXSAVE/FXRESTORE instructions not supported. System halted."
576
sse2_msg:
577
	.asciz "SSE2 instructions not supported. System halted."