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1 jermar 1
#
2071 jermar 2
# Copyright (c) 2001-2004 Jakub Jermar
3
# Copyright (c) 2005-2006 Martin Decky
1 jermar 4
# All rights reserved.
5
#
6
# Redistribution and use in source and binary forms, with or without
7
# modification, are permitted provided that the following conditions
8
# are met:
9
#
10
# - Redistributions of source code must retain the above copyright
11
#   notice, this list of conditions and the following disclaimer.
12
# - Redistributions in binary form must reproduce the above copyright
13
#   notice, this list of conditions and the following disclaimer in the
14
#   documentation and/or other materials provided with the distribution.
15
# - The name of the author may not be used to endorse or promote products
16
#   derived from this software without specific prior written permission.
17
#
18
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
#
29
 
222 decky 30
#include <arch/boot/boot.h>
506 decky 31
#include <arch/boot/memmap.h>
300 palkovsky 32
#include <arch/mm/page.h>
33
#include <arch/pm.h>
222 decky 34
 
693 decky 35
#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
36
 
406 jermar 37
.section K_TEXT_START, "ax"
1 jermar 38
 
112 jermar 39
.code32
222 decky 40
.align 4
693 decky 41
.global multiboot_image_start
222 decky 42
multiboot_header:
43
	.long MULTIBOOT_HEADER_MAGIC
44
	.long MULTIBOOT_HEADER_FLAGS
45
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
693 decky 46
	.long multiboot_header
47
	.long unmapped_ktext_start
222 decky 48
	.long 0
49
	.long 0
693 decky 50
	.long multiboot_image_start
222 decky 51
 
52
multiboot_image_start:
693 decky 53
	movl $START_STACK, %esp			# initialize stack pointer
54
	lgdt KA2PA(bootstrap_gdtr)		# initialize Global Descriptor Table register
112 jermar 55
 
1811 decky 56
	movw $selector(KDATA_DES), %cx
280 decky 57
	movw %cx, %es
1639 decky 58
	movw %cx, %fs
280 decky 59
	movw %cx, %gs
693 decky 60
	movw %cx, %ds					# kernel data + stack
280 decky 61
	movw %cx, %ss
235 decky 62
 
1811 decky 63
	jmpl $selector(KTEXT_DES), $multiboot_meeting_point
271 decky 64
	multiboot_meeting_point:
65
 
2222 decky 66
	movl %eax, grub_eax					# save parameters from GRUB
67
	movl %ebx, grub_ebx
1639 decky 68
 
2220 decky 69
	xorl %eax, %eax  
70
 	cpuid
71
 	cmp $0x0, %eax						# any function > 0?
72
	jbe pse_unsupported
2221 decky 73
	movl $0x1, %eax						# Basic function code 1
2220 decky 74
	cpuid
75
	bt $3, %edx							# Test if PSE is supported
76
	jc pse_supported
77
 
78
	pse_unsupported:
79
		movl $pse_msg, %esi
80
		jmp error_halt
81
 
82
	pse_supported:
83
 
1287 vana 84
#ifdef CONFIG_FB
1639 decky 85
	mov $vesa_init, %esi
86
	mov $VESA_INIT_SEGMENT << 4, %edi
87
	mov $e_vesa_init - vesa_init, %ecx
88
	cld
89
	rep movsb
1287 vana 90
 
1639 decky 91
	mov $VESA_INIT_SEGMENT << 4, %edi
2089 decky 92
	jmpl *%edi
1639 decky 93
 
94
	vesa_meeting_point:
95
 
96
	mov %esi, KA2PA(vesa_ph_addr)
97
	mov %di, KA2PA(vesa_height)
98
	shr $16, %edi
99
	mov %di, KA2PA(vesa_width)
100
	mov %bx, KA2PA(vesa_scanline)
101
	shr $16, %ebx
102
	mov %bx, KA2PA(vesa_bpp)
1287 vana 103
#endif	
280 decky 104
 
323 jermar 105
	call map_kernel							# map kernel and turn paging on
235 decky 106
 
2222 decky 107
	movl grub_eax, %eax
108
	movl grub_ebx, %ebx
323 jermar 109
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
280 decky 110
	je valid_boot
111
 
2725 decky 112
		xorl %ecx, %ecx							# no memory map available
285 decky 113
		movl %ecx, e820counter
114
 
280 decky 115
		jmp invalid_boot
285 decky 116
 
280 decky 117
	valid_boot:
118
 
285 decky 119
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
280 decky 120
 
1037 decky 121
		bt $3, %eax								# mbi->flags[3] (mods_count, mods_addr valid)
506 decky 122
		jc mods_valid
123
 
124
			xorl %ecx, %ecx
1037 decky 125
			movl %ecx, init
126
			jmp mods_end
506 decky 127
 
128
		mods_valid:
1037 decky 129
 
628 decky 130
		movl 20(%ebx), %ecx						# mbi->mods_count
1037 decky 131
		movl %ecx, init
132
 
628 decky 133
		cmpl $0, %ecx
1037 decky 134
		je mods_end
506 decky 135
 
628 decky 136
		movl 24(%ebx), %esi						# mbi->mods_addr
1037 decky 137
		movl $init, %edi
628 decky 138
 
1037 decky 139
		mods_loop:
506 decky 140
 
1037 decky 141
			movl 0(%esi), %edx					# mods->mod_start
142
			addl $0x80000000, %edx
143
			movl %edx, 4(%edi)
144
 
145
			movl 4(%esi), %edx
146
			subl 0(%esi), %edx					# mods->mod_end - mods->mod_start
147
			movl %edx, 8(%edi)
148
 
149
			addl $16, %esi
150
			addl $8	, %edi
151
 
152
			loop mods_loop
153
 
154
		mods_end:
155
 
285 decky 156
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
157
		jc mmap_valid
158
 
159
			xorl %edx, %edx
160
			jmp mmap_invalid
161
 
162
		mmap_valid:
163
		movl 44(%ebx), %ecx						# mbi->mmap_length
164
		movl 48(%ebx), %esi						# mbi->mmap_addr
165
		movl $e820table, %edi
166
		xorl %edx, %edx
280 decky 167
 
285 decky 168
		mmap_loop:
169
			cmpl $0, %ecx
170
			jle mmap_end
171
 
172
			movl 4(%esi), %eax					# mmap->base_addr_low
173
			movl %eax, (%edi)
174
 
175
			movl 8(%esi), %eax					# mmap->base_addr_high
176
			movl %eax, 4(%edi)
177
 
178
			movl 12(%esi), %eax					# mmap->length_low
179
			movl %eax, 8(%edi)
180
 
181
			movl 16(%esi), %eax					# mmap->length_high
182
			movl %eax, 12(%edi)
183
 
184
			movl 20(%esi), %eax					# mmap->type
185
			movl %eax, 16(%edi)
186
 
187
			movl (%esi), %eax					# mmap->size
188
			addl $0x4, %eax
189
			addl %eax, %esi
190
			subl %eax, %ecx
191
			addl $MEMMAP_E820_RECORD_SIZE, %edi
192
			incl %edx
193
			jmp mmap_loop
194
 
195
		mmap_end:
196
 
197
		mmap_invalid:
198
		movl %edx, e820counter
199
 
280 decky 200
	invalid_boot:
201
 
693 decky 202
#ifdef CONFIG_SMP
203
 
204
	# copy AP bootstrap routines below 1 MB
205
 
206
	movl $BOOT_OFFSET, %esi
207
	movl $AP_BOOT_OFFSET, %edi
208
	movl $_hardcoded_unmapped_size, %ecx
209
	cld
210
	rep movsb
211
 
212
#endif
2220 decky 213
 
693 decky 214
	call main_bsp								# never returns
110 jermar 215
 
216
	cli
217
	hlt
218
 
219
.global map_kernel
220
map_kernel:
105 jermar 221
	#
222
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 223
	# For simplicity, we map the entire 4G space.
105 jermar 224
	#
225
	movl %cr4, %ecx
2220 decky 226
	orl $(1 << 4), %ecx							# turn PSE on
227
	andl $(~(1 << 5)), %ecx						# turn PAE off
228
	movl %ecx, %cr4
1 jermar 229
 
2220 decky 230
	movl $(page_directory + 0), %esi
231
	movl $(page_directory + 2048), %edi
371 jermar 232
	xorl %ecx, %ecx
233
	xorl %ebx, %ebx
234
0:
2220 decky 235
	movl $((1 << 7) | (1 << 1) | (1 << 0)), %eax
371 jermar 236
	orl %ebx, %eax
2220 decky 237
	movl %eax, (%esi, %ecx, 4)					# mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
238
	movl %eax, (%edi, %ecx, 4)					# mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
239
	addl $(4 * 1024 * 1024), %ebx
1 jermar 240
 
371 jermar 241
	incl %ecx
242
	cmpl $512, %ecx
243
	jl 0b
105 jermar 244
 
371 jermar 245
	movl %esi, %cr3
105 jermar 246
 
247
	movl %cr0, %ebx
2220 decky 248
	orl $(1 << 31), %ebx						# turn paging on
105 jermar 249
	movl %ebx, %cr0
110 jermar 250
	ret
105 jermar 251
 
2220 decky 252
# Print string from %esi to EGA display (in red) and halt
253
error_halt:
254
	movl $0xb8000, %edi						# base of EGA text mode memory
255
	xorl %eax, %eax
256
 
257
	movw $0x3d4, %dx						# read bits 8 - 15 of the cursor address
258
	movb $0xe, %al
259
	outb %al, %dx
260
 
261
	movw $0x3d5, %dx
262
	inb %dx, %al
263
	shl $8, %ax
264
 
265
	movw $0x3d4, %dx						# read bits 0 - 7 of the cursor address
266
	movb $0xf, %al
267
	outb %al, %dx
268
 
269
	movw $0x3d5, %dx
270
	inb %dx, %al
271
 
272
	cmp $1920, %ax
273
	jbe cursor_ok
274
		movw $1920, %ax						# sanity check for the cursor on the last line
275
	cursor_ok:
276
 
277
	movw %ax, %bx
278
	shl $1, %eax
279
	addl %eax, %edi
280
 
281
	movw $0x0c00, %ax						# black background, light red foreground
282
	cld
283
 
284
	ploop:
285
		lodsb
286
		cmp $0, %al
287
		je ploop_end
288
		stosw
289
		inc %bx	
290
		jmp ploop
291
	ploop_end:
292
 
293
	movw $0x3d4, %dx						# write bits 8 - 15 of the cursor address
294
	movb $0xe, %al
295
	outb %al, %dx
296
 
297
	movw $0x3d5, %dx
298
	movb %bh, %al
299
	outb %al, %dx
300
 
301
	movw $0x3d4, %dx						# write bits 0 - 7 of the cursor address
302
	movb $0xf, %al
303
	outb %al, %dx
304
 
305
	movw $0x3d5, %dx
306
	movb %bl, %al
307
	outb %al, %dx
308
 
309
	cli
310
	hlt
311
 
1287 vana 312
#ifdef CONFIG_FB
313
vesa_init:
1639 decky 314
	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
315
 
1287 vana 316
.code16
1639 decky 317
vesa_init_real:
1287 vana 318
 
1639 decky 319
	mov %cr0, %eax
320
	and $~1, %eax
321
	mov %eax, %cr0
322
 
323
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
324
 
325
vesa_init_real2:
326
 
327
	mov $VESA_INIT_SEGMENT, %bx
328
 
329
	mov %bx, %es
330
	mov %bx, %fs
331
	mov %bx, %gs
332
	mov %bx, %ds
333
	mov %bx, %ss
334
 
335
	movl %esp, %eax
336
	movl $0x0000fffc, %esp
337
	movl $0x0000fffc, %ebp
338
	pushl %eax
339
 
1287 vana 340
#define VESA_INFO_SIZE 1024
341
 
2302 decky 342
#define VESA_MODE_ATTRIBUTES_OFFSET 0
1639 decky 343
#define VESA_MODE_LIST_PTR_OFFSET 14
2302 decky 344
#define VESA_MODE_SCANLINE_OFFSET 16
1287 vana 345
#define VESA_MODE_WIDTH_OFFSET 18
346
#define VESA_MODE_HEIGHT_OFFSET 20
347
#define VESA_MODE_BPP_OFFSET 25
348
#define VESA_MODE_PHADDR_OFFSET 40
349
 
1639 decky 350
#define VESA_END_OF_MODES 0xffff
1287 vana 351
 
1639 decky 352
#define VESA_OK 0x4f
1287 vana 353
 
1639 decky 354
#define VESA_GET_INFO 0x4f00
1287 vana 355
#define VESA_GET_MODE_INFO 0x4f01
356
#define VESA_SET_MODE 0x4f02
2302 decky 357
#define VESA_SET_PALETTE 0x4f09
1287 vana 358
 
1639 decky 359
#if CONFIG_VESA_BPP == 24
2302 decky 360
#define CONFIG_VESA_BPP_VARIANT 32
1287 vana 361
#endif
362
 
1639 decky 363
	mov $VESA_GET_INFO, %ax
364
	mov $e_vesa_init - vesa_init, %di
365
	push %di
366
	int $0x10
367
 
368
	pop %di
369
	cmp $VESA_OK, %al
370
	jnz 0f
371
 
372
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
373
	mov %si, %gs
374
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
375
 
376
	add $VESA_INFO_SIZE, %di
1287 vana 377
 
378
1:# Try next mode
1639 decky 379
	mov %gs:(%si), %cx
380
	cmp $VESA_END_OF_MODES, %cx
381
	jz 0f
382
 
383
	inc %si
384
	inc %si
385
	push %cx
386
	push %di
387
	push %si
388
	mov $VESA_GET_MODE_INFO, %ax
389
	int $0x10
390
 
391
	pop %si
392
	pop %di
393
	pop %cx
394
	cmp $VESA_OK, %al
395
	jnz 0f
396
 
397
	mov $CONFIG_VESA_WIDTH, %ax
398
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
399
	jnz 1b
400
 
2302 decky 401
	mov $CONFIG_VESA_HEIGHT, %ax
1639 decky 402
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
403
	jnz 1b
404
 
405
	mov $CONFIG_VESA_BPP, %al
406
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 407
 
408
#ifdef CONFIG_VESA_BPP_VARIANT
1639 decky 409
	jz 2f
410
 
2302 decky 411
	mov $CONFIG_VESA_BPP_VARIANT, %al
1639 decky 412
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 413
#endif
1639 decky 414
	jnz 1b
2302 decky 415
 
1287 vana 416
2:
417
 
1639 decky 418
	mov %cx, %bx
419
	or $0xc000, %bx
420
	push %di
421
	mov $VESA_SET_MODE, %ax
422
	int $0x10
1287 vana 423
 
1639 decky 424
	pop %di
425
	cmp $VESA_OK, %al
426
	jnz 0f
2302 decky 427
 
428
#if CONFIG_VESA_BPP == 8
1287 vana 429
 
2302 decky 430
	# Set 3:2:3 VGA palette
431
 
432
	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
433
	push %di
434
	mov $vga323 - vesa_init, %di
435
	mov $0x100, %ecx
436
 
437
	bt $5, %ax							# Test if VGA compatible registers are present
438
	jnc vga_compat
439
 
440
		# Try VESA routine to set palette
441
 
442
		mov $VESA_SET_PALETTE, %ax
443
		xor %bl, %bl
444
		xor %dx, %dx
445
		int $0x10
446
 
447
		jmp vga_not_compat
448
 
449
	vga_compat:
450
 
451
		# Try VGA registers to set palette
452
 
453
		movw $0x3c6, %dx						# Set palette mask
454
		movb $0xff, %al
455
		outb %al, %dx
456
 
457
		movw $0x3c8, %dx						# First index to set
458
		xor %al, %al
459
		outb %al, %dx
460
 
461
		movw $0x3c9, %dx						# Data port
462
		vga_loop:
463
			movb %es:2(%di), %al
464
			outb %al, %dx
465
 
466
			movb %es:1(%di), %al
467
			outb %al, %dx
468
 
469
			movb %es:(%di), %al
470
			outb %al, %dx
471
 
472
			addw $4, %di
473
			loop vga_loop
474
 
475
	vga_not_compat:
476
 
477
	pop %di
478
 
479
#endif
480
 
1639 decky 481
	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
482
	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
483
	shl $16, %eax
484
	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
485
	mov VESA_MODE_BPP_OFFSET(%di), %bl
486
	xor %bh, %bh
487
	shl $16, %ebx
488
	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
489
	mov %eax, %edi
490
 
1287 vana 491
8:	
1639 decky 492
 
493
	mov %cr0, %eax
494
	or $1, %eax
1641 decky 495
	mov %eax, %cr0
1639 decky 496
 
497
	jmp 9f
1287 vana 498
9:
1639 decky 499
 
1811 decky 500
	ljmpl $selector(KTEXT_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
1287 vana 501
 
1639 decky 502
0:# No prefered mode found
503
	mov $0x111, %cx
504
	push %di
505
	push %cx
506
	mov $VESA_GET_MODE_INFO, %ax
507
	int $0x10
508
 
509
	pop %cx
510
	pop %di
511
	cmp $VESA_OK, %al
512
	jnz 1f
513
	jz 2b						# Force relative jump
514
 
515
1:
516
	mov $0x0003, %ax
517
	int $0x10
518
	mov $0xffffffff, %edi		# EGA text mode used, because of problems with VESA
519
	xor %ax, %ax
520
	jz 8b						# Force relative jump
1287 vana 521
 
2302 decky 522
vga323:
523
#include "vga323.pal"
524
 
1639 decky 525
.code32
526
vesa_init_protect:
1811 decky 527
	movw $selector(KDATA_DES), %cx
1639 decky 528
	movw %cx, %es
529
	movw %cx, %fs
530
	movw %cx, %gs
531
	movw %cx, %ds					# kernel data + stack
532
	movw %cx, %ss
533
 
2222 decky 534
	movl $START_STACK, %esp			# initialize stack pointer
535
 
1811 decky 536
	jmpl $selector(KTEXT_DES), $vesa_meeting_point
1287 vana 537
 
538
.align 4
539
e_vesa_init:
540
#endif	
541
 
406 jermar 542
.section K_DATA_START, "aw", @progbits
105 jermar 543
 
544
.align 4096
545
page_directory:
546
	.space 4096, 0
2220 decky 547
 
2222 decky 548
grub_eax:
549
	.long 0
550
 
551
grub_ebx:
552
	.long 0
553
 
2220 decky 554
pse_msg:
2302 decky 555
	.asciz "Page Size Extension not supported. System halted."