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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:
2784 jermar 53
	cld
693 decky 54
	movl $START_STACK, %esp			# initialize stack pointer
55
	lgdt KA2PA(bootstrap_gdtr)		# initialize Global Descriptor Table register
112 jermar 56
 
1811 decky 57
	movw $selector(KDATA_DES), %cx
280 decky 58
	movw %cx, %es
1639 decky 59
	movw %cx, %fs
280 decky 60
	movw %cx, %gs
693 decky 61
	movw %cx, %ds					# kernel data + stack
280 decky 62
	movw %cx, %ss
235 decky 63
 
1811 decky 64
	jmpl $selector(KTEXT_DES), $multiboot_meeting_point
271 decky 65
	multiboot_meeting_point:
66
 
2222 decky 67
	movl %eax, grub_eax					# save parameters from GRUB
68
	movl %ebx, grub_ebx
1639 decky 69
 
2220 decky 70
	xorl %eax, %eax  
71
 	cpuid
72
 	cmp $0x0, %eax						# any function > 0?
73
	jbe pse_unsupported
2221 decky 74
	movl $0x1, %eax						# Basic function code 1
2220 decky 75
	cpuid
76
	bt $3, %edx							# Test if PSE is supported
77
	jc pse_supported
78
 
79
	pse_unsupported:
80
		movl $pse_msg, %esi
81
		jmp error_halt
82
 
83
	pse_supported:
84
 
1287 vana 85
#ifdef CONFIG_FB
1639 decky 86
	mov $vesa_init, %esi
87
	mov $VESA_INIT_SEGMENT << 4, %edi
88
	mov $e_vesa_init - vesa_init, %ecx
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	
3984 svoboda 104
 
323 jermar 105
	call map_kernel							# map kernel and turn paging on
3984 svoboda 106
 
3985 svoboda 107
	# ia32_cboot(grub_eax, grub_ebx)
108
	pushl grub_ebx
109
	pushl grub_eax
3984 svoboda 110
	call ia32_cboot		# Does not return.
111
 
112
	# Not reached.
113
 
110 jermar 114
	cli
115
	hlt
116
 
117
.global map_kernel
118
map_kernel:
105 jermar 119
	#
120
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 121
	# For simplicity, we map the entire 4G space.
105 jermar 122
	#
123
	movl %cr4, %ecx
2220 decky 124
	orl $(1 << 4), %ecx							# turn PSE on
125
	andl $(~(1 << 5)), %ecx						# turn PAE off
126
	movl %ecx, %cr4
1 jermar 127
 
2220 decky 128
	movl $(page_directory + 0), %esi
129
	movl $(page_directory + 2048), %edi
371 jermar 130
	xorl %ecx, %ecx
131
	xorl %ebx, %ebx
132
0:
2220 decky 133
	movl $((1 << 7) | (1 << 1) | (1 << 0)), %eax
371 jermar 134
	orl %ebx, %eax
2220 decky 135
	movl %eax, (%esi, %ecx, 4)					# mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
136
	movl %eax, (%edi, %ecx, 4)					# mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
137
	addl $(4 * 1024 * 1024), %ebx
1 jermar 138
 
371 jermar 139
	incl %ecx
140
	cmpl $512, %ecx
141
	jl 0b
105 jermar 142
 
371 jermar 143
	movl %esi, %cr3
105 jermar 144
 
145
	movl %cr0, %ebx
2220 decky 146
	orl $(1 << 31), %ebx						# turn paging on
105 jermar 147
	movl %ebx, %cr0
110 jermar 148
	ret
105 jermar 149
 
2220 decky 150
# Print string from %esi to EGA display (in red) and halt
151
error_halt:
152
	movl $0xb8000, %edi						# base of EGA text mode memory
153
	xorl %eax, %eax
154
 
155
	movw $0x3d4, %dx						# read bits 8 - 15 of the cursor address
156
	movb $0xe, %al
157
	outb %al, %dx
158
 
159
	movw $0x3d5, %dx
160
	inb %dx, %al
161
	shl $8, %ax
162
 
163
	movw $0x3d4, %dx						# read bits 0 - 7 of the cursor address
164
	movb $0xf, %al
165
	outb %al, %dx
166
 
167
	movw $0x3d5, %dx
168
	inb %dx, %al
169
 
170
	cmp $1920, %ax
171
	jbe cursor_ok
172
		movw $1920, %ax						# sanity check for the cursor on the last line
173
	cursor_ok:
174
 
175
	movw %ax, %bx
176
	shl $1, %eax
177
	addl %eax, %edi
178
 
179
	movw $0x0c00, %ax						# black background, light red foreground
180
 
181
	ploop:
182
		lodsb
183
		cmp $0, %al
184
		je ploop_end
185
		stosw
186
		inc %bx	
187
		jmp ploop
188
	ploop_end:
189
 
190
	movw $0x3d4, %dx						# write bits 8 - 15 of the cursor address
191
	movb $0xe, %al
192
	outb %al, %dx
193
 
194
	movw $0x3d5, %dx
195
	movb %bh, %al
196
	outb %al, %dx
197
 
198
	movw $0x3d4, %dx						# write bits 0 - 7 of the cursor address
199
	movb $0xf, %al
200
	outb %al, %dx
201
 
202
	movw $0x3d5, %dx
203
	movb %bl, %al
204
	outb %al, %dx
205
 
206
	cli
207
	hlt
208
 
1287 vana 209
#ifdef CONFIG_FB
210
vesa_init:
1639 decky 211
	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
212
 
1287 vana 213
.code16
1639 decky 214
vesa_init_real:
1287 vana 215
 
1639 decky 216
	mov %cr0, %eax
217
	and $~1, %eax
218
	mov %eax, %cr0
219
 
220
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
221
 
222
vesa_init_real2:
223
 
224
	mov $VESA_INIT_SEGMENT, %bx
225
 
226
	mov %bx, %es
227
	mov %bx, %fs
228
	mov %bx, %gs
229
	mov %bx, %ds
230
	mov %bx, %ss
231
 
232
	movl %esp, %eax
233
	movl $0x0000fffc, %esp
234
	movl $0x0000fffc, %ebp
235
	pushl %eax
236
 
1287 vana 237
#define VESA_INFO_SIZE 1024
238
 
2302 decky 239
#define VESA_MODE_ATTRIBUTES_OFFSET 0
1639 decky 240
#define VESA_MODE_LIST_PTR_OFFSET 14
2302 decky 241
#define VESA_MODE_SCANLINE_OFFSET 16
1287 vana 242
#define VESA_MODE_WIDTH_OFFSET 18
243
#define VESA_MODE_HEIGHT_OFFSET 20
244
#define VESA_MODE_BPP_OFFSET 25
245
#define VESA_MODE_PHADDR_OFFSET 40
246
 
1639 decky 247
#define VESA_END_OF_MODES 0xffff
1287 vana 248
 
1639 decky 249
#define VESA_OK 0x4f
1287 vana 250
 
1639 decky 251
#define VESA_GET_INFO 0x4f00
1287 vana 252
#define VESA_GET_MODE_INFO 0x4f01
253
#define VESA_SET_MODE 0x4f02
2302 decky 254
#define VESA_SET_PALETTE 0x4f09
1287 vana 255
 
1639 decky 256
#if CONFIG_VESA_BPP == 24
2302 decky 257
#define CONFIG_VESA_BPP_VARIANT 32
1287 vana 258
#endif
259
 
1639 decky 260
	mov $VESA_GET_INFO, %ax
261
	mov $e_vesa_init - vesa_init, %di
262
	push %di
263
	int $0x10
264
 
265
	pop %di
266
	cmp $VESA_OK, %al
267
	jnz 0f
268
 
269
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
270
	mov %si, %gs
271
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
272
 
273
	add $VESA_INFO_SIZE, %di
1287 vana 274
 
275
1:# Try next mode
1639 decky 276
	mov %gs:(%si), %cx
277
	cmp $VESA_END_OF_MODES, %cx
278
	jz 0f
279
 
280
	inc %si
281
	inc %si
282
	push %cx
283
	push %di
284
	push %si
285
	mov $VESA_GET_MODE_INFO, %ax
286
	int $0x10
287
 
288
	pop %si
289
	pop %di
290
	pop %cx
291
	cmp $VESA_OK, %al
292
	jnz 0f
293
 
294
	mov $CONFIG_VESA_WIDTH, %ax
295
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
296
	jnz 1b
297
 
2302 decky 298
	mov $CONFIG_VESA_HEIGHT, %ax
1639 decky 299
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
300
	jnz 1b
301
 
302
	mov $CONFIG_VESA_BPP, %al
303
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 304
 
305
#ifdef CONFIG_VESA_BPP_VARIANT
1639 decky 306
	jz 2f
307
 
2302 decky 308
	mov $CONFIG_VESA_BPP_VARIANT, %al
1639 decky 309
	cmp VESA_MODE_BPP_OFFSET(%di), %al
2302 decky 310
#endif
1639 decky 311
	jnz 1b
2302 decky 312
 
1287 vana 313
2:
314
 
1639 decky 315
	mov %cx, %bx
316
	or $0xc000, %bx
317
	push %di
318
	mov $VESA_SET_MODE, %ax
319
	int $0x10
1287 vana 320
 
1639 decky 321
	pop %di
322
	cmp $VESA_OK, %al
323
	jnz 0f
2302 decky 324
 
325
#if CONFIG_VESA_BPP == 8
1287 vana 326
 
2302 decky 327
	# Set 3:2:3 VGA palette
328
 
329
	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
330
	push %di
331
	mov $vga323 - vesa_init, %di
332
	mov $0x100, %ecx
333
 
334
	bt $5, %ax							# Test if VGA compatible registers are present
335
	jnc vga_compat
336
 
337
		# Try VESA routine to set palette
338
 
339
		mov $VESA_SET_PALETTE, %ax
340
		xor %bl, %bl
341
		xor %dx, %dx
342
		int $0x10
343
 
3802 decky 344
		cmp $0x00, %ah
345
		je vga_not_compat
2302 decky 346
 
347
	vga_compat:
348
 
349
		# Try VGA registers to set palette
350
 
351
		movw $0x3c6, %dx						# Set palette mask
352
		movb $0xff, %al
353
		outb %al, %dx
354
 
355
		movw $0x3c8, %dx						# First index to set
356
		xor %al, %al
357
		outb %al, %dx
358
 
359
		movw $0x3c9, %dx						# Data port
360
		vga_loop:
361
			movb %es:2(%di), %al
362
			outb %al, %dx
363
 
364
			movb %es:1(%di), %al
365
			outb %al, %dx
366
 
367
			movb %es:(%di), %al
368
			outb %al, %dx
369
 
370
			addw $4, %di
371
			loop vga_loop
372
 
373
	vga_not_compat:
374
 
375
	pop %di
376
 
377
#endif
378
 
1639 decky 379
	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
380
	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
381
	shl $16, %eax
382
	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
383
	mov VESA_MODE_BPP_OFFSET(%di), %bl
384
	xor %bh, %bh
385
	shl $16, %ebx
386
	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
387
	mov %eax, %edi
388
 
1287 vana 389
8:	
1639 decky 390
 
391
	mov %cr0, %eax
392
	or $1, %eax
1641 decky 393
	mov %eax, %cr0
1639 decky 394
 
395
	jmp 9f
1287 vana 396
9:
1639 decky 397
 
1811 decky 398
	ljmpl $selector(KTEXT_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
1287 vana 399
 
1639 decky 400
0:# No prefered mode found
401
	mov $0x111, %cx
402
	push %di
403
	push %cx
404
	mov $VESA_GET_MODE_INFO, %ax
405
	int $0x10
406
 
407
	pop %cx
408
	pop %di
409
	cmp $VESA_OK, %al
410
	jnz 1f
411
	jz 2b						# Force relative jump
412
 
413
1:
414
	mov $0x0003, %ax
415
	int $0x10
416
	mov $0xffffffff, %edi		# EGA text mode used, because of problems with VESA
417
	xor %ax, %ax
418
	jz 8b						# Force relative jump
1287 vana 419
 
2302 decky 420
vga323:
421
#include "vga323.pal"
422
 
1639 decky 423
.code32
424
vesa_init_protect:
1811 decky 425
	movw $selector(KDATA_DES), %cx
1639 decky 426
	movw %cx, %es
427
	movw %cx, %fs
428
	movw %cx, %gs
429
	movw %cx, %ds					# kernel data + stack
430
	movw %cx, %ss
431
 
2222 decky 432
	movl $START_STACK, %esp			# initialize stack pointer
433
 
1811 decky 434
	jmpl $selector(KTEXT_DES), $vesa_meeting_point
1287 vana 435
 
436
.align 4
437
e_vesa_init:
438
#endif	
439
 
406 jermar 440
.section K_DATA_START, "aw", @progbits
105 jermar 441
 
442
.align 4096
443
page_directory:
444
	.space 4096, 0
2220 decky 445
 
2222 decky 446
grub_eax:
447
	.long 0
448
 
449
grub_ebx:
450
	.long 0
451
 
2220 decky 452
pse_msg:
2302 decky 453
	.asciz "Page Size Extension not supported. System halted."