Context Navigation

boot.S@ ab25d30

Visit:

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export

Last change on this file since ab25d30 was e13daa5d, checked in by Jakub Jermar <jakub@…>, 18 years ago
Fortify ia32 and amd64 kernels against mallicious uspace applications that set DF prior to entering the kernel. For AMD64 syscalls, we don't use the CLD instruction, but make use of the SFMASK MSR instead. Simics works fine with it, but QEMU seems to have a problem.
Property mode set to `100644`
File size: 10.8 KB

Line
1	#
2	# Copyright (c) 2001-2004 Jakub Jermar
3	# Copyright (c) 2005-2006 Martin Decky
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
30	#include <arch/boot/boot.h>
31	#include <arch/boot/memmap.h>
32	#include <arch/mm/page.h>
33	#include <arch/pm.h>
34
35	#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
36
37	.section K_TEXT_START, "ax"
38
39	.code32
40	.align 4
41	.global multiboot_image_start
42	multiboot_header:
43	.long MULTIBOOT_HEADER_MAGIC
44	.long MULTIBOOT_HEADER_FLAGS
45	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
46	.long multiboot_header
47	.long unmapped_ktext_start
48	.long 0
49	.long 0
50	.long multiboot_image_start
51
52	multiboot_image_start:
53	cld
54	movl $START_STACK, %esp # initialize stack pointer
55	lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register
56
57	movw $selector(KDATA_DES), %cx
58	movw %cx, %es
59	movw %cx, %fs
60	movw %cx, %gs
61	movw %cx, %ds # kernel data + stack
62	movw %cx, %ss
63
64	jmpl $selector(KTEXT_DES), $multiboot_meeting_point
65	multiboot_meeting_point:
66
67	movl %eax, grub_eax # save parameters from GRUB
68	movl %ebx, grub_ebx
69
70	xorl %eax, %eax
71	cpuid
72	cmp $0x0, %eax # any function > 0?
73	jbe pse_unsupported
74	movl $0x1, %eax # Basic function code 1
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
85	#ifdef CONFIG_FB
86	mov $vesa_init, %esi
87	mov $VESA_INIT_SEGMENT << 4, %edi
88	mov $e_vesa_init - vesa_init, %ecx
89	rep movsb
90
91	mov $VESA_INIT_SEGMENT << 4, %edi
92	jmpl *%edi
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)
103	#endif
104
105	call map_kernel # map kernel and turn paging on
106
107	movl grub_eax, %eax
108	movl grub_ebx, %ebx
109	cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature
110	je valid_boot
111
112	xorl %ecx, %ecx # no memory map available
113	movl %ecx, e820counter
114
115	jmp invalid_boot
116
117	valid_boot:
118
119	movl (%ebx), %eax # ebx = physical address of struct multiboot_info
120
121	bt $3, %eax # mbi->flags[3] (mods_count, mods_addr valid)
122	jc mods_valid
123
124	xorl %ecx, %ecx
125	movl %ecx, init
126	jmp mods_end
127
128	mods_valid:
129
130	movl 20(%ebx), %ecx # mbi->mods_count
131	movl %ecx, init
132
133	cmpl $0, %ecx
134	je mods_end
135
136	movl 24(%ebx), %esi # mbi->mods_addr
137	movl $init, %edi
138
139	mods_loop:
140
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
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
167
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
200	invalid_boot:
201
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	rep movsb
210
211	#endif
212
213	call main_bsp # never returns
214
215	cli
216	hlt
217
218	.global map_kernel
219	map_kernel:
220	#
221	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
222	# For simplicity, we map the entire 4G space.
223	#
224	movl %cr4, %ecx
225	orl $(1 << 4), %ecx # turn PSE on
226	andl $(~(1 << 5)), %ecx # turn PAE off
227	movl %ecx, %cr4
228
229	movl $(page_directory + 0), %esi
230	movl $(page_directory + 2048), %edi
231	xorl %ecx, %ecx
232	xorl %ebx, %ebx
233	0:
234	movl $((1 << 7) \| (1 << 1) \| (1 << 0)), %eax
235	orl %ebx, %eax
236	movl %eax, (%esi, %ecx, 4) # mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
237	movl %eax, (%edi, %ecx, 4) # mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
238	addl $(4 * 1024 * 1024), %ebx
239
240	incl %ecx
241	cmpl $512, %ecx
242	jl 0b
243
244	movl %esi, %cr3
245
246	movl %cr0, %ebx
247	orl $(1 << 31), %ebx # turn paging on
248	movl %ebx, %cr0
249	ret
250
251	# Print string from %esi to EGA display (in red) and halt
252	error_halt:
253	movl $0xb8000, %edi # base of EGA text mode memory
254	xorl %eax, %eax
255
256	movw $0x3d4, %dx # read bits 8 - 15 of the cursor address
257	movb $0xe, %al
258	outb %al, %dx
259
260	movw $0x3d5, %dx
261	inb %dx, %al
262	shl $8, %ax
263
264	movw $0x3d4, %dx # read bits 0 - 7 of the cursor address
265	movb $0xf, %al
266	outb %al, %dx
267
268	movw $0x3d5, %dx
269	inb %dx, %al
270
271	cmp $1920, %ax
272	jbe cursor_ok
273	movw $1920, %ax # sanity check for the cursor on the last line
274	cursor_ok:
275
276	movw %ax, %bx
277	shl $1, %eax
278	addl %eax, %edi
279
280	movw $0x0c00, %ax # black background, light red foreground
281
282	ploop:
283	lodsb
284	cmp $0, %al
285	je ploop_end
286	stosw
287	inc %bx
288	jmp ploop
289	ploop_end:
290
291	movw $0x3d4, %dx # write bits 8 - 15 of the cursor address
292	movb $0xe, %al
293	outb %al, %dx
294
295	movw $0x3d5, %dx
296	movb %bh, %al
297	outb %al, %dx
298
299	movw $0x3d4, %dx # write bits 0 - 7 of the cursor address
300	movb $0xf, %al
301	outb %al, %dx
302
303	movw $0x3d5, %dx
304	movb %bl, %al
305	outb %al, %dx
306
307	cli
308	hlt
309
310	#ifdef CONFIG_FB
311	vesa_init:
312	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
313
314	.code16
315	vesa_init_real:
316
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 %esp, %eax
334	movl $0x0000fffc, %esp
335	movl $0x0000fffc, %ebp
336	pushl %eax
337
338	#define VESA_INFO_SIZE 1024
339
340	#define VESA_MODE_ATTRIBUTES_OFFSET 0
341	#define VESA_MODE_LIST_PTR_OFFSET 14
342	#define VESA_MODE_SCANLINE_OFFSET 16
343	#define VESA_MODE_WIDTH_OFFSET 18
344	#define VESA_MODE_HEIGHT_OFFSET 20
345	#define VESA_MODE_BPP_OFFSET 25
346	#define VESA_MODE_PHADDR_OFFSET 40
347
348	#define VESA_END_OF_MODES 0xffff
349
350	#define VESA_OK 0x4f
351
352	#define VESA_GET_INFO 0x4f00
353	#define VESA_GET_MODE_INFO 0x4f01
354	#define VESA_SET_MODE 0x4f02
355	#define VESA_SET_PALETTE 0x4f09
356
357	#if CONFIG_VESA_BPP == 24
358	#define CONFIG_VESA_BPP_VARIANT 32
359	#endif
360
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
375
376	1:# Try next mode
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
405
406	#ifdef CONFIG_VESA_BPP_VARIANT
407	jz 2f
408
409	mov $CONFIG_VESA_BPP_VARIANT, %al
410	cmp VESA_MODE_BPP_OFFSET(%di), %al
411	#endif
412	jnz 1b
413
414	2:
415
416	mov %cx, %bx
417	or $0xc000, %bx
418	push %di
419	mov $VESA_SET_MODE, %ax
420	int $0x10
421
422	pop %di
423	cmp $VESA_OK, %al
424	jnz 0f
425
426	#if CONFIG_VESA_BPP == 8
427
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
435	bt $5, %ax # Test if VGA compatible registers are present
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
451	movw $0x3c6, %dx # Set palette mask
452	movb $0xff, %al
453	outb %al, %dx
454
455	movw $0x3c8, %dx # First index to set
456	xor %al, %al
457	outb %al, %dx
458
459	movw $0x3c9, %dx # Data port
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
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
496	9:
497
498	ljmpl $selector(KTEXT_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
512
513	1:
514	mov $0x0003, %ax
515	int $0x10
516	mov $0xffffffff, %edi # EGA text mode used, because of problems with VESA
517	xor %ax, %ax
518	jz 8b # Force relative jump
519
520	vga323:
521	#include "vga323.pal"
522
523	.code32
524	vesa_init_protect:
525	movw $selector(KDATA_DES), %cx
526	movw %cx, %es
527	movw %cx, %fs
528	movw %cx, %gs
529	movw %cx, %ds # kernel data + stack
530	movw %cx, %ss
531
532	movl $START_STACK, %esp # initialize stack pointer
533
534	jmpl $selector(KTEXT_DES), $vesa_meeting_point
535
536	.align 4
537	e_vesa_init:
538	#endif
539
540	.section K_DATA_START, "aw", @progbits
541
542	.align 4096
543	page_directory:
544	.space 4096, 0
545
546	grub_eax:
547	.long 0
548
549	grub_ebx:
550	.long 0
551
552	pse_msg:
553	.asciz "Page Size Extension not supported. System halted."

Note: See TracBrowser for help on using the repository browser.

Download in other formats:

Original Format